In this paper, a novel bandpass microwave filter is designed and numerically investigated. A trisection open loop resonator is used to provide a narrow bandpass filter at 2.4 GHz. The three-pole trisection filter is not only the simplest filters by itself, but also it is the basic unit for construction of higher-degree complicated filters. Microstrip trisection filters with different resonator shapes, such as open-loop resonators and triangular patch resonators, can produce asymmetric frequency responses with an attenuation pole at finite frequency on either side of the pass band. This structure has a simple and compact shape and useful for narrow band usage.

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