Browsing by Author "Maricar, M."
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Item Metadata only An AlGaAs/GaAs-Based Planar Gunn Diode Oscillator with a Fundamental Frequency Operation of 120 GHZ(Wiley, 2014-07) Maricar, M.; Glover, James; Khalid, A.; Li, Chong; Evans, Gwynne; Cumming, D.; Oxley, C. H.Item Metadata only Design and Characterisation of a Novel Diamond Resonator(Wiley, 2014) Maricar, M.; Glover, James; Evans, G.; Khalid, A.; Cumming, D.; Oxley, C. H.Item Open Access DSP Control of Smart Antennas(IEEE, 2014) Maricar, M.; Bahar, A.; Raju, Y.; Glover, James; Nama, K.; Cross, R. B. M.Modern beam steered antennas where pattern is shaped according to optimum criteria. Smart antennas are the practical realization of adaptive array signal processing. Smart antennas can be applied to mobile wireless communication, WLAN, Wi-Max, MANET, MIMO systems; satellite communication etc. In mobile wireless communication smart antenna can provide higher system capacity by directing narrow beams towards users of interest. Smart antennas mitigate the effects multi-path fading. Smart antennas pattern are controlled via adaptive algorithms based upon maximizing signal to interference ratio, minimizing mean square Error (MSE), steering towards signal of interest, nulling interference. A smart antenna consists of an array of antenna elements (Dipole, Microstrip etc) and uses Digital Signal Processing (DSP) for phase shifting of the signal feed to individual elements of the array. In this paper, we are going to design a DSP control smart antennas array with digital beam forming techniques. Multiple Resonant is achieved by changing the structure of normal patch antenna. These antennas will be suitable for mobile and wireless LAN communicationItem Metadata only Experimentally estimated dead space for GaAs and InP based planar Gunn diodes(IOP Publishing, 2014-12) Maricar, M.; Khalid, A.; Dunn, G.; Cumming, D.; Oxley, C. H.Item Metadata only Extraction of second harmonic from an InP based planar Gunn diode using diamond resonator for milli-metric wave frequencies(Elsevier, 2016-01) Maricar, M.; Khalid, A.; Cumming, D. R. S.; Oxley, C. H.Planar Indium Gallium Arsenide (In0.57Ga0.47As) Gunn diode was fabricated on a semi-insulating indium phosphide substrate with on chip matching circuit to enable the extraction of second harmonic in millimeter and terahertz frequencies. The In0.57Ga0.47As planar Gunn diodes were designed with an active length of 4 lm, channel width of 120 lm and integrated with a novel diamond resonator to suppress the fundamental and extract the second harmonic. The experimental results gave good fundamental suppression and extraction of second harmonic (121.68 GHz) with an RF output power of 14.1 dBm.Item Metadata only Extraction of second harmonic from the In0.57Ga0.47As planar Gunn diode using radial stub resonators(Elsevier, 2014) Maricar, M.; Khalid, A.; Glover, James; Evans, Gwynne; Vasileious, P.; Li, Chong; Cumming, D.; Oxley, C. H.Item Metadata only Novel Infra-Red (IR) Thermal Measurements on GaAs Micro-coolers(2012-11) Glover, James; Hopper, R.; Maricar, M.; Khalid, A.; Cumming, D.; Montes, Miguel; Kuball, M.; Dunn, G.; Stephen, A.; Oxley, C. H.Item Metadata only Second harmonic extraction of planar Gunn diode by using resonators for milli-metric applications(ARMMS, 2014-11-17) Maricar, M.; Khalid, A.; Cumming, D. R. S.; Oxley, C. H.