CN112671370B - Filter and radio transceiver - Google Patents
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
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Abstract
The filter provided by the invention comprises six resonators, seven coupling devices, ports for inputting and outputting signals and port loading devices for connecting the ports, wherein each four resonators and each four coupling devices form a coupling structure, so that the filter comprises two coupling structures with two identical resonators and one identical coupling device, and in each coupling structure, the polarity or phase of any coupling device is opposite to the polarity or phase of the other three coupling devices, so that the technical effect of having transmission zero points outside four pass bands when the filter is limited by the structure and the corresponding topological structure is needed is realized, wherein two of the transmission zero points are located at the low frequency band outside the pass band of the filter, and the other two transmission zero points are located at the high frequency band outside the pass band of the filter, thereby greatly improving the out-of-band rejection of the filter, facilitating the design and manufacture of the filter, ensuring that the port position is not fixed and the structure is flexible; the invention also provides a radio transceiver device with the filter.
Description
Technical Field
The present application relates to the field of electronic communications devices, and in particular, to a filter and a radio transceiver device.
Background
With the development of the mobile communication industry, more and more radio devices in various frequency bands are used, so that frequency spectrum resources are more and more scarce, and different systems need to work near the frequency bands with similar frequencies, so that the radio devices are more likely to be interfered by radio signals transmitted by other radio devices in adjacent frequency bands; therefore, a filter with better out-of-band rejection and higher rectangular coefficient is required to filter the interference signal so as to ensure the normal operation of the radio equipment.
Conventionally, a six-order filter can generate four controllable cross coupling zero points at most, as shown in fig. 1, the topology structure of the whole filter is an up-down symmetrical structure, wherein coupling devices K1, K2, K3, K4 and K5 are magnetic coupling and are respectively connected with two adjacent resonators; the cross coupling device K6 is electrically coupled and is used for connecting the non-adjacent resonators R2 and R5; the cross coupling device K7 is magnetic coupling and is used for connecting the non-adjacent resonators R1 and R6; after the signal enters the resonator R1 from the port P1 through the loading device C1, the signal is divided into three paths, and the first transmission path reaches the port P2 after passing through R1, R2, R2, R3, R4, R5 and R6; the second transmission path passes through the resonators R1, R2, R5, R6 and reaches the port P2; the third transmission path passes through the resonator R1, R6 and reaches the port P2. The resonators R2, R3, R4, R5 and the coupling devices K2, K3, K4, K6 together form a first coupling structure S1, and a transmission zero point is generated at the low-frequency end and the high-frequency end outside the passband of the filter respectively; the resonators R1, R2, R5, R6 and the coupling devices K1, K5, K6, K7 together form a second coupling structure S2, and a transmission zero point is generated at the low-frequency end and the high-frequency end outside the passband of the filter respectively; as shown in fig. 2, the filter topology produces a total of four transmission zeros.
However, when the position of the filter port is changed, the topology structure of the filter shown in fig. 1 cannot be applied, as shown in fig. 3, after the filter port is moved, the topology structure of the filter loses up-down or left-right symmetry, and only the resonators R3, R4, R5, R6 and the coupling devices K3, K4, K5, K6 together form a coupling structure S1, so that only a transmission zero point can be generated at the low frequency end and the high frequency end outside the filter passband; as shown in fig. 4, the filter topology can only generate two transmission zeros, the rectangular coefficient is reduced, and the out-of-band rejection capability is deteriorated.
As known from the disclosure of chinese patent CN200410101528.4, a general filter can be analyzed using a coupled resonant circuit. The resonator in the filter may be equivalently a parallel LC resonant circuit with the following transfer characteristics:
(1) The amplitude characteristic is such that, for all signals at the frequency point of the resonator, the signal portion at the non-resonant frequency point passes through, 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 with a frequency lower than the resonance frequency of the resonator has a transmission phase of +90°, the signal with a frequency higher than the resonance frequency of the resonator has a transmission phase of-90 °.
The magnetic coupling means, positive coupling means, or inductive coupling means between resonators may be equivalent to an inductive impedance transformer with a transmission phase of-90 °, and the electric coupling means, negative coupling means, or capacitive coupling means between resonators may be equivalent to a capacitive impedance transformer with a transmission phase of +90°.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a filter with variable port positions and four transmission zeros outside the band, wherein the filter has good out-of-band rejection and high rectangular coefficient; the invention also provides radio receiving and transmitting equipment with the filter.
