A non-linear commercial topology of passive RFID tag is transported onto a low-cost flexible substrate by means of antenna embedded distributed decoupling capacitors, which allow to embed both a far-field antenna, operating at 2.4 GHz, and a near-field antenna, operating at 27 MHz, into a compact low-cost layout. The sensor is based on two co-designed planar antennas and a demodulating diode, which receives a two-tone gigahertz signal and radiates back their frequency difference. Filtering elements are embedded directly into the antennas to decouple the near-field and far-field section. The layout transport is realized using silver ink printing on a flexible plastic substrate and can be used for instance as soil moisture sensor when a simple planar capacitance is added to the design. Two-tone measurements of the sensor show the amplitude of the 2nd order intermodulation product at 27 MHz to be only 9 dB lower than the 3rd intermodulation product at 2.400 GHz – 27 MHz, thanks to the high non-linearity of the sensor and the decoupling effect of the distributed capacitors in the metal traces of the folded-slot antenna topology.@en

We present experimental results for an integrated coplanar phase shifter based on varactor diodes fabricated using a silicon on glass process. A differential phase shift of 180 degrees is obtained at 50 GHz with the dc bias voltage varied between 2.1 and 15 volts. The return loss of the phase shifter is below 15 db. The insertion loss strongly depends on the dc bias voltage applied, but is below 14 db in the bias range of interest.@en