scholarly journals Design of Wideband Bandpass Filter Based on Corrugated Disk Resonator with Multiple Resonant Modes

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2614
Author(s):  
Qian Yang ◽  
Shuangyang Liu ◽  
Hongyu Shi ◽  
Kai-Da Xu ◽  
Xinyue Dai ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Bandpass Filter ◽  
Design Method ◽  
Center Frequency ◽  
Localized Surface Plasmons ◽  
Metallic Structure ◽  
Disk Resonator ◽  
Resonant Frequencies ◽  
Resonant Modes ◽  
Via Holes

A corrugated disk resonator with eight grooves is proposed for wideband bandpass filter (BPF) design. Due to the spoof localized surface plasmons resonances of the corrugated metallic structure, the dipole, quadrupole, hexapole modes, and a fundamental mode excited by the introduced short-circuited via holes are employed to realize four transmission poles (TPs) in the passband. The theoretical analysis is described by the electric field and current distributions on the resonator. The resonant frequencies can be tuned easily by the parameters of the structure, which can be used to adjust the center frequency and bandwidth of the BPF freely. Furthermore, two resonators are cascaded to obtain eight TPs to improve the selectivity performance. Finally, three fabricated filters demonstrate the design method.

Design of a miniaturized tri-band bandstop filter using spur microstrip lines and via-hole grounding

Circuit World ◽  
2020 ◽  
Vol 46 (4) ◽  
pp. 347-354
Author(s):  
Revathi Ganesan ◽  
Radha Sankararajan
Keyword(s):  
Design Methodology ◽  
Vital Role ◽  
Center Frequency ◽  
Resonant Frequencies ◽  
Content Type ◽  
Original Length ◽  
Filter Size ◽  
Via Holes ◽  
Via Hole ◽  
Bandstop Filter

Purpose The purpose of this paper is to propose a miniaturized tri-band bandstop filter that finds application in a modern dense communication system where size and multi-band plays a vital role. Design/methodology/approach In this paper, the authors propose a miniaturized tri-band microstrip bandstop filter which combines the conventional bandstop filter and spur microstrip line structures such that this design achieves tri-band operation at 1.8 GHz and 3 GHz. The overall length of the microstrip filter is found to reduce from 126 to 45 mm because of introduction of spur lines and via-hole grounding. The addition of spur lines replaces two resonators, introduces two additional resonant frequencies and enhances the −6 dB bandwidth of the center frequency by 14 %.The addition of via-holes in each resonator reduces its length into half of its original length, thereby reducing filter size. Findings Resonance occurs at three different frequencies 1.8, 2.4 and 3 GHz. The filter size reduces from 126 to 45 mm, and the −6 dB rejection bandwidth of center frequency improves by 14 %. Originality/value The overall filter size is reduced by 65% and it resonates at three different frequencies 1.8, 2.4 and 3 GHz with an improved bandwidth of 10 % around the center frequency.

Design of the Parallel Coupled Microstrip Bandpass Filter

2014 ◽  
Vol 1046 ◽  
pp. 297-300
Author(s):  
Shuang Zhao ◽  
Dian Ren Chen
Keyword(s):  
Frequency Response ◽  
Bandpass Filter ◽  
Design Method ◽  
Center Frequency ◽  
Microstrip Filter ◽  
Relative Bandwidth

A design method of microstrip filter with good isolation is presented. In the paper, the design method of microstrip bandpass filter is introduced, and one example filter with 3.075GHz center frequency, 9% relative bandwidth is given. With the aid of microwave HFSS software, the microstrip filter is simulated. The result of simulation shows the microstrip filter has an excellent frequency response.

scholarly journals Multiple-Mode Wideband Bandpass Filter Using Split Ring Resonators in a Rectangular Waveguide Cavity

Electronics ◽  
2018 ◽  
Vol 7 (12) ◽  
pp. 356 ◽  
Author(s):  
Musab Hameed ◽  
Gaobiao Xiao ◽  
Lina Qiu ◽  
Can Xiong ◽  
Tayyab Hameed
Keyword(s):  
Rectangular Waveguide ◽  
Bandpass Filter ◽  
Split Ring Resonator ◽  
Ring Resonators ◽  
Center Frequency ◽  
Split Ring ◽  
Cavity Resonators ◽  
Resonant Modes ◽  
Coaxial Probes ◽  
Multi Mode

This paper presents a simple split ring resonator excitation to realize a multi-mode wideband bandpass filter in a rectangular waveguide cavity. The proposed resonator employs two rectangular split rings attached with two coaxial probes extended into the cavity to excite two resonant modes, unlike the conventional cavity resonators which employ conductive cylinders in the cavities to achieve the same results. A hybrid magnetic (HM) mode and a hybrid electric (HE) mode are the two hybrid modes excited to realize the wideband bandpass filter. The filter operates at 2.5 GHz center frequency with 53% fractional bandwidth. Finally, the prototypes of a second and a fourth order filter are fabricated for results validation. Measured results are in good agreement with the simulated ones.