In order to achieve the above object, the present invention provides a filter, including:
six resonators are respectively a first resonator, a second resonator, a third resonator, a fourth resonator, a fifth resonator and a sixth resonator;
The coupling device comprises 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, wherein every two resonators are connected through one coupling device, and the coupling device is used for realizing signal coupling between the two resonators;
a port including a first port for inputting/outputting a signal to/from the filter, and a second port for outputting/inputting a signal to/from the filter;
the port loading device is arranged in one-to-one correspondence with the ports and comprises a first port loading device and a second port loading device;
the first port is coupled to any one of the six resonators through the first port loading device, and the second port is coupled to any one of the remaining five resonators 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 and the sixth coupling device form a first coupling structure; the first resonator, the second resonator, the third resonator, the sixth resonator, the first coupling device, the second coupling device, the sixth coupling device and the seventh coupling device form a second coupling structure; the first coupling structure and the second coupling structure share the sixth coupling means;
Any one of the third coupling device, the fourth coupling device, the fifth coupling device and the sixth coupling device has a polarity or phase opposite to that of the other three coupling devices; any one of the first coupling device, the second coupling device, the sixth coupling device and the seventh coupling device has polarity or phase opposite to the polarity or phase of the other three coupling devices;
the filter is provided with four transmission zeros outside the pass band, wherein two transmission zeros are positioned at the low frequency end outside the pass band of the filter, and the other two transmission zeros are positioned at the high frequency end outside the pass band of the filter.
Preferably, in the first coupling structure, the third resonator and the fourth resonator are connected through the third coupling device, the third resonator and the sixth resonator 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 through the fifth coupling device; in the second coupling structure, the first resonator and the second resonator are connected through the first coupling device, 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, and the third resonator and the sixth resonator are connected through the sixth coupling device.
Preferably, the polarity or phase of the sixth coupling means is opposite to the polarity or phase of the first, second, third, fourth, fifth, seventh coupling means.
Preferably, two coupling devices among 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 have polarities opposite to those of the other five coupling devices, and the two coupling devices with opposite polarities or phases are respectively located in the first coupling structure S1 and the second coupling structure S2; the two coupling means of opposite polarity or phase are not located in a common sixth coupling means K6 of the first coupling structure S1 and the second coupling structure S2.
Preferably, the filter comprises a dielectric filter, a coaxial cavity filter, a waveguide filter and a microstrip filter.
Preferably, the coupling means comprises magnetic and electrical coupling means, positive and negative coupling means, inductive coupling means and capacitive coupling means; the magnetic coupling, the positive coupling or the inductive coupling are three kinds of names of coupling devices with the same principle; the electric coupling, the negative coupling or the capacitive coupling are three kinds of names of coupling devices with the same principle.
In order to achieve the above object, the present invention provides a radio transceiver device including a filter according to any one of the above.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
the filter provided by the invention comprises six resonators, seven coupling devices, ports for inputting and outputting signals and port loading devices for connecting the ports, wherein each four resonators and each four coupling devices form a coupling structure, so that the filter comprises two coupling structures with two identical resonators and one identical coupling device, and in each coupling structure, the polarity or phase of any coupling device is opposite to the polarity or phase of the other three coupling devices, so that the filter has the technical effect of having four transmission zeros outside the passband when the filter is limited by the shape and the port position and the corresponding topological structure is needed, wherein the two transmission zeros are positioned at the lower frequency band outside the passband of the filter, the other two transmission zeros are positioned at the upper frequency band outside the passband of the filter, and the frequency and the amplitude of the transmission zeros are adjustable, thereby greatly improving the out-of-band rejection of the filter, facilitating the design and the manufacture of the filter, ensuring the unfixed port position and flexible and changeable structure; the invention also provides a radio transceiver device with the filter.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
Fig. 1 is a prior art filter topology diagram.
Fig. 2 is an electrical performance diagram of the filter topology shown in fig. 1.
Fig. 3 is a topology diagram of the filter of fig. 1 after the port locations have been changed.
Fig. 4 is an electrical performance diagram of the filter topology shown in fig. 3.
