WO2022048130A1

WO2022048130A1 - Filter and radio transceiving device

Info

Publication number: WO2022048130A1
Application number: PCT/CN2021/081520
Authority: WO
Inventors: 朱琦; 孙旗
Original assignee: 江苏灿勤科技股份有限公司
Priority date: 2020-09-03
Filing date: 2021-03-18
Publication date: 2022-03-10
Also published as: CN213783265U; CN212342781U; CN112072226A; CN112671370B; CN112671370A

Abstract

The present invention discloses a filter and a radio transceiving device. The filter comprises two ports and two CQ coupling structures; each CQ coupling structure comprises four resonators and four coupling apparatuses; each coupling apparatus is provided between two adjacent resonators; the two CQ coupling structures share two resonators and one coupling apparatus; the polarity or phase of one coupling apparatus in each CQ coupling structure is opposite to the polarity or phase of other coupling apparatuses; one of the ports is coupled to one of the two resonators that are shared, and the other port is coupled to the adjacent resonators that are located on the same side, so that the filter forms an asymmetric structure and has four transmission zeros outside a passband, wherein two transmission zeros are located at a low frequency band outside the passband of the filter, and the other two transmission zeros are located at a high frequency band outside the passband of the filter. The filter of the present filter greatly improves the out-of-band rejection of the filter, and facilitates design and manufacturing of the filter.

Description

A filter and radio transceiver

claim of priority

This application claims the priority of the Chinese patent application with the application number 202010913834.7 filed with the China Patent Office on September 3, 2020, and the patent application filed with the China Patent Office on September 15, 2020 with the application number 202010966401.8 and the name of the invention " A Filter and Radio Transceiver Device" of the Chinese Patent Application, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the field of electronic communication equipment, and in particular, to a filter and radio transceiver equipment.

Background technique

With the development of the mobile communication industry, there are more and more radio equipment in various frequency bands, which makes spectrum resources more and more scarce. Different systems need to work near frequency bands with similar frequencies, making radio equipment more vulnerable to other radio equipment in adjacent frequency bands. Therefore, it is necessary to use a filter with better out-of-band suppression and higher square coefficient to filter out the interference signal to ensure the normal operation of the radio equipment.

Traditionally, a sixth-order filter can generate up to four controllable cross-coupling zeros. As shown in Figure 1, the entire filter topology is an up-down symmetrical structure, in which the coupling devices K1, K2, K3, K4, and K5 are magnetic. Coupling, respectively connecting two adjacent resonators; cross-coupling device K6 for electrical coupling, connecting non-adjacent resonators R2 and R5; cross-coupling device K7 for magnetic coupling, connecting non-adjacent resonators R1 and R6; signal After entering the resonator R1 from the port P1 through the loading device C1, it is divided into three paths. The first transmission path passes through R1, R2, R2, R3, R4, R5, and R6 to reach the port P2; the second transmission path passes through the resonator R1, R2, R5, R6 arrive at port P2; the third transmission path passes through resonators R1, R6 and arrives at port P2. The resonators R2, R3, R4, R5 and the coupling devices K2, K3, K4, and K6 together form the first CQ coupling structure S1, which generates a transmission zero at the low frequency end and the high frequency end of the filter outside the passband; the resonator R1, R2, R5, R6 and the coupling devices K1, K5, K6, K7 together form a second CQ coupling structure S2, which generates a transmission zero at the low frequency end and the high frequency end of the filter outside the passband; as shown in Figure 2, the filter The converter topology produces a total of four transmission zeros.

Since the filter in Figure 1 is a symmetrical structure, when the filter port position is changed, the symmetry of the filter will be destroyed, so the filter topology in Figure 1 cannot be applied.

The general filter can be analyzed by using a coupled resonant circuit. The resonator in the filter can be equivalent to a parallel LC resonant circuit, which has the following transfer characteristics:

(1) Amplitude characteristics, for the signal at the resonant frequency point of the resonator all pass, the signal part of the non-resonant frequency point passes, and the more the frequency of the signal deviates from the resonant frequency point of the resonator, the less energy passes through the resonator.

(2) Phase characteristics: The signal whose frequency is lower than the resonant frequency of the resonator has a transmission phase of +90°, and the signal whose frequency is higher than the resonant frequency of the resonator has a transmission phase of -90°.

In addition, the magnetic coupling device, or the positive coupling device, or the inductive coupling device between the resonators can be equivalent to an inductive impedance converter whose transmission phase is -90°, and the electrical coupling device between the resonators, or The negative coupling device, or the capacitive coupling device, can be equivalent to a capacitive impedance transformer whose transmission phase is +90°.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the defects of the prior art, and to provide a filter with an asymmetric topology and four transmission zeros outside the passband, the filter has good out-of-band suppression and high squareness coefficient; the present invention also A radio transceiver having the filter is provided.

