Lurz, FabianFabianLurzLindner, StefanStefanLindnerMann, SebastianSebastianMannLinz, SarahSarahLinzWeigel, RobertRobertWeigelKölpin, AlexanderAlexanderKölpin2020-04-072020-04-072016-07-22IEEE Instrumentation and Measurement Technology Conference: 7520390 (2016-07-22)http://hdl.handle.net/11420/5682Surface acoustic wave (SAW) resonators are used for a broad range of wireless sensing applications, some of them having high demands on the resolution as well as the measurement update rate. This paper presents a new interrogation method for precise and fast frequency determination of passive SAW resonators based on instantaneous frequency measurement (IFM) by a low-cost Six-Port interferometer. By using a delay line, the frequency measurement is reduced to a phase measurement that can be instantaneously evaluated by the Six-Port network. No complex signal processing is necessary providing high update rates and low hardware costs. A demonstrator in the 2.4 GHz frequency band shows the feasibility and the precision of the concept with measurement times of only a few microseconds.enAllgemeines, WissenschaftConference Paper10.1109/I2MTC.2016.7520390Other