Title :
Achieving high directivity-bandwidth through flat GRIN superstrates in Fabry-Perot cavity antennas
Author :
Hashmi, Raheel M. ; Esselle, Karu P. ; Hay, Stuart G.
Author_Institution :
Dept. of Eng., Macquarie Univ., Sydney, NSW, Australia
Abstract :
The use of flat dielectric surfaces having a radial gradient of permittivity is investigated for use as superstrates in Fabry-Perot cavity (FPC) antennas. The use of such surfaces results in a varied reflectivity within the FPC and makes the boresight emissions spatially coherent. This results in a significantly enhanced gain-bandwidth product of a FPC antenna using only a single feed. The key advantage of such GRIN surfaces is their all-dielectric, flat and thin nature. A prototype FPC antenna is numerically investigated to study the feasibility of this concept. Half power directivity-bandwidth as high as 51% is recorded with peak directivity of 17.6 dBi.
Keywords :
antenna feeds; dielectric devices; dielectric materials; numerical analysis; FPC antenna; Fabry-Perot cavity antenna; antenna feed; flat GRIN superstrates; flat dielectric surface; gain-bandwidth product enhancement; half power directivity-bandwidth; numerical analysis; radial permittivity gradient; spatially coherent boresight emission; Bandwidth; Broadband antennas; Cavity resonators; Dielectric resonator antennas; Dielectrics;
Conference_Titel :
Antennas and Propagation Society International Symposium (APSURSI), 2014 IEEE
Conference_Location :
Memphis, TN
Print_ISBN :
978-1-4799-3538-3
DOI :
10.1109/APS.2014.6905200
