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    Blade antenna design for UHF applications
    (IEEE, 2018) Belen, Aysu; Partal, Hakan Pasa; Ördek, Sezgin; Belen, Mehmet Ali
    The importance of today's wireless communication systems are ever increasing due to the high demand. With the development and common usage of the next generation wireless communication devices the need of high rate data transfer is increased. Herein design and measurement of a low cost high gain blade antenna for 600-3000 MHz UHF band is studied. In order to achieve a wide band high gain radiation characteristic a wide band range impedance matching over the operation band is done. The proposed design allows usage of a single antenna model over the wide operation frequency band instead of multi antenna models. Thus, with this model it is possible to reduce both the size of communication system and its cost. In this proposed blade antenna design, by creating gaps on the antennas surface a wide range impedance matching is achieved due to the change of surface current distribution. As it can be observed from the measurement results the proposed antenna's return loss characteristic is less than -6db, and has a gain characteristic of 4.5-6.2 dB over the operation band.
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    Design and implementation of doppler microwave motion sensor for indoor application
    (Yıldız Teknik Üniversitesi, 2018) Belen, Mehmet Ali; Mahouti, Peyman; Güneş, Filiz; Partal, Hakan Pasa
    This paper presents a systematic integration and circuits design scheme of ISM-band Doppler radar for shortrange applications. The authors designed a complete CW Doppler radar transceiver and made a test for verification. Firstly, we establish a system model by conventional radar equation. Secondly, design the schematics of main modules including an oscillator, a mixer, and antennas. Finally, perform system integration using the designed circuits diagrams and parameters. The performance is found fairly satisfactory by test verification
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    Design and realization of an ultra-low power sensing RF energy harvesting module with its RF and DC sub-components
    (Wiley, 2019) Partal, Hakan Pasa; Belen, Mehmet Ali; Partal, Sibel Zorlu
    Herein, design, development, and analysis of ultra-low power sensing energy harvesting modules and their subcomponents for ISM band applications have been studied with a holistic approach in an effort to achieve a feasible and high efficient RF energy harvesting performance. The complete harvester system designed and developed here consists of a zero-bias RF energy rectifying antenna (rectenna), DC boost converters and energy storage super-capacitors. Compared with the counterpart energy sources, the surrounding or transmitted wireless energy has low intensity which requires designs with high efficiency. To achieve a successful harvester performance, rectifier circuits with high sensitivity Schottky diodes and proper impedance matching circuits are designed. Dedicated RF signals at various levels from nanowatts to miliwatts are applied at the input of the rectenna and the measured input power versus the scavenged DC output voltage are tabulated. Furthermore, by connecting the rectifier to a high gain antenna and using a RF signal transmitter, the wireless RF power harvesting performance at 2.4 GHz was tested up to 5 m. The performance of the rectenna is analyzed for both low-power detection and efficiencies. Impedance matching network is implemented to reduce the reflected input RF power, DC to DC converters are evaluated for their compatibility to the rectifiers, and super-capacitor behaviors are investigated for their charging and storage capabilities. The measured results indicate that a wide operating power range with an ultra-low power sensing and conversion performance have been achieved by optimizing the efficiency of the Schottky rectifier as low as -50dBm. The system can be used for battery free applications or expanding battery life for ultra-low power electronics, such as; RFID, LoRa, Bluetooth, ZigBee, and low power remote sensor systems.