A tunable single-ended-to-balanced filter in the form of a microstrip line
A technology of balanced filters and microstrip lines, which is applied to waveguide devices, circuits, electrical components, etc., and can solve problems such as complex passband adjustment methods
Active Publication Date: 2021-05-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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In the prior art, there are few literature reports on the reconfigurable dual passband single-ended to differential filter network, and the passband adjustment method is relatively complicated
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[0036] The present invention will be described in further detail below through specific implementation examples and in conjunction with the accompanying drawings.
[0037] Such as Figure 1-Figure 7 As shown, an adjustable single-ended to balanced filter in the form of a microstrip line includes a signal input terminal 1 and a plurality of resonator groups, and each resonator group is respectively coupled to the signal input terminal 1, and the resonator group There are two resonator groups, and the two resonator groups are centrally symmetrical.
[0038] Each resonator group at least includes an output port 2 and two ring resonators, and multiple bias voltage adjustment structures are arranged on the resonators. The two ring resonators are arranged symmetrically, and a coupling gap is left between the two resonators. One side of the ring resonator is provided with an odd-mode resonant opening.
[0039] A plurality of bias voltage adjustment structures respectively include ...
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The invention discloses an adjustable single-ended-to-balanced filter in the form of a microstrip line, comprising a signal input end and a plurality of resonator groups, each resonator group is respectively coupled to the signal input end, and each resonator group It includes at least an output port and two ring-shaped resonators, and a plurality of bias voltage adjustment structures are arranged on the resonators. The invention utilizes the odd-even mode resonant frequency of the ring resonator to realize double passband performance, utilizes varactor diodes to enable independent adjustment of the two passband frequencies, and simultaneously realizes the balun characteristic of the two passbands by changing the coupling between stages; A single-ended-to-balanced filter network with independent tunable bandwidth and pass-band frequency, and can eliminate a pass-band by changing the coupling between resonators and realize dual-pass-band single-ended-to-balanced filter to single-pass-band single-ended to balanced The conversion of the filter improves the flexibility of the existing balun filter network.
Description
technical field [0001] The invention relates to the technical field of wireless communication, in particular to an adjustable single-end to balanced filter in the form of a microstrip line. Background technique [0002] Baluns and filters are passive circuits commonly used in modern wireless communication networks. For example, in radio frequency transceivers, it is necessary to select the frequency of the received signal through a filter, and then use the balun to convert the received single-ended signal into Differential signal, which provides the input signal for the differential amplifier. Carrying out the research on the tunable balun filter network that combines the functions of balun and filter can effectively reduce the system volume and improve the integration and ease of use of the system. In the prior art, there are few literature reports on the reconfigurable dual passband single-ended to differential filter network, and the passband adjustment means are relativ...
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IPC IPC(8): H01P1/203
CPCH01P1/20381
Inventor 杨涛陈雄张希琳龙羽
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA