الفهرس | Only 14 pages are availabe for public view |
Abstract This thesis addresses design of antennas and microwave circuits in gap waveguide Technology. The main advantages of the ridge gap waveguides compared to hollow waveguides are that they are planar and much cheaper to manufacture, in particular at high frequencies such as for millimeter and submillimeter waves. The radiation characteristics of a wideband magneto-electric (ME) antennas are studied. The antenna introduces wideband impedance matching from 26 GHz to 40 GHz with circular polarization bandwidth. A wideband ME-antenna is optimized by using substrate integrated waveguide (SIW) technology for using in printed circuit board (PCB). The single SIW ME-dipole is designed and a 2 × 2 ME-dipole subarray is constructed to increase the circular polarization (CP) bandwidth to 80 % and peak gain of 8.3 dBi. Different array configurations have been investigated. The radiation characteristics of dielectric resonator antenna (DRA) array using the ridgegap waveguide technology (RGW) for millimeter wave applications at 60 GHz are investigated. The array element consists of rectangular DRA mounted on ground plane with coupling slot. The signal is excited through a single rectangular slot in RGW cavity. Different array arrangements are investigated for gain and bandwidth improvement. Each array geometry has compact size of 23.04×22.27×5.88 mm3 for 60 GHz applications. 1×3 linear array, two crossed 1×3 arrays, and 3×3 array arrangements are investigated. These arrangements have a single excitation slot and a number of coupling slots equals to the DRA elements. A peak gain of 11.3 dBi, 12.9 dBi, and 16 dBi are achieved for different array arrangements. The proposed structures are full-wave simulated using the finite integral technique (FIT). |