Summary
International Symposium on Antennas and Propagation
2010
Session Number:4FC1
Session:
Number:4FC1-5
Experimental Study of a Partially Driven Array Antenna with a Reflector
Tadashi Takano, Takehiro Imura, Midori Okumura,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
Phased array antennas are quite attractive due to the agility of beam scan. Up to now, many attempts were studied to use this antenna in advanced radio communications [1], but almost all failed. The reasons may be disadvantages in cost, weight and size, and power consumption [2]. The phased array antenna is also available to construct quite a large aperture in addition to beam agility for microwave power transmission systems [3]. To solve the above-mentioned disadvantages, we proposed the concept of a partially drivenarray antenna (PD-AA) [4]. Some elements in a fully driven array antenna are replaced with undriven elements or parasitic elements by means of the active utilization of electromagnetic coupling between array elements. The PD-AA scheme was verified using dipoles in space without a reflector which were coupled via a direct wave [5]. However, as an actual antenna should have a reflector to shield radiation in the back-side, a new type of PD technique is required. This paper proposes and clarifies the coupling via a reflected wave in addition to a direct wave in order to realize a practical PD-AA with a reflector which may be called a PD-AAR.