Compact Lowpass and Dual-Band Bandpass Filter With Controllable Transmission Zero/Center Frequencies/Passband Bandwidth

Choudhary, Dilip Kumar; Chaudhary, Raghvendra Kumar

doi:10.1109/tcsii.2019.2931446

Cited by 35 publications

(19 citation statements)

References 20 publications

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“…Developments in multi-band microwave filters have recently gained more attention for a multi-services wireless communication system with miniaturized size, high selectivity and low value of insertion loss. 1 Recently, some works have been reported for multi-band bandpass filters (BPFs) such as dual-band filters, [2][3][4] triple-band filters [5][6][7] and quad-band filters. [8][9][10][11][12] In Reference 2, dualband BPF has been developed using CSRR and IDC with coplanar waveguide feeding technique.…”

Section: Introductionmentioning

confidence: 99%

Miniaturized quad‐band filter with improved selectivity using split ring resonators and metallic strips

Choudhary

Chaudhary

2021

Int J RF Microw Comput Aided Eng

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A miniaturized bandpass filter of quad-band response with high selectivity is reported in this paper. The developed filter utilizes two sets of symmetric open-ended split-ring resonators (SRR), L-shaped and C-shaped strips along with rectangular stubs. Initially, open-ended SRR is connected with a C-shaped metallic strip to serves as a dual passband filter. Then by adding another SRR along with L-shape metallic strip and rectangular stub, it was converted into triple band and quad-band respectively. The operating frequency of the proposed filter structure can be controlled with the variation in the length ratio of resonators. In addition, transmission zero can be increased because of coupling between source/load and resonators which improves selectivity. The quadband bandpass filter operates at 0.6/1.1/2.25/3.1 GHz, along with 3-dB fractional bandwidths of 17.9% (0.56-0.67 GHz), 17.7% (1.03-1.23 GHz), 5.8%(2.20-2.33 GHz), and 13.3% . It offers compactness with an electrical footprint area of 0.11λ g Â 0.10λ g (23.5 mm Â 21.0 mm) without feedline, where λ g denotes the guided wavelength at 0.6 GHz. The measured and simulated outcomes were in virtuous correlation.

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Section: Introductionmentioning

confidence: 99%

Miniaturized quad‐band filter with improved selectivity using split ring resonators and metallic strips

Choudhary

Chaudhary

2021

Int J RF Microw Comput Aided Eng

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“…e research on filters is presented in a recently published work. Compact low-pass and dual-band band-pass filters with controllable transmission zero/center frequency/ passband bandwidth are proposed in [16]. e position of transmission zeros/center frequencies and 3 dB bandwidth characteristics can be separately controlled by varying the physical parameter of the designed filter structure.…”

Section: Introductionmentioning

confidence: 99%

A Novel Band-Stop Filter with Band-Pass, High-Pass, and Low-Pass Negative Group Delay Characteristics

Yuan

Fang

Wang

et al. 2021

International Journal of Antennas and Propagation

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A band-stop filter with three different negative group delay functions in the passband, namely, band pass, high pass and low pass, is proposed, which has small insertion loss. The capacitance, inductance, and resistance meet different conditions, and the circuit can realize three different negative group delay characteristics. The theoretical calculation and equation derivation are given. A band-stop filter with negative group delay function is fabricated, and the measured results are basically consistent with the simulation results. The correctness of the design is verified.

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“…Split rings and split ring slots have been used to develop tunable microwave circuits [28,29], compact metamaterial structures [30,31], as well as single band tunable FSSs [32]. Also, concentric split ring slots have been used to obtain a tunable dual-band AFSS.…”

Section: Introductionmentioning

confidence: 99%

Independently Tunable Closely Spaced Triband Frequency Selective Surface Unit Cell Using the Third Resonant Mode of Split Ring Slots

et al. 2021

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In this paper, a tunable triband frequency selective surface unit cell based on varactor-loaded split ring slots is presented. By using the third resonant mode, a considerable mutual coupling reduction between adjacent ring slots is obtained ensuring both close band response as well as independent band tuning. Simulated results show the tunable properties of the proposed approach by shifting the three passbands resonant frequencies from 8.368, 10.276, and 12.010 GHz (for the unloaded split ring slots), to 7.732, 9.202, and 10.900 GHz, respectively, when each split ring slot is loaded with a capacitance of 140 fF. Furthermore, the metal shorts that split the ring slots as well as the metal rings located in between the slots are used to build the conducting paths to bias each varactor with minimum disruption in the RF response. A demonstrator based on an X-band diaphragm was designed, fabricated, and experimentally tested. Measured results using a varactor with capacitance range of 30-65 fF show resonant frequencies for the unbiased varactors at 8.53, 9.70 and 11.47 GHz with insertion loss of 1.1, 2.3 and 2.4 dB, respectively, while biasing the diodes at maximum reverse voltages (24 V) provides resonant frequencies at 8.74, 10.03 and 11.77 GHz with insertion loss of 0.8, 1.4 and 1.7 dB, respectively. Frequency shifts of 210, 330 and 300 MHz for the first, second and third resonant frequencies were obtained, respectively. The -10 dB reflection coefficient bandwidths were 495 MHz for the first band, 436 MHz for the second band and 418 MHz for the third band. Close band response is verified obtaining frequency band ratios of 1.18 and 1.14 for the third to the second resonance, and for the second to the first resonance, respectively.INDEX TERMS Frequency selective surfaces, split ring resonators, mutual coupling. communication systems or radar applications. Therefore, AFSSs are an attractive solution to enhance flexibility, security, and efficiency of the upcoming generations of wireless communication systems [3][4][5][6][7].Recently, multiband FSSs have been developed by virtue of their versatility in multifrequency/multistandard system implementations [8][9][10][11][12][13]. Often, multiband communication systems use channels or services that are closely spaced in frequency. Nowadays multiple X-band systems are deployed in urban areas. Point-to-point and point-tomultipoint telecommunication systems operate at 10.75-11.25 GHz, weather radars occupy 9.3-9.5 GHz band, and 11.45-11.70 GHz frequency band is destined to ensure

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Compact Lowpass and Dual-Band Bandpass Filter With Controllable Transmission Zero/Center Frequencies/Passband Bandwidth

Cited by 35 publications

References 20 publications

Miniaturized quad‐band filter with improved selectivity using split ring resonators and metallic strips

Miniaturized quad‐band filter with improved selectivity using split ring resonators and metallic strips

A Novel Band-Stop Filter with Band-Pass, High-Pass, and Low-Pass Negative Group Delay Characteristics

Independently Tunable Closely Spaced Triband Frequency Selective Surface Unit Cell Using the Third Resonant Mode of Split Ring Slots

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