CN201383536Y - Cavity RF Devices with Capacitive Cross-Coupling - Google Patents

Abstract

The utility model discloses a cavity radio frequency device with a capacitive cross-coupling device, which comprises at least two resonant cavities arranged in a straight line arranged in the cavity, and a longitudinal channel communicating with each other is provided between the two resonant cavities. The capacitive cross-coupling device includes at least one conductor arranged along the longitudinal direction of the channel, the conductor is insulated from the sidewall of the channel at any position, connected to the bottom of the cavity, and has a protruding cavity for carrying out The part where the coupling amount is adjusted. Compared with the prior art, the utility model has at least the following advantages: the capacitive cross-coupling device can be arranged in a straight line between the resonant cavities, so that the cavity space is fully utilized, the Q value of the resonant cavity becomes larger and the volume of the device Reduced size, reduced weight, and reduced cost; the suppression of downlink frequency bands to uplink frequency bands can be increased; the amount of capacitive cross-coupling can be adjusted arbitrarily, reducing the number of disassembly and assembly of cover plates due to adjusting the length of the fly rod in traditional technology, and the operation is flexible and easy , greatly improving the debugging efficiency.

Description

Cavity RF Devices with Capacitive Cross-Coupling

【Technical field】

The utility model relates to a cavity radio frequency device, including a filter, a duplexer, a combiner and the like, in particular to a cavity radio frequency device with a capacitive cross-coupling device.

【technical background】

With the development of highly integrated and miniaturized communication systems, operators and equipment manufacturers have put forward higher requirements for system modules in terms of performance and cost.

Cavity RF devices such as filters, duplexers, and combiners play an important role in communication systems. In order to prevent signal interference between communication systems, system operators have higher and higher requirements for out-of-band suppression of filters. .

In the path of the cavity radio frequency device, in order to meet the requirement of the downlink frequency band to suppress the uplink frequency band, it is generally realized by adding a capacitive cross-coupling device in the cavity design. As shown in Figure 1, the traditional capacitive cross-coupling device is realized by adding an ungrounded metal fly rod 2 supported by a dielectric between two separated cavity resonators. This cross-coupling method has the following aspects Shortcomings:

First of all, this cross-coupling arrangement of resonant cavities requires a large volume and low space utilization, which is not conducive to the development of device miniaturization. As shown in Figure 1, resonant cavity 12 must be biased outward relative to resonant cavities 11 and 13 As a result, the volume of the entire cavity 1 is relatively large;

Secondly, in the debugging process, if you want to change the coupling amount, you must remove the cover to adjust the length of the metal flying rod, which has a great impact on the debugging efficiency;

Furthermore, in the application, if a strong capacitive coupling is required, the length of the metal fly rod needs to be lengthened, and lengthening the metal fly rod will shorten the distance between the metal fly rod and the resonant column, which may cause high-power signals to pass through When the device will be ignited and burned out.

【Content of utility model】

The purpose of this utility model is to solve the above-mentioned deficiencies, and propose a capacitive cross-coupling device with high power capacity that can reduce the volume and meet the requirements of capacitive cross-coupling without removing the cover plate. The cavity radio frequency device of the device.

To achieve this purpose, the utility model adopts the following technical solutions:

The utility model is a cavity radio frequency device with a capacitive cross-coupling device, which comprises at least two resonant cavities arranged in a straight line arranged in the cavity, and a longitudinal channel communicating with each other is provided between the two resonant cavities. The capacitive cross-coupling device includes at least one conductor arranged along the longitudinal direction of the channel, the conductor is insulated from the side wall of the channel at any position, connected to the bottom of the cavity, and has a cavity protruding from the cavity for coupling Volume adjustment part.

The elongated channels are offset on the same side of the two resonant cavities.

The capacitive cross-coupling device also includes a pair of clamps, the longitudinal section of the conductor is U-shaped, the conductor has a longitudinal portion and two arms folded from the longitudinal portion in the same direction, and each of the two arms passes through a The clip is inserted into a preset through hole of the cavity radio frequency device as the position for adjusting the coupling amount.

