Title :
On the use of spiral antenna arrays for short-pulse ultra-wideband applications
Author :
Elmansouri, Mohamed A. ; Filipovic, Dejan S.
Author_Institution :
Dept. of Electr., Univ. of Colorado, Boulder, CO, USA
Abstract :
Seven-element hexagonal arrays based on two- and four-arm spiral elements are introduced and analyzed in frequency and time domains. Full-wave modeling based on CST Microwave Studio verifies that these arrays can work over 4:1 bandwidth with VSWR<;2.1:1, side lobe level (SLL)<; -10dB, broadside axial ratio <; 2 dB over the most operating bandwidth, appealing scanning capability over wide scan angles, and fidelity factor (FF)> 90% indicating simultaneously good time and frequency domain performances. The benefits of using the four-arm spiral antenna to achieve an array with dual-circular polarization operation and better axial ratio are demonstrated. Also, arrays´ efficiency and the complexity of the feed network of the multi-arm spiral antenna array are investigated and possible solutions are successfully demonstrated.
Keywords :
antenna arrays; antenna feeds; polarisation; spiral antennas; ultra wideband antennas; CST Microwave Studio; axial ratio; dual-circular polarization; feed network; fidelity factor; four-arm spiral antenna; full-wave modeling; seven-element hexagonal arrays; short-pulse ultra wideband antennas; spiral antenna arrays; two-arm spiral antenna; Antenna arrays; Bandwidth; Feeds; Frequency-domain analysis; Spirals; Topology; circular polarization; fidelity factor; spiral antennas; ultra-wideband;
Conference_Titel :
Phased Array Systems & Technology, 2013 IEEE International Symposium on
Conference_Location :
Waltham, MA
DOI :
10.1109/ARRAY.2013.6731816