CN1254926C - Portable radio device - Google Patents

Abstract

A portable wireless device operates in a frequency range. The portable wireless device has a housing, a circuit board, a battery, a card slot, a multimedia connector, and a resonator. The resonator takes a dielectric material as a main body, and a positive electrode and a negative electrode are formed on two opposite side surfaces of the dielectric material. The positive electrode has a positive adjustment sheet and the negative electrode has a negative adjustment sheet, and a capacitance effect is formed between the positive adjustment sheet and the negative adjustment sheet to adjust impedance matching and phase. When the resonator operates at a resonant frequency, energy can be coupled to the conductor elements to collectively generate a radiation field of the portable wireless device.

Description

portable wireless device

technical field

The present invention relates to a wireless device, in particular to a portable wireless device.

Background technique

In recent years, the electronic industry has developed vigorously. In addition to the thin, light and compact appearance of electronic products, the ability of wireless communication is also increasingly valued. Such as notebook computers, mobile phones (called cell phones) or personal digital assistants (Personal Digital Assistant, PDA), their wireless communication capabilities are ruthlessly subjected to the most stringent scrutiny in the market, and have become important reference indicators for performance. Especially for personal digital assistants, its compact size and wireless network function have always been the biggest selling points, so various manufacturers are all doing their best to carry out research and development to seize business opportunities.

In wireless applications, the antenna is a very important component. Since the characteristics of the antenna directly affect the quality of signal transmission and reception, many research and development units have invested considerable manpower and material resources in order to improve the operational characteristics of the antenna.

Taking PDA as an example, the design concept of concealed antenna is the mainstream design nowadays, but the transmission quality of the antenna signal is also sacrificed because the antenna is covered in the casing. More specifically, many conductive elements are unavoidably configured inside the PDA, such as circuit boards, batteries, card slots (such as memory cards or I/O cards) and multimedia connectors (such as microphone or earphone connectors), etc., due to these conductive elements All will reflect or absorb wireless signals, thus directly affecting the transmission characteristics of antenna signals. In other words, the traditional antenna may work well if it can exclude the condition that there are conductive elements nearby, but when the antenna is placed in the case, the operating characteristics will be greatly reduced due to the influence of environmental factors, which directly affects the wireless signal. send and receive quality. Of course, such problems not only occur in the design of PDAs, other portable wireless devices such as mobile phones or notebook computers, etc., will face the same problem as long as they have hidden antennas, which is quite a headache. Therefore, how to improve the design of the concealed antenna to avoid adverse effects of the conductor element on the signal, and even improve the quality of the antenna signal by using the conductor element, has become an urgent problem to be overcome.

Contents of the invention

The object of the present invention is to provide a portable wireless device in which a resonator and a conductor element jointly contribute to a required radiation field.

The purpose of the present invention is achieved by providing a portable wireless device with a resonant bandwidth, which includes: a plurality of conductive components, which are used as a conductor element; and A resonator, including: a dielectric material; a positive electrode formed on one side of the dielectric material, the positive electrode has inductance characteristics, and has a positive adjustment plate; and a negative electrode, formed on the dielectric material and the positive electrode On the other side corresponding to the electrode, the negative electrode has a negative adjustment piece, and there is a capacitive effect between the negative adjustment piece and the positive adjustment piece, and the resonator operates at the resonant bandwidth; wherein, when the resonator resonates, the Energy is coupled to the conductor elements to collectively generate a radiated field of the portable wireless device.

The present invention also provides a portable wireless device with a resonant bandwidth. The portable wireless device includes: a motherboard; a battery; and a resonator, including: a dielectric material; a positive electrode formed on the dielectric material On one side, the positive electrode has inductance characteristics and has a positive adjustment piece; and a negative electrode is formed on the other side of the dielectric material corresponding to the positive electrode, and the negative electrode has a negative adjustment piece, and the There is a capacitive effect between the negative adjustment piece and the positive adjustment piece; wherein, when the resonator operates in the resonant bandwidth, energy can be coupled to the battery and the circuit board to jointly generate a radiation field of the portable wireless device.

According to the purpose of the present invention, a kind of portable wireless device is proposed, and the brief description of this device is as follows:

A portable wireless device operating in a frequency range. The shell of the portable wireless device is equipped with conductive components such as circuit board, battery, card slot, multimedia connector, and a resonator. The resonator uses a dielectric material as the main body, and forms a positive electrode and a negative electrode on the opposite sides of the dielectric material. The positive electrode has a positive electrode adjustment piece and the negative electrode has a negative electrode adjustment piece. There is a capacitive effect between the positive and negative electrode adjustment pieces. , to adjust impedance matching and phase. When the resonator operates in the resonant frequency range, energy can be coupled to the conductor elements to collectively generate a radiated field for the portable wireless device.

