研究目的
Designing and implementing a simple 2×3 recon?gurable beam-forming network (R-BFN) for four-beam recon?guration application.
研究成果
The proposed 2×3 R-BFN with a 2-bit phase shifter successfully achieves four-beam recon?guration with good impedance matching, high port isolation, equal power division, and constant phase difference within the 2.4–2.6 GHz band. The design is simple, lossless, and uses a minimal number of components, making it suitable for applications requiring beam-forming recon?guration.
研究不足
The current implementation uses soldering technology for the 2-bit phase shifter, which may not be as reliable or efficient as MEMS technology planned for future use. The design's performance is verified within a specific frequency band (2.4–2.6 GHz), limiting its applicability to other frequencies without redesign.
1：Experimental Design and Method Selection:
The R-BFN is designed with two input ports and three output ports, incorporating a 2:1 power divider, a 90? hybrid, a 180? hybrid, and a 2-bit phase shifter. The 2-bit phase shifter switches between two states to recon?gure the constant phase differences among the output ports.
2：Sample Selection and Data Sources:
The design is simulated using commercial software Advanced Design System (ADS) and Ansoft high-frequency structure simulator (HFSS). Measurements are taken from a fabricated prototype.
3：List of Experimental Equipment and Materials:
Microstrip technology is used with PTFE substrate (εr =
4：65, thickness h = 1 mm). Components include hybrid couplers, an unequal divider with
1 power ratio, and a 2-bit phase shifter.
5：Experimental Procedures and Operational Workflow:
The R-BFN is connected to a three-element antenna array for beam-forming recon?guration verification. The 2-bit phase shifter's state is switched to observe changes in beam direction.
6：Data Analysis Methods:
Simulated and measured results are compared for return loss, port isolation, power division, and phase difference across the operation band of 2.4–2.6 GHz.
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