@article { author = {ghafari tirabadi, behnoush and Afsahi, Majid}, title = {Design of Compact Multi-Channel Diplexer Using Defected Microstrip Structure}, journal = {Journal of Communication Engineering}, volume = {8}, number = {1}, pages = {138-145}, year = {2019}, publisher = {Shahed University}, issn = {2322-4088}, eissn = {2322-3936}, doi = {10.22070/jce.2019.3860.1114}, abstract = {In this paper, two compact quad-channel and six-channel diplexer are designed and fabricated using defected microstrip structure (DMS). This structure is designed for the desired frequency based on the literature reviews. The proposed configuration is composed of a conventional T-junction divider with two pairs of open bended stubs and dual/tri-band filters. In designing dual band filters, a loop resonator loaded with two stepped-impedance resonator and defected microstrip structure. In addition, by adding a pair of open stubs, tri-band responses easily achieved without increasing the circuit size. The operating mechanism in resonance frequencies by surface current density is obtained. As a result, the multi-channel diplexer occupies a compact size of 0.13λg by 0.13λg. The measured results are fully in agreement with the simulated predictions indicating that an isolation between channels is more than 29 dB.}, keywords = {Index Terms- Compact Diplexer,Defected Microstrip Structure,Multi-Channel Diplexer}, url = {https://jce.shahed.ac.ir/article_875.html}, eprint = {https://jce.shahed.ac.ir/article_875_079ff74334e2ad87638360f739522ed3.pdf} }