Description of drawings

FIG. 1 is a schematic diagram of a portable wireless device according to a preferred embodiment of the present invention;

Fig. 2 is a schematic structural view of the shared holder of Fig. 1;

Fig. 3 is the schematic diagram of positive electrode and negative electrode of Fig. 2;

Fig. 4 is a graph of return loss measurement results when the resonator is not placed in a portable wireless device;

Figure 5 is a graph of the return loss measurement results after the resonator is placed in a portable wireless device;

Fig. 6 is a schematic diagram of a 30-degree plane.

Detailed ways

There are many types of portable wireless devices with wireless transmission functions, such as personal digital assistants (Personal Digital Assistant, PDA), mobile phones, or notebook computers. Each of the portable wireless devices is designed to operate within a frequency range including frequencies applicable to Bluetooth antennas or 802.11b antennas, such as 2.4GHz˜2.5GHz. Please refer to FIG. 1 , which shows a schematic diagram of a portable wireless device according to a preferred embodiment of the present invention. In this embodiment, the portable wireless device 100 is a personal digital assistant, which includes a casing 110 , and a battery 130 , a card slot 150 , a multimedia connector 170 and a motherboard 190 are disposed in the casing 110 . Wherein the card slot 150 may be a memory card (memory card) slot or an I/O card slot, and the multimedia connector 170 may be a microphone connector or an earphone connector. Since the portable wireless device 100 adopts a hidden antenna design, the resonator 10 is also disposed inside the casing. It should be noted that the above-mentioned relative positions of the resonator 10 , the battery 130 , the card slot 150 , the multimedia connector 170 and the motherboard 190 are only for convenience of description, and such configurations are not necessarily required.

The idea of the present invention is to use the resonator 10 to couple the energy to conductor elements such as the battery 130, the card slot 150, the multimedia connector 170, and the motherboard 190 when the resonator 10 operates in the resonant frequency range, so as to jointly generate the radiation field of the portable wireless device 100. . In other words, the resonator 10, the battery 130, the card slot 150, the multimedia connector 170, and the motherboard 190 are all antenna elements in a broad sense, and not only the operating characteristics of the resonator 10 (in fact, the resonance The device 10 itself has a basic antenna structure), and the effects of each conductor element must be taken into consideration to adjust the most effective radiation pattern.

During design, the high frequency structure simulator (HFSS) software can be used to structure the composition of the antenna, and then use the software to simulate the characteristics of the radiation field. In order to make the simulation result as close as possible to the actual value, in practice, the structure of the resonator 10 can be roughly determined first, and then various conductor elements are added according to the actual configuration of the product, such as the battery 130, the circuit board 190, the card slot 150 and The size and position of components such as the multimedia connector 170 . Of course, the shell 110 can also be considered as a conductor element (because the product may use a coated shell with a conductive material), and then use software to simulate the resonator 10 when it is excited. response. During the simulation, the size and orientation of each conductor element can be regarded as fixed known conditions, so that only the structure of the resonator 10 needs to be adjusted to change the radiation pattern and optimize the overall frequency response. Hereinafter, the structure and adjustment method of the resonator 10 will be further described.

Please refer to FIG. 2 , which shows a schematic structural diagram of the resonator 10 . The resonator 10 is composed of a positive electrode 210, a dielectric material 230 and a negative electrode 250, wherein the dielectric material 230 is, for example, glass fiber, and the positive and negative electrodes are respectively formed on the front and back sides of the dielectric material 230 (that is, the opposite sides of the dielectric material 230). side). Resonator 10 can also be fabricated using FR-4 printed circuit boards. In addition, the contact point 215 on the positive electrode 210 and the contact point 255 on the negative electrode 250 are used to transmit high-frequency signals. The signal phase difference between the contact point 215 and the contact point 255 is 180 degrees. It is customary to call the contact point 215 a high-frequency signal. feed point. It should be noted that the positive electrode 210 also includes a bent portion 212 , and the bent portion 212 itself has an inductive characteristic. Furthermore, the positive electrode 210 and the negative electrode 250 respectively have a positive electrode adjustment piece 210a and a negative electrode adjustment piece 250a, 250b, 250c, and each adjustment piece has a capacitive effect, through which each capacitance effect can adjust impedance matching (impedance matching), It can also achieve the purpose of adjusting the phase, so that the radiation result can be optimized. In addition, the overall winding length of the positive electrode 210 can be adjusted according to the desired operating frequency, so that the portable wireless device can be used in a specific frequency range.

