Miniaturized quad-channel microstrip diplexer with low insertion loss and wide stopband for multi-service wireless communication systems
In this paper, a compact four-channel diplexer is designed using a microstrip structure to separate input signals at 2.07/3.94 GHz and 2.37/4.49 GHz and load them on two output ports. The presented diplexer is designed utilizing a novel structure, which can be applied in modern multi-band wireless communication systems and IEEE 802.16 WiMAX that covers 3.17–4.2 GHz. This diplexer is consisting of coupled lines, a spiral cell and U-shape structures that are integrated to obtain a high performance. To create four passbands at two output ports, the proposed structure is miniaturized so that it occupies only a 0.025 λ g 2 circuit size where λg is the guided wavelength calculated at 2.07 GHz. Moreover, the low insertion losses are obtained at all channels. Another achievement of this work is obtaining a wide stopband. After the last passband, harmonics are attenuated up to 8 GHz, which is suitable for ultra wideband applications. The introduced diplexer is fabricated to confirm the design process where the measured results are in a good agreement with the simulations.
KeywordsMicrostrip Quad-channel Diplexer Wireless communication
- 5.Luo, D., Chen, F.-C., Qiu, J.-M., & Chu, Q.-X. (2015). Design of quad-channel diplexer using short stub loaded resonator. In IEEE International Conference on Wireless Symposium (IWS), 30 March–01 April, Shenzhen.Google Scholar
- 6.Chen, C.-F., Lin, C.-Y., Tseng, B.-H., & Chang, S.-F. (2015). A compact microstrip quad-channel diplexer with high-selectivity and high-isolation performances. In IEEE MTT-S International Microwave Symposium Digest, March 30, Tampa Bay.Google Scholar
- 19.Advanced Design System (ADS). (2018). Keysight Technologies. https://www.keysight.com/en/pc-1297113/advanced-design-system-ads?nid=-34346.0&cc=IR&lc=eng.