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The implement of array configuration is one of most common methods to enhance the terahertz radiation from photoconductive antennas. In this paper, in depth analyses of such array configurations are made. Guidelines for optimization are drawn.
A novel broadband Terahertz antenna design covering 100–600 GHz is developed as imaging pixel of THz focal plane array. Proposed focal plane array consist of novel cross bow tie antenna on quartz substrate behind the quartz hyper hemispherical lens. FPA performance is studied at low and high frequencies to determine the pixel pitch and number of effective pixels. Off axis performance of FPA is studied...
Terahertz photoconductive antenna arrays with interdigitated electrodes are laid down on GaAs substrates in which different geometries are assessed for their ability to enhance performance of a time-domain spectrometer (TDS) system.
A novel conjugate ESPRIT (C-ESPRIT) algorithm is proposed to estimate the direction of arrival (DOA) and direction of departure (DOD) for bistatic MIMO radar. It employs the properties of noncircular signals to construct a new virtual array first, the virtual antenna number of which is twice that of the MIMO virtual array. It then exploits the rotational invariance property of the new virtual array...
Our work has demonstrated that the Fourier decomposition method to predict mutual coupling between elements in a strongly-coupled array is effective and accurate. In principle, this method is applicable to any type of elements in a large array where the edge effects can be ignored. Further research will be conducted toward developing interpolation method of ARC over phase shift U and V to reduce the...
A Vivaldi TSA array has been designed and analysed. It can operate over 4-16GHz and be capable of scanning to 50deg. This study shows that the strong mutual coupling between elements plays a constructive role in the array performance of active impedance matching. The introduction of corrugated edge to the TSA element has no effect on the active matching but the scan gains are improved. Further research...
Small antennas have been widely investigated and reported in various medical applications for some times. It is interesting to note that small ultra wideband (UWB) antennas are also demanded for some medical applications recently. One of the medical applications which require the UWB antennas is the microwave imaging of breast cancer. This imaging modality transmits lower power short microwave pulses...
A low-complexity Kalman-filter-based channel estimation method for orthogonal frequency-division multiplexing systems is proposed. This method belongs to the pilot-symbol-aided parametric channel estimation method in which the channel responses are characterised as a collection of sparse propagation paths. Because of the slow variation of the signal subspace in the channel samples' correlation matrix,...
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