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In this communication, a modified bow-tie antenna is proposed and its impedance characteristics are investigated both numerically and experimentally for body-contact heartbeat detection applications. The proposed antenna consists of a bow-tie structure, a pair of T-shaped loading and stubs. The antenna parameters and body effects on the impedance bandwidth of the antenna are presented and discussed...
This paper presents quadrature demodulated data on cardiac motion from contact-based measurement using a Doppler radar and a planar antenna. Measurements were taken at several different locations on the chest of the test subject with both vertical and horizontal polarizations. Test data reveals different characteristics in terms of signal amplitude and time-domain waveform depending on the location/polarization,...
This paper reports on the design, fabrication, and measurement of a new electromechanical implementation for the mitigation of dielectric charging on the signal line and substrate for RF-MEMS shunt switches. Electrostatically shielded, externally-positioned, dielectric-less actuation electrodes with mechanical stoppers are fabricated above the MEMS bridge to isolate the RF and substrate dielectrics...
In this paper, we propose a synchronization scheme based on an improved auxiliary particle filter (IAPF) for chaotic Colpitts circuit and conduct an experimental study on the synchronization performance with application to secure communications. Specifically, with the synchronization scheme, when the chaotic signals generated by an analog Colpitts circuit are transmitted through a nonideal channel,...
This paper presents an experimental study of human cardiac motion pattern detection using Doppler radar. The measurement results show that with contact radar detection, more motion information can be detected compared with the remote detection. Besides, measurements at three chest positions confirm that cardiac motion pattern has 2-D variance on the chest plane. These detection experiments indicate...
In this paper, we conduct experimental study on the feasibility of synchronizing chaotic Colpitts circuit using particle filter, as well as its application to secure communication. The chaotic signals corrupted by channel noise are processed digitally by particle filter in the receiver with parameter mismatches, in order to obtain synchronized state of the transmitting circuit. Experiment results...
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