5.8-GHz circularly polarized dual-rhombic-loop traveling-wave rectifying antenna for low power-density wireless power transmission applications

This paper reports a right-hand circularly polarized (RHCP) high-efficiency traveling-wave rectifying antenna (rectenna) designed in a coplanar stripline (CPS) circuit that is etched on a Rogers Duroid 5870 substrate with /spl epsiv//sub r/=2.2 and 20-mil thickness. A 4 /spl times/ 1 traveling-wave array of RHCP high-gain dual-rhombic-loop antennas (DRLAs) and a reflecting plane are used to provide highly efficient RF-to-DC conversion in the presence of lower power densities regardless of the rectenna's broadside orientation. The DRLA array has a circularly polarized antenna gain of 14.6 dB with a 2:1 voltage standing-wave ratio bandwidth of 17% and a better than 3 dB axial ratio fractional bandwidth of 7% centered about 5.8 GHz. The rectenna achieves 82% RF-to-DC conversion efficiency at 5.8 GHz and uses a low-profile CPS band-reject filter to suppress the re-radiated second harmonic by over 14 dB. The rectenna operating at low power density should have many applications when the transmitting power is low and/or the transmission distance is long.

[1]  William C. Brown,et al.  Electronic and mechanical improvement of the receiving terminal of a free-space microwave power transmission system , 1977 .

[2]  W.C. Brown,et al.  Experimental Thin-Film, Etched-Circuit Rectenna , 1982, 1982 IEEE MTT-S International Microwave Symposium Digest.

[3]  C. Balanis.  Antenna theory , 1982 .

[4]  Jae Choon Cha,et al.  35 and 94 GHz rectifying antenna systems , 1991 .

[5]  Kai Chang,et al.  Theoretical and experimental development of 10 and 35 GHz rectennas , 1992 .

[6]  R. L. Camisa,et al.  High efficiency C-band 1000 element rectenna array for microwave powered applications , 1992, 1992 IEEE Microwave Symposium Digest MTT-S.

[7]  Circularly polarised rhombic hula hoop antennas , 1996 .

[8]  K. Goverdhanam,et al.  Coplanar stripline propagation characteristics and bandpass filter , 1997 .

[9]  Kai Chang,et al.  A high conversion efficiency 5.8 GHz rectenna , 1997, 1997 IEEE MTT-S International Microwave Symposium Digest.

[10]  Kai Chang,et al.  Circularly polarised truncated-corner square patch microstrip rectenna for wireless power transmission , 2000 .

[11]  Kai Chang,et al.  5.8 GHz circular polarized rectifying antenna for microwave power transmission , 2001, 2001 IEEE MTT-S International Microwave Sympsoium Digest (Cat. No.01CH37157).

[12]  Z. Popovic,et al.  An experimental and theoretical characterization of a broadband arbitrarily-polarized rectenna array , 2001, 2001 IEEE MTT-S International Microwave Sympsoium Digest (Cat. No.01CH37157).

[13]  Kai Chang,et al.  A circularly polarized rectifying antenna array for wireless microwave power transmission with over 78% efficiency , 2002, 2002 IEEE MTT-S International Microwave Symposium Digest (Cat. No.02CH37278).

[14]  Kai Chang,et al.  5.8-GHz circularly polarized rectifying antenna for wireless microwave power transmission , 2002 .