This paper presents an experimental setup of a microwave induced thermoelastic imaging system for medical applications. This system shows unique features that permit noninvasive imaging of biological tissue characteristics which are not sensed by other techniques. Experimenta 1 work is reported that demonstrates how the structure of irradiated inhomogeneous media can be identified by detection of

ABSTRACT. A computer-controlled scanning system and triaxial probes were used to measure spatial distribution of the electric full-scale hcmogeneous model of the human body. Experimental at frequencies 160 MHz, 350 MHz and 915 MHz in the near-field of dipoles and slots with reflectors are presented. electric field field in a results obtained resonant 

The paper deals with the three-dimensional reconstruction of inhomogeneous objects from scattered wave-fields. The theoretical basis is the scalar Helmholtz-equation and the corresponding Lippmann-Schwinger integral equation from which an algorithm is derived including multiple scattering to all orders. By comparison with the Born approximation the importance of higher order scattering contributio

A 30 GHz monolithic low noise balanced mixer has been developed using an integrated "bow tie" antenna/WG transition and low parasitic Mott diodes. The diodes and mixer circuit were developed on General Electric grown MBE material and were fabricated using a plated air bridge technology. Measurements on the diode at DC and RF showed that the zero bias junction capacitance was 0.025 pF and the serie

A BROADBAND HYBRID ACTIVE SWITCHABLE COMBINER D. LEVY, A. NOBLET, M. HOUDART* ABSTRACT A hybrid active switchable combiner featuring exceptional integration characteristics and easely transferable to MMIC technology has been developed properties isolation in the 1 to 7 GHz band. This component presents very attractive for front panel receivers such as : 16 dB typical gain, 40 dB and intrinsic s

A simple frequency doubler circuit is presented, which is based on the bridge rectifier scheme with a quad of Schottky diodes and a new planar balun configuration joining a microstrip and a coplanar line. Measurement results of the frequency doubler for the output frequency in the Ku-band prove the practical usefulness of this low-cost and small-sized circuit. It is characterized by a high and ne

Some experimental results obtained for high-order frequency multipliers using MESFET' s are presented. The active device considered is a GaAs Dual-Gate MESFET with submicrometer gate length. The frequency range of the output signal is from 1 up to 21 GHz, for an input frequency between .1 and 1 GHz. As a typical result, a higher multiplication factor value up to 200 has been obtained and a maximum

A novel broadband multistage single sideband detector is presented that employs a digital phase modulation produced by cascaded binary phase shifterse The system described in this paper makes use of two or three digital phase shifters and achieves at least an image sideband suppression of 40 dB and the dynamic range may be as high as 70 dB. The phase shifters must be decoupled and should yield rep

A low-noise 45 GHz mixer with a 3 GHz IF frequency has been developed using a GaAs HEMTdevice. This is the first active mixer reported above 30 GHz and the first HEMTmixer. It achieves unity gain over a 2 GHz bandwidth and a minimum SSB noise figure of 7.1 dB, including the noise from an IF amplifier. 

A digital instantaneous frequency measuring receiver (DIFM) has been built at Ka-band with a frequency resolution of 25 MHz (9 bit) using a five discriminator binary system digitised to 11.25 degrees. Absolute frequency accuracy is dispersion limited to 100 MHz. A simplified system block diagram is shown in fig. 1. Advanced technology is used in each of the three sections to obtain a compact unit