Design of tunable dual-band filter with multiple types of resonators

Cheng, Y.-H.; Peng, Han-Sam; Chiang, Yuan‐Cheng

doi:10.1109/eumc.2015.7345788

Cited by 8 publications

(8 citation statements)

References 8 publications

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“…Therefore, the bandpass filter with transmission zeros in the passband has attracted a lot of attentions. And in order to operate in a wider frequency range, the tunable bandpass filter with a tunable transmission zero in the pass band was attracted more attentions …”

Section: Introductionmentioning

confidence: 99%

“…And in order to operate in a wider frequency range, the tunable bandpass filter with a tunable transmission zero in the pass band was attracted more attentions. [1][2][3][4][5][6][7][8][9][10][11] There are mainly three methods to realize a tunable bandpass filter with tunable transmission zeros in the pass band. Firstly, the combination of a bandpass filter and a bandstop filter can achieve this performance.…”

Section: Introductionmentioning

confidence: 99%

“…Thirdly, the adopting of some particularly resonators can also achieve this performance. [6][7][8][9][10][11] This method has the advantage of compact size. But it is difficult to achieve the performance of the pass band and transmission zeros independently, and also difficult to achieve a tunable filter.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

Chen²,

et al. 2018

Int J RF Microw Comput Aided Eng

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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.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Zhang

Chen²,

et al. 2018

Int J RF Microw Comput Aided Eng

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“…It is shown in that the dual‐band filter composed of ring and lumped resonant structures can provide quite good flexibility for achieving the low insertion losses of dual passbands and four transmission zeros beside the passbands. For eliminating the possible interference to the channels at other output, a new structure, which is so called the embedding impedance transformer, will be proposed.…”

Section: Introductionmentioning

confidence: 99%

Design of quad-channel diplexer adopting channel filters with impedance transformers

Peng

Cheng

Chiang

2017

Microw. Opt. Technol. Lett.

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A microstrip diplexer that uses different types of resonant structures to exhibit four channels at two different outputs is presented in this paper. A procedure for synthesizing the diplexer with two dual‐band filters having the required passband characteristics is also proposed. To reduce the interference between the filters at different outputs, the original structures of the dual‐band filters are modified by inserting embedded impedance transformers at the inputs of the lumped‐element resonators in the filters. Another component, working as an inductive compensation, is connected to the common input port to achieve the desired quad‐channel characteristics when the filters with embedded impedance transformers cannot eliminate the interference between the channel filters. To verify the proposed design method, an experimental prototype with four channels located in commonly used wireless communication bands is fabricated on a commercial printed circuit board substrate. The diplexer is highly compact; the measured insertion losses of all passbands are <2.8 dB and the associated return losses are >15 dB in the desired passbands. The isolations between the four passbands of the two outputs are all >30 dB. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:883–888, 2017

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“…Following the equations proposed in [8], the perturbation capacitance C p can be obtained by (4) Where w represents the bandwidth of the filter and g 1 and g 2 are the element values of the low pass prototype of the Chebyshev filter. With the even-and odd-mode analysis method, the following equations are developed to determine resonant frequency (f r ) of the ring resonator and corresponded values of C f and C p of the dual-mode filter, as follows [9] ]…”

Section: Introductionmentioning

confidence: 99%

Design of microstrip diplexer constructed with step impedance resonance ring structures

Chiang

Peng

2014

2014 International Symposium on Next-Generation Electronics (ISNE)

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A microstrip diplexer consisting of dual-mode ring filters with different feeding locations and sectional SIR ring structure is presented in this paper. The new feature of ring filter consisting of sectional step impedance resonators, of which the feeding capacitors are placed at appropriate locations to achieve the transmission zeros close to the desired frequency points, is proposed. The new type of the ring filter is not only compact in size, but it also can eliminate the superior responses of the conventional ring filter. By connecting one input of two ring filters with the quarter-wave transformer, a microstrip diplexer can be realized without altering the original filter characteristics. The experimental diplexer with two passbands is 3.6GHz and 5.0GHz.The measured insertion losses in the pass bands are less than 1.6 and 1.6dB, respectively. The isolation between two passbands is greater than 30dB and the input return losses of two passbands are about 20dB.

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Design of tunable dual-band filter with multiple types of resonators

Cited by 8 publications

References 8 publications

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

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

Design of quad-channel diplexer adopting channel filters with impedance transformers

Design of microstrip diplexer constructed with step impedance resonance ring structures

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