Compact dual-band bandpass filter with controllable bandwidths using stub-loaded multiple-mode resonator

AbstractIn this paper, a miniaturized dual-band bandpass filter (DB-BPF) using embedded dual-mode resonator (DMR) with controllable bandwidths is proposed. Two passbands are generated by two sets of resonators operating at two different frequencies. One set of resonators is utilized not only as the resonant elements that yield the lower passband, but also as the feeding structures with source-load coupling to excite the other to produce the upper passband. Sufficient degrees of freedom are achieved to control the center frequencies and bandwidths of two passbands. Moreover, multiple transmission zeros (TZs) are created to improve the passband selectivity of the filter. The design of the filter has been demonstrated by the measurement. The filter features not only miniaturized circuit sizes, low insertion loss, independently controllable central frequencies, but also controllable bandwidths and TZs.

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Dual-mode resonator filter with improved feed-lines for dual-band applications

Journal of Electrical Engineering ◽

10.2478/jee-2020-0060 ◽

2020 ◽

Vol 71 (6) ◽

pp. 433-435

Author(s):

Shan Shan Gao ◽

Jia-Lin Li ◽

Zhe Lin Zhu ◽

Jia Li Xu ◽

Yong Xin Zhao

Keyword(s):

Simple Structure ◽

High Selectivity ◽

Bandpass Filter ◽

Dual Band ◽

Dual Mode ◽

Transmission Zeros ◽

Good Consistency ◽

Mode Resonator

AbstractAn improved feedline configuration for dual-mode resonator filter is investigated in this paper. Based on the introduced topology, a dual-mode dual-band bandpass filter with center frequencies of 1.8 and 2.4 GHz is optimally designed, fabricated and tested. The introduced dual-band bandpass filter has simple structure and enables high selectivity to be realized due to two pairs of transmission zeros located near to the lower and upper passband, respectively. Both measured and simulated performances are presented with good consistency.

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A NOVEL COMPACT SIZE UWB BANDPASS FILTER WITH SHARP REJECTION SKIRT AND WIDE UPPER-STOPBAND BASED ON MULTIPLE-MODE-RESONATOR

Progress In Electromagnetics Research C ◽

10.2528/pierc13073004 ◽

2013 ◽

Vol 43 ◽

pp. 175-185 ◽

Cited By ~ 1

Author(s):

Seyyed Jamal Borhani ◽

Mohammad Amin Honarvar

Keyword(s):

Bandpass Filter ◽

Multiple Mode ◽

Compact Size ◽

Sharp Rejection ◽

Mode Resonator

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Compact Ultra-Wide Band Bandpass Filter Design Employing Multiple-Mode Resonator and Defected Ground Structure

Procedia Computer Science ◽

10.1016/j.procs.2015.12.006 ◽

2015 ◽

Vol 73 ◽

pp. 376-383 ◽

Cited By ~ 6

Author(s):

Hassiba Louazene ◽

Mouloud Challal ◽

M’hamed Boulakroune

Keyword(s):

Bandpass Filter ◽

Filter Design ◽

Wide Band ◽

Ultra Wide Band ◽

Defected Ground Structure ◽

Ground Structure ◽

Multiple Mode ◽

Mode Resonator

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Design of 6-gon-Shaped Notch Filter for Cognitive Radio Applications

Journal of Circuits System and Computers ◽

10.1142/s0218126618500858 ◽

2018 ◽

Vol 27 (06) ◽

pp. 1850085

Author(s):

A. Uma Maheswari ◽

K. Latha

Keyword(s):

Cognitive Radio ◽

Return Loss ◽

Group Delay ◽

Bandpass Filter ◽

Narrow Band ◽

Notch Filter ◽

Structural Features ◽

Fractional Bandwidth ◽

Multiple Mode ◽

Mode Resonator

This paper presents a 6-gon-shaped bandpass and notch filters for Cognitive Radio (CR) applications. The bandpass filter consists of a 6-gon-shaped multiple mode resonator with interdigital coupling at both ends. The notch filter is derived from bandpass filter by embedding four identical Embedded Open Stubs (EOS) nearby the multiple mode resonators that introduce narrow band suppression in the desired passband. Such bandpass filter with notching band is required in practical CR systems in order to effectively sense the spectrum and avoid the interference between the systems working in same environment with the same frequency. The filter is simulated using an electromagnetic solver, IE3D. The group delay obtained for bandpass filter is below 0.2[Formula: see text]ns. With the above structural features, the overall dimension of the filter is [Formula: see text][Formula: see text]mm2 and the fractional bandwidth (FBW) of the proposed bandpass filter is more than 100% with optimal performances in terms of insertion loss, return loss, group delay and phase.

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