Design of Closed Loop Dual Band Bandpass Filter Using Two Different Size Cascaded Open Loop Triangular Ring Resonator

摘要

This paper presents a dual band bandpass microstrip filter using different size cascaded conventional open loop triangular ring resonator for various application in microwave communication at 7.2 GHz and 13.8 GHz. The filter is less complex since no via or defected ground structures are used. The rejection performance is improved due to the introduction of cascade method in design of filter. Stop band has several attenuation poles to improve the selectivity of the proposed bandpass filter. The two passband is separated by wide stop band. A wide upper stop band is also obtained. The proposed filter is designed and simulated in Agilent ADS.