Antenna feed

Beam (structure)

Engineering

Tilt (camera)

Beam waveguide antenna

Antenna aperture

Antenna gain

Antenna (radio)

Mechanical engineering

Coaxial antenna

Physics

Antenna measurement

Optics

Beam steering

Antenna factor

Antenna rotator

Dipole antenna

Periscope antenna

Electrical engineering

IEEE Antennas and Wireless Propagation Letters

A novel circularly polarized (CP) beam-steering four-arm curl antenna with four feed points is presented. The antenna provides steerable high-gain high-tilt right-handed CP (RHCP) beams for satellite communications. The antenna operates over a test frequency band of 1500-1670 MHz and covers the entire L1 band. The four arms are arranged symmetrically with respect to the center of the antenna, and each arm is fed by a coaxial line. When one of the four feed points is excited and the remaining feed points are either open-circuited or terminated to 50 Ω impedance, the antenna generates an RHCP tilted beam of 49° in the elevation plane. At a test frequency of 1575 MHz, the antenna provides a gain of 8.12 dBic. The antenna can switch the tilted beam in the four different space quadrants in the azimuth plane by exciting one feed point at a time. It is found that over the test band, the antenna provides a total efficiency of more than 89% and a gain of greater than 8 dBic.

A Four-Arm Circularly Polarized High-Gain High-Tilt Beam Curl Antenna for Beam Steering Applications