Abstract
This paper is divided into two sections, in the first section, a new SIW and a half-mode SIW band-pass filters based on complementary hexagonal metamaterial cells (C-HMCs) are proposed. Firstly, the SIW is analyzed in case of using two C-HMC cells and in the case of using four of these cells. Secondly, the HMSIW tunable BPF is studied and optimized. The size of the half mode is reduced by almost 50%. This filter design has a very high insertion loss about -0.4 dB, and significant transmission bandwidth extending from 5.9 GHz to 6.5 GHz. In the second section of this paper, an electronically reconfigurable SIW band-pass filter is proposed. By implementing two PIN diodes in the gaps of the two C-HMC, the results of turning the diodes ON or OFF individually is a switching in the frequency center, between 5.8 GHz and 6.8 GHz. Also, a dual band with two frequency centers at (5.6 GHz and 7.4 GHz) is achieved by turning both of the diodes ON. In addition, the metamaterial properties of all the proposed filters are investigated and presented in this work.
Highlights
DUE to the development of modern radio frequency and microwave systems these days, there are new devices that are much more miniaturized, multifunctional, and can work with multiple bands
substrate integrated waveguide (SIW) bandpass filters (BPF) LOADED WITH 4 complementary hexagonal metamaterial cells (C-HMCs) In this part, we present a design of a SIW band-pass filter measured in the C-band
The electrical equivalent circuit presented in fig.13 is for the reconfigurable SIW bandpass filter, which is loaded with two different C-HMC sizes, and two PIN diodes
Summary
DUE to the development of modern radio frequency and microwave systems these days, there are new devices that are much more miniaturized, multifunctional, and can work with multiple bands. Microstrip has been the first based choice structure for the famous tunable bandpass filters (BPF). In order to further improve the compatibility of filters in general with the rapidly develop modern wireless communication systems that are going more and more miniature, a half mode substrate integrated waveguide (HMSIW) is proposed. As a structure that has the same characteristics of a SIW but with half of its size This means more miniaturization, resulting in better integration with other circuits. This article proposes new bandpass filter structures These structures are even more miniaturized compared to previous researches because of the loaded complementary-Hexagonal Metamaterial cells on the SIW or HMSIW filter. A reconfigurable tunable SIW filter based on complementary hexagonal shape metamaterial resonators and PIN diodes is proposed. The center frequency of this filter can be changed electronically by turning the diodes ON and OFF, which can change its state between a single or a dual-band filter
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