In order to achieve the above object, the technical solution provided by the present invention is a filter, the filter has an asymmetric topology, and the filter includes:

a resonator, the resonator includes a first resonator, a second resonator, a third resonator, a fourth resonator, a fifth resonator, and a sixth resonator;

a coupling device, the coupling device includes a first coupling device, a second coupling device, a third coupling device, a fourth coupling device, a fifth coupling device, a sixth coupling device, and a seventh coupling device, and every two of the resonators connected by one of the coupling means for realizing signal coupling between the two resonators;

a port, the port includes a first port and a second port, the first port is used for inputting/outputting signals to/from the filter, and the second port is used for outputting/outputting from the filter input a signal to the filter;

A port loading device, the port loading device is provided in a one-to-one correspondence with the ports, the port loading device includes a first port loading device and a second port loading device, and the first port and the first resonator pass through The first port loading device is coupled, and the second port and the sixth resonator are coupled through the second port loading device;

the third resonator, the fourth resonator, the fifth resonator, the sixth resonator, the third coupling device, the fourth coupling device, the fifth coupling device, the The sixth coupling device constitutes a first CQ coupling structure; the first resonator, the second resonator, the third resonator, the sixth resonator, the first coupling device, the first Two coupling devices, the sixth coupling device, and the seventh coupling device form a second CQ coupling structure; the first CQ coupling structure and the second CQ coupling structure share the sixth coupling device;

In the third coupling device, the fourth coupling device, the fifth coupling device and the sixth coupling device, the polarity or phase of any one of the coupling devices is the same as the polarity or phase of the other three coupling devices. The polarity or phase is opposite; in the first coupling device, the second coupling device, the sixth coupling device and the seventh coupling device, the polarity or phase of any one of the coupling devices is the same as that of the other three coupling devices. opposite polarity or phase;

The filter has four transmission zeros outside the passband, wherein two transmission zeros are located at the low frequency end outside the passband of the filter, and the other two transmission zeros are located at the high frequency end outside the passband of the filter.

Preferably, in the first CQ coupling structure, the third resonator and the fourth resonator are connected through the third coupling device, and the third resonator and the sixth resonator are connected The resonators are connected through the sixth coupling device, the fourth resonator and the fifth resonator are connected through the fourth coupling device, and the fifth resonator and the sixth resonator are connected The resonators are connected through the fifth coupling device; in the second CQ coupling structure, the first resonator and the second resonator are connected through the first coupling device, the The first resonator and the sixth resonator are connected through the seventh coupling device, the second resonator and the third resonator are connected through the second coupling device, the The third resonator and the sixth resonator are connected through the sixth coupling device.

Preferably, the polarity or phase of the sixth coupling device is the same as that of the first coupling device, the second coupling device, the third coupling device, the fourth coupling device, the fifth coupling device, The seventh coupling means are opposite in polarity or phase.

Preferably, the first coupling device, the second coupling device, the third coupling device, the fourth coupling device, the fifth coupling device, the sixth coupling device, the seventh coupling device The polarity of two coupling devices in the device is opposite to the polarity of the remaining five coupling devices, and the two coupling devices with opposite polarities or phases are located in the first CQ coupling structure S1 and the second coupling device respectively. CQ coupling structure S2; the two coupling devices with opposite polarities or phases are not located in the common sixth coupling device K6 of the first CQ coupling structure S1 and the second CQ coupling structure S2.

Preferably, the filter includes a dielectric filter, a coaxial cavity filter, a waveguide filter, and a microstrip filter.

Preferably, the coupling device includes a magnetic coupling device and an electric coupling device, a positive coupling device and a negative coupling device, an inductive coupling device and a capacitive coupling device; the magnetic coupling, positive coupling or inductive coupling are three of the coupling devices with the same principle The electrical coupling, negative coupling or capacitive coupling are three names of the coupling device with the same principle.

In another aspect, the present invention provides a second filter, the first port, the second port, the first CQ coupling structure, and the second CQ coupling structure, wherein the first CQ coupling structure includes a plurality of sequentially arranged and end-to-end resonators, each two adjacent resonators in the first CQ coupling structure are connected by a coupling device; the second CQ coupling structure includes a plurality of sequentially arranged and end-to-end resonators, the Every two adjacent resonators in the second CQ coupling structure are connected by a coupling device, and the coupling device is used to realize signal coupling between the two connected resonators;

The first CQ coupling structure and the second CQ coupling structure share two resonators and one coupling device, one of the coupling devices in the first CQ coupling structure is opposite in polarity or phase to the other coupling devices, and the first CQ coupling structure is opposite in polarity or phase. One of the coupling devices in the two CQ coupling structures is opposite in polarity or phase to the other coupling devices;

One of the first port and the second port is used as the signal input port or signal output port of the filter, and the other port is used as the signal output port or signal input port of the filter;

The first port is coupled and connected to one of the two shared resonators, the second port is coupled to a non-shared resonator, and the resonator connected to the first port is coupled to the first port. The two-port connected resonators are arranged adjacent to each other, so that the filter forms an asymmetric structure. Therefore, the filter in the present invention is not affected by the change of the port position, which facilitates the design and manufacture of the filter. The first CQ coupling structure and the second CQ coupling structure each form two transmission zeros outside the passband, one of which is located at (or close to) the low-frequency end, and the other is located at (close to) the high-frequency end. In conclusion, the filtering The filter has four transmission zeros outside the passband, two of which are located at the low frequency end outside the passband of the filter, and the other two transmission zeros are located at the high frequency end outside the passband of the filter, and the frequency of the transmission zeros and The amplitude is adjustable, thereby greatly improving the out-of-band rejection of the filter.

