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    Item type:Publication, Access status: without files ,
    Thinned MIMO arrays with constrained element spacing for imaging radar
    (2012-10)
    Rezer, Kamil
    ;
    Jacob, Arne F.
    Thinned multiple-input multiple-output (MIMO) antenna arrays with constrained element spacing are considered for imaging radar. It is shown that, in contrast to classical MIMO arrays, the minimum element spacing can be chosen to be a multiple of half the wavelength. Possible array configurations are found numerically, the minimum element spacing being set to some multiple of half the wavelength. Exemplary experimental verification is provided at K a-band with a 4-transceiver array in a radar application.
    Publicationtype: Conference Paper
      28
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    Initial calibration procedure of a six-port receiver system for complex data reception
    (2012-10)
    Lindner, Stefan
    ;
    Barbon, Francesco
    ;
    Vinci, Gabor
    ;
    Weigel, Robert
    ;
    Kölpin, Alexander
    In this publication a six-port receiver system for reception of modulated I/Q-data is shown. The system contains of passive six-port and diode structures to mix the signal to baseband. After digitizing the baseband voltages, a complex vector can be calculated. The binary data reconstruction is done by mapping these complex vector to the correct data symbol in the constellation diagram. Therefore, the data rate has to be reconstructed as described here. Furthermore, a simple calibration technique is explained and some measurements are taken to prove the functionality of the system and the simulation results.
    Publicationtype: Conference Paper
      75
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    Item type:Publication, Access status: without files ,
    24 GHz six-port medical radar for contactless respiration detection and heartbeat monitoring
    (2012-11)
    Vinci, Gabor
    ;
    Lindner, Stefan
    ;
    Barbon, Francesco
    ;
    Hofmann, Sebastian
    ;
    Fischer, Georg
    For numerous medical applications it is of primary interest to monitor the breath rate and heartbeat of a patient over time. Especially important is to observe the respiration of a patient over night to detect potential sleep disorders. Furthermore, heartbeat frequency is also a precious information which can help to improve diverse diagnosis procedures. In order to better analyze these vital parameters an innovative contactless respiration detection and heartbeat monitoring technique has been developed. This novel method is based on the six-port interferometric radar and is capable of detecting breath rate as well as heartbeat frequency without applying sensors or electrodes on the patients body.
    Publicationtype: Conference Paper
      120