A novel reconfigurable microstrip patch antenna with frequency and polarization diversities is proposed. A U‐slot is incorporated into a square patch, and a PIN diode is utilized to switch the slot on and off, which realizes the frequency diversity characteristic. The polarization diversities among linear polarization (LP), right‐hand circular polarization (RHCP), and left‐hand circular polarization (LHCP) are also obtained by switching three PIN diodes on the slot and the truncating corners of a square patch on and off. The antenna design and experimental results are presented.

of all the gap-coupled L-MSAs is larger, but has lower gain, as compared to that of the SMSA. CONCLUSIONA compact L-MSA has been proposed and suspended configurations have been used to increase its BW and gain. Various suspended gap-coupled L-MSA configurations have been optimized for broader BW, which yields a larger BW on the order of 22%. Although the cross-polarization levels are higher, these may be useful in the mobile-communication environments. RECONFIGURABLE MICROSTRIP-PATCH ANTENNA WITH FREQUENCY AND POLARIZATION-DIVERSITY FUNCTIONS

A novel dual band antenna for DVB-H (Digital Video Broadcasting-Handheld) and T-DMB (Terrestrial Digital Multimedia Broadcasting) services are presented. By adjusting the gap distance between the long and short bar-shape metal plates, wide and dual band properties are achieved. The proposed antenna shows good impedance and radiation characteristics for DVB-H band (470 MHz to 870 MHz) and T-DMB band (1.45 GHz to 1.48 GHz). The measured return losses over the frequency band of interest are better than -10 dB. In addition, good radiation patterns are also obtained. The measured results are compared with calculated results using Ansoft HFSS (High Frequency Structure Simulator).