Mr. Muhammed Salah Alkafaji Profile

Muhammed Salah Alkafaji

at Univ Politehnica of Bucharest

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Proceedings Article | 20 February 2015 Paper

Design of cross-coupled planar microstrip band-pass filters using a novel adjustment method

Muhammed Alkafaji

Proceedings Volume 9258, 92580J (2015) https://doi.org/10.1117/12.2070649

KEYWORDS: Bandpass filters, Resonators, Digital filtering, Capacitors, Linear filtering, Signal attenuation, Computer aided design, Microwave radiation, Device simulation, Electronics

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In this paper the design of a cross-coupled planar microwave band-pass filter using open-loop square microstrip resonators, with two symmetrically placed attenuation poles, is presented. The design starts from the following specifications: central frequency 3GHz, 150MHz bandwidth, 1dB ripple in the pass-band corresponding to return loss of 6.8dB.The adjustment method using additional ports placed on each resonator of the filter is used, allowing the interconnection of the filter structure with external lumped elements. Connecting a reactive element (capacitor) from such an additional port to ground allows a fine tuning of the resonator. Connecting a reactive element between two such additional ports allows a fine change in the coupling coefficient between these resonators. After adding four extra ports and connecting the external elements (capacitors), it is possible to use fast circuit simulation software to optimize the filter's response. Then all these capacitors have to be gradually eliminated, by compensating their effects through fine changes back in the layouts. If some specific issues are properly handled, this procedure improves considerably the quality of the final design of the filter. After a thorough optimization of the layout, the filter was fabricated and measured. The results of measurements are in good agreement with the specifications of the filter, showing this way the efficiency of the applied optimization method.

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