Universiti Teknologi Malaysia Institutional Repository

Wideband coupler for butler matrix antenna beamforming

Sabri, Muataz Watheq Sabri (2015) Wideband coupler for butler matrix antenna beamforming. Masters thesis, Universiti Teknologi Malaysia, Faculty of Electrical Engineering.


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This work focuses on the design of a Wideband Branch Line Coupler (BLC) by using open circuits coupled lines technique. The design is implemented by adding four open circuits coupled lines to the structre of the conventional Branch Line Coupler. The coupler operates at 3.8 GHz with a wideband bandwidth of 1.66 GHz, in which the fractional bandwidth is 43.69%. Then the proposed design was implemented using CST microwave tool and the simulation results of the S-parameters obtained from CST microwave simulated achieving a coupling factor of -3d and 0 phase diffrence between the two output port at the frequency of 3.8 GHz , the fabrication process and the experiment results of the proposed prototype wideband BLC was discussed and compared. The simulated results, and the measured results similar with wider bandwidth of 1.62 GHz and fractional bandwidth of 42.63% with reducation size of 28.2%.

Item Type:Thesis (Masters)
Additional Information:Thesis (Sarjana Kejuruteraan (Elektrik - Elektronik dan Telekomunikasi)) - Universiti Teknologi Malaysia, 2015; Supervisor : Dr. Noor Asniza Murad
Uncontrolled Keywords:wideband coupler, antenna beamforming, wideband BLC
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101-6720 Telecommunication
Divisions:Electrical Engineering
ID Code:48788
Deposited On:09 Nov 2015 00:18
Last Modified:24 Jun 2020 00:38

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