研究目的
To propose a phased array antenna-fed transmitarray antenna for one-dimensional beam scanning at 10 GHz, aiming to achieve high gain, low profile, and improved scanning performance compared to traditional methods.
研究成果
The proposed PAA-fed TAA achieves effective 1-D beam scanning with a small H/D ratio, high aperture efficiency (57.5% simulated, 44.6% measured at broadside), and a gain drop of 3.13 dB simulated and 3.71 dB measured at ±30o scan angles. The planar structure facilitates integration with circuits, avoiding complex curved focal arc designs. Measured results validate the simulation, though errors exist due to fabrication and phase inaccuracies.
研究不足
The pure dielectric TAA elements with large Rhole values are difficult to fabricate, leading to hollow areas on the aperture. Fabrication and assembly errors cause discrepancies between simulated and measured results. The scanning range is limited to ±30o with gain drop, and wider scanning or reduced drop would require redesign (e.g., bifocal design) at the cost of aperture efficiency.
1：Experimental Design and Method Selection:
The design involves a transmitarray antenna (TAA) with hexagonal subwavelength low-pass elements and pure dielectric elements, fed by a phased array antenna (PAA) with printed dipole elements. Full-wave simulations under periodic boundary conditions are used to analyze transmission and reflection coefficients. The particle swarm optimization (PSO) method is employed to determine excitation coefficients for beam scanning.
2：Sample Selection and Data Sources:
The TAA elements are designed with specific dimensions (e.g., L1, L2, L3, Rhole) to control transmission properties. The PAA feed consists of 8 unequally arranged elements with integrated T/R modules.
3：List of Experimental Equipment and Materials:
Prototypes include multilayer TAA and PAA feed fabricated with dielectric substrates (εr = 3.5 and 2.2), metallic patches, and detachable SMA connectors. Measurement setup involves active element pattern measurements.
4：5 and 2), metallic patches, and detachable SMA connectors. Measurement setup involves active element pattern measurements.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Simulations are conducted in 9-11 GHz range. Measurements are performed by activating individual PAA elements and terminating others with matched loads, then synthesizing radiation patterns with optimized excitations.
5：Data Analysis Methods:
Data analysis includes calculating gain, aperture efficiency, and beam crossover levels from simulated and measured radiation patterns using array-summation method.
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