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    Chip Resistor and Negative Capacitor Loaded Rectangular Broad Band Microstrip Antennas
    (Beykent Üniversitesi, 2007) Kaya, Adnan
    Various communication systems require single radiating element operating in wide band. In this paper, a novel active integrated single microstrip antenna is proposed and its radiation pattern and gain performance is optimized with analysis. The reactive loading is provided by a negative capacitor section embedded within the patch. The active negative capacitor is made of a field-effect transistor that exhibits negative resistance as well as capacitance. It can, therefore, compensate the loss of an inductor. A microstrip patch operating at 10.5 GHz having 12.2% bandwidth has been utilized as a reference antenna. With the proposed antenna design, the antenna radiation pattern can be as large as about 1.5 times that of an antenna without reactive loading. In addition, it has been shown that active compensation significantly improves the matching level.
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    Diodes Loaded Active Microstrip Antennas Design and Analysis of Diodes Effects on Active Antennas For Rf Wireless Receiver-Transmitter Systems
    (Beykent Üniversitesi, 2011) Karazeybek, Ender; Kaya, Adnan
    This paper is presentation of designed different diodes loaded active model dissimilar geometries of micro strip patch antennas. As known, mikrostrip patch antennas have complex impedance and its impedance changes with frequency. Because of this, imaginer part of micro strip patch antennas is minimized by effect of diodes having capacitive reactance thus maximum power radiating is occurred. The aim of this project is to present different diodes loaded patch antenna for ISM 2.4 Ghz and to indicate active antenna performance according to influence of locations and dc biasing of diodes then to compare the antenna parameters of passive models. Besides, this project is used three types of diodes which are schottky Barrier diodes, silicon variable capacitance diode and tuner diode and four diodes whose are bas70, bas83, bb619 and bb721. The simulation programmer is AWR Design Environment Microwave Office 2007 (MWO) whose analysis meted is moment (Mom). Finally, the antennas that are projected are ready condition for LAN application or wireless RF receiver-transmitter systems. Return loss of designed antennas are between -25.54 dB and -36.17 dB. Gain does not change a lot but results of VSWR and Input impedance is satisfactory when comparing the passive model's results.
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    Slot-Loaded Microstrip Antenna Design Of Transceiver For Wireless Data Communication In Ism Band
    (Beykent Üniversitesi, 2008) Ardic, Suna Beyza; Kaya, Adnan; Coskun, Ozlem
    This paper is a presentation of the designed procedure of the microstrip antenna operating at 2.4 GHz transceiver for RF front-end for ISM band digital wireless communication. The aim of this project is to present several types of compact microstrip patch antennas for ISM 2.4 GHz band, and then to compare and interpret the results. Besides, some information was provided as to the ISM band and transceiver systems. The different geometries of microstrip antennas are simulated such as recessed microstrip line feed, microstrip patch arrays, slot-loaded microstrip patch arrays, dual band and slot-loaded rectangular microstrip patch with AWR Microwave Office Software, using Moment Method. A slot-loaded rectangular microstrip antenna with meandering slots in the ground plane was designed; then this antenna was simulated and studied in detail. Furthermore, the effect of the results is studied by changing the parameters of the meandered antenna. The results also show that the return loss levels of the meandered antennas vary from -12.8 dB to -18.9 dB. The designed antenna operates at 2.4 GHz with 105 MHz bandwidth, having 1 of -12.8 dB at resonant frequency.