Outputs (9)

10 GHz Low Loss Liquid Metal SIW Phase Shifter for Phased Array Antennas (2023)
Journal Article
Alkaraki, S., Lin, Q. W., Borja, A. L., Wang, Z., Wong, H., Tang, S., Wang, Y., & Kelly, J. R. (2023). 10 GHz Low Loss Liquid Metal SIW Phase Shifter for Phased Array Antennas. IEEE Transactions on Microwave Theory and Techniques, 71(11), 5045 -5059. https://doi.org/10.1109/TMTT.2023.3308160

This article presents a proof of concept demonstrator for a pair of novel phase shifters based on substrate integrated waveguide (SIW) technology. Gallium-based liquid metal (LM) is used to reconfigure each phase shifter. This article presents LM pha... Read More about 10 GHz Low Loss Liquid Metal SIW Phase Shifter for Phased Array Antennas.

Circuits and Antennas Incorporating Gallium-Based Liquid Metal (2023)
Journal Article
Wu, Y.-W., Alkaraki, S., Tang, S.-Y., Wang, Y., & Kelly, J. R. (2023). Circuits and Antennas Incorporating Gallium-Based Liquid Metal. Proceedings of the IEEE, 111(8), 955-977. https://doi.org/10.1109/JPROC.2023.3285400

This article reviews the application and technology advancement of gallium (Ga)-based liquid metal (LM) in high-frequency circuits and antennas. It discusses the material properties of common LMs, the fluidic channels used to contain LM and their man... Read More about Circuits and Antennas Incorporating Gallium-Based Liquid Metal.

Continuous Beam Steering Realized by Tunable Ground in a Patch Antenna (2023)
Journal Article
Qu, Z., Zhou, Y., Alkaraki, S., Kelly, J. R., & Gao, Y. (2023). Continuous Beam Steering Realized by Tunable Ground in a Patch Antenna. IEEE Access, 11, 4095-4104. https://doi.org/10.1109/ACCESS.2023.3235597

A continuously steerable patch antenna employing liquid metal is presented. The proposed antenna employs a novel tunable ground plane together with parasitic steering to steer the direction of the main beam. The tunable ground plane consists of a per... Read More about Continuous Beam Steering Realized by Tunable Ground in a Patch Antenna.

A Reconfigurable Microstrip Patch Antenna With Switchable Liquid-Metal Ground Plane (2022)
Journal Article
Qu, Z., Kelly, J. R., Wang, Z., Alkaraki, S., & Gao, Y. (2023). A Reconfigurable Microstrip Patch Antenna With Switchable Liquid-Metal Ground Plane. IEEE Antennas and Wireless Propagation Letters, 22(5), 1045-1049. https://doi.org/10.1109/LAWP.2022.3231872

This letter presents a novel reconfigurable microstrip patch antenna that is reconfigured using liquid metal. The proposed antenna employs two approaches in unison to switch the direction of the main beam. Specifically, the antenna uses the parasitic... Read More about A Reconfigurable Microstrip Patch Antenna With Switchable Liquid-Metal Ground Plane.

A Wideband Circularly Polarized Antenna Based on Anisotropic Metamaterial (2022)
Journal Article
Lin, Q.-W., Alkaraki, S., Wong, H., & Kelly, J. R. (2023). A Wideband Circularly Polarized Antenna Based on Anisotropic Metamaterial. IEEE Transactions on Antennas and Propagation, 71(2), 1254-1262. https://doi.org/10.1109/tap.2022.3225157

This article presents a novel circularly polarized (CP) antenna based on an anisotropic metamaterial. The antenna is capable of performing linear-to-circular polarization conversion over a wideband of frequencies in the X-band (8-12 GHz). The propose... Read More about A Wideband Circularly Polarized Antenna Based on Anisotropic Metamaterial.

Techniques for Designing High Gain and Two‐Dimensional Beam Scanning Antennas for 5 G (2022)
Book Chapter
Mittra, R., Nasri, A., Arya, R. K., Chaudhary, P., Ketty, J. R., ALkaraki, S., & Borja, A. L. (2022). Techniques for Designing High Gain and Two‐Dimensional Beam Scanning Antennas for 5 G. In Y. Jay Guo, & R. W. Ziolkowski (Eds.), Antenna and Array Technologies for Future Wireless Ecosystems (43-82). Wiley-IEEE Press. https://doi.org/10.1002/9781119813910.ch2

This chapter presents a number of novel concepts for designing antenna arrays, which achieve high gain levels together with wide-angle scan capability. It begins with the Luneburg lens antenna, which supports beam scanning over a very wide angular ra... Read More about Techniques for Designing High Gain and Two‐Dimensional Beam Scanning Antennas for 5 G.

Gallium-Based Liquid Metal Substrate Integrated Waveguide Switches (2020)
Journal Article
Alkaraki, S., Kelly, J., Borja, A. L., Mittra, R., & Wang, Y. (2021). Gallium-Based Liquid Metal Substrate Integrated Waveguide Switches. IEEE Microwave and Wireless Components Letters, 31(3), 257-260. https://doi.org/10.1109/LMWC.2020.3040795

This letter presents a new approach for reconfiguring substrate integrated waveguide (SIW) devices. It involves allowing or prohibiting the wave propagation by using a removable wall which is built from a series of drill holes. When the wall is requi... Read More about Gallium-Based Liquid Metal Substrate Integrated Waveguide Switches.

3D-printed millimetre-wave antennas with spray-coated metalization (2020)
Book Chapter
Alkaraki, S., Kelly, J., & Yue Gao. (2020). 3D-printed millimetre-wave antennas with spray-coated metalization. In Q. H. Abbasi, S. Fizzah Jilani, A. Alomainy, & M. Ali Imran (Eds.), Antennas and Propagation for 5G and Beyond (67-99). Institution of Engineering and Technology (IET). https://doi.org/10.1049/pbte093e_ch4

This chapter is concerned with corrugated plate antennas. The corrugated plate antennas, presented here, consist of a resonant slot formed within a metallic plate. The resonant slot is surrounded by a rectangular cavity and corrugations. Subwavelengt... Read More about 3D-printed millimetre-wave antennas with spray-coated metalization.

High aperture efficient slot antenna surrounded by the cavity and narrow corrugations at Ka‐band and Ku‐band (2018)
Journal Article
Alkaraki, S., Gao, Y., & Parini, C. (2018). High aperture efficient slot antenna surrounded by the cavity and narrow corrugations at Ka‐band and Ku‐band. IET Microwaves, Antennas and Propagation, 12(12), 1926-1931. https://doi.org/10.1049/iet-map.2018.0060

A design criterion for a small, compact, high-aperture-efficient antenna is proposed in this study. The proposed criterion is validated experimentally through fabricating and testing two prototypes for Ku-band and Ka-band applications. The proposed a... Read More about High aperture efficient slot antenna surrounded by the cavity and narrow corrugations at Ka‐band and Ku‐band.