An independently reconfigurable dual-mode dual-band substrate integrated waveguide filter.

Yongle Wu,Weimin Wang,Lidan Yao,Yuqing Chen,Yuanan Liu,Lakshminarayana Polavarapu

doi:10.1371/journal.pone.0179816

Yongle Wu, Weimin Wang + Show 4 more

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https://doi.org/10.1371/journal.pone.0179816

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Abstract

In this paper, a novel perturbation approach for implementing the independently reconfigurable dual-mode dual-band substrate integrated waveguide (SIW) filter is proposed. Dual-frequency manipulation is achieved by adding perturbation via-holes (the first variable) and changing the lengths of the interference slot (the second variable) in each cavity. The independent control of the upper passband only depends on the second variable while the lower passband is independently tuned by combining the two variables. Using such a design method, a two-cavity dual-band SIW filter is designed and experimentally assessed with four via-holes and an interference slot in each cavity. The dual-band filter not only has a frequency ratio (fR) ranging from 1.14 to 1.58 but also can be considered as a single passband one with a tunable range of 40.5% from 1.26 GHz to 2.12 GHz. The scattering parameters |S11| and |S21| are in the range of -10.72 dB to -37.17 dB and -3.67 dB to -7.22 dB in the operating dual bands, respectively. All the simulated and measured results show an acceptable agreement with the predicted data.

Highlights

Multiband bandpass filters are of interest in many wireless applications for interference reduction in a two-way radio system, different frequency bands utilization in the congested spectrum of electromagnetic waves, and compatibility of wireless devices with different standards
We propose a novel simple approach, adding perturbation via-holes and changing the lengths of the interference slots, for designing a single-layer dual-mode dualband independently reconfigurable substrate integrated waveguide (SIW) filter
To achieve dual-mode dualband SIW filter with the lower and the upper frequency generated by the TE101 and the TE102 modes, respectively, the initial sizes in Fig 1 can be calculated by the following equation [15]: fm0n 1⁄4 2pc0ffiεffiffirffi v u u tffiffiffiLffiffiffimcffiffiÀffi2ffiffiffiþffi0ffiffi:d9ffiwffi5nffi2ffis2ffiwffiffiffiffi2ffiffi ð1Þ

Summary

Introduction

Multiband bandpass filters are of interest in many wireless applications for interference reduction in a two-way radio system, different frequency bands utilization in the congested spectrum of electromagnetic waves, and compatibility of wireless devices with different standards. Integrating a bank of fixed-frequency filters in a wireless system will definitely add to the complexity. This factor inspires developing filters that can simultaneously work at multiple bands and dynamically tune the operating bands if needed. Some traditional materials are used to implement filters through different theoretical techniques. There are new materials which can be operated at microwave frequency band such as graphene [1,2] and topological insulator: Bi2Te3 [3].

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