Fig. 5 is a topology diagram of a first embodiment of a filter in the present invention.
Fig. 6 is an electrical performance diagram of the filter topology shown in fig. 5.
Fig. 7 is a topology diagram of a second embodiment of the filter of the present invention.
Fig. 8 is a topology diagram of a third embodiment of the filter of the present invention.
Detailed Description
The following detailed description of the technical solutions according to the embodiments of the present invention will be given with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 5, the filter provided by the present invention includes: six resonators, seven coupling devices, two ports and two port loading devices, wherein the six resonators are a first resonator R1, a second resonator R2, a third resonator R3, a fourth resonator R4, a fifth resonator R5 and a sixth resonator R6 respectively; the seven coupling devices are respectively a first coupling device K1, a second coupling device K2, a third coupling device K3, a fourth coupling device K4, a fifth coupling device K5, a sixth coupling device K6 and a seventh coupling device K7, every two resonators are connected through one coupling device, and the coupling devices are used for realizing signal coupling between the two resonators; the two ports are a first port P1 and a second port P2, wherein the first port P1 is used for inputting signals to and outputting signals from the filter, and the second port P2 is used for outputting signals from and inputting signals to the filter; the port loading devices are arranged in one-to-one correspondence with the ports, the two port loading devices are a first port loading device C1 and a second port loading device C2, the first port P1 and the first resonator R1 are coupled through the first port loading device C1, and the second port P2 and the fifth resonator R5 are coupled through the second port loading device C2.
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, the fourth resonator R4 and the fifth resonator R5 are connected through a fourth coupling device K4, and the fifth resonator R5 and the sixth resonator R6 are connected through a fifth coupling device K5; the first resonator R1 and the second resonator R2 are connected through a first coupling device K1, the first resonator R1 and the sixth resonator R6 are connected through a seventh coupling device K7, the second resonator R2 and the third resonator R3 are connected through a second coupling device K2, and the third resonator R3 and the sixth resonator R6 are connected through a sixth coupling device K6.
The third resonator R3, the fourth resonator R4, the fifth resonator R5, the sixth resonator R6, the third coupling device K3, the fourth coupling device K4, the fifth coupling device K5 and the sixth coupling device K6 form a first coupling structure S1; the first resonator R1, the second resonator R2, the third resonator R3, the sixth resonator R6, the first coupling device K1, the second coupling device K2, the sixth coupling device K6 and the seventh coupling device K7 form a second coupling structure S2; the first and second coupling structures S1 and S2 share a third resonator R3, a sixth resonator R6 and a sixth coupling means K6.
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 other three coupling devices; among the first, second, sixth and seventh coupling means K1, K2, K6 and K7, any one coupling means has a polarity or phase opposite to that of the other three coupling means.
The polarity or phase of the sixth coupling means K6 is opposite to the polarity or phase of the first coupling means K1, the second coupling means K2, the third coupling means K3, the fourth coupling means K4, the fifth coupling means K5, the seventh coupling means K7.
In this embodiment, the polarities of the coupling devices K1, K2, K3, K4, K5, K7 are magnetic coupling, positive coupling, or inductive coupling, which are three kinds of coupling devices with the same principle. The polarity of the coupling means K6 is an electrical coupling, or a negative coupling, or a capacitive coupling, which are three designations of coupling means of the same principle. Wherein the coupling device K6 is in the first coupling structure S1 opposite to the polarity of the remaining three coupling devices K3, K4, K5; the coupling device K6 is in the second coupling structure S2 opposite to the polarity of the remaining three coupling devices K1, K3, K7; that is, the first coupling structure S1 and the second 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, passes through the first port loading device C1, enters the first harmonic resonator R1, and is split into three transmission paths. The first path of transmission path reaches the resonator R5 after passing through K1-R2-K2-R3-K3-R4-K4, the second path of transmission path reaches the resonator R5 after passing through K1-R2-K2-R3-K6-R6-K5, and the third path of transmission path reaches the resonator R5 after passing through K7-R6-K5. After vector superposition of the three paths of signals at the resonator R5, the three paths of signals are output to the second port P2 through the second port loading device C2.
