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Frequency tunable microstrip balanced bandpass filter

A filter, balanced band technology, applied in waveguide-type devices, electrical components, circuits, etc., can solve the problems of increasing design uncertainty, complex structure, etc., to achieve compact structure, reduce use, and achieve the effect of frequency tuning

Active Publication Date: 2019-03-26
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, for high selectivity and high common-mode rejection, the electrically tunable filters designed by many scholars can only achieve one of them, and most of them use a large number of lumped capacitors to achieve Q e Expected changes, resulting in complex structures and increased design uncertainty

Method used

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  • Frequency tunable microstrip balanced bandpass filter
  • Frequency tunable microstrip balanced bandpass filter
  • Frequency tunable microstrip balanced bandpass filter

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Embodiment Construction

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.

[0039] The present invention is described by taking the WLAN system working at a central frequency of 1.55 GHz as an example.

[0040] Such as figure 2 As shown, a frequency tunable microstrip balanced bandpass filter includes a dielectric substrate and two stepped impedance resonators 10 and four stepped impedance parallel coupled feeders 20 printed on the upper layer of the dielectric substrate.

[0041] Such as figure 1 As shown, the top of the dielectric substrate S1 is coated with an upper metal layer S2, and the two step impedance resonators 10 and the four step impedance parallel coupling feeders 20 are preferably printed on the upper metal layer.

[0042] The dielectric substrate S1 is preferably a PCB board with a relative permittivity of 3.55 and a thickness of 0.813 mm, and a PCB board of other specifications m...

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Abstract

The invention discloses a frequency tunable microstrip balanced bandpass filter which comprises two stepped impedance resonators and four stepped impedance parallel coupling feeders. Each of the stepped impedance resonators comprises low reactance lines, high reactance lines and varactor diodes. The low reactance lines include short low reactance lines and long low reactance lines. One end of eachof the high reactance lines is connected to regulation voltage, the other end is connected to a short low reactance line, the other end of the short low reactance line is connected to a long low reactance line through a varactor diode, and each of the stepped impedance parallel coupling feeders comprises a horizontal feeder and a vertical feeder. According to the invention, through the flexible and controllable hybrid electromagnetic coupling between the two resonators, the required coupling coefficient K12 is obtained. A desired external quality factor Qe can also be obtained by designing the stepped impedance parallel coupled feeders, and two differential mode transmission zeros near upper and lower passband edges are generated by hybrid coupling and source-to-load coupling. In addition, the high common mode rejection characteristic corresponding to a pass band remains stable.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a frequency tunable microstrip balanced bandpass filter. Background technique [0002] Noise effects play a critical role in the performance of most RF and microwave communication systems. Balanced filters are critical in communication systems as they play a key role in reducing interference, noise and crosstalk between the different components of the system. The balanced filter can make the differential mode have high selectivity to the desired frequency response, and the common mode is well suppressed in a wide frequency band, and has a strong ability to resist environmental noise. [0003] Most of the current balanced filters use electrically coupled resonator structures. Although high common-mode rejection can be achieved, the differential-mode response is selectively degraded. [0004] On the other hand, with the rapid development of wireless communication t...

Claims

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Application Information

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IPC IPC(8): H01P1/203
CPCH01P1/20381
Inventor 刘飞韩杨昆薛一凡孙亮邓宏伟
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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