CN1983882B - Radio-frequency front, system and method for measuring antenna feedback voltage resident wave ratio - Google Patents

Abstract

The invention discloses a radio frequency front end of a base station, which includes a power channel and a powerless channel. The radio frequency front end of the base station further includes: a cross-channel directional coupler, which is used to couple a part of the forward power of the power channel to the non-power channel. One end is located next to the forward power transmission line of the power channel, and the other end is connected to the forward power input interface of the non-power channel. The invention also discloses a system and a method for measuring the standing wave ratio of an antenna feeder by using the base station radio frequency front end. By adopting the technical scheme disclosed in the present invention, the measurement of the VSWR of the antenna feeder corresponding to the channel without forward power input can be realized. At the same time, the influence on the coverage performance of the base station with the power channel is very small, and the normal operation of the power channel is not affected.

Description

A radio frequency front end and a system and method for measuring antenna feeder voltage standing wave ratio by using it

technical field

The present invention relates to mobile communication technology, in particular to a radio frequency front end of a base station, and a system and method for measuring the voltage standing wave ratio (VSWR, Voltage Standing Wave Ratio) of a base station antenna by using the radio frequency of the base station. the

Background technique

VSWR is an important performance index of the antenna feeder part of the mobile communication base station system. In order to measure the VSWR of the antenna feeder, it is necessary to measure the forward power and reverse power of the antenna feeder. A typical system for measuring the VSWR of an antenna feeder is shown in Figure 1. the

The system is divided into two parts: base station radio frequency front end and measurement board. The radio frequency front end of the base station has a common duplex channel for sending and receiving. When the radio frequency front end of the base station is working, the transmitted signal passes through a low-pass filter and a duplexer, and is output to the antenna feeder interface, and further enters the base station antenna feeder. The transmit signal output from the duplexer is not only output to the antenna feeder interface, but also coupled to the forward power measurement interface by the first directional coupler, and further output to the measurement board as forward power. The transmitted signal entering the antenna feeder of the base station through the antenna feeder interface is reflected in the antenna feeder, and the reflected signal enters the radio frequency front end of the base station from the antenna feeder interface. Part of the reflected signal is coupled to the reverse power measurement interface by the second directional coupler, and is further output to the measurement board as reverse power, and the other part is filtered by the duplexer. The measurement module of the measurement board measures the forward power and reverse power respectively; then the calculation module combines the coupling degree of the first directional coupler and the second directional coupler to calculate the VSWR of the antenna feeder; finally, the calculation result is passed through the result output module output. the

As mentioned above, in order to measure the VSWR of the antenna feeder, the channel corresponding to the antenna feeder needs to have input forward power, and the input forward power is reflected in the antenna feeder to generate reverse power, and then the VSWR can be calculated according to the forward and reverse power . However, in practical applications, the channel corresponding to the antenna feeder does not always have positive power input. For example, as shown in Figure 2, the radio frequency front end of the base station has two duplex channels, but only one of them is put into use, that is to say, only one of the duplex channels has input forward power, so that the other cannot Perform VSWR measurement on the antenna feeder corresponding to the duplex channel. For another example, as shown in Figure 3, the radio frequency front end of the base station has a duplex channel and a diversity receive channel, and the transmitted signal is used as the input forward power of the duplex channel, but the diversity receive channel has no forward power input, so it cannot be used for diversity Perform VSWR measurement on the antenna feeder corresponding to the receiving channel. the

Contents of the invention

In view of this, the main purpose of the present invention is to provide a base station radio frequency front end and a system and method for measuring base station antenna feeder VSWR by using the base station radio frequency front end, and the antenna feeder corresponding to the channel without forward power input in the base station radio frequency front end is also Ability to measure VSWR. the

In order to achieve the above object, the present invention provides a radio frequency front end of a base station, including a power channel and a powerless channel, characterized in that the radio frequency front end of the base station further includes:

The cross-channel directional coupler is used to couple a part of the forward power of the power channel to the non-power channel, one end of which is located next to the forward power transmission line of the power channel, and the other end is connected to the forward power input interface of the non-power channel;

The channel with power is a channel with input forward power; the channel with no power is a channel without input forward power. the

