Abstract
A rectangular waveguide band-stop filter using electromagnetic crystals (EMXT) surface as the top and bottom walls is presented in this letter. The EMXT surface has a band gap that can prevent electromagnetic wave from propagating along the waveguide. Dispersion properties of the waveguide filter are analyzed using an approximated lumped-element circuit model. A W-band prototype based on the proposed waveguide filter is designed and characterized. The experimental results show a rejection band centered at 97 GHz and a rejection level of 16 dB.
Highlights
Electromagnetic crystals (EMXT), known as electromagnetic band-gap (EBG) structures, are periodic structure that exhibits band-gap characteristics
A rectangular waveguide band-stop filter using electromagnetic crystals (EMXT) surface as the top and bottom walls is presented in this letter
A W-band prototype based on the proposed waveguide filter is designed and characterized
Summary
Electromagnetic crystals (EMXT), known as electromagnetic band-gap (EBG) structures, are periodic structure that exhibits band-gap characteristics. The grounded substrate provides inductive response that in conjunction with the capacitive patches/strips forms a resonant structure. Due to their unique properties, the high-impedance surfaces have been used in many applications such as antenna ground planes [1] [2], quasi-TEM waveguides [3] [4], band-pass filters [5] [6], and band-stop filters [7]. Analysis of the unit cell response of the EMXT surface to obtain the band-gap information is commonly practiced. To further understand the overall response, a lumpedelement circuit model is introduced for the analysis of this waveguide band-stop filter. A prototype W-band filter is designed and characterized with a stop band centered at 97 GHz and a rejection level of 16 dB
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