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Single arm rectangular spiral antenna with four open circuit switches over a high-impedance surface (HIS) is proposed for pattern reconfigurable applications. The HIS plane without vias is utilized to achieve a low-profile antenna design with a net thickness of 5.08 mm. This is equivalent to ~ lambdao/17 for the intended operating frequency of 3.3 GHz. By using the possible sixteen switching combinations...
This paper covers five different types of single element beam scanning antennas under electronic switch control. Firstly, a rectangular spiral antenna with shorting and open switches is presented. Following that, its polarization and other antenna parameter limitations are addressed. Then new structures, namely: star strip, star patch and square loop antennas, introduced to overcome the polarization...
This paper presents the extension of the high impedance surface (HIS) idea and its application to the switchable beam single arm spiral antennas proposed in (A. Mehta et al., 2006, 2004) in order to reduce its substrate thickness. A low profile single arm spiral antenna for tilted beam radiation using a small ground plane (0.97 lambdag) and a practical coax feeding from bottom is presented. As pointed...
Recently, a single-arm rectangular spiral antenna with a switching network is proposed by the authors for switched beam applications. A spiral configuration using four shorting switches for both single- and multi-point switching is investigated in A. Mehta et a. (2005) where characteristics of sixteen possible switching cases are outlined. In this paper for the first time, both MEMS and hard wired...
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