A Miniaturized Dual-Band Bandpass Filter Using Embedded Resonators

Based on meander split loop resonator (MSLR), dual band filter with wide bandwidth, low insertion loss and compactness is investigated and fabricated. Embedded spiral coupled line (ESCL) is added not only to enhance coupling between two split stubs, but to adjust transmission zeros (TZs) and form dual band response. Through transformation among ABCD‐matrix, Y‐matrix, and S‐matrix, TZs of proposed filter can be analyzed. Utilizing direct connection of feed line and MSLR, low insertion loss is achieved.

Section: Introductionmentioning

confidence: 99%

“…Utilizing stepped impedance resonators (SIRs) and radial cells, 2nd‐order open loop dual band bandpass filter is designed . Despite large frequency ratio, these configurations share the same disadvantage with narrow bandwidth . In ref.…”

Section: Introductionmentioning

confidence: 99%

Dual band bandpass filter using meander split loop resonator

Zhang

Xie

et al. 2017

“…In Refs. and , one resonator is embedded into another resonator to obtain miniaturized dual‐band and tri‐band BPFs, respectively. Based on the resonance characteristics of the stepped impedance resonator (SIR), a dual‐band BPF is presented in Ref.…”

Section: Introductionmentioning

confidence: 99%

Compact tri‐band bandpass filter with controllable frequencies

Gao

Xiang

et al. 2016

In this paper, we present a compact tri‐band bandpass filter (BPF). The resonator, which consists of a main transmission line, a center‐loaded open stub and a side‐loaded open stub, is utilized to obtain the three resonance frequencies. After selecting the impedance of each stub at this resonator, the passband frequencies can be controlled individually. Four transmission zeros are generated to enhance the selectivity. For demonstration, a compact tri‐band BPF is implemented. Good agreement between the measured and simulated results is presented to verify the theoretical predication. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:573–577, 2016

“…Recently, various structures and techniques have being introduced to design BPFs with single or multiple passbands . Because of their compact size, simple design process, and good design flexibility, stub‐loaded dual‐mode resonators are widely used to realize single‐ and dual‐band BPFs .…”

Section: Introductionmentioning

confidence: 99%

Dual‐mode stub‐loaded resonator and its applications to single‐ and dual‐band bandpass filters

Zhang

Huang

et al. 2016

In this letter, a novel dual‐mode stub‐loaded resonator is proposed with independently controllable coupling coefficients under different resonant modes. The main structure is constructed by loading a short‐circuited stub in the center of an open‐loop half‐wavelength resonator. Frequencies of first and second resonant modes can be adjusted by changing the dimensions of the loaded stub and open‐loop resonator, respectively. Additionally, a pair of edge‐coupled ear‐structures is added to adjust the difference between the coupling coefficients of different resonant modes. Finally, a dual‐band bandpass filter (BPF) with independently controllable bandwidths as well as a single‐band BPF with high selectivity are designed and fabricated to provide experimental validations on the predicted performances of the proposed filters. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:623–626, 2016