Abstract
Objectives: This study presents a novel architecture of a six-port demodulator operating at 2.45 GHz. The new structure of the six-port junction was based on a branch-line coupler and made up of a Wilkinson power divider and three 90°-hybrid coupler. Methods: The six-port design was accomplished using HMSIW technology. Simulation was carried out using ADS software of Agilent technologies and HFSS software. Then, an RF-DC conversion circuit was optimized and designed. Our choice fell on a Schottky diode-based power detector and a resistive adaptation to its input. Subsequently, to validate this system we have assembled these two circuits using a co-simulation Harmonic Balance-momentum. Then the six-port configuration was connected to power detectors to show its performance as a demodulator circuit. Finally, the use of an appropriate algorithm on MATLAB allowed us to extract the amplitudes of the four output signals as a function of the phase difference between the two input signals. Findings: The obtained results showed that the six-port junction has good performances in terms of phase difference, return loss, reflection and isolation. We conclude that the six-port junction, designed as a phase discriminator, has the best qualities for demodulating an RF signal. Application: For each output voltage we have a phase shift for which the corresponding power is canceled so the power detector allows, by measuring the output powers and by detecting the one that is minimal compared to the others, to differentiate the four states of modulation which highlights the good behavior of our system. Keywords: Six-port junction, HMSIW, Power detector, Linearization, QPSK demodulation
Highlights
Taking advantages of developments in the fields of integrated circuits and microwaves, the six-port technique was introduced in 19771 - 2
We present a new structure of a six-port junction and a power detector device to show the comportment of the system as a QPSK demodulator
The six-port junction is composed of three branch line couplers and a Wilkinson power divider based on HMSIW technology
Summary
Taking advantages of developments in the fields of integrated circuits and microwaves, the six-port technique was introduced in 19771 - 2. The six-port reflectometer is a microwave measurement device that can be used to determine the reflection coefficient of a device or alternatively to find the ratio in modulus and phase between two different signals[3,4]. It is a passive and linear circuit consisting of two input ports one is connected to an RF source and the other one is connected to the device to be characterized, and four output ports connected to four power detectors. He proposed à new concept of direct conversion digital receiver based on a six-port network
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