Abstract
A broadband and high gain tapered slot antenna (TSA) by utilizing a broadband microstrip- (MS-) to-coplanar stripline (CPS) balun has been developed for millimeter-wave imaging systems and sensors. This antenna exhibits ultrawideband performance for frequency ranges from 70 to over 110 GHz with the high antenna gain, low sidelobe levels, and narrow beamwidth. The validity of this antenna as imaging arrays is also demonstrated by analyzing mutual couplings and 4-element linear array. This antenna can be applied to mm-wave phased array, imaging array for plasma diagnostics applications.
Highlights
The demand of wireless wideband communications is rapidly increasing due to the need to support more users and to provide more information with higher data rates
Wideband antennas are essential for providing wireless wideband communications
tapered slot antenna (TSA) is a planar end-fire antenna and is often used for microwave/millimeter-wave imaging, sensors, and phased arrays [2]
Summary
The demand of wireless wideband communications is rapidly increasing due to the need to support more users and to provide more information with higher data rates. Wideband communication devices require features of low-profile, linear polarization, and unidirectional patterns in a compact size [1]. TSA is a planar end-fire antenna and is often used for microwave/millimeter-wave imaging, sensors, and phased arrays [2]. It exhibits many advantages such as broad bandwidth, high gain, narrow beamwidth, and symmetrical radiation patterns. Conventional planar baluns such as MS-to-slotline, MS-to-CPS, coplanar waveguide- (CPW-) toslotline, and double Y impose limits on frequency bandwidth and radiation performances [6,7,8,9]. A broadband and high performance TSA for mm-wave imaging array application is presented. Its possibilities to the mm-wave imaging sensor arrays are investigated by analyzing the mutual coupling and the radiation patterns of 4-element arrays
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