The asymmetric structure of the filter is due to the asymmetric arrangement of the first port and the second port. Preferably, the first CQ coupling structure and the second CQ coupling structure form a symmetrical structure, thereby enhancing the coupling performance of the filter.

The CQ coupling structure, the full name is Cascaded Quadruplet coupling structure, specifically, the first CQ coupling structure includes four resonators and four coupling devices, and the second CQ coupling structure includes four resonators and four coupling devices. Since the first CQ coupling structure and the second CQ coupling structure share two resonators and one coupling device, the filter only needs six resonators and seven coupling devices, which reduces the number of components and is more beneficial to The arrangement of resonators and coupling devices is designed in a small area.

Preferably, the four resonators of the first CQ coupling structure are arranged in a matrix, and the four resonators of the second CQ coupling structure are arranged in a matrix; the coupling devices connecting adjacent resonators are centrally arranged in the adjacent resonators Between them, a single CQ coupling structure forms a symmetrical structure, which further enhances the coupling performance of the filter.

Further, the filter further includes a first port loading device and a second port loading device, the first port is coupled and connected to the resonator in the first CQ coupling structure through the first port loading device, so The second port is coupled and connected to the resonator in the second CQ coupling structure through the second port loading device.

Preferably, the coupling device shared by the first CQ coupling structure and the second CQ coupling structure is opposite in polarity or phase to other coupling devices.

Optionally, two coupling devices in the coupling device of the filter are opposite in polarity or phase to other coupling devices, and the coupling device shared by the first CQ coupling structure and the second CQ coupling structure is the same as the two coupling devices. The polarity or phase of the coupling device is reversed.

Specifically, the filter includes one of a dielectric filter, a coaxial cavity filter, a waveguide filter, and a microstrip filter.

Specifically, the types of coupling devices with opposite polarities or phases include magnetic coupling and electrical coupling, positive coupling and negative coupling, and inductive coupling and capacitive coupling.

In order to achieve the above object, the technical solution provided by the present invention is that a radio transceiver device includes the filter according to any one of the above.

Due to the application of the above-mentioned technical solutions, the present invention has the following advantages compared with the prior art:

The filter provided by the present invention includes six resonators, seven coupling devices, ports for inputting and outputting signals, and port loading devices for connecting the ports and the filter. By making every four resonators and every four couplings The device constitutes a CQ coupling structure such that the filter includes two CQ coupling structures having two identical resonators and one identical coupling device, and in each CQ coupling structure, the polarity or phase of any one coupling device is determined by making the Contrary to the polarity or phase of the remaining three coupling devices, the technical effect of having four transmission zeros outside the passband is achieved when the filter is limited by the structure and must adopt an asymmetric topology, two of which are located in the filter. The frequency and amplitude of the transmission zeros are adjustable, which greatly improves the out-of-band rejection of the filter and facilitates the design and manufacture of the filter. The invention also provides a radio transceiver device with the filter.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments described in this application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is the filter topology structure diagram of the prior art;

Fig. 2 is the electrical performance diagram of the filter topology shown in Fig. 1;

Fig. 3 is the topological structure diagram of the preferred embodiment of filter in the present invention;

Fig. 4 is the electrical performance diagram of the filter topology shown in Fig. 3;

Fig. 5 lists the coupling polarity distribution that satisfies the condition in the topological structure of Embodiment 3 of the present invention;

FIG. 6 is the signal transmission phase change corresponding to the coupling polarity distribution in FIG. 5 .

detailed description

The technical solutions in the embodiments of the present utility model will be described in detail below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Example 1

As shown in FIG. 3 , the filter provided by the present invention has an asymmetric topology. The filter includes: six resonators, seven coupling devices, two ports and two port loading devices, wherein the six resonators are They are the first resonator R1, the second resonator R2, the third resonator R3, the fourth resonator R4, the fifth resonator R5, and the sixth resonator R6; the seven coupling devices are the first coupling device K1, The second coupling device K2, the third coupling device K3, the fourth coupling device K4, the fifth coupling device K5, the sixth coupling device K6, and the seventh coupling device K7, the two ends of each coupling device are respectively connected to two resonators connection, the coupling device is used to realize the signal coupling between the two resonators; the two ports are the first port P1 and the second port P2 respectively, and the first port P1 is used to input/output signals to/from the filter , the second port P2 is used to output/input signals from the filter, that is, one of the first port P1 and the second port P2 is used as the signal input port of the filter, and the other port is used as the signal of the filter. Output port; port loading devices are set in one-to-one correspondence with ports, and there are two port loading devices, namely the first port loading device C1 and the second port loading device C2, the first port P1 and the first resonator R1 pass through the first port The port loading device C1 is coupled, and the second port P2 and the sixth resonator R6 are coupled through the second port loading device C2.

