研究目的
To design and measure variable phase shifters on triplicate suspended transmission lines in the X-band for radar applications, aiming to achieve low losses and good performance.
研究成果
The designed phase shifters exhibit good frequency behavior with measured losses less than 1.2 dB, demonstrating effectiveness for low-loss applications in X-band radar systems. Future work could focus on extending the phase shift range and bandwidth.
研究不足
The loaded line phase shifting circuits are limited to small phase shifts (less than 90°) due to misadaptation issues; the design is narrowband.
1：Experimental Design and Method Selection:
The design utilizes loaded line phase shifters on suspended transmission lines to achieve phase shifts with low losses. PIN diodes (MACOM MA4SPS502) are used as switches for controlling susceptance values. The theoretical model involves lambda-quarter separation for mutual reflection cancelling.
2：Sample Selection and Data Sources:
Prototypes of phase shifters (1-bit 11° and 22°) and passive devices (suspended transmission line, power dividers) are fabricated and measured.
3：List of Experimental Equipment and Materials:
Roger RO4003C substrate (thickness
4：508 mm, dielectric constant 38, loss tangent 0027), PIN diodes (MACOM MA4SPS502), CST Studio Suite for simulations. Experimental Procedures and Operational Workflow:
Design and simulate phase shifters using CST Studio Suite; fabricate prototypes; measure reflection and transmission coefficients, amplitudes, and phase shifts using appropriate measurement setups.
5：Data Analysis Methods:
Analyze simulation and measured results for amplitude, phase, and losses; compare with theoretical expectations.
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