Lukas W. Mayer

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The recent emergence of short range applications, e.g. RFID (radio frequency identification), requires careful investigation of wave propagation and adequate description of the radio channel. In this contribution, we present indoor channel measurements at 868MHz that expose the transition between the near and far field as well as the effects of fading.(More)
This tutorial paper gives an overview of requirements on testbeds and rapid prototyping suitable for MIMO transmissions. Testbeds support real-time transmissions over the air and thus allow for experimenting with true physical channels, including also an analog frontend. This makes the transmission process very realistic. On the other hand, rapid(More)
In this paper we investigate the signal that is returned from an interrogator antenna when communicating with a radio-frequency identification (RFID) transponder at a carrier frequency of 866MHz. This signal contains the response of the transponder and also a part of the carrier signal that is leaking into the receive path. Depending on the type of(More)
Conventional RFID (radio frequency identification) systems operating at one single carrier frequency can hardly handle the great variety of shapes and materials that occur in products and packaging. In this contribution a dual-band antenna is presented that allows operation in the 13.56 MHz band as well as in the 868 MHz band. This provides two options to(More)
Various publications have drawn a precise picture on how correlation and capacity change when decreasing the receive-antenna distance of a 2×2 MIMO transmission to less than 0.1 λ; however, little is known on how today’s commonly employed coding schemes actually perform under such harsh conditions. In this paper, we evaluate—by measurements with a(More)
For the design of an antenna that will be directly attached to a car tire, the proximity effects due to the tire have to be considered. Measurements are performed on a dipole antenna that is mounted at the inside of the tire tread to determine the change in input impedance and resonant frequency caused by the dielectric rubber material and the metal(More)