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Electromagnetic crystal (EMXT) waveguide band-stop filter

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5 Author(s)
Hao Xin ; Rockwell Sci. Co., Thousand Oaks, CA, USA ; A. Higgins ; J. Hacker ; Moonil Kim
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An electromagnetic crystal (EMXT) with a bandgap around 35 GHz is used as the top and/or bottom walls of a rectangular waveguide. Because of its bandgap, such an EMXT waveguide is a very effective band-stop filter with the rejection band centered at 35 GHz. More than 70 dB of isolation for the rejection band and less than 2 dB of insertion loss for the pass band are measured. Finite element simulation of the EMXT band-stop filter agrees very well with measurements. Using tunable EMXT walls, a band-stop filter with adjustable center frequency and bandwidth can also be realized.

Published in:

IEEE Microwave and Wireless Components Letters  (Volume:13 ,  Issue: 3 )