Specifically, after a signal with a frequency lower than the passband frequency of the filter enters the filter, the phase of the signal is changed to-90 degrees +90 degrees-90 degrees equal to-90 degrees after the signal passes through the first transmission path K1-R2-K2-R3-K3-R4-K4; after passing through the second transmission path K1-R2-K2-R3-K6-R6-K5, the phase is changed to-90 DEG +90 DEG equal to +90 DEG; after passing through the third transmission path K7-R6-K5, the phase change is-90 DEG +90 DEG-90 DEG equal to-90 deg. When the signal lower than the passband frequency of the filter enters the filter, and the signal passing through the first transmission path and the signal passing through the second transmission path are vector-superposed at the resonator R5, the signals cancel each other at the resonator R5 to form a transmission zero lower than the passband frequency of the filter due to 180 DEG of phase difference and opposite phase difference of the two signals; similarly, when the signal passing through the third transmission path is vector-superimposed with the signal passing through the second transmission path at the resonator R5, a transmission zero point lower than the passband frequency of the filter is also formed due to the 180 ° phase difference of the two signals. Thus, a signal below the pass band frequency of the filter, after entering the filter, can generate two transmission zeros at the low frequency end outside the pass band of the filter.
After a signal with a frequency higher than the passband frequency of the filter enters the filter, the phase is changed to-90 degrees-630 degrees, namely 90 degrees after passing through the first transmission path K1-R2-K2-R3-K3-R4-K4; after passing through the second transmission path K1-R2-K2-R3-K6-R6-K5, the phase is changed to-90 DEG +90 DEG-90 DEG equal to-450 DEG, namely equal to-90 DEG; after passing through the third transmission path K7-R6-K5, the phase change is-90 ° -90 ° -90 ° equal to-270 °, i.e. equal to +90°. When the signal higher than the passband frequency of the filter enters the filter, the signal passing through the first transmission path and the signal passing through the second transmission path are vector-superposed at the resonator R5, and the signals are mutually offset at the resonator R5 due to 180 DEG phase difference and opposite phase difference, so as to form a transmission zero point higher than the passband frequency of the filter; similarly, the signal passing through the third transmission path is vector-superimposed with the signal passing through the second transmission path at resonator R5, 180 ° out of phase, also forming a transmission zero above the passband frequency of the filter. Thus, a signal having a frequency higher than the passband of the filter, after entering the filter, can generate two transmission zeros at the high frequency side outside the passband of the filter.
Thus, the filter topology in this embodiment can generate transmission zeros outside four pass bands, where two transmission zeros are located at the low frequency end outside the pass band of the filter and the other two transmission zeros are located at the high frequency end outside the pass band of the filter, as shown in fig. 6.
Further, it should be noted that the filter is a double-ended reciprocal element, and the signal may be input into the filter from the second port P2, and then split into three transmission paths after entering the fifth harmonic resonator R5 through the second port loading device C2. The first path of transmission path reaches the resonator R1 after passing through K4-R4-K3-R3-K2-R2-K1, the second path of transmission path reaches the resonator R1 after passing through K5-R6-K6-R3-K2-R2-K1, and the third path of transmission path reaches the resonator R1 after passing through K5-R6-K7. After vector superposition of the three paths of signals at the resonator R1, the three paths of signals are output to the first port P1 through the first port loading device C1. Because the three signal transmission paths are the same as the input/output ports and have the same transmission directions and the same phase difference generated by signal transmission is the same as the calculated value, the transmission curve of the filter generated after the port interchange is the same as that of fig. 6, four transmission zeros can be generated, two transmission zeros are respectively positioned at the low frequency end outside the pass band of the filter, and two transmission zeros are positioned at the high frequency end outside the pass band of the filter.
Example two
As shown in fig. 7, in this embodiment, the position of the second port P2 is changed, and the second port P2 is coupled to the fourth resonator R4 through the loading device C2. In this embodiment, the polarity of the coupling devices K1, K2, K3, K4, K5, K7 is electric coupling, or negative coupling, or capacitive coupling, and the polarity of the coupling device K6 is magnetic coupling, or positive coupling, or inductive coupling. Wherein the coupling means K6 are of opposite polarity to the coupling means K3, K4, K5 in the first coupling structure S1; the coupling device K6 is in the second coupling structure S2 opposite to the polarity of the coupling devices K1, K2, K7; that is, the first coupling structure S1 and the second 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, enters the first harmonic resonator R1 through the first port loading device C1, and is split into three transmission paths. The first path of transmission path reaches the resonator R4 after passing through K1-R2-K2-R3-K3, the second path of transmission path reaches the resonator R4 after passing through K7-R6-K6-R3-K3, and the third path of transmission path reaches the resonator R4 after passing through K7-R6-K5-R5-K4. After vector superposition of the three paths of signals at the resonator R4, the three paths of signals are output to the second port P2 through the second port loading device C2.
