Nwajana, Augustine O. ORCID: https://orcid.org/0000-0001-6591-5269, Okafor, Patrick U. and Arinze, Stella N. (2020) T-junction diplexer for RF front end of a cellular base station. INTERNATIONAL JOURNAL OF MICROWAVE AND OPTICAL TECHNOLOGY, 15 (6). pp. 537-543. ISSN 1553-0396

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Abstract

A sixth order high isolation diplexer with Chebyshev channel filter characteristics is presented. The diplexer is proposed for isolating the transmit (Tx) and the receive (Rx) frequencies within the front end of a cellular base station. A novel formulation for achieving the T-junction used in distributing energy between the Tx and Rx channels is proposed. The formulation is based on the electrical length of transmission lines, and the guided-wavelength of the lines at one giga-Hertz frequency. The proposed formulation would help design engineers eliminate the uncertainties associated with repeated tuning and optimisation of T-junctions to achieve the desired energy distribution in diplexer designs. A test diplexer with Tx and Rx frequencies of 2.6 GHz and 3.0 GHz, respectively, have been designed, simulated, and presented. The design implementation is based on Rogers RT/Duroid 6010LM substrate with a 10.7 dielectric constant and 1.27 mm thickness. The circuit model and microstrip layout results of the diplexer show good agreement with a high isolation of better than 50 dB between the Tx and the Rx channels. The in-band minimum insertion loss is better than 1.1 dB, with a greater than 20 dB in-band return loss across both the Tx and the Rx bands.

Item Type:	Article
Uncontrolled Keywords:	diplexer, filter, coupling, resonator, hairpin, microstrip, T-junction
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > Centre for Wireless and Mobile Communications Research Faculty of Engineering & Science > Future Technology and the Internet of Things Faculty of Engineering & Science > School of Engineering (ENG)
Related URLs:	Publisher
Last Modified:	21 Nov 2021 01:38
URI:	http://gala.gre.ac.uk/id/eprint/30308

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