NDLI: Carrier extraction cancellation circuit in RFID reader for improving the Tx-to-Rx isolation

Content Provider	IET Digital Library
Author	Zhonghua, Ma Yanfeng, Jiang
Abstract	A novel high-isolation leakage carrier cancellation system, which is highly required in the ultra-high frequency (UHF) radio frequency identification (RFID) reader circuit, is presented here. First, a novel deformed microstrip rat-race circuit (RRC) is designed to take the place of traditional circulator. The microstrip device is integrated in the leakage carrier extraction circuit, which is connected in the receiver and balanced by the open-loop circuit. One of the advantages of the delicately designed system is that no need of real-time tracking to balance the variations of the amplitude and the phase of the leakage carrier. Results demonstrate that the leakage carrier with the leakage carrier extraction cancellation circuit (CECC) is improved to be 108 dB in UHF RFID narrow bands from 920 to 925 MHz and to be 117 dB at the centre frequency point. The Tx-to-Rx isolation is improved to be 48–70 dB higher than that of other cancellation circuits. The proposed leakage carrier cancellation system shows obvious improvement on the efficiency of the isolation. Both the experiment and simulation demonstrate the merits of properties of the novel designed system with the benefits of improved isolation and lower cost.
Starting Page	622
Ending Page	629
Page Count	8
ISSN	1751858X
Volume Number	13
e-ISSN	17518598
Issue Number	Issue 5, Aug (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-cds/13/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-cds.2018.5317
Journal	IET Circuits, Devices & Systems
Publisher Date	2019-02-18
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Deformed Microstrip Rat-race Circuit Frequency 920.0 MHz to 925.0 MHz High-isolation Leakage Carrier Cancellation Leakage Carrier Extraction Cancellation Circuit Microstrip Circuit Microstrip Device Microwave IC Open-loop Circuit Radiofrequency Identification RFID Reader RFID System Tx-to-Rx Isolation UHF Integrated Circuit UHF RFID Narrow Band Ultra-high Frequency Radio Frequency Identification Reader Circuit
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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