The phase change conditions of the three transmission paths are as follows: after the signal below the passband frequency of the filter enters, the phase is changed to-90 degrees+90 degrees-90 degrees being equal to-90 degrees after passing through the first transmission path; after passing through the second transmission path, the phase change is-90 ° +90° +90 ° +90° equal to +90°; after passing through the third transmission path, the phase change is-90 DEG +90 DEG-90 DEG equal to-90 deg. When the signal lower than the passband frequency of the filter enters the filter, the signal passing through the first transmission path and the signal passing through the second transmission path are vector-superposed at the resonator R4, and the two signals cancel each other at the resonator R4 due to 180 DEG phase difference and opposite phase, so as to form a transmission zero lower than the passband frequency of the filter. When the signal lower than the passband frequency of the filter enters the filter, the signal passing through the second transmission path and the signal passing through the third transmission path are vector-superimposed at the resonator R4, and the two signals cancel each other out at the resonator R4 due to 180 DEG phase difference and opposite phase, so as to form a transmission zero lower than the passband frequency of the filter. Thus, a signal below the pass band frequency of the filter, after entering the filter, can generate two transmission zeros at the low frequency end outside the pass band of the filter.
After a signal with a frequency higher than the passband frequency of the filter enters the filter, the phase is changed to be-90 DEG to 90 DEG which is equal to-90 DEG after passing through the first transmission path; after passing through the second transmission path, the phase change is-90 ° -90 ° +90 ° -90 ° -90 ° equal to +90°; after passing through the third transmission path, the phase change is-90 ° -90 ° -90 ° -90 ° -90 ° equal to-90 °. When the signal above the passband frequency of the filter enters the filter, the signal passing through the first transmission path and the signal passing through the second transmission path are vector-superimposed at the resonator R4, and the two signals cancel each other out at the resonator R4 due to the 180 ° phase difference and opposite phases, so as to form a transmission zero above the passband frequency of the filter. When the signal above the passband frequency of the filter enters the filter, the signal passing through the second transmission path and the signal passing through the third transmission path are vector-superimposed at the resonator R4, and the two signals cancel each other out at the resonator R4 due to the 180 ° phase difference and opposite phases, forming a transmission zero above the passband frequency of the filter. Thus, a signal above the pass band frequency of the filter, after entering the filter, can generate two transmission zeros at the high frequency end outside the pass band of the filter.
Thus, the filter topology in this embodiment may generate four transmission zeros, two transmission zeros being located at the low frequency end outside the passband of the filter and two transmission zeros being located at the high frequency end outside the passband of the filter, as shown in fig. 6.
Example III
As shown in fig. 8, in this embodiment, the position of the second port P2 is changed, and the second port P2 is connected to the third resonator R3 through the loading device C2. In this embodiment, the polarities of the coupling devices K1, K2, K3, K4, K5, K7 are electric coupling, negative coupling, or capacitive coupling, and the polarity of the coupling device K6 is magnetic coupling, positive coupling, or inductive coupling. Wherein the coupling means K6 are of opposite polarity to the coupling means K3, K4, K5 in the first coupling structure S1; the coupling device K6 is in the second coupling structure S2 opposite to the polarity of the coupling devices K1, K2, K7; that is, the first coupling structure S1 and the second 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, passes through the first port loading device C1, enters the first harmonic resonator R1, and is split into three transmission paths. The first path of transmission path reaches resonator R3 after passing through K1-R2-K2, the second path of transmission path reaches resonator R3 after passing through K7-R6-K6, and the third path of transmission path reaches resonator R3 after passing through K7-R6-K5-R5-K4-R4-K3. After vector superposition of the three paths of signals at the resonator R3, the three paths of signals are output to the second port P2 through the second port loading device C2.
