5.7GHz on-chip antenna/RF CMOS transceiver for wireless sensor networks

Abstract

This paper describes a chip-size antenna for operation at 5.7 GHz, assembled with a low-power, low-voltage RF CMOS transceiver, fabricated in UMC RF CMOS 0.18 m process. Measurements shown a patch antenna with the central frequency of 5.705 GHz, a bandwidth of 90 MHz at −10 dB of return loss, a directive gain of 0.3 dB, with an efficiency of 18%, and a transceiver with a measured total power consumption of 23 mW. This microsystem is intended for the use in each wireless node of a wireless sensor network mounted in a wireless electronic shirt, that monitors the cardio-respiratory function and posture.

Robust monitoring of vital signs integrated in textile

“…This work Carmo05 [28] Carmo06 [29] Silva [30] Fernandez-Lopez [31] Frequency between this module and other transceivers used in smart textiles [28][29][30][31] is given in Table 1.…”

RF microsystems for wireless sensors networks

“…The investigation of new frequency bands [1] and new geometries [2] will make possible to have smaller antennas to integrate in wireless microsystems [3,4]. This makes the chose of the most suitable frequency, one of the more decisive aspects in the design of RF transceivers.…”

A microchip integrated temperature sensor with RF communication channel and on-chip antenna

“…The chip size is about 2.7×2.7 mm 2 . On the same chip two identical antennas (1) (2) (3) (4) are realised, each one covering a 2×1 mm 2 surface, as shown in Fig. 1 (a), where one of the integrated antennas is highlighted by a white pattern.…”

“…Moreover, the scaling of CMOS technology is enabling circuits to operate into the centimetre wave frequency band, where the required antenna size shrinks thus making the implementation of an on-chip antenna feasible, as recently demonstrated 1,2,3 .…”