Title :
Dielectric cover effect on rectangular microstrip antenna array
Author_Institution :
Dept. of Electr. Eng., Ben-Gurion Univ. of the Negev, Beer-Sheva, Israel
fDate :
8/1/1994 12:00:00 AM
Abstract :
A theoretical model to analyze a covered rectangular antenna with an arbitrary dielectric constant superstrate is developed. The antenna is simulated by the radiation of two magnetic dipoles located at the radiating edges of the patch. The Green´s function of an elementary magnetic dipole in a superstrate-substrate structure, utilizing spectral-domain analysis, is formulated, and the surface-wave and radiation field are computed. An improved transmission line model, which considers the stored energy near the radiating edges and the external mutual coupling, is used to compute the input impedances and radiation efficiency. Design considerations on the superstrate thickness and its dielectric constant are discussed. Experimental data for a single element and a 4×4 microstrip array is presented to validate the theory
Keywords :
Green´s function methods; antenna accessories; antenna radiation patterns; electric impedance; magnetic moments; microstrip antennas; microwave antenna arrays; permittivity; spectral-domain analysis; transmission line theory; Green´s function; design; dielectric constant; dielectric cover effect; external mutual coupling; input impedances; magnetic dipoles radiation; radiating edges; radiation efficiency; radiation field; radiation pattern; rectangular microstrip antenna array; spectral-domain analysis; stored energy; superstrate; superstrate thickness; superstrate-substrate structure; surface-wave; theoretical model; transmission line model; Antenna theory; Computational modeling; Dielectric constant; Dipole antennas; Green´s function methods; Magnetic analysis; Microstrip antenna arrays; Microstrip antennas; Mutual coupling; Transmission line theory;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
