New approach to design a compact triband bandpass filter using a multilayer structure

Majidifar, Sohrab; Hayati, Mohsen

doi:10.3906/elk-1609-129

Cited by 11 publications

(9 citation statements)

References 18 publications

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“…Also, the filter is packed in a gold-plated box which increases the fabrication cost. Another triple-band filter using a multilayer structure is presented in [21]. The presented filter has poor fractional bandwidth, high insertion losses, larger circuit size and a multilayer structure leaves the fabrication process more complex.…”

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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“…Multilayer band-pass structure solves this problem [14,15]. For the last decade, the subject concerned significant interest and multilayer structure methods have been introduced in order to reduce the size and increase the bandwidths of the microstrip filters [16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

A compact size microstrip five poles hairpin band-pass filter using three-layers structure for Ku-band satellites application

et al. 2020

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This paper presents a reduced size microstrip five poles hairpin band-pass filter using three-layers structure for Ku-band satellites application. The three-layers structure shows a substantially reduced filter size and enlarged bandwidth. The filter has been designed based on five-pole resonators at 12.475 GHz and bandwidth of 550 MHz. This filter is designed on Rogers RO3003 substrate having relative permittivity (εr) of 3. The proposed band-pass filter has been designed with the help of Computer Simulation Technology (CST) software. Comparison analyses between the simulated insertion loss and reflection coefficient of RO3003 and FR4 substrates have been carried out in order to show the efficiency of the proposed filter design. Based on the obtained results, the proposed filter design achieves significant filter size reduction compared to other band-pass filters.

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“…Generally speaking, [11,12] have smaller size than the filters combining sets of resonators, but the BW of the proposed filter could not be controlled. And some filters, such as filters in [9][10][11][13][14][15], have difficulty in the fabrication due to some via holes or multi-layer structure. Hence, a multi-band BPF which has smaller size, controllable BW, and easier fabrication is worth studying.…”

Section: Introductionmentioning

confidence: 99%

Design of Dual-/Tri-Band BPF With Controllable Bandwidth Based on a Quintuple-Mode Resonator

Zhang¹,

Wang²,

Zhao³

et al. 2019

PIER Letters

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In this article, a new class of dual-/tri-band bandpass filters (BPFs) using a quintuplemode resonator (QMR) is proposed. The classic odd-/even-mode analysis method is used to analyze the two filters due to their symmetrical structure. Owing to characteristics of the QMR, the dual-/tri-band BPFs based on the same topology are designed. The bandwidths (BWs) of the passbands are controllable. A dual-band BPF with center frequencies of 2.1 GHz/3.43 GHz and a tri-band BPF with center frequencies of 2.35 GHz/3.44 GHz/5.2 GHz are designed, fabricated, and measured. The fabricated filters are compact in size, and measured results are in good agreement with the simulated ones.

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New approach to design a compact triband bandpass filter using a multilayer structure

Cited by 11 publications

References 18 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 compact size microstrip five poles hairpin band-pass filter using three-layers structure for Ku-band satellites application

Design of Dual-/Tri-Band BPF With Controllable Bandwidth Based on a Quintuple-Mode Resonator

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