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    Development of active integrated antennas and optimization for harmonic suppression antennas. Simulation and measurement of active antennas for amplifiers and oscillators and numerical solution on design and optimization of active patch antennas for harmonic suppression with adaptive meshing using genetic algorithms.

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    Final_2007_zhou.pdf (5.494Mb)
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    Publication date
    2007-07-10
    Author
    Zhou, Dawei
    Supervisor
    Abd-Alhameed, Raed A.
    Keyword
    Active integrated antenna
    Class F
    Active oscillator antenna
    AM Modulation
    ASK Modulation
    Sensor patch
    Harmonic suppression
    Genetic algorithms
    Rights
    Creative Commons License
    The University of Bradford theses are licenced under a Creative Commons Licence.
    Institution
    University of Bradford
    Department
    School of Engineering Design and Technology
    Awarded
    2007
    
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    Abstract
    The objectives of this research work are to investigate, design and implement active integrated antennas comprising active devices connected directly to the patch radiators, for various applications in high efficiency RF front-ends, integrated oscillator antennas, design and optimization of harmonic suppression antennas using a genetic algorithm (GA). A computer-aided design approach to obtain a class F operation to optimizing the optimal fundamental load impedance and designing the input matching circuits for an active integrated antenna of the transmitting type is proposed and a case study of a design for 1.6 GHz is used to confirm the design principle. A study of active integrated oscillator antennas with a series feed back using a pseudomorphic high electronmobility transistor (PHEMT) confirms the design procedure in simulation and measurement for the oscillator circuit connected directly to the active antenna. Subsequently, another design of active oscillator antenna using bipolar junction transistor (BJT) improves the phase noise of the oscillation and in addition to achieve amplitude shift keying (ASK) and amplitude modulation (AM) modulation using the proposed design circuit. Moreover, the possibility of using a sensor patch technique to find the power accepted by the antenna at harmonic frequencies is studied. A novel numerical solution, for designing and optimizing active patch antennas for harmonic suppression using GA in collaboration with numerical electromagnetic computation (NEC), is presented. A new FORTRAN program is developed and used for adaptively meshing any planar antenna structure in terms of wire grid surface structures. The program is subsequently implemented in harmonic suppression antenna design and optimization using GA. The simulation and measurement results for several surface structures show a good agreement.
    URI
    http://hdl.handle.net/10454/4763
    Type
    Thesis
    Qualification name
    PhD
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      Explanation of DC/RF Loci for Active Patch Antennas.

      Ali, N. T.; Hussaini, Abubakar Sadiq; Abd-Alhameed, Raed A.; Child, Mark; Rodriguez, Jonathan (Springer, 06/09/2010)
      A characteristic loop locus of dc power versus RF output power was observed as the frequency was varied around the optimum point of an operational active antenna. A new technique was introduced into the simulation, plotting the dependence of parameters such as supply current, efficiency or output power on internal impedance as seen by the naked transistor. It is now clear that the loop was formed as a consequence of the interaction of the transistor packaging elements with the patch impedances
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