Title :
A bent-ends spiral antenna above a fan-shaped electromagnetic band-gap structure
Author :
Tanabe, Masahiro ; Oyama, Mikiko ; Masuda, Yasuharu
Author_Institution :
Defense & Electron. Syst. Div., Toshiba Corp., Kawasaki, Japan
Abstract :
This paper describes radiation characteristics of a bent-ends two-arm Archimedean spiral antenna above a fan-shaped electromagnetic band-gap (EBG) structure. The EBG structure consists of fan-shaped EBG patch cells. The fan-shaped EBG patches are arranged homogeneously in the circumferential direction but are set non-homogeneously in the radial direction. The analysis is performed using the method of moment. It is revealed that wideband radiation characteristics, including input impedance and axial ratio, are mitigated by replacing a perfect electric conductor (PEC) reflector with the fan-shaped EBG structure.
Keywords :
antenna radiation patterns; conductors (electric); method of moments; photonic band gap; spiral antennas; axial ratio; bent-ends spiral antenna; circumferential direction; fan-shaped electromagnetic band-gap structure; input impedance; method of moment; perfect electric conductor reflector; radial direction; two-arm Archimedean spiral antenna; Dipole antennas; Impedance; Metamaterials; Periodic structures; Reflector antennas; Spirals; bent-ends spiral antenna; electromagnetic band-gap (EBG) reflector; fan-shaped EBG;
Conference_Titel :
Antennas and Propagation (EuCAP), 2015 9th European Conference on
Conference_Location :
Lisbon