A wide stopband multilayer substrate integrated waveguide bandpass filter with suppression of higher-order mode coupling

2021 ◽  
pp. 1-8
Author(s):  
Cong Tang ◽  
Fei Cheng ◽  
Chao Gu
Keyword(s):  
Bandpass Filter ◽  
Single Layer ◽  
Magnetic Coupling ◽  
Higher Order ◽  
Center Frequency ◽  
Substrate Integrated Waveguide ◽  
Cavity Resonators ◽  
Resonant Modes ◽  
Compact Size ◽  
Multilayer Substrate

Abstract This paper presents a compact multilayer substrate integrated waveguide (SIW) bandpass filter with wide stopband. The square SIW cavity resonators in multilayer substrates are horizontally and vertically coupled with magnetic coupling. By properly designing the coupling structure, the couplings between the higher-order resonant modes can be suppressed. Compared with the conventional single-layer SIW filters, the proposed multilayer SIW filter also exhibits a compact size. To verify the design concept, a double-layered SIW filter is fabricated and measured. The measured results agree well with the simulations. The measured results show that the upper stopband of the filter is extended to 2.73 times of the center frequency 8.02 GHz.

scholarly journals Design of a Suspended Stripline Narrow Bandpass Filter with Ultrawideband Harmonic Suppression

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Ju Seong Park ◽  
Wahab Mohyuddin ◽  
Hyun Chul Choi ◽  
Kang Wook Kim
Keyword(s):  
Insertion Loss ◽  
High Performance ◽  
Bandpass Filter ◽  
Design Method ◽  
Characteristic Impedance ◽  
Wireless Systems ◽  
Bandpass Filters ◽  
Center Frequency ◽  
Harmonic Suppression ◽  
Low Loss

A design method of narrow bandpass filters (NBPFs) of 4–6% bandwidth with ultrawideband suppression of harmonic passbands, utilizing two cascaded step impedance resonators (SIRs) in a suspended stripline, is proposed in this paper. The proposed design utilized the characteristics of a suspended stripline, which provides a much higher characteristic impedance ratio as compared with that of the microstripline, enabling ultrawideband harmonic suppression. As an example of the NBPF, a filter with a passband center frequency f0 of 0.75 GHz and bandwidth of 5% was implemented and proved to suppress the harmonic passbands up to 13.5 f0. Since the proposed filter was implemented on the suspended stripline, the passband insertion loss was only −0.9 dB, which is low as compared with other previous designs. The proposed filter is a compact high-performance low-loss NBPF, which can be applicable to various wireless systems.

Compact dual-mode microstrip bandpass filter based on slotted square patch resonator

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Karthie S. ◽  
Zuvairiya Parveen J. ◽  
Yogeshwari D. ◽  
Venkadeshwari E.
Keyword(s):  
Bandpass Filter ◽  
Filter Design ◽  
Center Frequency ◽  
Dual Mode ◽  
Content Type ◽  
Transmission Zeros ◽  
Compact Size ◽  
Mode Response ◽  
Better Than ◽  
Good Agreement

Purpose The purpose of this paper is to present the design of a compact microstrip bandpass filter (BPF) in dual-mode configuration loaded with cross-loop and square ring slots on a square patch resonator for C-band applications. Design/methodology/approach In the proposed design, the dual-mode response for the filter is realized with two transmission zeros (TZs) by the insertion of a perturbation element at the diagonal corner of the square patch resonator with orthogonal feed lines. Such TZs at the edges of the passband result in better selectivity for the proposed BPF. Moreover, the cross-loop and square ring slots are etched on a square patch resonator to obtain a miniaturized BPF. Findings The proposed dual-mode microstrip filter fabricated in RT/duroid 6010 substrate using PCB technology has a measured minimum insertion loss of 1.8 dB and return loss better than 24.5 dB with a fractional bandwidth (FBW) of 6.9%. A compact size of 7.35 × 7.35 mm2 is achieved for the slotted patch resonator-based dual-mode BPF at the center frequency of 4.76 GHz. As compared with the conventional square patch resonator, a size reduction of 61% is achieved with the proposed slotted design. The feasibility of the filter design is confirmed by the good agreement between the measured and simulated responses. The performance of the proposed filter structure is compared with other dual-mode filter works. Originality/value In the proposed work, a compact dual-mode BPF is reported with slotted structures. The conventional square patch resonator is deployed with cross-loop and square ring slots to design a dual-mode filter with a square perturbation element at its diagonal corner. The proposed filter exhibits compact size and favorable performance compared to other dual-mode filter works reported in literature. The aforementioned design of the dual-mode BPF at 4.76 GHz is suitable for applications in the lower part of the C-band.

Half-mode substrate integrated plasmonic waveguide for filter and diplexer designs

2021 ◽  
Author(s):  
Yue Cui ◽  
Kai-Da Xu ◽  
Ying-Jiang Guo ◽  
Qiang Chen
Keyword(s):  
Communication Systems ◽  
Surface Plasmon Polariton ◽  
Simple Structure ◽  
Bandpass Filter ◽  
Cutoff Frequency ◽  
Plasmonic Waveguide ◽  
Wireless Communication Systems ◽  
Integrated Devices ◽  
Measurement Results ◽  
Via Holes

Abstract A half-mode substrate integrated waveguide (HMSIW) combined with spoof surface plasmon polariton (SSPP) structure is proposed to realize bandpass filter (BPF) characteristic and miniaturization, which is termed as the half-mode substrate integrated plasmonic waveguide (HMSIPW). Compared with the conventional HMSIW structure having identical cutoff frequency, this new design of HMSIPW not only supports SSPP modes, but also realizes a transversal size reduction of 19.4% and longitudinal reduction of more than 60%. Then, a diplexer based on two back-to-back placed HMSIPW BPFs is designed, and it has only one row of metallized via holes to further reduce the transversal size. The experimental prototypes of the filters and diplexer have been manufactured, and the measurement results agree well with simulation ones. Due to the size miniaturization and simple structure, the proposed designs will have many potentials in the integrated devices and circuits for wireless communication systems.

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