Integrated Filter Antennas for Wireless Transceivers : WestminsterResearch

Title	Integrated Filter Antennas for Wireless Transceivers
Type	PhD thesis
Authors	Ahmad, W.
Abstract	This thesis presents the research carried out on the integration of filters and antennas for wireless transceivers. Filters and antennas are parts of wireless transceivers of all wireless communication systems. Filters and antennas, albeit connected, are separate circuits which take up their own individual space in wireless transceivers. Moreover, since they are individual circuits, the cost to manufacture them is also separate. Hence, to effectively combine them together in the form of a single component has a number of advantages. The overall size of the wireless transceivers with such a single component will reduce. There will be a decrease in the manufacturing cost as well. In addition, the single component will use a single feed network and may also utilise a common ground plane. The research is driven by the goal of achieving a successful and efficient integration of filters and antennas for wireless transceivers of various wireless communication systems. The research further aims to show that the integration of filters and antennas can address issues pertaining to broadband and narrowband antennas and achieve their solutions. These include the integration of bandstop filters with ultra-wideband bandpass filters and within broadband antennas in order to reject some specific interfering frequency bands and the integration of bandpass filters with narrowband antennas in order to suppress frequency harmonics and noise. In order to achieve the goal of the research, a methodical approach was adopted. Initially, individual components were designed and electromagnetically simulated. These included bandstop and bandpass filters and broadband and narrowband antennas. After that, bandstop filters were integrated with broadband antennas — forming “broadband filtennas” — and bandpass filters were integrated with narrowband antennas — forming “narrowband filtennas”. Furthermore, the ability to switch off or switch on the bandstop filters in broadband filtennas was incorporated by making the broadband filtennas reconfigurable using standard PIN diodes and novel Graphene based switches. Both sets of filtennas were designed, electromagnetically simulated and their prototypes fabricated. The prototypes were fabricated using the conventional printed circuit board technology and the newly emerging inkjet-printing technology. Hence, both rigid and flexible filtennas were constructed. The fabricated prototypes were then measured. The simulated and the measured results include S-parameters, current density, distribution of surface currents, radiation patterns, gain and efficiency. Satisfactory and desired results have been obtained for all the developed filtennas; with a reasonable agreement between the simulated and the measured results. With such results, it can be concluded that the research presented in this thesis reached the intended target and made a significant contribution to knowledge.
Keywords	antennas
	filtennas
	integrated filter antennas
	filters
	broadband
	broadband antennas
	broadband filtennas
	narrowband
	narrowband antennas
	narrowband filtennas
	uwb
	uwb filters
	uwb antennas
	uwb filtennas
	reconfigurable
	switchable
	switches
	graphene
	inkjet
	inkjet-printing
	inkjet printing
	inkjet-printed
	inkjet printed
	bandpass
	bandstop
	MIMO
	MIMO antennas
	MIMO filtennas
	wireless transceivers
	waqas ahmad
Year	2017
File	Ahmad_Waqas_thesis.pdf
Publisher	University of Westminster
Digital Object Identifier (DOI)	https://doi.org/10.34737/q3z26

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Design of Monopole Antennas for UWB Applications
Ahmad, W., Tarczynski, A. and Budimir, D. 2017. Design of Monopole Antennas for UWB Applications. 2017 IEEE AP-S Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS2017). San Diego, California, USA 09 - 14 Jul 2017 IEEE . https://doi.org/10.1109/APUSNCURSINRSM.2017.8073204

UWB Filtennas with Dual Bandnotch for WiMAX and WLAN Bands using Circular and Square Resonators
Ahmad, W. and Budimir, D. 2016. UWB Filtennas with Dual Bandnotch for WiMAX and WLAN Bands using Circular and Square Resonators. IET Active and Passive RF Devices Conference 2016. London, UK 17 - 17 Feb 2016 Institution of Engineering and Technology (IET). https://doi.org/10.1049/ic.2016.0004

Compact UWB MIMO Filtennas with Dual Bandnotch, High Isolation and High Diversity
Ahmad, W., Tasic, M. and Budimir, D. 2016. Compact UWB MIMO Filtennas with Dual Bandnotch, High Isolation and High Diversity. IEEE Asia-Pacific Microwave Conference 2016 (APMC2016). New Delhi, India 05 - 09 Dec 2016 IEEE . https://doi.org/10.1109/APMC.2016.7931444

Inkjet-Printed Antennas for 28 GHz 5G Applications
Ahmad, W. and Budimir, D. 2016. Inkjet-Printed Antennas for 28 GHz 5G Applications. IEEE Asia-Pacific Microwave Conference 2016 (APMC2016). New Delhi, India 05 - 09 Dec 2016 IEEE . https://doi.org/10.1109/APMC.2016.7931475