The specific connection relationship between the resonator and the coupling device in this embodiment is shown in FIG. 3 , and the numbers of each resonator and the coupling device are only examples of this embodiment:

The third resonator R3 and the fourth resonator R4 are connected through a third coupling device K3, the third resonator R3 and the sixth resonator R6 are connected through a sixth coupling device K6, and the fourth resonator R4 and The fifth resonator R5 is connected through the fourth coupling device K4, and the fifth resonator R5 and the sixth resonator R6 are connected through the fifth coupling device K5; the first resonator R1 and the second resonator R2 are connected. are connected through the first coupling device K1, the first resonator R1 and the sixth resonator R6 are connected through the seventh coupling device K7, and the second resonator R2 and the third resonator R3 are connected through the second coupling device K2 is connected, and the third resonator R3 and the sixth resonator R6 are connected through a sixth coupling device K6.

Since the first port P1 is coupled with the first resonator R1 through the first port loading device C1, and the second port P2 is coupled with the sixth resonator R6 through the second port loading device C2, since the first port of the filter is connected to the The two ports are set asymmetrically. Therefore, the entire filter has an asymmetric structure, so that the filter is not affected by the position change of the ports, which facilitates the design and manufacture of the filter.

In summary, the third resonator R3, the third coupling device K3, the fourth resonator R4, the fourth coupling device K4, the fifth resonator R5, the fifth coupling device K5, the sixth resonator R6, and the sixth coupling device K6 The first CQ coupling structure S1 is formed by connecting end to end in sequence; the first resonator R1, the first coupling device K1, the second resonator R2, the second coupling device K2, the third resonator R3, the sixth coupling device K6, the sixth resonance The first CQ coupling structure S1 and the second CQ coupling structure S2 share the third resonator R3, the sixth resonator R6 and the sixth coupling device K6. . CQ coupling structure, the full name of Cascaded Quadruplet coupling structure, compared to two independent CQ coupling structures requiring a total of eight resonators and eight coupling devices, the filter in this embodiment only needs six resonators and seven couplings The device reduces the number of components used, and is more conducive to the arrangement and design of the resonator and the coupling device in a smaller area.

In this embodiment, the first CQ coupling structure and the second CQ coupling structure form a symmetrical structure, thereby enhancing the coupling performance of the filter. Specifically, as shown in FIG. 3 , in this embodiment, the four resonators of the first CQ coupling structure are arranged in a matrix, and the four resonators of the second CQ coupling structure are arranged in a matrix; The coupling device is centrally arranged between adjacent resonators, so that a single CQ coupling structure forms a symmetrical structure, which further enhances the coupling performance of the filter.

In the third coupling device K3, the fourth coupling device K4, the fifth coupling device K5 and the sixth coupling device K6, the polarity or phase of any one coupling device is opposite to the polarity or phase of the remaining three coupling devices; Among the first coupling device K1, the second coupling device K2, the sixth coupling device K6 and the seventh coupling device K7, the polarity or phase of any one coupling device is opposite to the polarity or phase of the other three coupling devices. In the selection, the polarity or phase of the coupling device shared by the first CQ coupling structure and the second CQ coupling structure is opposite to that of other coupling devices, that is, the polarity or phase of the sixth coupling device K6 is the same as that of the first coupling device K1 and the second coupling device. The means K2, the third coupling means K3, the fourth coupling means K4, the fifth coupling means K5, and the seventh coupling means K7 have opposite polarities or phases.

In this embodiment, the polarities of the coupling devices K1, K2, K3, K4, K5, and K7 are magnetic coupling, positive coupling, or inductive coupling, and the magnetic coupling, positive coupling or inductive coupling are coupling devices with the same principle of three names. The polarity of the coupling device K6 is electrical coupling, negative coupling, or capacitive coupling, and the electrical coupling, negative coupling or capacitive coupling are three names of coupling devices with the same principle. Wherein, the coupling device K6 in the first CQ coupling structure S1 has opposite polarities to the other three coupling devices K3, K4 and K5; the coupling device K6 is in the second CQ coupling structure S2, and the other three coupling devices K1, The polarities of K3 and K7 are opposite; that is, the first CQ coupling structure S1 and the second CQ coupling structure S2 share a coupling device K6 of opposite polarity.

In this embodiment, the signal is input into the filter from the first port P1, and after entering the first resonator R1 through the first port loading device C1, it is divided into three transmission paths: the first signal transmission path goes through K1-R2-K2 -R3-K3-R4-K4-R5-K5 arrives at resonator R6; the second signal path reaches resonator R6 after passing through K1-R2-K2-R3-K6; the third signal transmission path reaches resonance after passing through K7 device R6. After the three-way signals are superimposed at the resonator R6, they are output to the second port P2 through the second port loading device C2.

