Oral Presentation , Page 343-349 (7)

Volume Title: 2nd IEEE International Conference on Electronic Eng., Faculty of Electronic Eng., Menouf, Egypt, 3-4 July. 2021

¹Abdel-Aziz Shalaby ; ²Ramy Khattab

¹EEC Dept. , Faculty of Electronic Engineering , Menofia University

²EEC Dept., Faculty Electronic Engineering, Menofia University, Egypt

This paper presents a design of a compact broadband two-section branch-line coupler (BLC) based on Dual Composed Right Left Hand (D-CRLH) Metamaterial at a center frequency of 1.8 GHz. To realize a good miniaturization, a V-shape coupled-line sections unit cell has been suggested and analyzed. It achieves very good characteristics without using lumped elements, via holes or defected ground structures. The designed coupler has been simulated using the CST software, fabricated, and measured. The comparison between the simulated and measured results shows good agreement. It has a fractional bandwidth of 51.6% and a size reduction of 44.6 % comparing to the conventional coupler. As an application, the proposed coupler has been used to build a balanced amplifier. For this purpose, a microwave transistor amplifier has been designed and simulated at the center frequency, 1.8GHz. The simulated results of the balanced amplifier show a good flat gain over a 1 GHz bandwidth with 13.7 dB gain at the central frequency, 1.8 GHz.

Branch-line couplers; D-CRLH unit cells; balanced amplifier; microwave circuits