Passive ferroelectric phase modulators for RFID backscatter transponders

Author

Scheele, Patrick ; Tomescu, Vlad ; Giere, Andre ; Mueller, Stefan ; Jakoby, Rolf

Author_Institution

Inst. of Microwave Eng., Darmstadt Univ. of Technol., Germany

Volume

1

fYear

2005

fDate

4-6 Oct. 2005

Abstract

Miniaturized, cost-effective reflection type phase-modulators for 2.45 GHz based on tunable ferroelectric thick films of Ba_0.6Sr_0.4TiO₃ (BST) have been realized. Low cost screen printing technology is used for the substrate fabrication. The circuit area is below 2.4 mm². The return loss of the first modulator is between 2.2 dB and 3.8 dB with a reflection phase shift of 72° and between 2.0 dB and 3.4 dB with a reflection phase shift of 71° for the second modulator. A third modulator design offers a DC-grounded RF port and a separate RF-decoupled modulation port.

Keywords

barium compounds; ferroelectric devices; ferroelectric materials; microwave devices; modulators; phase modulation; radiofrequency identification; strontium compounds; thick film devices; titanium compounds; transponders; 2.0 to 3.4 dB; 2.2 to 3.8 dB; 2.45 GHz; BST; Ba_0.6Sr_0.4TiO₃; DC-grounded RF port; RF-decoupled modulation port; RFID backscatter transponders; cost-effective phase-modulators; ferroelectric phase modulators; ferroelectric thick films; low cost screen printing technology; passive phase modulators; reflection type phase-modulators; substrate fabrication; tunable thick films; Backscatter; Binary search trees; Ferroelectric materials; Phase modulation; Radiofrequency identification; Reflection; Strontium; Thick films; Transponders; Tunable circuits and devices;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2005 European

Print_ISBN

2-9600551-2-8

Type

conf

DOI

10.1109/EUMC.2005.1608939

Filename

1608939