Next, please refer to FIG. 3 , which shows a schematic diagram of the positive electrode 210 and the negative electrode 250 . The positive electrode 210 has a single positive tab 210a, while the negative electrode 250 has three negative tabs 250a, 250b, 250c of smaller size (compared to the positive tab 210a). In order to easily distinguish these three negative electrode adjustment pieces, the negative electrode adjustment piece 250b with a larger size and located in the center can be called the main adjustment piece, and the smaller negative electrode adjustment pieces 250a and 250c on both sides of the main adjustment piece are called secondary adjustment pieces. piece. Since the negative electrode adjustment sheets 250a, 250b, and 250c are isolated and disposed on the back of the positive electrode adjustment sheet 210a by the dielectric material 230, there is a capacitive effect between the positive electrode adjustment sheet 210a and the negative electrode adjustment sheets 250a, 250b, and 250c. In other words, there is a capacitor C1 between the positive adjusting plate 210a and the negative adjusting plate 250a, a capacitor C2 between the positive adjusting plate 210a and the negative adjusting plate 250b, and a capacitor C3 between the positive adjusting plate 210a and the negative adjusting plate 250c. In addition, there is a capacitance C4 between the negative adjustment sheet 250a and the negative adjustment sheet 250b, and there is a capacitance C5 between the negative adjustment sheet 250b and the negative adjustment sheet 250c. In this way, up to five capacitors in each structure can be adjusted, and the impedance matching and phase can be changed only by changing the size of the negative adjustment plates 250a, 250b, 250c, so the best radiation effect can be adjusted very accurately.

Then, based on the results obtained from the high-frequency structure simulation, the real object is made, and the measurement results before and after the resonator is placed in the portable wireless device, operating in the same resonance frequency range, are compared, and the differences between the two are observed. Please refer to FIG. 4 , which shows the measurement results of return loss when the resonator 10 is not placed in a portable wireless device. In this case, the operating characteristics of the resonator 10 are measured alone, and no conductor elements are arranged around it. According to the measurement results, label 2 shows a return loss of -9.6494dB at an operating frequency of 2.45GHz, which is not ideal. And label 1 shows that the return loss when operating at 2.4GHz is -10.249dB, and label 3 shows that the return loss when operating at 2.5GHz is -9.0136dB, the performance is not ideal. Next, please refer to FIG. 5 , which shows the measurement results of the return loss after the resonator 10 is placed in a portable wireless device. At this time, the resonator 10 is located in the portable wireless device, and conductor elements such as the battery 130 , the circuit board 190 , the card slot 150 and the multimedia connector 170 are disposed around it. According to the measurement results, symbol 3 shows the return loss when operating at 2.45GHz is -43.125dB, symbol 2 shows the return loss when operating at 2.4GHz is -31.712dB, and symbol 4 shows the return loss when operating at 2.5GHz It is -31.807dB, and the operation characteristics are extremely good. In addition, it can be seen from labels 1 and 5 that the operating bandwidth is as high as 771.4MHz (2.05870-2.83006GHz), and the high-frequency characteristics are excellent.

Table 1 summarizes the gain measurement results on several main reference planes under different operating frequencies. What needs to be explained is the data set of 30° plane, which is based on the fact that ordinary people are used to holding the portable wireless device 100 with their hands and operating it at an angle of about 30° to the vertical line, as shown in the figure 6 is shown. However, it can be seen from the actual measurement results that the gain of the portable wireless device at this time is better than that of the other three measurement planes, which is highly practical. Frequency (GHz) 2.40 2.45 2.50 30° plane peak gain 1.85 1.15 1.48 average gain -3.94 -4.57 -3.85 XY plane peak gain -0.58 -1.15 -1.55 average gain -4.41 -5.08 -4.43 YZ plane peak gain -1.31 -1.82 -1.76 average gain -4.89 -5.46 -5.10 XZ plane peak gain -2.96 -3.52 -3.15 average gain -6.47 -7.17 -6.40

Table I

The portable wireless device disclosed in the above-mentioned embodiments of the present invention can jointly contribute the required radiation field through the resonator and the conductor element, so the conductor element not only does not affect the radiation characteristics of the antenna, but contributes to the overall radiation effect, so that Portable wireless devices have better high frequency characteristics.

