C-Band Iris Coupled Cavity Bandpass Filter

Soi, Shashank; Singh, Sushil Kumar; Singh, Rajendra; Kumar, Ashok

doi:10.1109/spcom55316.2022.9840777

Cited by 2 publications

(1 citation statement)

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“…Different topologies correspond to completely different numbers and structures of transmission zeros, and therefore the performance of the designed filters varies greatly. According to the theoretical literature related to the design of transmission zeros for generalized Chebyshev filters [16][17][18][19][20], two couplings with different polarities are introduced: cross-electric coupling and cross-magnetic coupling. By introducing cross-coupling, two transmission zeros outside the upper and lower passband, respectively, can be obtained, , which helps to improve the out-of-band rejection.…”

Section: Design Principle Of Cavity Filtermentioning

confidence: 99%

Design of a New Capacitive Load Cross-Coupled Cavity Filter

Wang

et al. 2022

Electronics

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This paper presents a new design method for a capacitor-loaded cross-coupled cavity filter, which significantly increases the power capacity of the cavity filter while improving out-of-band rejection. The filter uses a coaxial resonator at the open end of the donut capacitive-load. A triangular form of cavity structure is used for the full-cavity arrangement to reduce the size of the filter. In order to validate the design, a filter with a center frequency of 2.08 GHz and bandwidth of 80 MHz was designed, processed, and tested. The measured insertion loss was ≤0.97 dB, and the return loss was >20 dB in the range of 2040 MHz to 2120 MHz; the rejection was as high as 80 dB, and in-band ripple was 0.06 dB in the upper and lower stopband-range, which was only 30 MHz away from the sideband. After a simulation of the model using HFSS software (HFSS 2021, Canonsburg, PA, USA), the measured results matched the simulation results, which verified the correctness and practicality of the design. Compared with the ordinary-disc-load resonant cavity, the new donut capacitively loaded cavity-bandpass-filter has a 13.2% reduction in height and a 29.7% increase in power capacity.

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