A COMPACT NOVEL CPW-FED ANTENNA WITH SQUARE SPIRAL-PATCH FOR MULTIBAND APPLICATIONS

A compact novel coplanar waveguide-fed antenna with square spiral-patch for multiband applications is presented. The antenna consists of a square-spiral patch with two L-shape strips. With subjoin square spiral the number of frequency resonance is increasing. Also by introducing two L-shaped strips in the inside of square spiral, much wider impedance bandwidth can be produced, especially at the higher bands. The operating frequencies of the proposed antenna are 2.62/3.40/4.42/5.92/8.32 GHz. Some key parameters affecting the antenna performance have been analyzed using computer simulations. To validate the simulation results, the prototypes of the proposed antenna are fabricated on an inexpensive FR-4 substrate and tested. Good radiation characteristics of the proposed antenna have been obtained. The simulated and measured results are in good agreement. (c) 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:111-115, 2015