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In this paper, microstrip low pass filter using transmission line with the modified DCRLH structure is designed and fabricated to be removed a spurious resonant mode, and a deep attenuation in stop band. The low pass filter is composed of shunt open-stub to get a deep attenuation and series short-stub to eliminate the spurious harmonics in stop band. In this way, the spurious harmonics occurring on the higher order frequency are suppressed and the filter performance is improved. Insertion loss and VSWR of the fabricated microstrip low pass filter in the passband from DC to 1.5 GHz is 1.26 dB and 1.65, and attenuation on the stopband from 1.84 GHz to 2.18 GHz is less than -100 dB. And also this filter has a good performance for 20 watt power test.Key Words : Deep attenuation, Modified DCRLH, Shunt open-stub, Series short-stub, Spurious harmonics 0%A ATC 2013 W?#  {AEGAE . * Corresponding Author : Doo-Yeong Yang(Jeju Nat'l Univ.) Tel: +82-64-754-3636 email: yeongyd@jejunu.ac.kr Received October 17, 2013 Revised December 9, 2013 Accepted March 6, 2014

Design and Fabrication of Deep Attenuation LPF using Meander Microstrip Transmission Line