Ellipse

Engineering

Radiation pattern

Telecommunications

Antenna (radio)

Physical chemistry

Polarization (electrochemistry)

Coaxial antenna

Linear polarization

Laser

Physics

Microstrip

Organic chemistry

Optics

Astronomy

Turnstile antenna

Circular polarization

Patch antenna

Azimuth

Chemistry

Axial ratio

Elliptical polarization

Ring (chemistry)

The performance of an elliptic ring as a circularly polarized antenna is studied both theoretically and experimentally. The analysis is carried out using the generalized transmission line model (GTLM). It is found from theory that if the major and the minor axes of the confocal ellipses of the ring are selected judicially, a good circularly polarized wave can be achieved over a moderately wider frequency range. The directive gain of an elliptical ring is larger by an amount of 2 to 3 dB, compared to the circular and elliptical patch antennas. An elliptical ring was designed, fabricated, and tested. The radiation patterns of the patch are measured with a uniformly rotating linearly polarized antenna. The experimental pattern shows a very good quality of circularly polarized wave with an axial ratio of less than one dB and an overall gain of about 9.5 dBi.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Elliptical ring patch antenna for circular polarization