Abstract
In this paper, a dual-band antenna at 4.5 GHz and 25 GHz is presented. The antenna is a low-frequency phased patch antenna array combined with a high-frequency transmitarray with a fixed beam. The lowfrequency patch antenna array and the high-frequency transmitarray feed share the same aperture area. The high-frequency transmitarray surface only uses a single substrate layer and is electrically transparent to the low-frequency phased array with beamforming. The antenna is measured to achieve an impedance bandwidth of 350 MHz and 3 GHz, and a gain of 15.4 dBi and 23.5 dBi, at S- and K-band respectively. With an impressive frequency-ratio of 5.55 and an aperture area of only 12x12cm the antenna achieves an aperture efficiency of 66% and 15% in the two bands respectively. Additionally, the low-frequency beamforming capabilities (with the existence of transmitarray surface) are measured and the antenna is shown to have a 60-degree scanning range with only a 0.22 dB gain drop-off.
Original language | English |
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Journal | IEEE Open Journal of Antennas and Propagation |
Volume | 3 |
Pages (from-to) | 1134-1140 |
Number of pages | 7 |
ISSN | 2637-6431 |
DOIs | |
Publication status | Published - Aug 2022 |
Keywords
- Antenna
- Antenna Array
- Antenna measurements
- Antennas
- Array signal processing
- Beamforming
- Dual-band
- Frequency measurement
- Gain measurement
- K-Band
- Measurement
- Nano-satellite
- Prototype
- Prototypes
- S-band
- Satellite
- Shared Aperture
- Transmitarray
- Transmitting antennas
- antenna
- measurement
- transmitarray
- K-band
- nano-satellite
- satellite
- antenna array
- prototype
- shared aperture
- beamforming