Table I

Specifically as shown in Table 1, when the signal lower than the passband frequency of the filter enters the filter, it passes through the first transmission path K1-R2-K2-R3-K3-R4-K4-R5-K5, and the phase changes in sequence during the process. -90°, +90°, -90°, +90°, -90°, +90°, -90°, +90°, -90°, final phase change equal to -90°; via second transmission path K1-R2-K2-R3-K6, the phase changes during the process are -90°, +90°, -90°, +90°, +90°, and the final phase change is equal to +90°; through the third transmission path K7 , the phase change is -90°. When the signal with a frequency lower than the passband frequency of the filter enters the filter, when the signal passing through the first transmission path and the signal passing through the second transmission path are superimposed at the resonator R6, the phase difference between the two signals is 180°. Instead, the signals cancel each other out at resonator R6, creating a transmission zero below the filter passband frequency. When the signal lower than the passband frequency of the filter enters the filter, when the signal passing through the second transmission path and the signal passing through the third transmission path are superimposed at the resonator R6, the phase difference between the two signals is 180°, and the phase difference is 180°. Instead, the signals cancel each other out at resonator R6, creating a transmission zero below the filter passband frequency. Therefore, after entering the filter, a signal with a frequency lower than the passband of the filter can generate two transmission zeros at the low frequency end outside the passband of the filter.

As shown in Table 1, when the signal higher than the passband frequency of the filter enters the filter, it passes through the first transmission path K1-R2-K2-R3-K3-R4-K4-R5-K5, and the phase changes during this process. The sequence is -90°, -90°, -90°, -90°, -90°, -90°, -90°, -90°, -90°, and the final phase change is equal to -810°, which is equal to -90 °; through the second transmission path K1-R2-K2-R3-K6, the phase changes in this process are -90°, -90°, -90°, -90°, +90°, and the final phase change is equal to -90°, -90°, -90°, -90°, +90° 270°, that is, +90°; through the third transmission path K7, the phase change is -90°. When the signal higher than the passband frequency of the filter enters the filter, when the signal passing through the first transmission path and the signal passing through the second transmission path are superimposed at the resonator R6, due to the phase difference of 180° between the two signals, the phase difference is 180°. Instead, the signals cancel each other out at resonator R6, creating a transmission zero above the filter passband frequency. When the signal higher than the passband frequency of the filter enters the filter, when the signal passing through the second transmission path and the signal passing through the third transmission path are superimposed at the resonator R6, due to the phase difference of 180° between the two signals, the phase difference is 180°. Instead, the signals cancel each other out at resonator R6, creating a transmission zero above the filter passband frequency. Therefore, after entering the filter, a signal with a frequency higher than the passband of the filter can generate two transmission zeros at the high frequency end outside the passband of the filter.

Therefore, the filter topology in this embodiment can generate four transmission zeros outside the passband, two of which are located at the low frequency end outside the passband of the filter, and the other two transmission zeros are located at the high frequency outside the passband of the filter. frequency end, as shown in Figure 4. The transmission zero point A and the transmission zero point B are generated by the first CQ coupling structure S1, and the amplitudes of the transmission zero point A and the transmission zero point B can be changed by adjusting the strength of the coupling device K6. The stronger the strength of the coupling device K6, the higher the amplitude of the transmission zero point A and the transmission zero point B, the closer to the filter passband frequency; the weaker the strength of the coupling device K6, the lower the amplitude of the transmission zero point A and the transmission zero point B, the farther away Filter passband frequency. Transmission zero C and transmission zero D are generated by the second CQ coupling structure S2. By adjusting the strength of coupling device K7, the amplitudes of transmission zero C and transmission zero D can be changed. The stronger the strength of the coupling device K7, the higher the amplitude of the transmission zero point C and the transmission zero point D, and the closer to the passband frequency of the filter; the weaker the strength of the coupling device K7, the lower the amplitude of the transmission zero point C and the transmission zero point D, the farther away Filter passband frequency.

Further, it should be noted that the filter is a double-ended reciprocal element, and the signal can be input into the filter from the second port P2, and then divided into three transmission paths after entering the sixth resonator R6 through the second port loading device C2. The first transmission path reaches the resonator R1 after passing through K5-R5-K4-R4-K3-R3-K2-R2-K1, and the second transmission path reaches the resonator R1 after passing through K6-R3-K2-R2-K1. The three transmission paths reach the resonator R1 after passing through K7. After the three-way signals are superimposed at the resonator R1, they are output to the first port P1 through the first port loading device C1. Because the three signal transmission paths are the same as before the input and output ports are exchanged, but the transmission directions are opposite, the phase difference generated by the signal transmission is the same as the calculated value in Table 1, and the filter transmission curve generated after the port exchange is the same as that in Figure 4. Four transmission zeros are generated, two transmission zeros are located at the low frequency end outside the passband of the filter, and two transmission zeros are located at the high frequency end outside the passband of the filter.