Wherein, the power channel includes the first duplexer and the first antenna feeder interface, and the forward power transmission line of the power channel is:

a transmission line connected to the transmit interface of the first duplexer;

or

The transmission line between the combiner end of the first duplexer and the first antenna feeder interface. the

Wherein, the non-power channel includes a second duplexer and a second feeder interface, one end of the cross-channel directional coupler is located next to the forward power transmission line of the power channel, and the other end is connected to the second duplexer launch interface. the

Wherein, the non-power channel includes a receiving filter and a second-day feeder interface, and the radio frequency front end of the base station further includes:

Transmit filter, the passband is the transmit frequency band of the base station system, one end of which is connected to the cross-channel directional coupler, and the other end is connected to the second-day feeder interface;

One end of the cross-channel directional coupler is located next to the forward power transmission line with the power channel, and the other end is connected to the transmit filter. the

Wherein, the cross-channel coupler is a 10dB coupler. the

In order to achieve the above object, the present invention also provides a system for measuring base station antenna feed voltage standing wave ratio, including base station radio frequency front end and voltage standing wave ratio measurement board, wherein the base station radio frequency front end includes a power channel, a non-power channel, and an active channel The first measurement channel corresponding to the power channel, the second measurement channel corresponding to the no-power channel, the voltage standing wave ratio measurement board is connected to the first measurement channel, and/or, the second measurement channel, characterized in that the base station radio frequency The front end further includes:

The cross-channel directional coupler is used to couple part of the forward power of the power channel of the base station RF front end to the non-power channel, one end of which is located next to the forward power transmission line of the power channel, and the other end is connected to the forward power of the non-power channel input interface;

The channel with power is a channel with input forward power; the channel with no power is a channel without input forward power. the

Wherein, the power channel of the radio frequency front end of the base station includes the first duplexer and the first antenna feeder interface, and the forward power transmission line of the power channel is:

a transmission line connected to the transmit interface of the first duplexer;

or

The transmission line between the combiner end of the first duplexer and the first antenna feeder interface. the

Wherein, the non-power channel includes a second duplexer and a second feeder interface, one end of the cross-channel directional coupler is located next to the forward power transmission line of the power channel, and the other end is connected to the second duplexer launch interface. the

Wherein, the powerless channel includes a receiving filter and a second feeder interface, and the radio frequency front end of the base station further includes:

Transmit filter, the passband is the transmit frequency band of the base station system, one end of which is connected to the cross-channel directional coupler, and the other end is connected to the second-day feeder interface;

One end of the cross-channel directional coupler is located next to the forward power transmission line of the power channel, and the other end is connected to the transmit filter. the

In order to achieve the above object, the present invention also provides a method for measuring base station antenna feeder voltage standing wave ratio, characterized in that the method comprises:

A. Coupling part of the forward signal of the power channel of the base station to the non-power channel of the base station as a coupling signal;

B. Coupling part of the coupled signal to the forward power measurement interface of the non-power channel, and the other part is output to the antenna feeder of the non-power channel;

C. Receive the reflected signal of the antenna feeder, couple part of the reflected signal to the reverse power measurement interface of the non-power channel, and absorb the other part with a filter;

D. Measure signal power at the forward power measurement interface and reverse power measurement interface to obtain forward power and reverse power;

E. According to the forward power and reverse power obtained in step D, calculate the voltage standing wave ratio of the antenna feeder of the non-power channel;

The channel with power is a channel with input forward power; the channel with no power is a channel without input forward power. the

Wherein, coupling the coupled signal to the base station without power channel as described in step A is:

A1. Perform band-pass filtering of the coupled signal with the pass band as the base station transmission band;

A2. Output the filtered signal to the base station without power channel. the

Wherein, as described in step A, part of the forward signal of the power channel of the base station is coupled to the non-power channel of the base station as a coupling signal:

One-tenth of the forward signal power of the power channel of the base station is coupled to the non-power channel of the base station as a coupling signal. the

Wherein, further include between step D and step E:

Use the coupling degree to correct the forward power when a part of the coupled signal is coupled to the forward power measurement interface of the non-power channel in step B, and when a part of the reflected signal is coupled to the reverse power measurement interface of the non-power channel in step C The degree of coupling corrects the reverse power. the

