Sm. Deng et al., IMPEDANCE CHARACTERISTICS OF MICROSTRIP ANTENNAS EXCITED BY COPLANAR WAVE-GUIDES WITH INDUCTIVE OR CAPACITIVE COUPLING SLOTS, IEEE microwave and guided wave letters, 5(11), 1995, pp. 391-393
A rectangular microstrip antenna fed by a coplanar waveguide with an i
nductive or a capacitive coupling end slot is analyzed by using the mo
ment method. Numerical calculations for the input impedances are shown
to agree well with those of the measurements. For the purpose of desi
gn, a parameter study for the variations of input impedance with lengt
h and width of the coupling slot is presented. Differences in the inpu
t impedance characteristics between the inductive and capacitive coupl
ing cases are also discussed.