Design of tri‐band bandpass filter using symmetrical open stub loaded step impedance resonator

AbdulRehman, M.; Khalid, Sohail

doi:10.1049/el.2018.5240

Cited by 19 publications

(13 citation statements)

References 7 publications

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“…The presented filter has poor fractional bandwidth, high insertion losses, larger circuit size and a multilayer structure leaves the fabrication process more complex. To improve the fractional bandwidth and insertion loss for the passbands, the authors of [22]- [25], designed a triple-band BPFs based on uniform SIRs and open stub loaded SIRs for different frequency bands. But structural complexity and larger circuit dimensions were major drawbacks associated with these designs.…”

Section: Introductionmentioning

confidence: 99%

Design of a Compact Microstrip Triple Independently Controlled Pass Bands Filter for GSM, GPS and WiFi Applications

et al. 2020

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An ultra-compact triple-band bandpass filter based on dual-mode quarter-wave resonator for GSM, GPS, and WiFi applications is presented in this study. The filter consists of three quarter-wave resonators assisting in controlling each passband independently. The first operating frequency band is obtained by the direct-feed resonator which acts as a source to load coupling for the inner two resonators which are operating at higher frequency bands. The outermost resonator is coupled to the inner loaded resonators, thus a pair of transmission zeros between each passband can be excited and hence high-frequency selectivity can be obtained. To miniaturize the overall size of the filter, all resonators are folded and are jointly connected through a common metallic via with the ground. The design has a symmetric structure therefore, even-odd mode analysis method is applied to obtain the three controllable operating frequency bands. The first operating band is centered at 850 MHz which caters for GSM applications, while the second and third frequency bands centered at 1.57 GHz and 2.4 GHz fall in the GPS and WiFi wireless applications. The filter with an ultra-compact size of 0.10 λ g × 0.09 λ g (0.009λ 2 g) despite feed lines (λ g is the waveguide length centered at 850 MHz) is designed, fabricated and measured for the purpose of validation. Both the simulated and measured results are in good agreement and endorse the design concept. INDEX TERMS Tri-band filter, quarter-wavelength resonator, microstrip BPF filter, transmission zeros, wireless applications.

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Section: Introductionmentioning

confidence: 99%

Design of a Compact Microstrip Triple Independently Controlled Pass Bands Filter for GSM, GPS and WiFi Applications

et al. 2020

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“…In modern wireless communications, multiband bandpass filters (BPFs) are essential components in a variety of wireless technologies with simultaneous multistandard applications [1], [2], such as global positioning system (GPS), wireless local area network (WLAN/WiFi), global system for mobile communications (GSM/2G), wideband code division multiplexing access (WCDMA/3G), long term evolution (LTE/4G), [2], [3] and 5G communications [4]. As an important subsystem of multiband wireless transceivers, multiband BPFs with excellent performance and the capability to support wireless technology by concurrently reducing interfer-…”

Section: Introductionmentioning

confidence: 99%

A Highly Independent Multiband Bandpass Filter Using a Multi-Coupled Line Stub-SIR With Folding Structure

et al. 2020

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The main problem in designing a multiband bandpass filter (BPF) is making each passband response highly independent, where each bandwidth of multiband BPF can be controlled and adjusted separately. To overcome this problem, this paper proposes a highly independent multiband BPF based on a multicoupled line stub-SIR with a folding structure. The proposed multiband BPF is constructed as a multicoupled line to generate a highly independent inter-passband. Moreover, the multiband performance is produced separately and independently by using three sets of resonators: resonator A1/A2 (R A1 and R A2), resonator B1/B2 (R B1 and R B2), and resonator C1/C2 (R C1 and R C2). The three passband frequencies can be independently arranged and designed. To miniaturize the multiband BPF, a folding structure is also proposed. As a result, the multiband BPF has a compact size that is reduced by over 61.29 % compared to previous structures. The even-odd excitation model and the equivalent circuit model are used to analyze the multiband BPF structure. This BPF is designed for GPS applications at 1.57 GHz, WCDMA (3G) at 1.8 GHz, WLAN (WiFi) at 2.4 GHz, LTE (4G) at 2.6 GHz, and 5G communication at 3.5 GHz. To evaluate and validate the proposed structure of the multiband BPF, the circuits are fabricated and tested. The simulated and measured results of the multiband BPF show good agreement. In conclusion, the proposed multiband BPF structure has a highly independent inter passband response and a compact size. INDEX TERMS Compact, folding structure, highly independent, multiband BPF.

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“…In the modern wireless multi-band communication system, planar filters with miniaturized size, sharp passband skirt, controllable center frequency, and bandwidth are widely used due to the increasing demand for performance and cost. Many design approaches for tri-band Bandpass filter (BPF) filters have been reported in the past decades [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Traditional methods use cascaded stepped-impedance resonators (SIRs) to realize controllable center frequencies [1].…”

Section: Introductionmentioning

confidence: 99%

A miniaturized tri-band bandpass microstrip filter using multiple resonators with sharp skirts

Wang

Zhao

et al. 2020

Int. J. Microw. Wireless Technol.

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In this paper, a miniaturized tri-band bandpass microstrip filter using stub loaded rectangular ring resonator (SLRRR)，shorted stub loaded stepped impedance resonators (SSLSIR), and stepped impedance resonators (SIR) with sharp skirts is presented. Two SSLSIRs are embedded paralleled inside SLRRR to generate a quasi-elliptic response at second and third passband. The odd-even fundamental resonant mode and first high-order resonant mode of the SIRs are exploited to generate tri-band response. Three bandwidths can be controlled independently due to different signal paths. Extra transmission zeros are introduced by the configuration of 0° feed structure. Sharp skirts are achieved at the upper edge of each passband by λg/4 lines which are loaded at the I/O ports. An example of the proposed tri-band filter operating at 2.76 GHz/5.7 GHz/7.63 GHz for TDD-LTE/WLAN/VSAT applications is implemented and fabricated. The simulation and measurement show a good agreement.

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Design of tri‐band bandpass filter using symmetrical open stub loaded step impedance resonator

Cited by 19 publications

References 7 publications

Design of a Compact Microstrip Triple Independently Controlled Pass Bands Filter for GSM, GPS and WiFi Applications

Design of a Compact Microstrip Triple Independently Controlled Pass Bands Filter for GSM, GPS and WiFi Applications

A Highly Independent Multiband Bandpass Filter Using a Multi-Coupled Line Stub-SIR With Folding Structure

A miniaturized tri-band bandpass microstrip filter using multiple resonators with sharp skirts

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