Summary
International Symposium on Antennas and Propagation
2012
Session Number:POS1
Session:
Number:POS1-12
Ka-band Beam Switchable Fresnel Reflector
Akiko Kohmura,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
A new telecommunication service in Ka-band for the communication between satellites and other systems has been prepared. The objective of this study is to develop an antenna for the communication between satellites and an unmanned aerial system (UAS). The printed Fresnel reflector is suitable for this purpose. This study aims to achieve a beam switching function of the Fresnel reflector antenna by the introduction of a PIN diode on each patch. The antenna beam can be switched from one direction to the other with the diode bias voltage. The antenna consists of two different dimensions of passive array cell and one active array cell. Phase shift of the active cell varies pi rad by applying bias voltage into a diode. Advantage of the reflector antenna is small power consumption due to the limited number of active cells and their complement function mode. The concept achieves to save about 74 % to general active reflectarray that includes a diode for every cell. Effectiveness of the antenna concept was confirmed with a full wave simulation including equivalent circuits of the diode. The PIN diode switched the antenna beam direction 0 degree or 45 degree as intended.