Design and Experimental Verification of a 3D Magnetic EZ Antenna at 300 MHz

Several variations of a 300-MHz version of the electrically small coax-fed three-dimensional (3D) magnetic EZ antenna were designed and tested. The final version of this low-profile antenna had an electrical size that was ka ~ 0.437 at 300.96 MHz. Nearly complete matching to the 50-Omega source and high overall efficiency (nearly 100%) were achieved. The measured fractional bandwidth was approximately 1.66%. The numerically predicted and the measured results were in good agreement. Comparisons to similar-sized loop antennas that were matched to the source with both custom-made and commercially available, general purpose external matching networks confirm the performance enhancements achieved with this metamaterial-inspired, near-field resonant parasitic antenna.

[1]  A. Erentok,et al.  A dual-band efficient metamaterial-inspired electrically-small magnetic-based antenna , 2007, 2007 IEEE Antennas and Propagation Society International Symposium.

[2]  Chia-Ching Lin,et al.  Metamaterial-inspired magnetic-based UHF and VHF antennas , 2008, 2008 IEEE Antennas and Propagation Society International Symposium.

[3]  C. Holloway,et al.  Emission and immunity standards: replacing field-at-a-distance measurements with total-radiated-power measurements , 2001, 2001 IEEE EMC International Symposium. Symposium Record. International Symposium on Electromagnetic Compatibility (Cat. No.01CH37161).

[4]  A. Erentok,et al.  Metamaterial-Inspired Efficient Electrically Small Antennas , 2008, IEEE Transactions on Antennas and Propagation.

[5]  S. Schultz,et al.  Demonstration of Impedance Matching Using a mu-Negative (MNG) Metamaterial , 2009, IEEE Antennas and Wireless Propagation Letters.

[6]  Richard W. Ziolkowski,et al.  Metamaterial-based efficient electrically small antennas , 2006 .

[7]  N. Serafimov,et al.  Comparison between radiation efficiencies of phone antennas and radiated power of mobile phones measured in anechoic chambers and reverberation chamber , 2002, IEEE Antennas and Propagation Society International Symposium (IEEE Cat. No.02CH37313).

[8]  H. Thal.  New Radiation$Q$Limits for Spherical Wire Antennas , 2006, IEEE Transactions on Antennas and Propagation.

[9]  L. J. Chu.  Physical Limitations of Omni‐Directional Antennas , 1948 .

[10]  P. Besnier,et al.  Performances of UWB Wheeler Cap and Reverberation Chamber to Carry Out Efficiency Measurements of Narrowband Antennas , 2009, IEEE Antennas and Wireless Propagation Letters.

[11]  Christopher L. Holloway,et al.  On the Use of Reverberation Chambers to Simulate a Controllable Rician Radio Environment for the Testing of Wireless Devices. | NIST , 2006 .

[12]  P.S. Hall,et al.  Small Antenna Efficiency by the Reverberation Chamber and the Wheeler Cap methods , 2005, 2005 13th IEEE International Conference on Networks Jointly held with the 2005 IEEE 7th Malaysia International Conf on Communic.

[13]  D. Hill,et al.  On the Use of Reverberation Chambers to Simulate a Rician Radio Environment for the Testing of Wireless Devices , 2006, IEEE Transactions on Antennas and Propagation.