Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 70, Issue 11, Pages 11155-11160Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2022.3191212
Keywords
Beam scanning; low profile; mobile communications; multibeam antenna; optimization; scanning radars; transmitarray antennas
Funding
- National Aeronautics and Space Administration (NASA) Future Investigators in NASA Earth and Space Science and Technology (FINESST) Program [80NSSC19K1347]
- Onassis Foundation [FZP042-1/2019-2020]
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This paper proposes a transmitarray antenna solution that can achieve conical beam scanning. Significant advancements in the synthesis and optimization of the off-axis-fed transmitarray are required to develop an off-axis-fed transmitarray for conical beam scanning.
Conventional transmitarray antennas are designed to produce a directional pattern with the beam peak in a single direction when the feed is placed at a distinct location. A real-life application requiring conical beam scanning necessitates the development of antennas with patterns that sweep out a cone in space through successive excitation of feeds placed at multiple locations along the body of the revolution ring focus. In this communication, we propose transmitarrays as an antenna solution that can achieve the conical beam sweep. Compared to the previously reported transmitarrays, the development of an off-axis-fed transmitarray for conical beam scanning requires significant advancements regarding the synthesis and optimization of the off-axis-fed transmitarray. A novel synthesis algorithm is presented based on the optimization of the feed location and a modified transmitarray phase compensation. To validate the approach, an 18 cm transmitarray with a thickness of 0.8 cm operating at 13.4 GHz is designed, simulated, prototyped, and measured. Predictions obtained by full-wave simulations agree well with the measured results. The conical beam scanning capability of the transmitarray is demonstrated through measurements taken with the feed placed at five locations within the ring focus.
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