Title :
A circularly polarized small-size microstrip antenna with a cross slot
Author_Institution :
Res. & Dev. Center, Toshiba Corp., Kawasaki, Japan
fDate :
10/1/1996 12:00:00 AM
Abstract :
An antenna with a low profile, small size, and a light weight is required in mobile satellite communications. A new, circularly polarized small-size microstrip antenna using a proximity coupled feed method is proposed. A simple configuration based on a cross slot with unequal slot lengths on a circular patch is adopted to realize a small-size element antenna. The proposed antenna has no 90° hybrid coupler for circular polarization. The measured results verify the circular polarization, and the antenna radius was reduced by about 36% by using the slot lengths which are nearly equal to the diameter of the circular patch antenna. Good impedance and axial ratio characteristics have been obtained
Keywords :
antenna feeds; antenna testing; electric impedance; electromagnetic wave polarisation; microstrip antennas; mobile antennas; mobile satellite communication; satellite antennas; antenna radius; axial ratio characteristics; circular patch antenna; circular polarization; circularly polarized microstrip antenna; cross slot; diameter; impedance characteristics; measured results; mobile satellite communications; proximity coupled feed method; small-size microstrip antenna; unequal slot lengths; Antenna feeds; Antenna measurements; Length measurement; Microstrip antennas; Mobile antennas; Optical polarization; Patch antennas; Satellite antennas; Satellite communication; Slot antennas;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