The capacitive cross-coupling device further includes an insulating sleeve sleeved on the longitudinal portion of the conductor.

The bending angle between the longitudinal portion of the conductor and the two arm portions is at right angles.

At least one resonant cavity in the cavity radio frequency device is arranged between the two resonant cavities coupled by conductors and forms a linear arrangement with them.

The above-mentioned cavity radio frequency device of the utility model can be directly applied to filters, duplexers and combiners.

Compared with the prior art, the utility model has the following advantages:

1. The capacitive cross-coupling device is convenient for the resonant cavities to be arranged in a straight line, so that the space of the cavity is fully utilized, the Q value of the resonant cavity is increased, and the volume, weight and cost of the device are reduced;

2. This design can increase the suppression of the downlink frequency band to the uplink frequency band, which meets the system's requirements for out-of-band suppression indicators;

3. Even if the conductor is far away from the resonant column in the resonant cavity, it can achieve strong capacitive cross-coupling, which improves the power capacity of the device;

4. The amount of capacitive cross-coupling can be adjusted arbitrarily, which reduces the number of disassembly and assembly of the cover plate due to the adjustment of the length of the flying rod in the traditional technology. The operation is flexible and easy, and the debugging efficiency is greatly improved.

【Description of drawings】

FIG. 1 is a schematic structural diagram of a traditional capacitive cross-coupling method;

Fig. 2 is a structural schematic diagram of an embodiment of a cavity radio frequency device of the present invention;

Fig. 3 is A-A sectional view of Fig. 2;

Fig. 4 is an enlarged view of part B in Fig. 3;

FIG. 5 is a transmission characteristic diagram of the embodiment disclosed in FIG. 2 .

【Detailed ways】

Below in conjunction with accompanying drawing and embodiment the utility model is described further:

Please refer to Fig. 2, the utility model has the cavity radio frequency device of capacitive cross-coupling device, on a cavity 1, three resonant cavities 11, 12, 13 are arranged in a straight line, the left resonant cavity 11 and the right resonant cavity 13 Due to the division of the middle resonant cavity 12 and not being adjacent, a longitudinal passage 14 communicating with each other is provided between the left resonant cavity 11 and the right resonant cavity 13, and the passage 14 is offset between the resonant cavities 11 and 13. On the same side to leave enough space for setting the middle resonant cavity 12 . In order to enhance the capacitive cross-coupling between the resonators 11 and 13, a capacitive cross-coupling device 3 is arranged in the channel 14. Due to the arrangement of the capacitive cross-coupling device 3 , the resonant cavity 12 can be arranged in line with the resonant cavities 11 and 13 to reduce the volume of the cavity 1 while maintaining better electrical performance.

Please refer to FIG. 2 , FIG. 3 and FIG. 4 . FIG. 3 is a sectional view along A-A direction in FIG. 2 , further revealing the detailed structure of the capacitive cross-coupling device 3 in detail. The capacitive cross-coupling device 3 includes a conductor 4 made of silver-plated copper wire, an insulating sleeve 5 and two clamps 6. The longitudinal section of the conductor 4 is U-shaped, with a longitudinal portion and from the longitudinal Two arm portions 41 folded out in the same direction at the two ends of the portion, the knuckle between the arm portion 41 and the lengthwise portion is a right angle (also suitably changed in response to specific needs). After the insulating sleeve 5 is used for the conductor 4 to pass therethrough, the silver-plated copper wire can be prevented from contacting the sidewall of the longitudinal passage 14 due to vibration, so as to avoid generating electric sparks. Figure 3 also reveals that the bottom of the cavity 1 is preset with two through holes 10 for the two arms 41 of the conductor 4 to pass through and set thereon, and the two arms 41 pass through a clamp 6 and two holes respectively. Of the 10-phase installation. The two clamps 6, please refer to Figure 4, Figure 4 is an enlarged view of part B in Figure 3, representatively showing the installation of a conductor arm 41 and the cavity hole 10, the clamp 6 is Cylindrical, it is just placed in the two preset holes 10 of the cavity 1, and the two arms 41 of the conductor protrude out of the cavity 1 through the holes formed by the cylindrical clamp 6, so that it can be placed in the cavity In addition to 1, the purpose of adjusting the coupling amount is achieved by stretching the two arms 41 of the conductor 4, even if the cavity 1 is covered by a cover plate (not shown), it is no exception. After the capacitive coupling amount is adjusted, the conductor The redundant line segments of the two arms 41 of 4 are cut off, and then welded with the clamp 6 to form a solid solder joint 9, which completes the installation of the capacitive cross-coupling device 3 . Wherein, the wire clamp 6 is made of metal material to ensure that the conductor 4 is connected to the common ground of the cavity 1 . The connection between the clamp 6 and the hole 10 of the cavity can be connected by a screw lock, or other similar mechanical connection methods, and these connection methods should be known to those of ordinary skill in the art.

