Farshid Yousefi - Electrical Engineering Department, Technical and Vocational College of Kermanshah
Mehran Pouraziz - Electrical Engineering Department, Technical and Vocational College of Kermanshah No. ۲, Technical and Vocational University, Kermanshah, Iran
Ali Darabi - Electrical Engineering Department, Technical and Vocational College of Kermanshah No. ۲, Technical and Vocational University, Kermanshah, Iran
Afshin Amiri - Electrical Engineering Department, Technical and Vocational College of Kermanshah No. ۲, Technical and Vocational University, Kermanshah, Iran

One of the important elements in microwave technology is the use of microstrip filters. In telecom circuits, filters are doing two important functions: Noise-canceling and separating different frequency bands.This filter is designed by using different geometric shapes on electric substrate. In this paper filter is designed with a T-shaped resonator. The resonator elements are important in determining the cutoff frequency on filter. In this paper we used the T shaped resonator because this resonator has a good sharp response in the transition band.The proposed filter has a wide bandwidth of 4.7 GHz to 27.6 GHz also the return-loss and insertion loss are more than 20 db and <0.2db and in the transition band filter has a good response and the size of filter only 0.076*0.074

Compact size, Microstrip filter, Sharp roll of, Wide stopband