Summary
International Symposium on Antennas and Propagation
2011
Session Number:ThD3
Session:
Number:ThD3-6
Frequency Tunable Antenna by Non-resonant Parasitic Element
Hiroyuki ARAI, Hiroki OHTA,
pp.-
Publication Date:2011/10/25
Online ISSN:2188-5079
Summary:
Recently, trimming technique has become one of the most useful technologies with tunable antennas. Tunable antenna can change the resonant bandwidth of the antenna by the varicap diode and switch [1]-[2]. A problem of tuning is the change of antenna pattern by adjustment devices. This paper proposes a new trimming method for frequency tunable antennas without changing the antenna pattern. The input characteristic of the antenna varies by arranging a nonresonant electric obstacle in its neighborhood, which does not cause the change in radiation pattern [3]. First, we analyze several kinds of antenna with parasitic elements to investigate the control of input characteristics. We optimize the geometry of adjacent parasitic elements to control the antenna input characteristics and demonstrate its effect by experiments. In addition, we consider the trimming method in order to achieve on/off switching; to obtain a new tunable antenna.