Effect of microstrip antenna substrate thickness and permittivity: comparison of theories with experiment

Author

Schaubert, Daniel H. ; Pozar, David M. ; Adrian, Andrew

Author_Institution

Dept. of Electr. & Comput. Eng., Massachusetts Univ., Amherst, MA, USA

Volume

37

Issue

6

fYear

1989

fDate

6/1/1989 12:00:00 AM

Firstpage

677

Lastpage

682

Abstract

A set of measurements of patch antennas on substrates of varying thickness and permittivity, using three types of feeds, is presented. Resonant frequency and resonant resistance are compared with calculated values from the representative theories. The measurements show that erratic results may be obtained for substrates thicker than about 0.02 λ₀, where λ₀ is the free-space wavelength at the resonant frequency. These problems may be related to coax-to-microstripline transitions, but their cause is not yet definitely known. The theoretical models that are compared give reasonably good results for resonant frequency, but none give impedance results that are consistently reliable. It thus appears that further work is needed to develop analytical models that can adequately predict the impedance performance of microstrip antennas on thick and/or high dielectric constant substrates

Keywords

electric impedance; microstrip antennas; permittivity; substrates; coax-to-microstripline transitions; free-space wavelength; high dielectric constant substrates; impedance performance; microstrip antennas; patch antennas; permittivity; resonant frequency; resonant resistance; substrate thickness; theoretical models; Antenna measurements; Electrical resistance measurement; Feeds; Frequency measurement; Microstrip antennas; Patch antennas; Permittivity measurement; Resonance; Resonant frequency; Thickness measurement;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.29353

Filename

29353