A circularly polarized rectifying antenna array for wireless microwave power transmission with over 78% efficiency

Author

Strassner, B. ; Kai Chang

Author_Institution

Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA

Volume

3

fYear

2002

fDate

2-7 June 2002

Firstpage

1535

Abstract

This paper reports a new circularly polarized (CP) high gain, high-efficiency rectifying antenna (rectenna) array designed in a coplanar stripline circuit. The array can maintain a constant DC output voltage regardless of its broadside orientation. Each antenna has a CP antenna gain of 11 dB and a better than 1 dB axial ratio fractional bandwidth of 4.7%. Coplanar stripline (CPS) band-reject filters (BRF) are used to suppress the re-radiated harmonics by more than 19 dB. At 5.61 GHz, using an array loading of 150 /spl Omega/, a 3/spl times/3 rectenna array achieves an RF-to-DC conversion efficiency of 78% and an axial ratio of 0.25 dB.

Keywords

band-stop filters; coplanar transmission lines; electromagnetic wave polarisation; harmonics suppression; microwave antenna arrays; microwave power transmission; rectification; strip line circuits; 11 dB; 150 ohm; 5.61 GHz; 78 percent; RF-to-DC conversion efficiency; axial ratio fractional bandwidth; band-reject filter; circularly polarized rectifying antenna array; coplanar stripline circuit; harmonic suppression; rectenna array; wireless microwave power transmission; Band pass filters; Capacitors; Dipole antennas; Gain; Microwave antenna arrays; Polarization; Power harmonic filters; Power transmission; Rectennas; Schottky diodes;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2002 IEEE MTT-S International

Conference_Location

Seattle, WA, USA

ISSN

0149-645X

Print_ISBN

0-7803-7239-5

Type

conf

DOI

10.1109/MWSYM.2002.1012148

Filename

1012148