Investigation of High-Performance Millimetre-Wave and Terahertz Beam-Shaping Devices for Next Generation Communication Systems
- Publication Type:
- Thesis
- Issue Date:
- 2020
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The shortage of global bandwidth has motivated the exploration of the underutilized millimetre-wave (mm-wave) and terahertz (THz) spectrum for future broadband communication networks. Nevertheless, one of the fundamental challenges is the huge propagation loss. To tackle this problem, antennas at the front-end of transceivers should be capable of shaping the mm-wave/THz wavefront to achieve high-directivity radiation and large spatial coverage. Meanwhile, the print circuit board (PCB) cannot fully satisfy the demand due to the deterioration of electrical performance at high frequencies. Therefore, new fabrication technologies need to be exploited to build highly-efficient and highly-integrated mm-wave/THz beam shaping devices. In this thesis, taking advantage of PCB, 3-D printing, and low-temperature co-fire ceramics (LTCC), beam shaping devices including lenses, reflectarrays, antennas operating in the mm-wave and low THz region are proposed for next-generation communication systems applications. The main contents are as follows:
𝟭. 𝟯-𝗗 𝗽𝗿𝗶𝗻𝘁𝗲𝗱 𝗽𝗼𝗹𝗮𝗿𝗶𝘇𝗮𝘁𝗶𝗼𝗻 𝗺𝗮𝗻𝗶𝗽𝘂𝗹𝗮𝘁𝗶𝗼𝗻 𝗮𝗻𝗱 𝗯𝗲𝗮𝗺-𝘀𝗵𝗮𝗽𝗶𝗻𝗴 𝗱𝗲𝘃𝗶𝗰𝗲𝘀. First, we present a new 3-D printed lens, which achieves linear to circular polarization conversion and beam collimation in transmission mode simultaneously with a planar configuration. Next, we demonstrate a 3-D printed THz Fresnel-Rochon prism, which has the potential to replace conventional expensive prism. Finally, a new all-dielectric broadband dual-band reflectarray operating in K-band and V-band is demonstrated using low-cost 3-D printing. To the best of our knowledge, this is the first type of all dielectric reflectarray that has ever been reported.
𝟮. 𝗛𝗶𝗴𝗵𝗹𝘆-𝗶𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗲𝗱 𝗮𝗻𝗱 𝗵𝗶𝗴𝗵 𝗴𝗮𝗶𝗻 𝗟𝗧𝗖𝗖 𝗮𝗻𝘁𝗲𝗻𝗻𝗮 𝗮𝗿𝗿𝗮𝘆 𝗳𝗼𝗿 𝟲𝟬-𝗚𝗛𝘇 𝗮𝗻𝘁𝗲𝗻𝗻𝗮-𝗶𝗻-𝗽𝗮𝗰𝗸𝗮𝗴𝗲 𝗮𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀. Firstly, single-ended-fed planar aperture antennas fabricated using LTCC technology are demonstrated, which not only inherits the merits of the aperture antennas but also exhibits advantages of low-profile and compact size. Then, we demonstrate a low-profile wideband and high gain patch antenna array. The antenna achieves good radiation performances, which are comparable to those of the differential-driven patch antenna without a differential feeding network.
𝟯. 𝗗𝘂𝗮𝗹-𝗯𝗮𝗻𝗱 𝗯𝗲𝗮𝗺-𝘀𝗵𝗮𝗽𝗶𝗻𝗴 𝗮𝗻𝘁𝗲𝗻𝗻𝗮𝘀. First, a new kind of dual-band high gain antenna is proposed by folding a reflectarray into a Fabry-Perot cavity. The high gains of the two bands are achieved by exploiting the collimating reflectarray and Fabry-Perot resonant principles, respectively. Next, an aperture-shared dual-band antenna is proposed by integrating a high-band Fabry-Perot cavity antenna into a low-band patch antenna. Because of the FP resonance, the antenna can achieve a peak gain of 16 dBi at 28 GHz band without a feeding network.
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