By adopting the technical solution provided by the present invention, using a directional coupler to couple a part of the forward power from the power channel with forward power input in the radio frequency front end of the base station to the powerless channel without forward power input in the radio frequency front end of the base station, As the forward power of the VSWR of the antenna feeder corresponding to the channel without power is measured, the measurement of the VSWR of the antenna feeder corresponding to the channel without forward power input is realized. At the same time, the influence on the coverage performance of the base station with the power channel is very small, and the normal operation of the power channel is not affected. the

Description of drawings

Figure 1 is a block diagram of a typical base station antenna feeder VSWR measurement system;

Fig. 2 is the block diagram of the radio frequency front end of the base station with two duplex channels;

Fig. 3 is the block diagram of the radio frequency front end of the base station with a duplex channel and a diversity receiving channel;

Fig. 4 is the block diagram of embodiment one of base station radio frequency front-end provided by the present invention;

Fig. 5 is the block diagram of embodiment two of base station radio frequency front-end provided by the present invention;

Fig. 6 is the block diagram of the third embodiment of the radio frequency front end of the base station provided by the present invention;

Fig. 7 is the block diagram of the fourth embodiment of the radio frequency front end of the base station provided by the present invention;

Fig. 8 is the impact on base station coverage in the case of X-polarized antennas after adopting the technical solution of the present invention;

Fig. 9 is the impact on base station coverage in the case of vertically polarized antennas after adopting the technical solution of the present invention;

Fig. 10 is a flowchart of a method for measuring antenna feeder VSWR provided by the present invention. the

Detailed ways

The core idea of the present invention is: in the radio frequency front end of the base station, use a directional coupler to couple a part of the forward power in the channel with the input forward power to the channel without the input forward power as the input forward power, thereby Realize the VSWR measurement of the antenna feeder corresponding to the channel without input forward power. the

In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. the

Please refer to FIG. 4 . FIG. 4 is a block diagram of Embodiment 1 of a radio frequency front end of a base station provided by the present invention. the

This embodiment is aimed at the situation shown in FIG. 2 , where the radio frequency front end of the base station has two duplex channels. Wherein, the first low-pass filter, the second low-pass filter, the first duplexer and the first antenna feeder interface constitute the first duplex channel, the first directional coupler, the second directional coupler, the first The reverse power measurement interface and the first forward power measurement interface constitute the first measurement channel corresponding to the first duplex channel; the third low-pass filter, the fourth low-pass filter, the second duplexer and the second The feed interface constitutes the second duplex channel, and the third directional coupler, the fourth directional coupler, the second reverse power measurement interface and the second forward power measurement interface constitute the second measurement channel corresponding to the second duplex channel . the

The transmit signal in the figure passes through the first low-pass filter and the first duplexer, and enters the antenna feeder corresponding to the first duplex channel from the first antenna feeder interface. The function of the duplexer is to realize the channel sharing of the receiving signal and the transmitting signal. It is divided into a combining end and a splitting end. The combining end has one interface, and the splitting end has at least two interfaces. The two interfaces at the splitter end of the duplexer are respectively connected to the receive signal channel and the transmit signal channel, called the receive interface and the transmit interface; the interface at the combiner end is connected to the common channel for sending and receiving. The role of the low-pass filter is to filter out high-order harmonics in the signal to improve system performance. The transmit signal output from the first duplexer is not only output to the antenna feeder interface, but also coupled to the first forward power measurement interface by the first directional coupler. The transmit signal that enters the antenna corresponding to the first duplex channel through the first antenna interface is reflected in the antenna, and the reflected signal enters the radio frequency front end of the base station from the first antenna interface. Part of the reflected signal is coupled to the first reverse power measurement interface by the second directional coupler, and the other part is filtered by the first duplexer. the

It should be noted that, in addition to reflected signals, there are also received signals that enter the radio frequency front end of the base station from the first antenna feeder interface. But relative to the reflected signal, the strength of the received signal is so small that it can be ignored. Generally speaking, the magnitude of the transmitted signal power is 10dBm to 100dBm, the magnitude of the reflected signal power is also 10dBm to 100dBm, and the magnitude of the received signal power is -100dBm. the

