Omnidirectional Loop Antenna With Left-Handed Loading

This letter presents an omnidirectional horizontally polarized planar printed loop-antenna using left-handed CL loading with 50-Omega input impedance. The antenna has a one wavelength circumference and gives an omnidirectional pattern in the plane of the loop, whilst working in an n = 0 mode. In contrast, a conventional right-handed loop, with the same dimensions, has a figure of eight pattern in the plane of the loop. The antenna is compared with other right-handed periodically loading loop antennas and shown to have the best efficiency and is much easier to match. Design details and simulated results are presented. The concept significantly extends the design degrees of freedom for loop antennas.

[1]  C.-C. Lin,et al.  A 2.4 GHz planar printed antenna with omni-directional horizontally polarized pattern for WLAN applications , 2003, 33rd European Microwave Conference Proceedings (IEEE Cat. No.03EX723C).

[2]  T. Itoh,et al.  A novel composite right-/left-handed coupled-line directional coupler with arbitrary coupling level and broad bandwidth , 2004, IEEE Transactions on Microwave Theory and Techniques.

[3]  P. Hall,et al.  Left-Handed Dipole Antennas and Their Implementations , 2007, IEEE Transactions on Antennas and Propagation.

[4]  P.S. Hall,et al.  A Left-Handed Dipole Concept , 2006, IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006..

[5]  Chi-Chang Lin,et al.  A 2.4GHz omni-directional horizontally polarized planar printed antenna for WLAN applications , 2003, IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450).

[6]  T. Itoh,et al.  Composite right/left-handed transmission line metamaterials , 2004, IEEE Microwave Magazine.

[7]  K.M.K.H. Leong,et al.  Design of resonant small antenna using composite right/left-handed transmission line , 2005, 2005 IEEE Antennas and Propagation Society International Symposium.

[8]  T. Itoh,et al.  NOVEL ZEROTH-ORDER RESONANCE IN COMPOSITE RIGHT/LEFT- HANDED TRANSMISSION LINE RESONATORS , 2003 .

[9]  Tatsuo Itoh,et al.  Dominant mode leaky-wave antenna with backfire-to-endfire scanning capability , 2002 .

[10]  R. Jakoby,et al.  Design of compact planar antennas using LH-transmission lines , 2004, 2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535).

[11]  T. Itoh,et al.  Transmission line approach of left-handed (LH) materials and microstrip implementation of an artificial LH transmission line , 2004, IEEE Transactions on Antennas and Propagation.

[12]  H. Iizuka,et al.  Dipole Antenna With Left-Handed Loading , 2006, IEEE Antennas and Wireless Propagation Letters.

[13]  T. Itoh,et al.  Composite right/left-handed /spl lambda/-resonator ring antenna for dual-frequency operation , 2005, IEEE Antennas and Propagation Society International Symposium.

[14]  P.S. Hall,et al.  Omnidirectional left-handed loop antenna , 2006, 2006 IEEE Antennas and Propagation Society International Symposium.