Switchable Filtennas with Sharp Dual Bandnotch using Looped Resonators
Ahmad, W. and Budimir, D. 2016. Switchable Filtennas with Sharp Dual Bandnotch using Looped Resonators. 46th European Microwave Conference (EuMC2016). ExCel, London, UK 04 - 06 Oct 2016 IEEE . https://doi.org/10.1109/EuMC.2016.7824375

Compact Inkjet-Printed Broadband Filtennas with Triple Bandnotch
Ahmad, W. and Budimir, D. 2016. Compact Inkjet-Printed Broadband Filtennas with Triple Bandnotch. 46th European Microwave Conference (EuMC2016). ExCel, London, UK 04 - 06 Oct 2016 IEEE . https://doi.org/10.1109/EuMC.2016.7824282

Highly Linear Reconfigurable UWB Filters with Independently Controlled Dual Bandnotch
Ahmad, W. and Budimir, D. 2016. Highly Linear Reconfigurable UWB Filters with Independently Controlled Dual Bandnotch. Microwave and Optical Technology Letters. 58 (11), p. 2639–2643. https://doi.org/10.1002/mop.30113

Inkjet-Printed Filtennas with Triple Bandnotch
Ahmad, W., Budimir, D. and Zlebic, C. 2016. Inkjet-Printed Filtennas with Triple Bandnotch. 2016 IEEE International Symposium on Antennas and Propagation and USNC-URSI Nnational Radio Science Meeting (APS2016). Fajardo, Puerto Rico 26 Jun - 01 Jul 2016 IEEE . https://doi.org/10.1109/APS.2016.7696121

Reconfigurable UWB Filtennas with Dual Bandnotch for Unwanted Bands using Graphene based Switches
Ahmad, W. and Budimir, D. 2016. Reconfigurable UWB Filtennas with Dual Bandnotch for Unwanted Bands using Graphene based Switches. 2016 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS2016). Puerto Rico, USA 26 Jun - 01 Jul 2016 IEEE . https://doi.org/10.1109/APS.2016.7696768

Dual-band Filtenna Array for WLAN Applications
Ahmad, W. and Budimir, D. 2016. Dual-band Filtenna Array for WLAN Applications. Microwave and Optical Technology Letters. 58 (2), pp. 477-481. https://doi.org/10.1002/mop.29597

Inkjet Printed Bandpass Filters and Filtennas using Silver Nanoparticle Ink on Flexible Substrate
Ahmad, W. 2014. Inkjet Printed Bandpass Filters and Filtennas using Silver Nanoparticle Ink on Flexible Substrate .

Reconfigurable UWB Filtennas with Sharp WLAN Dual Bandnotch
Ahmad, W. and Budimir, D. 2015. Reconfigurable UWB Filtennas with Sharp WLAN Dual Bandnotch. 45th European Microwave Conference (EuMC2015). Paris, France 07 - 10 Sep 2015 IEEE . https://doi.org/10.1109/EuMC.2015.7345991

Inkjet Printed Bandpass Filters and Filtennas using Silver Nanoparticle Ink on Flexible Substrate
Ahmad, W., Budimir, D., Maric, A. and Ivanisevic, N. 2015. Inkjet Printed Bandpass Filters and Filtennas using Silver Nanoparticle Ink on Flexible Substrate. AP-S International Symposium on Antennas and Propagation (APS2015). Vancouver, British Columbia, Canada 19 - 24 Jul 2015 IEEE . https://doi.org/10.1109/APS.2015.7304458

Dual-band WLAN Antenna Array with Integrated Bandpass Filters for Harmonic Suppression
Ahmad, W. and Budimir, D. 2015. Dual-band WLAN Antenna Array with Integrated Bandpass Filters for Harmonic Suppression. AP-S International Symposium on Antennas and Propagation (APS2015). Vancouver, British Columbia, Canada 19 - 24 Jul 2015 IEEE . https://doi.org/10.1109/APS.2015.7304696

Reconfigurable WLAN Notch for UWB Filters
Ahmad, W. and Budimir, D. 2014. Reconfigurable WLAN Notch for UWB Filters. 44th European Microwave Conference (EuMC2014). Rome, Italy 06 - 09 Oct 2014 IEEE . https://doi.org/10.1109/EuMC.2014.6986742

Dual-band WLAN Antenna Array with Integrated Filters for Harmonic Suppression
Ahmad, W. and Budimir, D. 2014. Dual-band WLAN Antenna Array with Integrated Filters for Harmonic Suppression. IET Active and Passive RF Devices Conference 2014. Birmingham, UK 29 - 29 Oct 2014 Institution of Engineering and Technology (IET). https://doi.org/10.1049/ic.2014.0181

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Integrated Filter Antennas for Wireless Transceivers

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