Characterization of Band Pass Filter with Improved Design Parameters

Waveguides are robust structure and handle high power well, compared to transmission line filter such as coplanar lines, microstrips and striplines. Modeling techniques of the waveguide of the filter using the non-planner model that is most preferable among all present for low cost mass production of microwave and millimeter wave circuits and systems. The mathematical computations for the design dimensions of a wave guide band pass filter are implemented using HFSS software based on the insertion loss method. This paper basically concerned with the improvement characteristics of post coupled designs that have been modeled. This paper demonstrates the approach to overcome the limitation inherent in post coupled , hairpin as well as suppression of the harmonic which is prominent in the micro strip coupled filter and resonator topology. This has been achieved using the design concept of finite conductive post coupled obstacles into the perfect impedance match rectangular waveguide. The modified topologies of the post coupled along with the concept of reduced insertion loss and better return loss with improved quality factor has been achieved. Furthermore, presented structures results are sensitive to standard design equations and dimensions of the elements used. The resonator topologies were designed here at the center frequency of 11.2 GHz, with insertion loss -0.04dB and return loss -67.8616dB with narrow bandwidth and VSWR (Voltage standing wave ratio) =1. 05.