Vol. 128

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2012-05-14

Switchable Distance-Based Impedance Matching Networks for a Tunable HF System

By Wang-Sang Lee, Han-Lim Lee, Kyoung-Sub Oh, and Jong-Won Yu
Progress In Electromagnetics Research, Vol. 128, 19-34, 2012
doi:10.2528/PIER12041205

Abstract

Distance-based impedance matching networks for a tunable high frequency (HF) system are presented in this paper for the improved performance. The transmitting antenna for a HF system with an operating frequency of 13.56 MHz consists of a two-turn loop and three channel impedance matching networks corresponding to the distance of the receiving antenna. Each impedance matching network maximizes the system performance such as uniform power efficiency and reading range at specific distance between a transmitting and a receiving antenna. By controlling the distance-based matching networks, the power efficiency of the proposed antenna improves by up to 89% compared to the conventional antenna system with the fixed matching (FM) condition for distances, and the reliable reading range according to the impedance matching conditions is also increased. The proposed technique is applicable for near field communication (NFC), radio frequency identification (RFID), or wireless power transfer (WPT) devices.

Citation


Wang-Sang Lee, Han-Lim Lee, Kyoung-Sub Oh, and Jong-Won Yu, "Switchable Distance-Based Impedance Matching Networks for a Tunable HF System," Progress In Electromagnetics Research, Vol. 128, 19-34, 2012.
doi:10.2528/PIER12041205
http://jpier.org/PIER/pier.php?paper=12041205

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