Physics

Microstrip

Ground plane

Turnstile antenna

Optics

Slot antenna

Multi-band device

Physical chemistry

Circular polarization

Return loss

Microstrip antenna

Antenna (radio)

Chemistry

Polarization (electrochemistry)

Axial ratio

Computer science

PIN diode

Diode

Optoelectronics

Telecommunications

IEEE Antennas and Wireless Propagation Letters

This letter presents a novel dual-band circularly polarized slot antenna. The far-field polarization of the antenna can be switched electronically between left-hand circular polarization and right-hand circular polarization. A 50 Ω microstrip feed line is divided into four arms those excite a ground plane slot. The p-i-n diodes are introduced in the arms for polarization switching. A prototype dual-band dual-sense antenna with f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> = 2.4 GHz and f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">02</sub> = 5.2 GHz is fabricated using a 1.6 mm thick FR4 substrate. The measured 3 dB axial ratio bandwidths are more than 16.6% and 5.7% at the lower and upper bands, respectively. The measured return loss is more than 10 dB over the wireless local area network (LAN) bands.

Dual-Band Dual-Sense Polarization Reconfigurable Circularly Polarized Antenna