Embodiment 2

As shown in FIG. 3 , the topology structure of the second embodiment is basically the same as that of the first embodiment, the difference is that in the second embodiment, the polarities of the coupling devices K1, K2, K3, K4, K5, and K7 are electrical coupling, Either negative coupling or capacitive coupling, the polarity of the coupling device K6 is magnetic coupling, positive coupling, or inductive coupling. Wherein, the coupling device K6 is in the first CQ coupling structure S1, and the polarities of the coupling devices K3, K4, and K5 are opposite; the coupling device K6 is in the second CQ coupling structure S2, and the polarities of the coupling devices K1, K3, and K7 are opposite. On the contrary; that is, the first CQ coupling structure S1 and the second CQ coupling structure S2 share a coupling device K6 of opposite polarity.

In the second embodiment, the signal is input into the filter from the first port P1, and after entering the first resonator R1 through the first port loading device C1, it is divided into three transmission paths. The first transmission path reaches the resonator R6 after passing through K1-R2-K2-R3-K3-R4-K4-R5-K5, and the second transmission path reaches the resonator R6 after passing through K1-R2-K2-R3-K6. The three transmission paths reach the resonator R6 after passing through K7. After the three-way signals are superimposed at the resonator R6, they are output to the second port P2 through the second port loading device C2.

Table II

The phase changes of the three transmission paths are shown in Table 2. When the signal below the passband frequency of the filter enters the filter, it passes through the first transmission path K1—R2—K2—R3—K3—R4—K4—R5— K5, the phase changes during this process are +90°, +90°, +90°, +90°, +90°, +90°, +90°, +90°, +90°, and the final phase change is equal to +810°, which is equal to +90°; through the second transmission path K1-R2-K2-R3-K6, the phase changes during this process are +90°, +90°, +90°, +90°, - 90°, the final phase change is equal to +270°, which is equal to -90°; through the third transmission path K7, the phase change is +90°. When the signal with a frequency lower than the passband frequency of the filter enters the filter, when the signal passing through the first transmission path and the signal passing through the second transmission path are superimposed at the resonator R6, the phase difference between the two signals is 180°. Instead, the signals cancel each other out at resonator R6, creating a transmission zero below the filter passband frequency. When the signal lower than the passband frequency of the filter enters the filter, when the signal passing through the second transmission path and the signal passing through the third transmission path are superimposed at the resonator R6, the phase difference between the two signals is 180°, and the phase difference is 180°. Instead, the signals cancel each other out at resonator R6, creating a transmission zero below the filter passband frequency. Therefore, after entering the filter, a signal with a frequency lower than the passband of the filter can generate two transmission zeros at the low frequency end outside the passband of the filter.

As shown in Table 2, when the signal higher than the passband frequency of the filter enters the filter, it passes through the first transmission path K1-R2-K2-R3-K3-R4-K4-R5-K5, and the phase changes during this process. +90°, -90°, +90°, -90°, +90°, -90°, +90°, -90°, +90°, the final phase change is equal to +90°; via the second transmission The path K1-R2-K2-R3-K6, the phase changes during this process are +90°, -90°, +90°, -90°, -90°, and the final phase change is equal to -90°; Transmission path K7, the phase change is +90°. When the signal higher than the passband frequency of the filter enters the filter, when the signal passing through the first transmission path and the signal passing through the second transmission path are superimposed at the resonator R6, due to the phase difference of 180° between the two signals, the phase difference is 180°. Instead, the signals cancel each other out at resonator R6, creating a transmission zero above the filter passband frequency. When the signal higher than the passband frequency of the filter enters the filter, when the signal passing through the second transmission path and the signal passing through the third transmission path are superimposed at the resonator R6, due to the phase difference of 180° between the two signals, the phase difference is 180°. Instead, the signals cancel each other out at resonator R6, creating a transmission zero above the filter passband frequency. Therefore, after entering the filter, a signal with a frequency higher than the passband of the filter can generate two transmission zeros at the high frequency end outside the passband of the filter.

Therefore, the filter topology in this embodiment can generate four transmission zeros, two transmission zeros are located at the low frequency end outside the passband of the filter, and two transmission zeros are located at the high frequency end outside the passband of the filter, As shown in Figure 4.

Embodiment 3

As shown in FIG. 3 , the topology structure of the third embodiment is basically the same as that of the first embodiment, the difference is that in the third embodiment, the coupling devices K1, K2, K3, K4, K5, K6, and K7 have The polarities of the two coupling devices are opposite to the polarities of the remaining five coupling devices, and the coupling devices with opposite polarities or phases are respectively located in the first CQ coupling structure S1 and the second CQ coupling structure S2; the The coupling device with opposite polarity or phase is not located in the common sixth coupling device K6 of the first CQ coupling structure S1 and the second CQ coupling structure S2, that is, the coupling device with the opposite polarity to the remaining five coupling devices Two of K1, K2, K3, K4, K5, K7.

