Design of A Microstrip Maximally Flat 7 th Order Lowpass Filter Using ADS Simulation

Abstract

This work presents the design and analysis of a 7th order microstrip maximally flat low pass filter using insertion loss method in X-band range. The cutoff frequency at 10 GHz. An attenuation of more than 60 dB is obtained. The low pass filter was designed and simulated using Advanced Design System (ADS) software. The filter is implemented on Alumni substrate having a dielectric loss of 9.6 and substrate height of 1.6 mm. In addition, an optimization process for the stub lengths and widths is performed based on desired filter specifications. Due to coupling effect between adjacent stubs, the desired filter specifications become difficult to be achieved and the optimization process can solve for that by defining thresholds that match the desired filter specifications.