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FDTD analysis of APFA array as a receiving elements for real time PMMW imaging has been presented. It has been demonstrated that the mutual coupling among APFA elements significantly decreases by the presence of corrugation. Furthermore, an axially symmetric array element pattern having a beam width of about 60deg is obtained for the 9 times 9 element APFA array, which is suitable for f/D=1 optics...
A compact receiver module for a 94 GHz band passive millimetre-wave (PMMW) imaging system is developed. This receiver module consists of an antipodal linearly tapered slot antenna (LTSA) and microwave monolithic integrated circuit (MMIC) with flip-chip bonding assembly that provides high radio frequency (RF) performance at low cost. A new microstrip-slot transition developed for the LTSA/MMIC interface...
Broadband, high resolution millimeter-wave imaging radar using inline transmitting (Tx) and receiving (Rx) antennas is proposed. The imaging radar is composed of dielectric aspheric lens and inline Tx/Rx antennas located both in the axis of lens. As Tx/Rx antennas, antipodal Fermi antenna is employed. Basic characteristics of the proposed imaging radar including the effect of offset of Tx/Rx antennas...
We have developed an antipodal linearly tapered slot antenna (LTSA) with corrugation for a 94-GHz band passive millimeter-wave (PMMW) imaging system. We propose a compact microstrip-slot transition for the antenna interface. Transmission loss of the transition is about 1.7 dB @94 GHz. We also present a design procedure for a circular radiation pattern for the antipodal LTSA which is well suited to...
A compact wideband millimeter wave detection element for the 35 GHz band has been developed mainly for passive imaging technologies. Applications of this element include security areas as well as food industry areas. Human bodies can be detected through fire flame, the thermal radiation emitted from fruit changes as it is ripening. Timber with knots and/or damages by white ants, and food temperature...
Design method of broadband FERMI antenna having high gain, low side lobe level and almost the same E-plane and H-plane patterns is presented. Experimental results of passive millimeter-wave imaging through fire using FERMI antenna is also described. A method of broadband active imaging using squared detector is proposed, in which autocorrelation pulse response is employed to realize a low cost imaging...
The broadband FDTD analysis of the Fermi antenna as a receiving element of passive millimeter-wave imaging is presented. The Fermi antenna is a type of the tapered slot antennas (TSA) and has a taper profile expressed by Fermi-Dirac function as well as a corrugation on the side of the substrate. A design of Fermi antenna with the axially symmetric radiation pattern was already reported in our previous...
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