Making UWB antennas unidirectional: phase coherence with an ultra-wide band frequency selective surface reflector

Dushmantha N. Thalakotuna; Karu P. Esselle; Ladislau Matekovits; Yogesh Ranga

doi:10.1007/978-3-031-39824-7_4

Making UWB antennas unidirectional: phase coherence with an ultra-wide band frequency selective surface reflector

Dushmantha N. Thalakotuna, Karu P. Esselle^*, Ladislau Matekovits, Yogesh Ranga

^*Corresponding author for this work

School of Engineering

Research output: Chapter in Book/Report/Conference proceeding › Chapter › peer-review

Abstract

Research on ultra-wideband (UWB) systems gained significant pace in the recent past; many printed configurations of monopole and slot antennas have been demonstrated for these systems. These printed UWB antennas have an impedance bandwidth greater than 106% to cover the Federal Communication Commission (FCC) UWB band from 3.1 GHz to 10.6 GHz. One notable common feature of these antennas is their bidirectional radiation patterns, indicating significant radiation to both upper and lower hemispheres. This is a direct result of the partial ground planes common to these printed UWB antennas. When such an antenna is integrated into the top of a device, all the power radiated into the lower hemisphere will be wasted inside the device. In most cases, this loss is close to 50%. Another intrinsic drawback of such antennas consists of the impossibility to install them parallel to and closely above a conducting surface, such as a hard-disk enclosure or a circuit board, because the similar conducting surface destroys the antenna matching. This happens because a strong electric near field below these antennas exists, and it is “short-circuited” by such parallel conductors. This chapter is focused on an appropriately designed planar UWB reflector. Designing such a planar reflector with a bandwidth greater than 106% is a challenging task indeed. In narrowband systems, metallic screen reflectors are placed at a distance of λ/4 to provide in-phase reflection. Most of the research on Artificial Magnetic Conductors (AMCs) has been limited to broadband or multiband operations. Hence, in this chapter, we present the design of planar reflectors with over 110% bandwidth using two-dimensional printed periodic structures. A properly designed reflector manifests low transmission and good phase coherence over an ultra-wide frequency band. The design, analysis and experimental validation of two different configurations have been chosen to be illustrated in this chapter.

Original language	English
Title of host publication	The advancing world of applied electromagnetics
Subtitle of host publication	in honor and appreciation of Magdy Fahmy Iskander
Editors	Akhlesh Lakhtakia, Cynthia M. Furse, Tom G. Mackay
Place of Publication	Switzerland
Publisher	Springer, Springer Nature
Chapter	4
Pages	73-110
Number of pages	38
ISBN (Electronic)	9783031398247
ISBN (Print)	9783031398230
DOIs	https://doi.org/10.1007/978-3-031-39824-7_4
Publication status	Published - 2024

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10.1007/978-3-031-39824-7_4

Cite this

Thalakotuna, D. N., Esselle, K. P., Matekovits, L., & Ranga, Y. (2024). Making UWB antennas unidirectional: phase coherence with an ultra-wide band frequency selective surface reflector. In A. Lakhtakia, C. M. Furse, & T. G. Mackay (Eds.), The advancing world of applied electromagnetics: in honor and appreciation of Magdy Fahmy Iskander (pp. 73-110). Springer, Springer Nature. https://doi.org/10.1007/978-3-031-39824-7_4

Thalakotuna, Dushmantha N. ; Esselle, Karu P. ; Matekovits, Ladislau et al. / Making UWB antennas unidirectional : phase coherence with an ultra-wide band frequency selective surface reflector. The advancing world of applied electromagnetics: in honor and appreciation of Magdy Fahmy Iskander. editor / Akhlesh Lakhtakia ; Cynthia M. Furse ; Tom G. Mackay. Switzerland : Springer, Springer Nature, 2024. pp. 73-110

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abstract = "Research on ultra-wideband (UWB) systems gained significant pace in the recent past; many printed configurations of monopole and slot antennas have been demonstrated for these systems. These printed UWB antennas have an impedance bandwidth greater than 106% to cover the Federal Communication Commission (FCC) UWB band from 3.1 GHz to 10.6 GHz. One notable common feature of these antennas is their bidirectional radiation patterns, indicating significant radiation to both upper and lower hemispheres. This is a direct result of the partial ground planes common to these printed UWB antennas. When such an antenna is integrated into the top of a device, all the power radiated into the lower hemisphere will be wasted inside the device. In most cases, this loss is close to 50%. Another intrinsic drawback of such antennas consists of the impossibility to install them parallel to and closely above a conducting surface, such as a hard-disk enclosure or a circuit board, because the similar conducting surface destroys the antenna matching. This happens because a strong electric near field below these antennas exists, and it is “short-circuited” by such parallel conductors. This chapter is focused on an appropriately designed planar UWB reflector. Designing such a planar reflector with a bandwidth greater than 106% is a challenging task indeed. In narrowband systems, metallic screen reflectors are placed at a distance of λ/4 to provide in-phase reflection. Most of the research on Artificial Magnetic Conductors (AMCs) has been limited to broadband or multiband operations. Hence, in this chapter, we present the design of planar reflectors with over 110% bandwidth using two-dimensional printed periodic structures. A properly designed reflector manifests low transmission and good phase coherence over an ultra-wide frequency band. The design, analysis and experimental validation of two different configurations have been chosen to be illustrated in this chapter.",

author = "Thalakotuna, {Dushmantha N.} and Esselle, {Karu P.} and Ladislau Matekovits and Yogesh Ranga",

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Thalakotuna, DN, Esselle, KP, Matekovits, L & Ranga, Y 2024, Making UWB antennas unidirectional: phase coherence with an ultra-wide band frequency selective surface reflector. in A Lakhtakia, CM Furse & TG Mackay (eds), The advancing world of applied electromagnetics: in honor and appreciation of Magdy Fahmy Iskander. Springer, Springer Nature, Switzerland, pp. 73-110. https://doi.org/10.1007/978-3-031-39824-7_4

Making UWB antennas unidirectional: phase coherence with an ultra-wide band frequency selective surface reflector. / Thalakotuna, Dushmantha N.; Esselle, Karu P.; Matekovits, Ladislau et al.
The advancing world of applied electromagnetics: in honor and appreciation of Magdy Fahmy Iskander. ed. / Akhlesh Lakhtakia; Cynthia M. Furse; Tom G. Mackay. Switzerland: Springer, Springer Nature, 2024. p. 73-110.

Research output: Chapter in Book/Report/Conference proceeding › Chapter › peer-review

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AU - Ranga, Yogesh

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Thalakotuna DN, Esselle KP, Matekovits L, Ranga Y. Making UWB antennas unidirectional: phase coherence with an ultra-wide band frequency selective surface reflector. In Lakhtakia A, Furse CM, Mackay TG, editors, The advancing world of applied electromagnetics: in honor and appreciation of Magdy Fahmy Iskander. Switzerland: Springer, Springer Nature. 2024. p. 73-110 doi: 10.1007/978-3-031-39824-7_4

Making UWB antennas unidirectional: phase coherence with an ultra-wide band frequency selective surface reflector

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