Title :
Concave lens for 2.4 GHz coaxial collinear antenna
Author :
Chang, Dau-Chyrh ; Liaw, Jaw-Shien ; Chung, Ru-Chi
Author_Institution :
Dept. of EE, Da Yeh Univ., Chang-Hwa, Taiwan
Abstract :
The pattern for a COCO (coaxial collinear) antenna is omni-directional in the H-plane. In this paper, a special concave lens at 2.45 GHz is designed to improve the directivity of wire antenna in the H-plane. The lens was implemented and measured by the planar near field system at Da Yeh University. The error of the index of refraction for the designed lens by both simulation and measurement is within 1%. The quadratic phase error on the aperture of the lens in the H-plane is improved from 58.5° to 10.5°. The test results are quite in agreement with that of simulation
Keywords :
UHF antennas; antenna radiation patterns; antenna theory; lens antennas; wire antennas; 2.4 GHz; H-plane omnidirectional pattern; ISM band antenna; coaxial collinear antenna; concave lens; directivity improvement; planar near field system; quadratic phase error; refractive index error; wire antenna; Antenna measurements; Apertures; Coaxial components; Lenses; Optical design; Propagation constant; Reflector antennas; Shape; Testing; Wire;
Conference_Titel :
Microwave Conference, 2001. APMC 2001. 2001 Asia-Pacific
Conference_Location :
Taipei
Print_ISBN :
0-7803-7138-0
DOI :
10.1109/APMC.2001.985339
