Aperture-coupled patch antenna on UC-PBG substrate

Author

Coccioli, Roberto ; Yang, Fei-Ran ; Ma, Kuang-Ping ; Itoh, Tatsuo

Author_Institution

Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA

Volume

47

Issue

11

fYear

1999

fDate

11/1/1999 12:00:00 AM

Firstpage

2123

Lastpage

2130

Abstract

The recently developed uniplanar compact photonic bandgap (UC-PBG) substrate is successfully used to reduce surface-wave losses for an aperture-coupled fed patch antenna on a thick high dielectric-constant substrate. The surface-wave dispersion diagram of the UC-PBG substrate has been numerically computed for two different substrate thickness (25 and 50 mil) and found to have a complete stopband in the frequency range of 10.9-13.5 and 11.4-12.8 GHz, respectively. The thicker substrate is then used to enhance broadside gain of a patch antenna working in the stopband at 12 GHz. Computed results and measured data show that, due to effective surface-wave suppression, the antenna mounted on the UC-PBG substrate has over 3-dB higher gain in the broadside direction than the same antenna etched on a grounded dielectric slab with same thickness and dielectric constant. Cross-polarization level remains 13 dB down the co-polar component level for both E- and H-planes

Keywords

microstrip antennas; photonic band gap; substrates; 10.9 to 13.5 GHz; 11.4 to 12.8 GHz; aperture-coupled patch antenna; cross-polarization; electromagnetic crystal; gain; grounded dielectric slab; surface wave dispersion diagram; uniplanar compact photonic bandgap substrate; Antenna measurements; Dielectric losses; Dielectric measurements; Dielectric substrates; Directive antennas; Frequency; Gain measurement; Optical losses; Patch antennas; Photonic band gap;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.798008

Filename

798008