الفهرس | Only 14 pages are availabe for public view |
Abstract Millimeter wave (Mm-Wave) communication systems have attracted significant interest regarding meeting the capacity requirements of the future 5G network. The Mm-Wave systems have frequency ranges in between 30 and 300 GHz. Although the available bandwidth of Mm-Wave frequencies is promising, the propagation characteristics are significantly different from microwave frequency bands in terms of path loss, diffraction and blockage, rain attenuation, atmospheric absorption, and foliage loss behaviors. In general, the overall loss of Mm-Wave systems is significantly larger than that of microwave systems for a point-to-point link. Fortunately, however, the small wavelengths of Mm-Wave frequencies enable large numbers of antenna elements to be deployed in the same form factor thereby providing high gains. The main objective for the thesis is designing four antennas operating at the Mm-Wave range. This thesis is organized as follow: Simulation and fabrication the four prototypes: The first two model are log periodic dipole array antennas (LPDA), one of which cover a frequency range between 26 GHz to 44 GHz implemented on RT5880 as a dielectric medium and a thickness of 0.508 mm utilized for 5G applications, and the second prototype is also LPDA antenna which has a super wide range between 40 GHz and 70 GHz fabricated on RT5880 as a dielectric medium and a thickness of 0.254 mm utilized for V-band applications like, wireless personal area network (WPAN) supported by IEEE 802.11ad and IEEE 802.15.3c. The two models have little dimensions, stable radiation characteristics, high realized gain, side lobe suppressions. The third model is an antipodal Vivaldi antenna (AVA), which is designed and implemented on FR-4 substrate with a dielectric thickness of 1.5mm which includes a wide range from 58GHz to 62 GHz. Moreover, the antenna accomplishes high gain, a stable radiation pattern and a miniaturized size to be convenient for short-range communications and millimeter wave imaging. The fourth prototype is a coplanar waveguide antenna (CPW) which simulated on a lossy metallic silver glass substrate with a conductivity of 4.41084 + e07 s/m and a metal thickness of 1.1 mm. This antenna operates at a bandwidth extend from 50 GHz to 70 GHz and is utilized for WiGig applications known as Wi-Fi 60 GHz. Finally, The simulated and fabricated results are agree well and achieved better results compared to the literature work. |