In summary, although the present invention has been disclosed in conjunction with the above preferred embodiment, it is not intended to limit the present invention, and any person skilled in the art can make various modifications without departing from the spirit and scope of the present invention. Move and retouch.

Claims (23)

1. A portable wireless device having a resonant bandwidth, the portable wireless device comprising: A plurality of conductive components, the components of which are used as a conductor element; and a resonator comprising: a dielectric material; A positive electrode is formed on one side of the dielectric material, the positive electrode has inductance characteristics, and has a positive electrode adjustment piece; and A negative electrode is formed on the other side of the dielectric material corresponding to the positive electrode. The negative electrode has a negative adjustment piece. There is a capacitive effect between the negative adjustment piece and the positive adjustment piece. The resonator operates at the resonance bandwidth; Wherein, the resonator can couple energy to the conductor element when it resonates, so as to jointly generate the radiation field of the portable wireless device. 2. The portable wireless device as claimed in claim 1, wherein the negative electrode tab comprises a main tab, a first sub-tab and a second sub-tab, the first sub-tab and the second sub-tab The slices are arranged on both sides of the main adjusting slice and have capacitive effect with the main adjusting slice respectively. 3. The portable wireless device as claimed in claim 1, wherein the conductor element comprises a circuit board. 4. The portable wireless device of claim 1, wherein the conductive element comprises a battery. 5. The portable wireless device as claimed in claim 1, wherein the conductive element comprises a card slot. 6. The portable wireless device as claimed in claim 1, wherein the conductor element comprises a multimedia connector. 7. The portable wireless device as claimed in claim 6, wherein the multimedia connector is a microphone connector. 8. The portable wireless device as claimed in claim 6, wherein the multimedia connector is an earphone connector. 9. The portable wireless device of claim 1, wherein the conductor element includes a housing coated with a conductive material. 10. The portable wireless device as claimed in claim 1, wherein the material of the resonator comprises FR-4 printed circuit board. 11. A portable wireless device having a resonant bandwidth, the portable wireless device comprising: a motherboard; a battery; and a resonator comprising: a dielectric material; A positive electrode is formed on one side of the dielectric material, the positive electrode has inductance characteristics, and has a positive electrode adjustment piece; and A negative electrode is formed on the other side of the dielectric material corresponding to the positive electrode, and the negative electrode has a negative electrode adjustment piece, and there is a capacitive effect between the negative electrode adjustment piece and the positive electrode adjustment piece; Wherein, the resonator can couple energy to the battery and the circuit board when operating in the resonant bandwidth, so as to jointly generate the radiation field of the portable wireless device. 12. The portable wireless device of claim 11, wherein the dielectric material is glass fiber. 13. The portable wireless device of claim 11, wherein the portable wireless device is a personal digital assistant. 14. The portable wireless device of claim 11, wherein the portable wireless device is a cell phone. 15. The portable wireless device of claim 11, wherein the portable wireless device is a notebook computer. 16. The portable wireless device as claimed in claim 11, wherein the negative tab comprises a main tab, a first sub-tab and a second sub-tab, the first sub-tab and the second sub-tab The slices are arranged on both sides of the main adjusting slice and have capacitive effect with the main adjusting slice respectively. 17. The portable wireless device as claimed in claim 16, wherein the portable wireless device further comprises a card slot for receiving the energy coupled by the resonator, and jointly generating the portable wireless device with the battery and the circuit board. Radiation field of the device. 18. The portable wireless device of claim 17, wherein the card slot is a memory card slot. 19. The portable wireless device of claim 17, wherein the card slot is an I/O card slot. 20. The portable wireless device as claimed in claim 16, wherein the portable wireless device further comprises a multimedia connector for receiving the energy coupled by the resonator, and jointly producing the portable wireless device with the battery and the circuit board radiation field. 21. The portable wireless device as claimed in claim 20, wherein the multimedia connector is a microphone connector. 22. The portable wireless device as claimed in claim 20, wherein the multimedia connector is an earphone connector. 23. The portable wireless device as claimed in claim 16, wherein the portable wireless device further comprises a shell with a conductive material coating for receiving the energy coupled by the resonator, together with the battery and the circuit board A radiated field of the portable wireless device is generated.

Images