A new compact microstrip low-pass filter and its equivalent-circuit model are developed. The philosophy if the structure behind this novel microstrip low-pass filter is simple as it is composed of a pair of symmetrical parallel coupled-line and an open-stub. With this configuration, a finite attenuation pole near the stopband cutoff frequency is available and adjustable by simply tuning the circuit parameters. Furthermore, the rejection bandwidth if this type if low-pass filter am be extended In order to validate the feasibility of the proposed design method, a low-pass filter based on a microstrip structure is designed, fabricated, and measured Experimental results agree very well with the simulation and analytical results.
1. Introduction
2. Equivalent-Circuit Model Analysis
3. Fabrication and Measurement
4. Conclusion
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