A dual broad band antenna with different circular polarization
- Resource Type
- Conference
- Authors
- Zhang, Hong-Lin; Lin, Lizhao; Hu, Bin-Jie
- Source
- 2017 7th IEEE International Symposium on Microwave, Antenna, Propagation, and EMC Technologies (MAPE) Microwave, Antenna, Propagation, and EMC Technologies (MAPE), 2017 7th IEEE International Symposium on. :87-91 Oct, 2017
- Subject
- Fields, Waves and Electromagnetics
Microwave antennas
Microwave propagation
Antenna feeds
Resonant frequency
Wireless communication
Polarization
Dual-frequency
frequency ratio
circular polarization
composite right-/left-handed transmission line
- Language
This paper presents a new antenna having different circular polarizations in two broad bands that are relatively close to each other. The bandwidths and their center frequency ratio are achieved with two radiating patches and a feeding circuit. Two radiating patches resonate at different frequencies offering a small frequency ratio. They take a stacked form in order to occupy less room. The feeding circuit provides signals with equal magnitudes and +/- 90° quadrature phases to the patches at their resonating frequencies. The circuit's distinctive phase character is the result of utilizing three sections of Composite Right/Left Handed (CRLH) transmission lines. The configuration leads to orthogonally feeding for the two patches. Simulated and tested results agree well and validate that the antenna has over 7% of 3dB axial ratio bandwidths at the two frequencies. Besides that, the results also show the antennas peak gains at the lower and upper frequencies are 4.95 dBic and 6.45 dBic, respectively.