Method of Suppressing the Side Lobe of a Tapered Short Leaky Wave Antenna

Author

Wu, Jin-Wei ; Wang, Chien-Jen ; Jou, Christina F.

Author_Institution

Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan

Volume

8

fYear

2009

fDate

7/1/1905 12:00:00 AM

Firstpage

1146

Lastpage

1149

Abstract

This letter demonstrates a method for suppressing the side lobe of a tapered short leaky wave antenna (LWA). The proposed LWA contains a tapered microstrip radiator with a shorting pin and two rectangular slots. This design of the two slots and the shorting pin can interfere with the current distribution of tapered LWAs to suppress the radiation of the side lobe. A matching stub is added along the feeding line to achieve impedance matching. According to the measured results, the proposed design improves the side lobe level (SLL) from 0 dB for the tapered short LWA (about 1.5lambda₀ at 4.5 GHz) to -6.13 dB for the proposed LWA at 6.4 GHz. The 7-dB impedance bandwidth is about 1.6 GHz, and the scanning range is about 43deg.

Keywords

antenna feeds; antenna radiation patterns; impedance matching; leaky wave antennas; microstrip antennas; LWA; feeding line; frequency 6.4 GHz; impedance matching; matching stub; side lobe suppression; tapered microstrip radiator; tapered short leaky wave antenna; Beam scanning; leaky wave antenna (LWA); side lobe; tapered antenna;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2009.2034474

Filename

5286261