Int. J. of Wireless and Mobile Computing   »   2015 Vol.8, No.1

 

 

Title: Miniaturised broadband branch line coupler for WiMAX and LTE applications

 

Authors: Krishnan Thiyagarajan; Thangavelu Kesavamurthy; Karuppaiah Alagar Banupriya; Raja Sindhuja

 

Addresses:
Department of Electronics and Communication Engineering, PSG College of Technology, Coimbatore, India
Department of Electronics and Communication Engineering, PSG College of Technology, Coimbatore, India
Department of Electronics and Communication Engineering, PSG College of Technology, Coimbatore, India
Department of Electronics and Communication Engineering, PSG College of Technology, Coimbatore, India

 

Abstract: This paper presents the bandwidth enhancement and miniaturisation of the branch line coupler for LTE/WiMAX applications (2.45-2.7 GHz). The broadband nature of conventional branch line coupler is attained by using three-section branch line coupler. The circuit area of the broadband coupler is reduced with the aid of von Koch fractal method of miniaturisation. An FR4 (Flame Retardant type 4 Epoxy) substrate having a thickness of 1.6 mm is selected to construct the microstrip circuit of broadband and miniaturised broadband branch line couplers. S-parameter simulation is carried out to compare the performance of proposed miniaturised broadband coupler with broadband and conventional branch line couplers. The simulation result shows that the proposed coupler achieves a bandwidth of 610 MHz with an area reduction of around 34%. The printed circuit board fabrication of the conventional, broadband and miniaturised broadband coupler was done to evaluate the measurement results using vector network analyser.

 

Keywords: branch line couplers; directional couplers; Koch fractal; microstrip; broadband; miniaturisation; bandwidth enhancement; WiMAX; LTE; miniaturised broadband coupler; simulation.

 

DOI: 10.1504/IJWMC.2015.066748

 

Int. J. of Wireless and Mobile Computing, 2015 Vol.8, No.1, pp.66 - 73

 

Date of acceptance: 02 Jun 2014
Available online: 02 Jan 2015

 

 

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