Title :
Endfire microstrip log periodic array
Author_Institution :
Wolfson RF Eng. Centre, R. Mil. Coll. of Sci., Swindon, UK
Abstract :
A switched array of quarter-wavelength shorted microstrip patches in a log-periodic arrangement is shown to give endfire radiation over greater than a 20% bandwidth. Extension to greater bandwidths is possible with this configuration, although the limitations imposed by the use of a flat substrate will also apply in this case. Radiation-pattern control is seen to be the most critical design aspect, due to perturbations from transition radiation, ground-plane edge effects, and the possible generation of substrate surface waves.<>
Keywords :
antenna radiation patterns; microstrip antennas; microwave antenna arrays; endfire log-periodic array; flat substrate; ground-plane edge effects; microstrip antenna array; quarter-wavelength shorted microstrip patches; radiation pattern control; substrate surface waves; switched array; transition radiation; Bandwidth; Broadband antennas; Degradation; Dielectric constant; Dipole antennas; Feeds; Gratings; Log periodic antennas; Microstrip antenna arrays; Microstrip antennas;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1988. AP-S. Digest
Conference_Location :
Syracuse, NY, USA
DOI :
10.1109/APS.1988.94101
