Impedance-matching technique for a latching ferrite variable polarizer in a circular waveguide

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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Impedance-Matching Technique for an Infrared Folded Dipole Antenna

Journal of Infrared Millimeter and Terahertz Waves ◽

10.1007/s10762-021-00784-9 ◽

2021 ◽

Author(s):

Camilo Moreno ◽

Glenn Boreman

Keyword(s):

Impedance Matching ◽

Dipole Antenna ◽

Matching Technique ◽

Folded Dipole

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A 60GHz LNA with 4.7dB NF and 18dB gain using interstage impedance matching technique in 90nm CMOS

2011 IEEE International Conference on Microwave Technology & Computational Electromagnetics ◽

10.1109/icmtce.2011.5915509 ◽

2011 ◽

Cited By ~ 4

Author(s):

Cetian Wang ◽

Yang Hao ◽

Zhang Haiying ◽

Kai Kang ◽

Zongxi Tang

Keyword(s):

Impedance Matching ◽

Matching Technique

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Rigorous study of propagation in metallic circular waveguide filled with anisotropic metamaterial

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078716000970 ◽

2017 ◽

Vol 9 (4) ◽

pp. 805-813 ◽

Cited By ~ 1

Author(s):

Hedi Sakli ◽

Mohamed Yahia ◽

Wyssem Fathallah ◽

Jun Wu Tao ◽

Taoufik Aguili

Keyword(s):

Computation Time ◽

Circular Waveguide ◽

Transverse Magnetic ◽

Higher Order Modes ◽

Anisotropic Metamaterials ◽

Matching Technique ◽

Theoretical Predictions ◽

Rigorous Study ◽

Circular Waveguides ◽

Anisotropic Metamaterial

This paper presents an extension of the formulation of wave propagation in transverse electric (TE) and transverse magnetic (TM) modes in the case of metallic circular waveguides filled with anisotropic metamaterials. The determined higher-order modes have been analyzed and exploited to the design of filters. Among the particularities of anisotropic material, the backward waves can propagate below the cut-off frequency. The numerical results for TE and TM modes have been compared with theoretical predictions. Good agreements were obtained. We analyzed a periodic structure containing waveguides filled with anisotropic metamaterial using the mode-matching technique. By using modal analysis, our approach reduced considerably the computation time compared to HFSS.

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