A miniaturized branch-line hybrid coupler microstrip for long term evolution applications

Abstract

This paper presents the miniaturized microstrip branch-line 3dB hybrid coupler (BLHC) is designed and simulated as a platform in producing a significant reduction in the operating frequency 2.2 GHz in Long Term Evolution (LTE) application. High and low impedance transmission line are used to miniaturize the conventional Branch-Line Hybrid Coupler. The proposed branch line coupler is utilized from meander line Technique. The design and simulated results of all above components are validated by electromagnetic simulation (by Method of Momentum using the Advance Design System (ADS) tool from Agilent technologies), which confirms the theory and validates the proposed coupler design. After this validation into the simulation. The Branch-Line Hybrid Coupler which has been designed using a substrate material of FR-4 with dielectric constant (4.3), substrate thickness (h=1.570 mm). The size of the implemented branch-line 3dB hybrid coupler (BLHC) is 50x19.51mm², which is 29.72% compared to the conventional couplers for the higher LTE frequency band. Also, the reflection coefficient, the isolation and the phase difference between two output ports are as good agreement simulated results permits to confirm the designed coupler structure.