A compact sept‐band bandpass filter utilising a single multi‐mode resonator

Bi, X. J.; Wang, Lühua; Ma, Qiang; Hu, Baoquan; Xu, Qijun

doi:10.1049/iet-map.2018.6082

Cited by 10 publications

(7 citation statements)

References 26 publications

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“…To realize multiple passbands, multiple modes and transmission zeros (TZs) are used. A single MMR with sept-band characteristics was presented in [18]. In [19], a wideband octa-band BPF was poposed, it utlilized a lowpass filter (LPF) loaded shotted stubs.…”

Section: Introductionmentioning

confidence: 99%

A Highly Compact Sext-band Bandpass Filter with Simple Structure and Wide Bandwidth

2023

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A highly compact sext-band bandpass filter (BPF) is investigated in this paper, which adopts quad-section stepped impedance resonators (SIRs) along with a series of multiple open stubs. This quad-section SIRs are constructed by tri-section SIR loaded L-shaped resonator. To achieve compact size, the filter utilizes tri-section SIR and is embedded in the double L-shaped resonators. Aseries of multiple open stubs are introduced to improve fractional bandwidth and the return loss. A sext-band BPF centering at 1.12, 2,12, 2,78, 5,59, 6.59 and 8.97 GHz has been designed and fabricated. This highly compact sext-band with wide bandwidth and simple structure is constructed on Rogers 4350 with a dielectric constant of 3.66 and a height of 0.508mm. The overall size of the fabricated filter is 0.15λ g × 0.16λ g . Good agreements are observed between the simulated and measured results.

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Section: Introductionmentioning

confidence: 99%

A Highly Compact Sext-band Bandpass Filter with Simple Structure and Wide Bandwidth

2023

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“…Multi-band bandpass filters (BPFs) have been developing rapidly in line with the importance of such filters for multi-service wireless communication systems in recent years [ 1 , 2 , 3 ]. To provide for the needs of multiple-passband applications such as in DCS/WLAN/WiMAX/5G, quad-band BPFs have been commonly proposed and studied [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Design of Quad-Band Bandpass Filter Using Dual-Mode SLRs and Coupled-Line for DCS/WLAN/WiMAX and 5G Applications

et al. 2022

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A design of a microstrip quad-band BPF with flexibly controlled bandwidth is presented in this paper. Two dual-mode short-circuited SLRs with a common via-hole are proposed, which are utilized to obtain the first and second passband, while the third passband is generated by implementing the second-order half-wavelength coupled-line resonator. Another dual-mode open-circuited SLR can be operated at the fourth passband. The proposed quad-band BPF is centered at 1.80/2.45/3.50/4.90 GHz for DCS/WLAN/WiMAX and 5G applications. By appropriately choosing the lengths of the four sets of resonators, all passbands can be fully varied independently with minimal effect on other passbands. Moreover, the bandwidth of each passband can be flexibly controlled by tuning the coupling parameters. The dimension of the fabricated proposed filter is about 0.12 × 0.20 λg, indicating the compactness of the design, whereas the measurements are in good agreement with the simulated results. The measured S11 are at least 12 dB in the four passbands. The passbands S21 are approximately 0.65, 1.42, 0.78, and 1.20 dB, which exhibit low insertion loss at the passband frequency of the first, second, third, and fourth passband, respectively.

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“…Many researchers have proposed the Multiple Mode Resonators (MMR) to be the basis in the design of compact microwave bandpass filters (BPF) [12][13][14][15][16][17][18][19][20][21][22]. The MMR was used to generate a multi-band band-pass filtering response [12], and the slot line version of the MMR was utilized to design a differential mode BPF [13].…”

Section: Introductionmentioning

confidence: 99%

“…The cavity resonator was used as an MMR to control the transmission zeros of a BPF [17]. A combination of MMRs was devoted to design a sept-band BPF [18]. The MMR was attached to antennas to provide a stopband antenna radiation [19] or sharp bandpass radiation [20,21].…”

Section: Introductionmentioning

confidence: 99%

A Low-Cost Microwave Filter with Improved Passband and Stopband Characteristics Using Stub Loaded Multiple Mode Resonator for 5G Mid-Band Applications

et al. 2021

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This paper presents the design and implementation of a printed circuit microwave band-pass filter for 5G mid-band applications, using a Stub Loaded Multiple Mode Resonator (SL-MMR) technique. The objective of this article is to introduce a low-cost microstrip filter with improved passband and stopband characteristics, based on a mathematical analysis of stub loaded resonators. The filter cost is reduced by selecting the low-cost FR4 dielectric material as a substrate for the proposed filter. Based on the transmission line model of the filter, mathematical expressions are derived to predict the odd-mode and the even-mode resonant frequencies of the SL-MMR. The mathematical model also highlights the capability of controlling the position of the SL-MMR resonant frequencies, so that the 5G sub-band that extends along the range (3.7–4.2 GHz) can perfectly be covered with almost a flat passband. At the resonance frequency, a fractional bandwidth of 12.8% (500 MHz impedance bandwidth) has been obtained with a return loss of more than 18 dB and an insertion loss of less than 2.5 dB over the targeted bandwidth. Furthermore, a pair of parasitic elements is attached to the proposed filter to create an additional transmission zero in the lower stopband of the filter to enhance the suppression of the filter stopband. The measured and simulation results are well agreed, and both reveal the acceptable performance of the stopband and passband characteristics of the filter.

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A compact sept‐band bandpass filter utilising a single multi‐mode resonator

Cited by 10 publications

References 26 publications

A Highly Compact Sext-band Bandpass Filter with Simple Structure and Wide Bandwidth

A Highly Compact Sext-band Bandpass Filter with Simple Structure and Wide Bandwidth

Design of Quad-Band Bandpass Filter Using Dual-Mode SLRs and Coupled-Line for DCS/WLAN/WiMAX and 5G Applications

A Low-Cost Microwave Filter with Improved Passband and Stopband Characteristics Using Stub Loaded Multiple Mode Resonator for 5G Mid-Band Applications

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