Abstract:
An efficient analytical model to design wideband
microstrip spurline band-stop filter (BSF) is proposed. The geometrical parameters of the BSFs are
optimized using simulation for the entire range of the
desired operating frequency (1-5 GHz) and the results
indicated relatively inferior performance of the filters
designed using conventional analytical model.
Whereas, in the proposed model, a mathematical
function is found by curve fitting of the optimal data
set of geometrical parameters optimized by simulation. Therefore, the filters designed using the proposed model achieve almost optimal performance in
terms of rejection ratio, bandwidth, and so on, and a
better match between desired and actual operating
frequency as compared with the conventional design
model. To corroborate the claims, the filter prototypes designed using the proposed and conventional
models are fabricated and tested. The measured
results showed agreement with the simulation results
and proved effectiveness of the proposed analytical
model to design spurline BSF. The error limit for the
proposed model is found within 0.005% of the optimal design.
