研究目的
To design a three-way cavity crossover for narrowband and broadband applications using three fundamental modes (TE011, TE101, TM110) in a cavity resonator to achieve high isolation among channels.
研究成果
The paper successfully designs and demonstrates a three-way cavity crossover using fundamental modes with high isolation (>50 dB) for both narrowband (1.4% bandwidth at 2.91 GHz) and broadband (24% bandwidth at 3 GHz) applications. The fabricated broadband prototype shows good agreement with simulations, validating the design methodology. Future work could focus on further bandwidth enhancement and reducing insertion losses.
研究不足
The narrowband design has a limited fractional bandwidth of 1.4%, and the broadband design, while improved to 24%, may have manufacturing errors affecting performance. The unloaded Q factor in the broadband case is lower than expected (231.6 vs. 463.8), indicating potential for optimization in material or design to reduce losses.
1：Experimental Design and Method Selection:
The design utilizes the modal orthogonality of fundamental modes in a triple-mode resonator (TMR) cavity to achieve high isolation. The methodology involves filter synthesis methods for second-order (narrowband) and fifth-order (broadband) responses, with external quality factors and coupling coefficients calculated based on Butterworth and Chebyshev polynomials.
2：Sample Selection and Data Sources:
Simulations are performed using CST Studio software. A broadband crossover prototype is fabricated using silver-plated aluminum and measured with WR284-type rectangular waveguides.
3：List of Experimental Equipment and Materials:
Cavity resonators made of silver-plated aluminum, coupling slots, waveguide ports (WR284-type), and computer numerical control technology for fabrication.
4：Experimental Procedures and Operational Workflow:
The design involves placing coupling slots orthogonally to excite specific modes, adjusting slot dimensions to control Qe and K values, simulating the structure, fabricating the prototype, and measuring S-parameters to verify performance.
5：Data Analysis Methods:
S-parameter analysis is used to evaluate insertion loss, isolation, and bandwidth. Equations (2a), (2b), (3a), (3b), (4a)-(4f) are employed for theoretical calculations and parameter extraction.
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