BANDWIDTH IMPROVEMENT FOR A MICROSTRIP-FED SERIES ARRAY OF DIELECTRICRESONATOR ANTENNAS

The impedance and pattern bandwidth of an array of dielectric resonato r antennas series fed by a microstrip line, was significantly improved by replacing individual DRAs with paired DRAs. The DRAs in each pair are spaced slightly < lambda(g)/4 apart so that their input reflection s cancel. An array of eight DRA pairs was designed and fabricated. and its performance was compared to an array of eight single elements. Th e 10dB return loss bandwidth improved from 2 to 18% and the 3dB gain p attern bandwidth improved from 12 to 17%.