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Based on half‐mode substrate‐integrated waveguide (HMSIW) cavity, a low‐profile antenna with frequency and radiation pattern reconfigurable characteristics is proposed in this article. A metal layer is printed on the bottom of the HMSIW cavity, which works as an extend ground plane. The resonance frequency, radiation gain and front‐to‐back ratio (FBR) of the HMSIW antenna are extremely sensitive to...
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