Design and Performance Analysis of 2.45 GHz Microwave Multilayer Interdigital Band Pass Filter

Filters with advanced features have numerous applications in many modern technologies. Microwave bandpass filter is one of those filters that can be used for wireless communication .This paper emphasis how to design an interdigital microwave bandpass filter for 2.45GHz. So, this paper focuses on the design of parallel coupled line bandpass filter, two sets of interdigital band-pass filter at 2.45 GHz on single and multilayer structure, compare among these filters, proposed one suitable for users. Primarily coupled line filter, then asymmetrical and symmetrical interdigital band pass filters have been designed for single and multilayer structure. Simulated results are very close to the desired response. The results showed that each filter works well at operating frequency. Asymmetric filters have excellent return loss at center frequency, very sharp roll off factor. In contrast, symmetrical interdigital band-pass filters have narrow bandwidth and minimized ripple. Finally, the multilayer configuration with dielectric substrates showed that the bandwidth is broaden up, insertion loss and return loss are reduced than single layer configuration. Key words— Interdigital Bandpass Filter, Microstripline, Coupled-line, ADS, Sonnet, SAI, SSI, MAI, and MSI.