Compact wideband band pass microstrip filter loaded by triangular split ring resonators

Int J RF Microw Comput Aided Eng

Chen²,

et al. 2018

In order to suppress the high level interference signals in the passband of a wideband communication system, a tunable bandpass filter with tunable transmission zeros in the pass band is presented in this letter. The tunable nested open ring resonator is operated to achieve the tunable transmission zeros in the tunable pass band. Adopting the nested open ring resonators, the passband and the transmission zeros can also be designed according to the demand independently. A tunable bandpass filter adopting five nested open ring resonators is designed, fabricated and measured. The tunable filter is tuning in the range of 400‐530 MHz. The 3 dB bandwidth of the tunable filter is in the range of 17‐18 MHz. The simulated results are in good agreement with the measured ones.

“…According to the discussion above, the input/output feed structure and the coupling structure between cavities can be designed similar to the traditional open rings filter …”

Section: The Design Of the Nested Open Ring Resonatormentioning

confidence: 99%

Section: The Design Of the Tunable Filtermentioning

confidence: 99%

Section: T He De Sig N Of Th E Nest Ed O P En Ri Ng Res On Ato Rmentioning

confidence: 99%

Section: T He De Sig N Of Th E Nest Ed O P En Ri Ng Res On Ato Rmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A compact tunable bandpass filter with tunable transmission zeros in the pass band adopting a nested open ring resonator

Int J RF Microw Comput Aided Eng

Chen²,

et al. 2018

A widely tunable bandpass filter adopting novel fully tunable resonators

Int J RF Microw Comput Aided Eng

Zhao²,

et al. 2018

A widely tunable bandpass filter adopting a novel fully tunable resonator is proposed in this letter. The fully tunable resonator is mainly consisted of an open ring, a frequency tuning structure, and a coupling tuning structure. Adopting the fully resonators, the center frequency, the input/output external Q value, and the coupling coefficients can be tuned at the same time. And the tuning range of a tunable filter adopting the novel fully tunable resonators can be expanded. The fully tunable resonators can be combined to achieve more excellent suppression performance. A widely tunable bandpass filter consisted of five fully tunable resonators with 86.5% frequency tuning range is designed, fabricated, and measured. The simulated results are in good agreement with the measured ones. K E Y W O R D S coupling tuning structure, fully tunable resonators, more excellent suppression, open ring, widely tunable filter

A fully tunable filter based on the improved tubular structure

Int J RF Mic Comp-Aid Eng

Gan³

et al. 2022

A fully tunable bandpass filter adopting a novel tubular type structure was presented in this letter. The fully tunable bandpass filter was mainly consisted of π type tunable resonators and coupling reactance. The π type tunable resonators were mainly consisted of step impedance lines and tunable capacitance.Adopting this scheme, the frequency and 3 dB bandwidth of the bandpass filter can all be tuned independently in certain range. This type of fully tunable bandpass filter has a better expansibility and can be easily designed to meet other performance in actual requirements.