研究目的
Investigating the construction and performance of a scalable dual-polarized 256-element Ku-band SATCOM phased-array transmitter with high EIRP per polarization.
研究成果
A Ku-band 256-element SATCOM transmit phased-array was demonstrated, achieving an EIRP of 36.5 dBW per polarization and a scan range of ±60° in the E- and H-planes. The array met satellite sidelobe level requirements over its wide scan range and achieved a cross polarization level of < -27 dB up to ±45° and < -23 dB at ±60° scan angle, in both planes.
研究不足
The amplitude difference is not calibrated out and there is a ±1-1.5 dB variation between the antenna elements due to the Wilkinson network, different chip and channel electronic gains, and the cyclic variation in the phase shifter gain versus phase settings.
1：Experimental Design and Method Selection:
The design is based on 64 silicon quad-core transmit chips with 8 channels, feeding a 2x2 quad antennas with dual polarizations. The silicon core-chips are flipped directly on a 12-layer low-cost PCB with stacked patch antennas and Wilkinson dividers.
2：Sample Selection and Data Sources:
The phased-array was tested in an anechoic chamber in the far field at a range of R=1.85 m.
3：85 m.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Keysight network analyzer for pattern and frequency response measurements, 64 silicon quad-core transmit chips, 12-layer low-cost PCB, stacked patch antennas, Wilkinson dividers.
4：Experimental Procedures and Operational Workflow:
The phased-array is first calibrated by turning each element alone and measuring the S21 phase in the far field. Then, one element is set at 0°, and the other measured phases are used as calibration offsets.
5：Data Analysis Methods:
The measured EIRP and patterns are compared with simulations to validate the design.
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