Figure 5 lists all 18 possible coupling polarity distributions that meet the above conditions, in which the "+" symbol indicates that the polarity of the coupling device belongs to magnetic coupling, positive coupling or inductive coupling. The magnetic coupling, positive coupling Or inductive coupling is the three titles of the coupling device with the same principle; the "-" symbol indicates that the polarity of the coupling device belongs to electrical coupling, negative coupling or capacitive coupling, and the electrical coupling, negative coupling or capacitive coupling is the coupling of the same principle Three names for the device. In Figure 5, N13, N14, N15, N23, N24, N25, N73, N74, N75 and P13, P14, P15, P23, P24, P25, P73, P74, P75 are the codes of each group of coupling polarity distribution. In FIG. 5, the first coupling device, the second coupling device, the third coupling device, the fourth coupling device, the fifth coupling device, the sixth coupling device, and the seventh coupling device are represented by K1, K2, K3, K4, K5 respectively. , K6, K7 said.

In this embodiment, the signal is input into the filter from the first port P1, and after entering the first resonator R1 through the first port loading device C1, it is divided into three transmission paths. The first transmission path reaches the resonator R6 after passing through K1-R2-K2-R3-K3-R4-K4-R5-K5, and the second transmission path reaches the resonator R6 after passing through K1-R2-K2-R3-K6. The three transmission paths reach the resonator R6 after passing through K7. After the three-way signals are superimposed at the resonator R6, they are output to the second port P2 through the second port loading device C2.

Figure 6 below lists the signal transmission phase changes under these 18 coupling polarity distributions. It can be seen from Figure 6 that when the signal below the passband frequency of the filter enters the filter and passes through the transmission path formed by any group of coupling polarities in Figure 6, the phase change of the second transmission path is the same as that of the first transmission path. The phase changes of the paths are opposite, and the phase difference is 180°; and the phase changes of the second transmission path are opposite to the phase changes of the third transmission path, and the phase difference is 180°. Therefore, two transmission zeros can be generated at the low frequency end outside the filter passband. When the signal higher than the passband frequency of the filter enters the filter, after passing through the transmission path formed by any group of coupling polarities in Fig. 6, the phase change of the second transmission path is opposite to the phase change of the first transmission path , the phase difference is 180°; and the phase change of the second transmission path is opposite to that of the third transmission path, and the phase difference is 180°. Therefore, two transmission zeros can be generated at the high frequency end outside the passband of the filter. Therefore, any combination of coupling polarities in Figure 6 can make the filter generate four transmission zeros, two of which are located at the low frequency end outside the filter passband, and two transmission zeros are located at the filter passband. Out-of-band high frequency side.

Further, by adjusting the strength of the coupling device K6, the amplitudes of the transmission zero point A and the transmission zero point B in FIG. 4 can be changed. By adjusting the strength of the coupling device K7, the amplitudes of the transmission zero point C and the transmission zero point D in FIG. 4 can be changed.

It should be noted that, in the above embodiments, the resonators R1, R2, R3, R4, R5, and R6 include dielectric filters, coaxial cavity filters, waveguide filters, and microstrip filters.

The present invention further provides a radio transceiver device, the radio transceiver device includes the filter provided by any one of the above embodiments.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The above are only specific embodiments of the present application. It should be pointed out that for those skilled in the art, without departing from the principles of the present application, several improvements and modifications can also be made. It should be regarded as the protection scope of this application.

Claims

A filter, the filter is an asymmetric topology, the filter comprises:

a resonator, the resonator includes a first resonator, a second resonator, a third resonator, a fourth resonator, a fifth resonator, and a sixth resonator;

a coupling device, the coupling device includes a first coupling device, a second coupling device, a third coupling device, a fourth coupling device, a fifth coupling device, a sixth coupling device, and a seventh coupling device, and every two of the resonators connected by one of the coupling means for realizing signal coupling between the two resonators;

a port, the port includes a first port and a second port, the first port is used for inputting/outputting signals to/from the filter, and the second port is used for outputting/outputting from the filter input a signal to the filter;

A port loading device, the port loading device is provided in a one-to-one correspondence with the ports, the port loading device includes a first port loading device and a second port loading device, and the first port and the first resonator pass through The first port loading device is coupled, and the second port and the sixth resonator are coupled through the second port loading device;

It is characterized by:

the third resonator, the fourth resonator, the fifth resonator, the sixth resonator, the third coupling device, the fourth coupling device, the fifth coupling device, the The sixth coupling device constitutes a first CQ coupling structure; the first resonator, the second resonator, the third resonator, the sixth resonator, the first coupling device, the first Two coupling devices, the sixth coupling device, and the seventh coupling device form a second CQ coupling structure; the first CQ coupling structure and the second CQ coupling structure share the sixth coupling device;

In the third coupling device, the fourth coupling device, the fifth coupling device and the sixth coupling device, the polarity or phase of any one of the coupling devices is the same as the polarity or phase of the other three coupling devices. The polarity or phase is opposite; in the first coupling device, the second coupling device, the sixth coupling device and the seventh coupling device, the polarity or phase of any one of the coupling devices is the same as that of the other three coupling devices. opposite polarity or phase;