The fifth directional coupler is located at the end of the first low-pass filter away from the first antenna feeder interface, and its function is to couple a part of the transmit signal of the first duplex channel and output it to the second duplex channel as a positive direction The third low-pass filter of the power input interface is used as the input power of the second duplex channel. As an alternative, the fifth directional coupler may be placed between the first duplexer and the first antenna feeder interface, as shown in FIG. 5 . the

The transmission line at the end of the first low-pass filter away from the first antenna feeder interface and the transmission line between the first duplexer and the first antenna feeder interface have forward power transmission. Therefore, regardless of whether it is located at the position shown in FIG. 4 or the position shown in FIG. 5 , the fifth directional coupler can be regarded as being located next to the forward power transmission line of the first duplex channel with forward power. Since the fifth directional coupler implements cross-channel power coupling, the fifth directional coupler may be called a cross-channel directional coupler. the

For the second duplex channel, take the output of the fifth directional coupler as the forward power, pass through the third low-pass filter and the second duplexer, and enter the second duplex channel from the second feed interface day feed. The forward power signal output from the second duplexer is not only output to the second feed interface, but also coupled to the second forward power measurement interface by the third directional coupler. The transmit signal that enters the antenna feeder corresponding to the second duplex channel through the second day feeder interface is reflected in the antenna feeder, and the reflected signal enters the radio frequency front end of the base station from the second day feeder interface. Part of the reflected signal is coupled to the second reverse power measurement interface by the fourth directional coupler, and the other part is filtered by the second duplexer. the

Coupling part of the transmission signal from the first duplex channel to the second duplex channel will weaken the transmission capability of the first duplex channel; at the same time, the signal coupled to the second duplex channel by the fifth directional coupler will eventually be The signal emitted by the antenna feeder corresponding to the second duplex channel is superimposed with the signal emitted by the antenna feeder corresponding to the first duplex channel, thereby spatially affecting the signal emitted by the antenna feeder corresponding to the first duplex channel. Therefore, the coupling degree of the fifth directional coupler cannot be too small. However, if the coupling of the fifth directional coupler is too large, the forward power input to the second duplex channel will be too small, so as to affect the VSWR measurement of the antenna feeder corresponding to the second duplex channel. the

Considering the above factors comprehensively, the coupling degree of the fifth directional coupler can be 10dB, which is equivalent to one-tenth of the transmitted signal power being coupled to the third low-pass filter by the first directional coupler. Using the values mentioned above, if the transmitted signal power is 45dBm, then the signal power coupled to the third low-pass filter by the fifth directional coupler is 35dBm, and the signal power output to the first antenna feeder interface is about 44.5dBm . the

Please refer to FIG. 6 , which is a block diagram of Embodiment 3 of the radio frequency front end of the base station provided by the present invention. the

This embodiment is aimed at the situation shown in FIG. 3 , where the radio frequency front end of the base station has a duplex channel and a diversity receiving channel. Among them, the first low-pass filter, the second low-pass filter, the duplexer and the first antenna feeder interface constitute a duplex channel, the first directional coupler, the second directional coupler, the first reverse power measurement The interface and the first forward power measurement interface constitute the first measurement channel corresponding to the duplex channel; the fifth low-pass filter, the receiving filter and the second feed interface constitute the diversity receiving channel, the third directional coupler, the second The four directional couplers, the second reverse power measurement interface and the second forward power measurement interface constitute a second measurement channel corresponding to the diversity receiving channel. Among them, the receiving filter is a band-pass filter, and its passband is the receiving frequency band of the base station. the

In order to allow the diversity receiving channel to accept forward power, it is necessary to convert the receiving filter of the diversity receiving channel into a simple duplexer. The specific method is to first input the signal coupled by the fifth directional coupler into a transmitting filter, and then connect the other end of the transmitting filter to the second feeder interface. The transmit filter is also a bandpass filter, and its passband is the transmit frequency band of the base station. the

The fifth directional coupler is located at the end of the first low-pass filter away from the first antenna feeder interface, and its function is to couple a part of the transmit signal of the first duplex channel, and output the transmit filter as the input of the decomposed receive channel power. As an alternative, the fifth directional coupler may be placed between the first duplexer and the first antenna feeder interface, as shown in FIG. 7 . the

