Summary
International Symposium on Antennas and Propagation
2008
Session Number:1C05
Session:
Number:1C05-5
Proposal and Basic Study of an Electromagnetically Fed Planar-Type Yagi-Uda Sectored Antenna
Kyoichi IIGUSA, Hiroshi HARADA, Shuzo KATO,
pp.-
Publication Date:2008/10/27
Online ISSN:2188-5079
Summary:
Variable antenna directivity is seen to be one of the keys to achieve multifunction terminals. For consumer terminals, the properties, such as small size, light weight, low price, and low power consumption, are also indispensable. An electronically steerable parasitic array radiator (ESPAR) antenna has been well researched and developed as an antenna satisfying such properties [1]. However, a high-gain ESPAR antenna, for example, an antenna with gain greater than 10 dBi, has not yet been developed. In order to achieve higher gain, the number of elements must be increased. Therefore, we proposed an antenna arrangement involving some Yagi-Uda antennas with a common feed dipole [2]; the beam direction of this antenna can be switched by transforming the dipole elements, except one Yagi-Uda antenna, to electrically invisible state. The advantage of this antenna is that the desired performance can be realized by appropriately designing the unit Ygi-Uda antenna. However, this antenna has drawbacks with regard to mechanical stability, mass production, and compactness. Therefore, a Yagi-Uda sectored antenna with a planar structure is proposed, and its basic performance is investigated.