Title :
A circularly polarized hemispherical antenna for millimeter wave applications
Author :
Mohammad Haghtalab;Safieddin Safavi-Naeini
Author_Institution :
The Centre for Intelligent Antennas and Radio Systems (CIARS), Department of Electrical and Computer Engineering, University of Waterloo, ON, Canada
fDate :
7/1/2015 12:00:00 AM
Abstract :
A hemispherical helix antenna with air core for sensing application is proposed. The antenna is a specific form of resonant multi-arm helix, which operates at the center frequency of 30 GHz. Circularly polarized radiation is obtained by exciting TE11 and TM11 spherical modes. To achieve nearly perfect circularly polarized radiation over the whole upper half space in the far field region, limited ground plane with specific dimension is introduced. This provides the necessary spherical TM radiation in the far field, while making negligible changes in the near field stored energies, and without affecting the resonant characteristics of antenna.
Keywords :
"Helical antennas","Antenna radiation patterns","Microstrip antennas","Sensors","Energy storage","Polarization"
Conference_Titel :
Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2015 IEEE International Symposium on
DOI :
10.1109/APS.2015.7305434