Fully tunable filter design using tunable transformers and multiple mode resonators

Mao, Jinrong; Che, Wenquan; Choi, Wai‐Wa; Tam, Kam‐Weng; Xue, Quan

doi:10.1109/ieee-iws.2013.6616825

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…Generally, the fully tunable filters can be designed by adopting the resonators with special structures. The multiple mode resonators (MMRs) are a widely used method of fully tunable filter with widely tunable range [1–8], especially the transmission line resonators [1–4, 6–8] or rectangular ring resonators [5]. This method has the advantages of compact size and low cost.…”

Section: Introductionmentioning

confidence: 99%

A tunable open ring coupling structure and its application in fully tunable bandpass filter

Zhang

Zhao²,

2019

Int. J. Microw. Wireless Technol.

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This letter presents a novel tunable coupling structure to simplify the design complexity of the miniaturized fully tunable filter by using open ring and varactors. Based on the proposed novel tunable coupling structure, a fully tunable bandpass filter is implemented with independently tunable operating frequency and bandwidth. The tunable resonator and tunable coupling structure can be easily combined to improve Out-of-band suppression performance. The design procedure of a fully tunable bandpass filter consists of five tunable cavities and tunable coupling rings is also proposed. A prototype of the proposed fully tunable filter is built to verify the design experimentally. Good agreement between simulated and measured results is obtained.

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Section: Introductionmentioning

confidence: 99%

A tunable open ring coupling structure and its application in fully tunable bandpass filter

Zhang

Zhao²,

2019

Int. J. Microw. Wireless Technol.

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“…Fully tunable filter is a new type of microwave device with adjustable center frequency, bandwidth and transmission zero [1,2,3,4]. It represents the development trend and ideal state of tunable filter.…”

Section: Introductionmentioning

confidence: 99%

A high stability fully tunable filter with frequency, bandwidth and transmission zero tuning

Zhang

Zhu

Meng

et al. 2019

IEICE Electron. Express

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Based on the double folded 1/4 mode substrate integrated waveguide (DFQMSIW) resonator, a two-pole DFQMSIW tunable filter with frequency, bandwidth and transmission zeros tuning is proposed in this paper. In order to increase the stability of the filter, the constant bandwidth can be maintained by changing the coupling coefficient by two varactor diodes when tuning frequency and transmission zeros. The center frequency can be tuned in the range of 1.1 GHz-1.9 GHz, transmission zeros can be tuned from 1.41 GHz to 1.5 GHz with bandwidth unchanged, and bandwidth can be tuned from 120 MHz to 200 MHz. The insertion loss is about −1.3 dB to −3 dB.

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Design of trisection filter with reconfigurable center frequency and transmission zeros using evanescent‐mode cavity resonators

Lai

Yang

Ling

et al. 2021

Micro & Optical Tech Letters

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In this paper, a trisection filter with reconfigurable transmission zeros based on the evanescent‐mode cavity (EVA) resonators is proposed. The design incorporates three EVA resonators. The varactors are set between two EVA resonators. By controlling the varactor capacitance value, couplings can be switched between electrical coupling and magnetic coupling. Based on this technique, the resulting two zeros can be designed to the desired position. Furthermore, a novel method by analyzing the magnitude and phase of trisection filters is proposed. Using this method, the transmission zeros position can be determined quickly. Measurement shows that the filter covers a frequency range of 2.11–2.83 GHz. Two transmission zeros can be arbitrarily designed to the left or right sides of the passband. Good agreement is obtained between simulated and measured results.

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Fully tunable filter design using tunable transformers and multiple mode resonators

Cited by 5 publications

References 3 publications

A tunable open ring coupling structure and its application in fully tunable bandpass filter

A tunable open ring coupling structure and its application in fully tunable bandpass filter

A high stability fully tunable filter with frequency, bandwidth and transmission zero tuning

Design of trisection filter with reconfigurable center frequency and transmission zeros using evanescent‐mode cavity resonators

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