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. / European Union Horizon 2020 Research and Innovation Programme (Marie Skłodowska-Curie Actions) under grant agreement H2020-MSCA-ITN-2016 SECRET-722424.
| Identifer | oai:union.ndltd.org:BRADFORD/oai:bradscholars.brad.ac.uk:10454/19065 |
| Date | January 2020 |
| Creators | Al-Yasir, Yasir I.A. |
| Contributors | Abd-Alhameed, Raed, Noras, James M. |
| Publisher | University of Bradford, Faculty of Engineering and Informatics |
| Source Sets | Bradford Scholars |
| Language | English |
| Detected Language | English |
| Type | Thesis, doctoral, PhD |
| Rights | <a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/3.0/"><img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by-nc-nd/3.0/88x31.png" /></a><br />The University of Bradford theses are licenced under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/3.0/">Creative Commons Licence</a>. |
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