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    Design of New, Compact and Efficient Microstrip Filters for 5G Wireless Communications. Design, Simulation, Implementation and Measurement of Efficient, Compact, Multi-standard, and Reconfigurable/Tunable Microstrip Filters and their Integration with Patch Antennas for Current and Future Wireless Communications

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    PhD Thesis (8.201Mb)
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    Publication date
    2020
    Author
    Al-Yasir, Yasir I.A.
    Supervisor
    Abd-Alhameed, Raed A.
    Noras, James M.
    Keyword
    Microwave filters
    Microstrip
    Resonators
    Reconfigurable
    Tunable
    Varactor diode
    5G wireless networks
    Antenna
    Filtenna
    Wireless communications
    Rights
    Creative Commons License
    The University of Bradford theses are licenced under a Creative Commons Licence.
    Institution
    University of Bradford
    Department
    Faculty of Engineering and Informatics
    Awarded
    2020
    
    Metadata
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    Abstract
    The electromagnetic spectrum is becoming increasingly congested due to the rapid development of wireless and mobile communication in recent decades. New, compact and efficient passband filters with multi-functions and good performance are highly demanded in current and future wireless systems. This has also driven considerable technological advances in reconfigurable/tunable filter and filtering antenna designs. In light of this scenario, the objectives of this thesis are to design, fabricate and measure efficient, compact, multi-standard, and reconfigurable/tunable microstrip resonator filters and study the integration of the resonators with patch antennas. As a passive design, a compact dual-band filter is implemented to cover 2.5 to 2.6 GHz and 3.4 to 3.7 GHz for 4G and 5G, respectively. Another design is also presented with the advantages of a wide passband of more than 1 GHz. Conversely, new and compact reconfigurable filters are designed using varactor and PIN diodes for 4G and 5G. The proposed filters are tunable in the range from 2.5 to 3.8 GHz. The bandwidth is adjustable between 40 and 140 MHz with return losses between 17 to 30 dB and insertion loss of around 1 dB. Also, the thesis investigates the design of cascaded and differentially-fed filtering antenna structures. The cascaded designs operate at 2.4 and 6.5 GHz and have a relatively wide-band bandwidth of more than 1.2 GHz and a fractional bandwidth of more than 40%. For the differentially-fed structures, good performance is achieved at the 3.5 GHz with a high realized gain of more than 7.5 dBi is observed.
    URI
    http://hdl.handle.net/10454/19065
    Type
    Thesis
    Qualification name
    PhD
    Collections
    Theses

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