Frequency- and Bandwidth-Tunable Bandstop Filter Containing Variable Coupling Between Transmission Line and Resonator

Jeong, Soon Young; Lee, Juseop

doi:10.1109/tmtt.2017.2756963

Cited by 29 publications

(23 citation statements)

References 28 publications

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“…As it can be noted from this table, the proposed circuit is a good compromise when it comes to design a tunable stop-band filter that takes into account many parameters at the same time such as a constant rejection depth, compact size, low-consumption power etc. Moreover, it is worth noting that our filter topology is fully designed using microstrip technology which have the advantage of having a low cost, easy fabrication and implementation in various technologies and frequency bands, as well as reduced simulation cost over other technologies such as SIW one [16].…”

Section: Two-branches Tunable Bandstop Filtermentioning

confidence: 99%

“…Far from the traditional way to design a bandstop filter, a different approach based on channelised techniques can be used to generate bandstop filter response. Channelised filter techniques were mainly applied to designing bandpass filter applications [12][13][14] and very few research papers address the realisation of bandstop filters [15,16]. In [15], the potential of channelised notch filter techniques was largely demonstrated.…”

Section: Introductionmentioning

confidence: 99%

“…However, the frequency reconfiguration capability with a constant depth over the considered band and the high selectivity performances are obtained at the expense of (i) the number of circuit elements that increases the complexity and the circuit sensitivity and (ii) the use of active components such as amplifiers that may compromise the system linearity and increase the power consumption. Very recently, a paper, that seems to follow an approach similar to the one described here, was proposed in [16]. The filter topology is a hybrid integration that combines substrate integrated waveguide (SIW) resonator with a microstrip phase shifter (PS).…”

Section: Introductionmentioning

confidence: 99%

“…The circuit uses the same PS [17] as the one used in this paper but for a different utility. Indeed, the PS implemented in [16] is used as a bandwidth controller of the proposed bandstop filter. This use case differs from ours as the PS in our paper was calculated and designed to have the higher rejection possible while keeping a constant rejection depth over the tuning range.…”

Section: Introductionmentioning

confidence: 99%

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Tunable channelised bandstop passive filter using reconfigurable phase shifter

Lababidi

Shami

Roy

et al. 2019

IET Microwaves, Antennas & Propagation

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A novel tunable channelized two-branches passive bandstop filter using a reconfigurable parallel-coupled-line-based Phase Shifter (PS) is presented. The filter topology uses the signal destructive principle and aims to protect the receiver against an unwanted interference signal received by the antenna. The global filter topology contains two branches, each of which has a different function. The bandpass tunable branch selects the frequency to be rejected while the reconfigurable PS plays the signal invertor role. The simultaneous tunability of both bandpass and PS branches is ensured by using identical varactor diodes and features 550-700 MHz tuning range. In addition of having a constant and relatively high rejection level over all the tuning range and low insertion loss in the passband area, the filter guaranties ultra-low power consumption. Moreover, synthesis equations are proposed and used to illustrate the operating principle, and finally validated by comparing simulations results to measurements.

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Section: Two-branches Tunable Bandstop Filtermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tunable channelised bandstop passive filter using reconfigurable phase shifter

Lababidi

Shami

Roy

et al. 2019

IET Microwaves, Antennas & Propagation

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“…diodes [6], [7], micro-electromechanical system (MEMS) devices [8], [9], varactor diodes [10]- [13], complementary metal oxide semiconductors (CMOS) [14], etc. To enable a flexible stop center frequency, various BSFs were developed by adding microstrip resonators loaded with silicon varactor diodes [15]- [17].…”

Section: Introductionmentioning

confidence: 99%

Tunable Bandstop HMSIW Filter With Flexible Center Frequency and Bandwidth Using Liquid Crystal

Xu¹,

Zhang²,

Peng³

et al. 2019

IEEE Access

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This paper reports on a tunable bandstop filter (BSF) with both flexible center frequency and bandwidth. The tunable BSF is based on half-mode substrate integrated waveguide (HMSIW), of which the broadside is coupled with reconfigurable resonators. Using liquid crystal (LC) material as the substrate, a tunable stopband could be obtained by adjusting the bias voltage of the interdigitated microstrip resonator on LC. In order to increase the tunable range of stopband bandwidth, two additional open resonators are implemented at the broadside of HMSIW cavity. For practical validation, the bandstop HMSIW filter using LC is designed and fabricated. Numerical results demonstrate that,by adjusting the voltages of three resonators on LC, either the lower or the higher cutoff frequency could be controlled independently, leading to the flexible and independent tuning ranges of both center frequency from 4.9 to 5.4 GHz and 3-dB bandwidth of stopband from 1.2 to 1.8 GHz (@5.1 GHz). INDEX TERMS Bandstop filter (BSF), half-mode substrate integrated waveguide (HMSIW), liquid crystal (LC), tunable filter.

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