Title :
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
Abstract :
Miniaturized, cost-effective reflection type phase-modulators for 2.45 GHz based on tunable ferroelectric thick films of Ba0.6Sr0.4TiO3 (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; Ba0.6Sr0.4TiO3; 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;
Conference_Titel :
Microwave Conference, 2005 European
Print_ISBN :
2-9600551-2-8
DOI :
10.1109/EUMC.2005.1608939
