Abstract
A cylindrical substrate-integrated waveguide cavity-backed slot antenna is presented in this paper, which is devised for wideband operation. The fundamental and critical approach to generate a wide antenna bandwidth performance, in this case, is to merge three basic resonant modes (TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">010</sub> , TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">110</sub> , and TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">111</sub> modes) of the cylindrical cavity. In this paper, a fractional impedance bandwidth of 60% with S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> < −10 dB from 8 to 14.8 GHz has been achieved through this scheme. This antenna has a compact size of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.33\lambda $ </tex-math></inline-formula> ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\lambda $ </tex-math></inline-formula> denotes the space wavelength corresponding to the operating center frequency <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$f =11.25$ </tex-math></inline-formula> GHz in this demonstration), which is found suitable for many wireless applications. Its resulting simple structure is definitely of benefit to the fabrication and integration with other front-end parts. The proposed antenna exhibits a broadside radiation pattern, which is stable within the operating frequency band of interest. The simulated radiation efficiency is above 85%. The antenna has been fabricated and experimentally verified. Measured results show a good agreement with simulated counterparts.
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