研究目的
Investigating the design and performance of a dual-cavity bandpass filter (BPF) using slot excitation on a triple-mode rectangular cavity resonator to enhance selectivity and out-of-band suppression.
研究成果
The dual-cavity BPF demonstrates enhanced selectivity and out-of-band suppression larger than 50 dB with the help of two transmission zeros, compared to a single cavity BPF. The design achieves a center frequency of 2.98 GHz with about 32 MHz bandwidth, 1.25 dB insertion loss, and greater than 12 dB return loss within the passband.
研究不足
The emergence of higher transmission poles around 3.7 GHz due to intrinsic existence of other higher-order resonant modes in a rectangular cavity.
1：Experimental Design and Method Selection:
The study involves designing a BPF using a single rectangular cavity excited by a pair of shifted inclined slots to form a passband. A dual-cavity BPF is then designed by cascading two single cavities to enhance selectivity.
2：Sample Selection and Data Sources:
The BPF is fabricated using silver-plated aluminum and microstrip lines on a PCB with specific dielectric properties.
3：List of Experimental Equipment and Materials:
Silver-plated aluminum for the cavity, PCB with dielectric constant of
4：55, thickness of 8 mm, and loss tangent of Experimental Procedures and Operational Workflow:
The BPF is designed, fabricated, and measured to validate its performance, including bandwidth, insertion loss, return loss, and suppression outside the passband.
5：Data Analysis Methods:
The performance of the BPF is analyzed based on simulated and measured results, focusing on bandwidth, insertion loss, return loss, and the presence of transmission zeros.
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