Designing and Fabrication of the Microstrip Wideband power divider based on the Pi-shaped resonator

In this paper, a novel structure of the microstrip power divider is proposed to operate for a wide range of frequencies from 1.5 GHz to 4.5 GHz containing the bands DCS, ISM and WiMAX of the wireless applications. The design of this new power divider is accomplished by transforming the lengths and impedances of the quarter wavelength sections of the conventional Wilkinson power divider into Pi-shaped sections. The study and analysis of the Pi-shaped sections technique is done in order to get a miniaturized power divider having good performances in terms of insertion loss, port matching and isolation for the three bands operating. In this work, the proposed power divider is designed and simulated by using the electromagnetic simulators ADS Agilent and CST microwave studio. The simulated results obtained by the solver are in good agreement. It is fabricated and mounted on an FR4 Substrate (er=4.4, thickness=1.58 mm), the measured results obtained are good for the three bands, and are in good agreement with the simulated ones

Design and Fabrication of the Novel Miniaturized Microstrip Coupler 3dB Using Stepped Impedance Resonators for the ISM Applications

In this work, a novel miniaturized compact coupler using the shunt-stubs artificial transimission lines with high and low impedances is presented. Design of the proposed coupler is accomplished by modifying the length and impedance of the branch lines in the conventional structure with the planar resonators in order to achieve branch line coupler with compact size and improvement of the performances. First part of this work is focusing on the theorical study of the proposed resonators where the equations are obtained. Secondly, the proposed coupler is designed on FR4 susbtrate, and simulated by using the EM Solver (ADS from Agilent technologies and CST microwave studio) in order to operate in the ISM band. The obtained results show good agreement with the simulations and the coupler shows a good perfo6rmance in the hole bandwidth. The size of the proposed coupler is reduced around 50% compared to the conventional design. The last part conerns the fabrication and test of the proposed coupler. The measurement and simulation results are in good agreements

Design and Fabrication of the Novel Miniaturized Microstrip Coupler 3dB Using Stepped Impedance Resonators for the ISM Applications

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