Cavity-Backed Circularly Polarized Self-Phased Four-Loop Antenna for Gain Enhancement

A cavity-backed loop antenna is presented for radiating circular polarization (CP) waves and gain enhancement. The antenna is double-side printed on a substrate. It consists of two pairs of orthogonal dual square loops fed in parallel. It satisfied self-phase shift to radiate CP waves, as the smaller loop has a 90° phase ahead of the larger loop. With two more loops than dual-loop antenna, the gain can be increased to 13.5 dBic, while the size changes little. A coplanar balun is incorporated for impedance matching and simple feeding. The experimental and simulated results are in good agreement.

[1]  Four square loops antenna for circular polarisation and gain enhancement , 2010 .

[2]  Xiaomiao Zhang,et al.  Double-Sided Printed Four Rhombic-Loop Antenna with Parasitic Loops for Circular Polarization , 2009 .

[3]  Jieqiu Zhang,et al.  Dual-band bidirectional high gain antenna for WLAN 2.4/5.8 GHz applications , 2009 .

[4]  J. Laskar,et al.  Development of a Cavity-Backed Broadband Circularly Polarized Slot/Strip Loop Antenna With a Simple Feeding Structure , 2008, IEEE Transactions on Antennas and Propagation.

[5]  Manos M. Tentzeris,et al.  Bandwidth and gain improvement of a circularly polarized dual-rhombic loop antenna , 2006, IEEE Antennas and Wireless Propagation Letters.

[6]  J. Laskar,et al.  Determination of reactance loading for circularly polarized circular loop antennas with a uniform traveling-wave current distribution , 2005, IEEE Transactions on Antennas and Propagation.

[7]  Circular loop antennas reactively loaded for a uniform traveling-wave current distribution , 2005, 2005 IEEE Antennas and Propagation Society International Symposium.

[8]  K. Hirasawa,et al.  Two rectangular loops fed in series for broadband circular polarization and impedance matching , 2004, IEEE Transactions on Antennas and Propagation.

[9]  Kai Chang,et al.  5.8 GHz circularly polarized low incident power density rectenna design and array implementation , 2003, IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450).

[10]  Kai Chang,et al.  5.8-GHz circularly polarized dual-rhombic-loop traveling-wave rectifying antenna for low power-density wireless power transmission applications , 2003 .

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

[12]  Takashi Nakamura,et al.  Single‐fed crossed v‐dipoles with four masts for circular polarization , 2002 .

[13]  H. Morishita,et al.  A wideband circularly polarized dipole antenna , 1998, IEEE Antennas and Propagation Society International Symposium. 1998 Digest. Antennas: Gateways to the Global Network. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.98CH36.

[14]  Kazuhiro Hirasawa,et al.  Circularly polarised wire antenna with a dual rhombic loop , 1998 .

[15]  H. Morishita,et al.  Wideband circularly-polarized loop antenna , 1994, Proceedings of IEEE Antennas and Propagation Society International Symposium and URSI National Radio Science Meeting.

[16]  M. Bolster,et al.  A New Type of Circular Polarizer Using Crossed Dipoles , 1961 .