The phase change conditions of the three transmission paths are as follows: after the signal below the passband frequency of the filter enters, the phase is changed to-90 degrees+90 degrees-90 degrees to-90 degrees after passing through the first transmission path; after passing through the second transmission path, the phase change is-90 ° +90° equal to +90°; after passing through the third transmission path, the phase change is-90 DEG +90 DEG-90 DEG equal to-90 deg. When the signal lower than the passband frequency of the filter enters the filter, the signal passing through the first transmission path and the signal passing through the second transmission path are vector-superposed at the resonator R3, and the two signals cancel each other at the resonator R3 due to 180 DEG phase difference and opposite phase, so as to form a transmission zero lower than the passband frequency of the filter. When the signal lower than the passband frequency of the filter enters the filter, the signal passing through the second transmission path and the signal passing through the third transmission path are vector-superimposed at the resonator R3, and the two signals cancel each other out at the resonator R3 due to 180 DEG phase difference and opposite phase, so as to form a transmission zero lower than the passband frequency of the filter. Thus, a signal below the pass band frequency of the filter, after entering the filter, can generate two transmission zeros at the low frequency end outside the pass band of the filter.
After the signal with the frequency higher than the passband frequency of the filter enters, the phase is changed to be-90 degrees to 90 degrees which is equal to +90 degrees after passing through the first transmission path; after passing through the second transmission path, the phase change is-90 ° -90 ° +90° equal to-90 °; after passing through the third transmission path, the phase change is-90 ° -90 ° -90 ° -90 ° -90 ° -90 ° -90 ° equal to-630 °, i.e., +90°. When the signal above the passband frequency of the filter enters the filter, the signal passing through the first transmission path and the signal passing through the second transmission path are vector-superimposed at the resonator R3, and the two signals cancel each other out at the resonator R3 due to the 180 ° phase difference and opposite phases, so as to form a transmission zero above the passband frequency of the filter. When the signal above the passband frequency of the filter enters the filter, the signal passing through the second transmission path and the signal passing through the third transmission path are vector-superimposed at the resonator R3, and the signals cancel each other out at the resonator R3 due to the 180 ° phase difference of the two signals, thereby forming a transmission zero above the passband frequency of the filter. Thus, a signal above the pass band frequency of the filter, after entering the filter, can generate two transmission zeros at the high frequency end outside the pass band of the filter.
Thus, the filter topology in this embodiment may generate four transmission zeros, two transmission zeros being located at the low frequency end outside the passband of the filter and two transmission zeros being located at the high frequency end outside the passband of the filter, as shown in fig. 6.
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 invention also provides a radio transceiver device comprising the filter provided by any one of the embodiments.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely illustrative of the embodiments of this application and it will be appreciated by those skilled in the art that variations and modifications may be made without departing from the principles of the application, and it is intended to cover all modifications and variations as fall within the scope of the application.
Claims (2)
1. A filter, the filter comprising:
six resonators are respectively a first resonator, a second resonator, a third resonator, a fourth resonator, a fifth resonator and a sixth resonator;
The coupling device comprises 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, wherein every two resonators are connected through one coupling device, and the coupling device is used for realizing signal coupling between the two resonators;
a port including a first port for inputting/outputting a signal to/from the filter, and a second port for outputting/inputting a signal to/from the filter;
the port loading device is arranged in one-to-one correspondence with the ports and comprises a first port loading device and a second port loading device;
The method is characterized in that:
The first port is coupled to any one of the six resonators through the first port loading device, and the second port is coupled to any one of the remaining five resonators 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 and the sixth coupling device form a first coupling structure; the first resonator, the second resonator, the third resonator, the sixth resonator, the first coupling device, the second coupling device, the sixth coupling device and the seventh coupling device form a second coupling structure; the first coupling structure and the second coupling structure share the sixth coupling means;
Any one of the third coupling device, the fourth coupling device, the fifth coupling device and the sixth coupling device has a polarity or phase opposite to that of the other three coupling devices; any one of the first coupling device, the second coupling device, the sixth coupling device and the seventh coupling device has polarity or phase opposite to the polarity or phase of the other three coupling devices;
The filter is provided with four transmission zeros outside the passband of the filter, wherein two transmission zeros are positioned at the low frequency end outside the passband of the filter, and the other two transmission zeros are positioned at the high frequency end outside the passband of the filter;
In the first coupling structure, the third resonator and the fourth resonator are connected through the third coupling device, the third resonator and the sixth resonator 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 through the fifth coupling device; in the second coupling structure, the first resonator and the second resonator are connected through the first coupling device, 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, and the third resonator and the sixth resonator are connected through the sixth coupling device;
the polarity or phase of the sixth coupling means is opposite to the polarity or phase of the first coupling means, the second coupling means, the third coupling means, the fourth coupling means, the fifth coupling means, the seventh coupling means;
Two coupling devices among 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 have polarities opposite to those of the other five coupling devices, and the two coupling devices with opposite polarities or phases are respectively positioned in the first coupling structure and the second coupling structure; the two coupling means of opposite polarity or phase are not located in a common sixth coupling means of the first coupling structure and the second coupling structure.
