Wideband adaptive isolator for UHF RFID reader

Pekka Pursula, Ilkka Marttila, Kaj Nummila

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)


A wideband adaptive isolator for a UHF RFID reader with a minimum component count is introduced. The operation of the device is based on a reflection from a variable load, which is connected to a port of a hybrid coupler. The other ports are connected to the receiver (RX), transmitter (TX) and antenna ports of the reader. The isolator provides an isolation of 50 dB from TX to RX at the 800 MHz-1 GHz band, covering the worldwide UHF RFID bands. The adaptive system ensures high isolation up to an antenna return loss of 6 dB, or reflection coefficient of 0.5. The measured loss in the TX-to-antenna and antenna-to-RX paths is 4 dB.
Original languageEnglish
Pages (from-to)636-637
JournalElectronics Letters
Issue number12
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed


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