For the second duplex channel, the output of the fifth directional coupler is used as the forward power, passes through the transmit filter, and enters the antenna feeder corresponding to the second duplex channel from the second feeder interface. The transmit signal output from the second duplexer is not only output to the second feed interface, but also coupled to the second forward power measurement interface by the third directional coupler. The transmit signal that enters the antenna feeder corresponding to the diversity receiving channel through the second feeder interface is reflected in the antenna feeder, and the reflected signal enters the radio frequency front end of the base station from the second feeder interface. Part of the reflected signal is coupled to the second reverse power measurement interface by the fourth directional coupler, and the other part is filtered by the receiving filter. the

The signal coupled to the diversity receiving channel by the fifth directional coupler will eventually be transmitted through the antenna feeder corresponding to the diversity receiving channel, and the signals emitted by the antenna feeder corresponding to the duplex channel will be superimposed, thereby affecting the duplex channel correspondence in space. The signal emitted by the antenna feeder. the

For the RF front end of the base station shown in Figure 4 to Figure 7, connect the forward power measurement interface and reverse power measurement interface of the corresponding channel of the antenna feeder to be tested to the measurement module of the measurement board to form a system for measuring the VSWR of the base station antenna feeder , to measure the antenna feeder under test. the

As mentioned above, if the coupling degree of the fifth directional coupler is 10dB and the transmitted signal power is 45dBm, then the signal power output to the first antenna feeder interface is about 44.5dBm, and the fifth directional coupler is coupled to the second dual The signal power of the working channel or the diversity receiving channel is 35dBm. In this case, through simulation, if all channels use X-polarized antennas, the impact of signal superposition on base station coverage is shown in Figure 8; if all channels use vertically polarized antennas, the impact of signal superposition on base station coverage is as follows Figure 9 shows. the

Figure 8(a) is a schematic diagram of base station coverage when there is no signal superposition, Figure 8(b) is a schematic diagram of base station coverage when two signals with a phase difference of 180° are superimposed, and Figure 8(c) is a schematic diagram of two signals with a phase difference of 135° The schematic diagram of base station coverage during superposition, Fig. 8(d) is a schematic diagram of base station coverage when two signals with a phase difference of 90° are superimposed, Fig. 8(e) is a schematic diagram of base station coverage when two signals with a phase difference of 45° are superimposed, Fig. 8(f) is a schematic diagram of base station coverage when two signals with a phase difference of 0° are superimposed. The two signals here are respectively the signals transmitted by the antennas of the first duplex channel and the second duplex channel, or the signals transmitted by the antennas of the duplex channel and the diversity receiving channel. The powers of the two signals are 35dBm and 44.5dBm, respectively. In reality, the phase difference between the two signals is random, and only some values are taken to illustrate the situation during simulation. the

It can be seen from Figure 8 that the impact of signal superposition on base station coverage is negligible. the

In Figure 9, the smoother curve is a schematic diagram of base station coverage without signal superposition, and the more tortuous curve is a schematic diagram of base station coverage after two signals with powers of 35dBm and 44.5dBm are superimposed. It can be seen that the influence of signal superposition on base station coverage mainly lies in the influence on smoothness. The smoothness depends not only on the relative power of the two superimposed signals, but also on the distance between the two antennas. When obtaining the simulation results shown in Figure 9, it is assumed that the distance between the antennas is 10 times the wavelength. It can be seen that, in this case, the impact of signal superposition on the coverage of the base station is also very small. the

Please refer to Fig. 10, Fig. 10 is the flow chart of the method for measuring antenna feeder VSWR provided by the present invention, the method includes:

Step 101: Coupling a part of the forward signal of the power channel to the non-power channel as a coupling signal. the

In order to make the powered channel still work normally after a part of the forward signal is coupled to the unpowered channel, only a small part of the forward signal of the powered channel, such as one tenth, should be coupled to the unpowered channel. the

If the unpowered channel is the diversity receiving channel of the base station, it is necessary to pass the coupled signal through a band-pass filter whose passband is the transmitting frequency band of the base station, and then input it to the unpowered channel. the

Step 102: Coupling part of the coupled signal to the forward power measurement interface of the non-power channel, and outputting the other part to the antenna feeder of the non-power channel. the

