A magnetic‐free in‐band full‐duplex RF front‐end with antenna balancing structure

2021 ◽  
Author(s):  
Junhyung Jeong ◽  
Girdhari Chaudhary ◽  
Yongchae Jeong
Keyword(s):  
Full Duplex ◽  
Front End ◽  
Rf Front End

A Full-Duplex Quadrature Balanced RF Front End With Digital Pre-PA Self-Interference Cancellation

2019 ◽  
Vol 67 (12) ◽  
pp. 5257-5267 ◽  
Author(s):  
Nimrod Ginzberg ◽  
Dror Regev ◽  
Genadiy Tsodik ◽  
Shimi Shilo ◽  
Doron Ezri ◽  
...  
Keyword(s):  
Interference Cancellation ◽  
Full Duplex ◽  
Front End ◽  
Rf Front End

A 0.7–1GHz tunable RF front-end module for FDD and in-band full-Duplex using SOI CMOS and SAW resonators

2017 ◽  
Author(s):  
Barend van Liempd ◽  
Akshay Visweswaran ◽  
Saneaki Ariumi ◽  
Shinya Hitomi ◽  
Ilja Ocket ◽  
...  
Keyword(s):  
Full Duplex ◽  
Front End ◽  
Rf Front End ◽  
Front End Module ◽  
Soi Cmos ◽  
Saw Resonators

scholarly journals Optimum power transfer in RF front end systems using adaptive impedance matching technique

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mohammad Alibakhshikenari ◽  
Bal S. Virdee ◽  
Leyre Azpilicueta ◽  
Chan H. See ◽  
Raed Abd-Alhameed ◽  
...  
Keyword(s):  
Impedance Matching ◽  
Adaptive Antenna ◽  
Power Transfer ◽  
Control Loops ◽  
Matching Networks ◽  
Front End ◽  
Rf Front End ◽  
Matching Technique ◽  
Digital Circuitry ◽  
Communications System

AbstractMatching the antenna’s impedance to the RF-front-end of a wireless communications system is challenging as the impedance varies with its surround environment. Autonomously matching the antenna to the RF-front-end is therefore essential to optimize power transfer and thereby maintain the antenna’s radiation efficiency. This paper presents a theoretical technique for automatically tuning an LC impedance matching network that compensates antenna mismatch presented to the RF-front-end. The proposed technique converges to a matching point without the need of complex mathematical modelling of the system comprising of non-linear control elements. Digital circuitry is used to implement the required matching circuit. Reliable convergence is achieved within the tuning range of the LC-network using control-loops that can independently control the LC impedance. An algorithm based on the proposed technique was used to verify its effectiveness with various antenna loads. Mismatch error of the technique is less than 0.2%. The technique enables speedy convergence (< 5 µs) and is highly accurate for autonomous adaptive antenna matching networks.

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