Journal
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
Volume 19, Issue 12, Pages 2211-2215Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2020.3027706
Keywords
Antenna arrays; Encoding; Ultra wideband antennas; Antenna measurements; Antenna feeds; Antenna radiation patterns; Bandwidth; 3 dB gain bandwidth; array antenna; dual beam scanning; ultrawideband
Funding
- Foundation of National Key Research and Development Program of China [2017YFA0700201, 2017YFA0700202, 2016YFC0800401]
- National Ten-Thousands Talents Plan
- National Excellent Doctoral Dissertation of China [201444]
- National Science Foundation of China [61890540, 61890544, 61890545]
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We report an ultrawideband array antenna charactered by coding method. The Vivaldi antenna is chosen as radiating element and the array antenna is fed by a 1 to 8 ultrawideband power divider network. The desired coding states are realized by position reverse of the feeding ports and the power divider network is matched by loading three optimized stepped circuited stubs. A prototype was fabricated and measured and the results show the working bandwidth is approximately 85.7% (from 4 to 10 GHz). More importantly, accurate dual-beam frequency scanning feature is demonstrated and the scanning angle ranges from 21 degrees to 54 degrees (-21 degrees to -54 degrees) when the frequency changes from 4 to 9 GHz. Also, the 3 dB gain bandwidth is ultrawide, from 4 to 10 GHz. The measured results agree well with the simulated ones. Such an ultrawideband array antenna is expected to have potential applications in near future.
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