Step 103: Receive the reflected signal of the antenna feeder of the unpowered channel, couple a part of the reflected signal of the antenna feeder to the reverse power measurement interface of the unpowered channel, and absorb the other part with a filter. the

The filter mentioned here is a bandpass filter, and its passband is the receiving frequency band of the base station system. Since the spectrum of the forward signal with the power channel is located in the transmit frequency band of the base station system, the spectrum of the coupled signal and the spectrum of the reflected signal of the antenna feeder are both located in the transmit frequency band of the base station system, so that the reflected signal is not coupled to the reverse power measurement interface part can be absorbed by the filter. the

Step 104: Measure the power at the forward power measurement interface and the reverse power measurement interface respectively. the

Step 105: Calculate the VSWR of the antenna feeder according to the measurement result. the

When calculating the VSWR of the antenna feeder, it is necessary to first calculate the reflection loss RL of the antenna feeder. If the ratio of the signal power of the forward power measurement interface coupled to the non-power channel to the coupled signal power in step 102 is the same as the ratio of the signal power of the reverse power measurement interface coupled to the non-power channel to the reflected signal power in step 103 , assuming that the forward power measured at the forward power measurement interface is P1, the reverse power measured at the reverse power measurement interface is P2, and the reflection loss of the antenna feeder is RL, then the forward power P1 and the reverse power P2 , Antenna feeder reflection loss RL has the following relationship:

|RL|＝|P2-P1|

If the above ratios are not equal, then before calculating the reflection loss RL, the antenna feeder reflection loss RL calculated by the above formula needs to be corrected by the coupling degree when the signal is coupled in step 102 and step 103 . Assume that the coupling degree when coupling the signal in step 102 is C1, the coupling degree when coupling the signal in step 103 is C2, the forward power measured at the forward power measurement interface is P1, and the reverse power measured at the reverse power measurement interface is P1. The forward power is P2, and the corrected forward power is:

P1'＝P1+|C1|

The corrected reverse power is:

P2'＝P2+|C2|

The reflection loss RL of the antenna feeder is:

|RL|P1′-P2′|=|(P1+|C1|)-(P2+|C2|)| Among them, the unit of power is dBm, the coupling degree is expressed in dB, and the reflection loss is expressed in dB. The voltage reflection coefficient Γ of the antenna feeder can be obtained from the antenna feeder reflection loss RL:

|Γ|＝10- ^|RL|/20

That is to say, the absolute value of Γ is a positive number greater than 0 and less than or equal to 1. the

Finally, the VSWR of the antenna feeder is obtained from the voltage reflection coefficient of the antenna feeder:

$\mathrm{<span\; class="notranslate">\; VSWR</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; \&Gamma;</span>}<span\; class="notranslate">\; |</span>}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; \&Gamma;</span>}<span\; class="notranslate">\; |</span>}$

In a word, the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. the

Claims (13)

1. a base station radio-frequency front end includes power channels, inactivity passage, it is characterized in that, this base station radio-frequency front end further comprises:

Stride the passage directional coupler, a part that is used for to the power channels forward power to be arranged is coupled to the inactivity passage, and the one end is positioned to be had by the forward power of the power channels transmission line, and the other end is connected to the forward power input interface of inactivity passage;

Described have power channels be have the input forward power passage; Described inactivity passage is not for importing the passage of forward power.

2. base station radio-frequency front end according to claim 1, described have power channels to comprise first duplexer and the first antenna feeder interface, it is characterized in that, and described have the forward power transmission line of power channels to be:

Be connected to the transmission line of the emission interface of first duplexer;

Or

First duplexer close transmission line between the terminal and the first antenna feeder interface.

3. base station radio-frequency front end according to claim 1 and 2, it is characterized in that, described inactivity passage comprises second duplexer and the second antenna feeder interface, a described end of striding the passage directional coupler is positioned at and has by the forward power of the power channels transmission line, and the other end is connected to the emission interface of second duplexer.

4. base station radio-frequency front end according to claim 1 and 2 is characterized in that, described inactivity passage comprises the receiving filter and the second antenna feeder interface, and this base station radio-frequency front end further comprises:

Emission filter, passband are the transmit frequency band of base station system, and the one end is connected to strides the passage directional coupler, and the other end is connected to the second antenna feeder interface;

A described end of striding the passage directional coupler is positioned at and has by the forward power of the power channels transmission line, and the other end is connected to emission filter.