The filter has four transmission zeros outside the passband, wherein two transmission zeros are located at the low frequency end outside the passband of the filter, and the other two transmission zeros are located at the high frequency end outside the passband of the filter.
The filter according to claim 1, wherein: in the first CQ coupling structure, the third resonator and the fourth resonator are connected through the third coupling device, so The third resonator and the sixth resonator are connected through the sixth coupling device, and the fourth resonator and the fifth resonator are connected through the fourth coupling device, so The fifth resonator and the sixth resonator are connected through the fifth coupling device; in the second CQ coupling structure, the first resonator and the second resonator are connected through The first coupling device is connected, the first resonator and the sixth resonator are connected through the seventh coupling device, and the second resonator and the third resonator are connected through The second coupling device is connected, and the third resonator and the sixth resonator are connected through the sixth coupling device.
The filter according to claim 1, wherein the polarity or phase of the sixth coupling device is the same as that of the first coupling device, the second coupling device, the third coupling device, the first coupling device, and the first coupling device. The polarity or phase of the four coupling devices, the fifth coupling device, and the seventh coupling device are opposite.
The filter according to claim 1, wherein: the first coupling device, the second coupling device, the third coupling device, the fourth coupling device, the fifth coupling device, the The polarities of two coupling devices in the sixth coupling device and the seventh coupling device are opposite to the polarities of the remaining five coupling devices, and the two coupling devices with opposite polarities or phases are located in the The first CQ coupling structure S1 and the second CQ coupling structure S2; the two coupling devices with opposite polarities or phases are not located between the first CQ coupling structure S1 and the second CQ coupling structure S2 Common sixth coupling means K6.
The filter according to claim 1, wherein the filter comprises a dielectric filter, a coaxial cavity filter, a waveguide filter, and a microstrip filter.
The filter according to claim 1, characterized in that: the coupling device comprises a magnetic coupling device and an electrical coupling device, a positive coupling device and a negative coupling device, an inductive coupling device and a capacitive coupling device; Or inductive coupling are three names for coupling devices with the same principle; the electrical coupling, negative coupling or capacitive coupling are three terms for coupling devices with the same principle.
A filter includes a first port, a second port, a first CQ coupling structure, and a second CQ coupling structure, wherein the first CQ coupling structure includes a plurality of resonators arranged in sequence and connected end to end, the first CQ coupling structure Every two adjacent resonators in a CQ coupling structure are connected by a coupling device; the second CQ coupling structure includes a plurality of resonators arranged in sequence and connected end to end, and every two phase resonators in the second CQ coupling structure Adjacent resonators are connected through a coupling device, and the coupling device is used to realize signal coupling between the two connected resonators;

It is characterized in that, the first CQ coupling structure and the second CQ coupling structure share two resonators and one coupling device, and one of the coupling devices in the first CQ coupling structure is opposite in polarity or phase to other coupling devices. , the polarity or phase of one of the coupling devices in the second CQ coupling structure is opposite to that of the other coupling devices;

One of the first port and the second port is used as the signal input port or signal output port of the filter, and the other port is used as the signal output port or signal input port of the filter;

The first port is coupled and connected to one of the two shared resonators, the second port is coupled to a non-shared resonator, and the resonator connected to the first port is coupled to the first port. The two-port connected resonators are arranged adjacent to each other so that the filter forms an asymmetric structure.
The filter according to claim 7, wherein the first CQ coupling structure and the second CQ coupling structure form a symmetrical structure.
8. The filter of claim 7, wherein the first CQ coupling structure includes four resonators and four coupling devices, and the second CQ coupling structure includes four resonators and four coupling devices.
The filter according to claim 9, wherein the four resonators of the first CQ coupling structure are arranged in a matrix, and the four resonators of the second CQ coupling structure are arranged in a matrix.
10. The filter according to claim 9, wherein the coupling means connecting adjacent resonators is centrally arranged between adjacent resonators.
The filter according to claim 7, wherein the filter has four transmission zeros outside the passband, wherein two transmission zeros are located at the low frequency end outside the passband of the filter, and the other two transmission zeros are located at The filter passes the out-of-band high frequency end.
The filter according to claim 7, further comprising a first port loading device and a second port loading device, the first port is connected to the first CQ coupling structure through the first port loading device The resonator is coupled and connected, and the second port is coupled and connected to the resonator in the second CQ coupling structure through the second port loading device.
The filter according to claim 7, wherein the coupling device shared by the first CQ coupling structure and the second CQ coupling structure is opposite in polarity or phase to other coupling devices.
The filter according to claim 7, wherein two of the coupling devices of the filter are opposite in polarity or phase to other coupling devices, and the first CQ coupling structure is connected to the second CQ coupling structure. The coupling means common to the coupling structure are of opposite polarity or phase to the two coupling means.
The filter according to claim 7, wherein the filter comprises one of a dielectric filter, a coaxial cavity filter, a waveguide filter, and a microstrip filter.
The filter according to claim 7, wherein the types of the coupling means with opposite polarity or phase include: magnetic coupling and electrical coupling, positive coupling and negative coupling, inductive coupling and capacitive coupling.
A radio transceiver, characterized by comprising the filter according to any one of claims 1 to 17.