Methods and systems for passive wireless surface acoustic wave devices for orthgonal frequency coded devices to implement ON-OFF sensors reusing orthogonal frequency code and distinguishing between ON and OFF states using additional PN sequence and on/off switches producing multi-level coding as well as external stimuli for switching and identification of a closure system. An embodiment adds a level of diversity by adding a dibit to each surface acoustic wave devices, thus providing four different possible coding states. The PN on-off coding can be with the dibit for coding in a multi-tag system.
US 9,097,054 B2
Application Serial Number
Assignee at Issuance
College of Engineering and Computer Science (CECS)
Electrical Engineering & Computer Science - ECE Division
Assignee at Filing
Nonprovisional Application Record
Malocha, David and Kozlovski, Nikolai, "Implementation of On-Off Passive Wireless Surface Acoustic Wave Sensor Using Coding and Switching Techniques DIV" (2015). UCF Patents. 262.