Submitted by Anas Hamsho Alaa Hamdi Rahaf Al Mulki  Mhd Sharif Hussain

Project supervisors  Dr. Nawaf Al Tawel Eng. Said Al Arfi

August 2014

Submitted by Hassan Al-Hameed Al-Humer  Mohammad Zaitoneh Joelle Hanna Goumana Kassam

Project Supervisor Dr. Nawwaf Altaweel Eng. Said Arfi

Feb. 2015

ABSTRACT:Branch-Line Microstrip Coupler is one of the fundamental components in RF/Microwave systems. It is a 4-Port device that divides and/or combiner power simultaneously. These features make the coupler extremely useful in various applications (GSM-Band), such as antenna feeding network, phase shifter, balance amplifier and mixer. In this project theoretical study was carried out on the characteristic of Microstrip Directional Couplers included, Isolation, Coupling, through and Directivity, which are important quantities for characterization of couplers. The AWR Program was used to establish the design of the Microstrip Coupler Circuit using element browser. Measurements S-Parameters of Microstrip Coupler Circuit were conducted and Spectrum Analyzer was used for this purpose. Although Spectrum Analyzer was used for measurements Transmission Coefficients, Coupling, Isolation, Directivity and Reflection Coefficients. Measurement errors due to tracking frequency response and mismatching in this conducted project were considered.