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This paper presents the performance of a first pass design W-band low noise amplifier MMIC, based on coplanar waveguide (CPW) technology, and utilising 100-nm gate-length GaAs pseudomorphic power HEMTs. With a chip size of less than 1.4 mm2, this two-stage LNA achieves an average small signal gain of 12 dB between 80 and 100 GHz. The measured noise figure averages 5 dB up to 94 GHz. To the author...
A Software-Defined Radio (SDR) mobile handset must cover multiple frequency bands with different frequency division duplex distances. This calls for an adaptive duplexer, which needs a low-isolation device to create an initial isolation. Such a device is implemented in a 130nm Silicon-on-Insulator (SOI) process. Its performance benefits from a high-Q laminated PCB inductor which has a measured inductance...
This paper presents an adaptive duplexer using cancelling instead of filtering to obtain sufficient transmitter (Tx) leakage and noise isolation in the receiver. A low level pseudo-noise (PN) pilot signal is introduced in order to adjust the cancelling coefficients. To modulate the pilot signal to radio frequencies a straightforward direct up-conversion mixer with low carrier feedthrough has been...
This paper presents an active 65-nm CMOS 38 GHz differential power divider which is used for power split and signal distribution from a PLL to sub-harmonic mixers of transmitter and receiver of a 77 GHz automotive radar system. The proposed divider consists of a differential passive transformer-based power splitter and three-stage common source power amplifiers. The measurement results show a 7 dB...
This paper presents a feasibility analysis of microwave photonic links for signal distribution in active aperture radar. Phased array radar antenna uses large number of transmit/receive modules spread over the entire physical area of antenna. The received echo signal is processed with the help of various microwave and data signals. This requires distribution of large number of coaxial cables across...
A 30 to 40 GHz receiver fabricated in SiGe is presented. The receiver contains an LO-tripler-amplifier, balanced mixer and LNA. Measured data is presented for the complete receiver and for the LO tripler-amplifier subcircuit. Comparisons are made with simulation. The receiver has measured mid-band conversion gain of 18 dB, IIP3 of −10 dBm and IIP5 of −14 dBm.
The well-known Time Domain Tuning has the disadvantage that the tuning direction of the resonance is uncertain. This paper presents a new method of using the phase of the filter return loss to determine the tuning direction.
The contributions of gate-connected and source-connected field plates to extracted device capacitances (gate-source, gate-drain and drain-source capacitance) are assessed during the development of an AlGaN/GaN-on-SiC HEMT model. The capacitances due to the presence of a gate field plate are observed to be intrinsic in nature, while those associated with a source-connected field plate can be regarded...
This paper investigates a scalable likelihood detection techniques for chipless RFID tag reading. Detection error rate (DER) of a 4-bit multi-resonator chipless tag reading is performed using proposed detection algorithm. The computation complexity of the proposed detection method is significantly less compared to the other reported maximum likelihood (ML) detection techniques hence it is a feasible...
In this paper we describe the development of a novel X-band weather radar system that is fully polarimetric on a pulse by pulse basis and can be configured to operate at four different frequencies with two independent channels. The radar can be easily modified to operate at other frequency bands.
A microwave head imaging prototype to detect intracranial hemorrhage is presented. The prototype system comprises of a compact ultra-wideband (UWB) antenna, custom-made transceiver and an image processing unit. The system is experimentally tested on a realistic three-dimensional (3D) printed human head phantom. A confocal image processing algorithm based on delay and sum approach is used to rapidly...
A low-cost, portable and reconfigurable Software Defined Radar (SDRadar) based is proposed for medical imaging. The proposed system can replace the commercial VNA, which is currently used in experimental microwave imaging systems. The proposed SDRadar has the capability to produce synthetic stepped-frequency continuous wave, frequency modulated continuous waveforms (FMCW) and pseudo random noise waveforms...
Work currently being undertaken to design the receiver systems for the Square Kilometre Array Survey instrument (SKA1_survey) are described. Factors that affect the design choices are discussed and the current status of the project is outlined.
This paper reports design and test results of a wideband low-complexity RF transceiver for full duplex multi-gigabit communication systems operating in 71–76 and 81–86 GHz frequency bands based on high-performance integrated multi-chip frequency conversion modules that use commercial GaAs MMICs.
Diffraction of electromagnetic wave by a conductive strip on a dielectric slab is studied through Kobayashi potential technique. The strip is designed to maximize the cross-component of the backscattered signal hence the conductive strip performs as an EM-polarizer. This characteristic is been utilized at the radio frequency identification (RFID) system to propose a chipless tag structure with enhanced...
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