5. the device of measurement base station antenna feeder voltage standing wave ratio according to claim 1 is characterized in that, the described passage coupler of striding is the 10dB coupler.

6. system of measuring the base station antenna feeder voltage standing wave ratio, comprise base station radio-frequency front end and voltage standing wave ratio measurement plate, wherein the base station radio-frequency front end includes power channels, inactivity passage, the first measurement passage corresponding with power channels is arranged, the second measurement passage corresponding with the inactivity passage, voltage standing wave ratio is measured plate and first and is measured passage, and/or, second measures passage links to each other, and it is characterized in that described base station radio-frequency front end further comprises:

Stride the passage directional coupler, be used for having the part of power channels forward power to be coupled to the inactivity passage base station radio-frequency front end, the one end is positioned to be had by the forward power of the power channels transmission line, and the other end is connected to the forward power input interface of inactivity passage;

Described have power channels be have the input forward power passage; Described inactivity passage is not for importing the passage of forward power.

7. the system of measurement base station antenna feeder voltage standing wave ratio according to claim 6, the power channels that has of described base station radio-frequency front end comprises first duplexer and the first antenna feeder interface, it is characterized in that, described have the forward power transmission line of power channels to be:

Be connected to the transmission line of the emission interface of first duplexer;

Or

First duplexer close transmission line between the terminal and the first antenna feeder interface.

8. according to the system of claim 6 or 7 described measurement base station antenna feeder voltage standing wave ratioes, it is characterized in that, described inactivity passage comprises second duplexer and the second antenna feeder interface, a described end of striding the passage directional coupler is positioned at and has by the forward power of the power channels transmission line, and the other end is connected to the emission interface of second duplexer.

9. according to the system of claim 6 or 7 described measurement base station antenna feeder voltage standing wave ratioes, it is characterized in that described inactivity passage comprises the receiving filter and the second antenna feeder interface, described base station radio-frequency front end further comprises:

Emission filter, passband are the transmit frequency band of base station system, and the one end is connected to strides the passage directional coupler, and the other end is connected to the second antenna feeder interface;

A described end of striding the passage directional coupler is positioned at and has by the forward power of the power channels transmission line, and the other end is connected to emission filter.

10. a method of measuring the base station antenna feeder voltage standing wave ratio is characterized in that, this method comprises:

A, the base station there is the part in the forward signal of power channels, is coupled to base station inactivity passage as coupled signal;

B, the forward power that the part of coupled signal is coupled to the inactivity passage are measured interface, and another part outputs in the antenna feeder of inactivity passage;

C, receive the reflected signal of described antenna feeder, the backward power that the part of reflected signal is coupled to the inactivity passage is measured interface, and another part absorbs with filter;

D, measure interface and backward power is measured the interface measured signal power, obtain forward power and backward power in described forward power;

E, according to resulting forward power and backward power among the step D, calculate the voltage standing wave ratio of inactivity passage antenna feeder;

Described have power channels be have the input forward power passage; Described inactivity passage is not for importing the passage of forward power.

11. the method for measurement base station antenna feeder voltage standing wave ratio according to claim 10 is characterized in that, steps A is described to be coupled to base station inactivity passage with coupled signal and to be:

A1, coupled signal is carried out the bandpass filtering that passband is the base station frequency range;

A2, filtered signal is outputed to base station inactivity passage.

12. the method for measurement base station antenna feeder voltage standing wave ratio according to claim 11 is characterized in that, steps A is described to have the base station a part in the forward signal of power channels, is coupled to base station inactivity passage as coupled signal and is:

The base station is had power channels forward signal power 1/10th, be coupled to base station inactivity passage as coupled signal.

13. the method for measurement base station antenna feeder voltage standing wave ratio according to claim 11 is characterized in that, further comprises between step D and step e:

Degree of coupling correction forward power when measuring interface with the forward power that among the step B part of coupled signal is coupled to the inactivity passage, the degree of coupling correction backward power during with the backward power measurement interface that among the step C part of reflected signal is coupled to the inactivity passage.

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