2. A radio transceiver device characterized by: comprising a filter according to claim 1.
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| CN202010913834 | 2020-09-03 | ||
| CN2020109138347 | 2020-09-03 |
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| CN202022018826.4U Active CN212342781U (en) | 2020-09-03 | 2020-09-15 | Filter and radio transceiver |
| CN202010966401.8A Pending CN112072226A (en) | 2020-09-03 | 2020-09-15 | Filter and radio transceiver |
| CN202011500534.2A Active CN112671370B (en) | 2020-09-03 | 2020-12-18 | Filter and radio transceiver |
| CN202023079350.1U Active CN213783265U (en) | 2020-09-03 | 2020-12-18 | Filter and radio transceiver |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797842A (en) * | 2004-12-21 | 2006-07-05 | 华为技术有限公司 | Band-pass filter with transmission zero |
| CN105304982A (en) * | 2015-11-20 | 2016-02-03 | 南京理工大学 | Tapped feed dual-mode Balun band-pass filter |
| CN111244589A (en) * | 2020-02-24 | 2020-06-05 | 江苏灿勤科技股份有限公司 | Dielectric filter and radio transceiver |
| CN112072226A (en) * | 2020-09-03 | 2020-12-11 | 江苏灿勤科技股份有限公司 | Filter and radio transceiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100577006B1 (en) * | 2003-12-24 | 2006-05-10 | 한국전자통신연구원 | Microstrip cross coupled bandpass filters with asymmetric frequency characteristics |
| CN107017453A (en) * | 2017-03-10 | 2017-08-04 | 西南交通大学 | Coupled structure and its variable band-pass filter based on all-wave length tunable resonator |
| CN209691912U (en) * | 2018-12-31 | 2019-11-26 | 深圳市大富科技股份有限公司 | A kind of duplexer and communication equipment |
| CN109713414B (en) * | 2019-03-01 | 2023-11-21 | 江苏德是和通信科技有限公司 | Frequency modulation band-pass filter with adjustable limited transmission zero position |
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2020
- 2020-09-15 CN CN202022018826.4U patent/CN212342781U/en active Active
- 2020-09-15 CN CN202010966401.8A patent/CN112072226A/en active Pending
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797842A (en) * | 2004-12-21 | 2006-07-05 | 华为技术有限公司 | Band-pass filter with transmission zero |
| CN105304982A (en) * | 2015-11-20 | 2016-02-03 | 南京理工大学 | Tapped feed dual-mode Balun band-pass filter |
| CN111244589A (en) * | 2020-02-24 | 2020-06-05 | 江苏灿勤科技股份有限公司 | Dielectric filter and radio transceiver |
| CN112072226A (en) * | 2020-09-03 | 2020-12-11 | 江苏灿勤科技股份有限公司 | Filter and radio transceiver |
| CN213783265U (en) * | 2020-09-03 | 2021-07-23 | 江苏灿勤科技股份有限公司 | Filter and radio transceiver |
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| Publication number | Publication date |
|---|---|
| CN213783265U (en) | 2021-07-23 |
| CN212342781U (en) | 2021-01-12 |
| CN112072226A (en) | 2020-12-11 |
| WO2022048130A1 (en) | 2022-03-10 |
| CN112671370A (en) | 2021-04-16 |
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