The above-mentioned U-shaped conductor 4 is installed with the cavity 1, and communicates with two separated resonant cavities 11 and 13. In terms of phase, the U-shaped conductor 4 plays a role of +90°, and is supported by a medium. Like an ungrounded metal fly rod, the transmission zero point generated is on the left side of the passband, which has the effect of suppressing the uplink frequency band, as shown in Figure 5.

The embodiment of the cavity radio-frequency device in the utility model, as shown in Figure 2, after adding the capacitive cross-coupling device, the out-of-band rejection of the filter composed of three resonant cavities can reach more than 40dB. The capacitive cross-coupling device is suitable for similar known products such as filters, duplexers and combiners. This kind of capacitive cross-coupling device is obviously an improvement on the fly rod coupling device in this type of cavity radio frequency device, and can theoretically directly replace the currently existing scheme using fly rod coupling.

The above-mentioned embodiment is a preferred implementation of the present utility model, but the implementation of the present utility model is not only limited by the above-mentioned examples, any other changes, modifications, Substitution, combination, and simplification should all be equivalent replacement methods, and are all included in the protection scope of the present utility model.

Claims (9)

1. A cavity radio frequency device with a capacitive cross-coupling device, comprising at least two resonant cavities arranged in a straight line in the cavity, characterized in that a longitudinal channel communicating with each other is provided between the two resonant cavities , the capacitive cross-coupling device includes at least one conductor arranged along the longitudinal direction of the channel, the conductor is insulated from the sidewall of the channel at any position, is connected to the bottom of the cavity, and has a structure protruding from the cavity to A part for adjusting the coupling amount. 2. The cavity radio frequency device with capacitive cross-coupling device according to claim 1, characterized in that: the longitudinal channels are offset on the same side of the two resonant cavities. 3. The cavity radio frequency device with capacitive cross-coupling device according to claim 1 or 2, characterized in that: the capacitive cross-coupling device also includes a pair of clamps, the longitudinal section of the conductor is U-shaped, The conductor has a lengthwise portion and two arms folded in the same direction from the lengthwise portion, and each of the two arms is inserted into a predetermined through hole in the cavity of the cavity radio frequency device through a clamp as The part that adjusts the coupling amount. 4. The cavity radio frequency device with capacitive cross-coupling device according to claim 3, characterized in that: the capacitive cross-coupling device further comprises an insulating sleeve, and the insulating sleeve is sleeved on the longitudinal direction of the conductor. Minister. 5. The cavity radio frequency device with capacitive cross-coupling device according to claim 3, characterized in that: the bending angle between the longitudinal part of the conductor and the two arm parts is a right angle. 6. The cavity radio frequency device with a capacitive cross-coupling device according to any one of claims 1 to 5, characterized in that: at least one resonant cavity in the cavity radio frequency device is arranged between the two coupled by conductors between the resonators and form a linear arrangement with them. 7. A filter, characterized in that it has a cavity radio frequency device according to any one of claims 1-6. 8. A duplexer, characterized in that it has a cavity radio frequency device as claimed in any one of claims 1 to 6. 9. A combiner, characterized in that it has a cavity radio frequency device according to any one of claims 1-6.

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