Nowadays, wireless communication users require various services that have a high data transmission rate, good stability, and a high level security. However, limited frequency resources, and fading effects caused by reflection, diffusion, and diffraction make this problematic. One of the methods used...
Nowadays, wireless communication users require various services that have a high data transmission rate, good stability, and a high level security. However, limited frequency resources, and fading effects caused by reflection, diffusion, and diffraction make this problematic. One of the methods used to overcome these difficulties is the use of circular polarization. In this paper, a circularly polarized dielectric resonator antenna (CP-DRA) using a cross-slot-feed was examined in order to improve the gain and axial ratio bandwidth. For many years, the dielectric resonator (DR) has primarily been used in microwave circuits, such as oscillators and filters, where the DR is normally made of a high permittivity material. The frequency range of interest for many systems has gradually increased to the micrometer and millimeter range. At these frequencies, the conductor loss of metallic antennas becomes severe and the efficiency of the antennas is reduced significantly. The only loss for a DR antenna (DRA) is due to the imperfect dielectric material, and this can be made very small in practice. Compared to the microstrip antenna, the DRA has a much wider impedance bandwidth. This is because the microstrip antenna radiates only through two narrow radiation slots, whereas the DRA radiates through the whole surface except the grounded part. Avoidance of surface waves is another attractive advantage of the DRA over the microstrip antenna. Firstly, a single layer CP-DRA was studied as a reference for comparison. Then a multilayer CP-DRA is proposed to enhance the gain and axial ratio bandwidth. Secondly, from consideration of the antenna gain enhancement, the spacing between the elements of the multilayer CP-DRA for high gain is examined through analysis of the radiation performance of a 2×2 planar array of DRAs with a spacing of 0.7 and 1.2 using CST Microwave Studio. The radiation pattern of a single element is relatively wide, and each element provides low gain. In many applications it is necessary to design antennas with very high gain to meet the demands of long distance communications. This can be accomplished by forming an array of radiating elements. We have fabricated single- and multi-layer CP-DRAs, and find that the gain and axial ratio bandwidth of the multilayer structure is approximately twice that of the single layer one. In the case of the array antenna, in which the spacing between multilayer CP-DRA elements was 1.2, a grating lobe is reduced, in contrast to what we can expect from a conventional antenna array. The gain was 13.4dBi and axial ratio bandwidth was 0.8GHz.
Nowadays, wireless communication users require various services that have a high data transmission rate, good stability, and a high level security. However, limited frequency resources, and fading effects caused by reflection, diffusion, and diffraction make this problematic. One of the methods used to overcome these difficulties is the use of circular polarization. In this paper, a circularly polarized dielectric resonator antenna (CP-DRA) using a cross-slot-feed was examined in order to improve the gain and axial ratio bandwidth. For many years, the dielectric resonator (DR) has primarily been used in microwave circuits, such as oscillators and filters, where the DR is normally made of a high permittivity material. The frequency range of interest for many systems has gradually increased to the micrometer and millimeter range. At these frequencies, the conductor loss of metallic antennas becomes severe and the efficiency of the antennas is reduced significantly. The only loss for a DR antenna (DRA) is due to the imperfect dielectric material, and this can be made very small in practice. Compared to the microstrip antenna, the DRA has a much wider impedance bandwidth. This is because the microstrip antenna radiates only through two narrow radiation slots, whereas the DRA radiates through the whole surface except the grounded part. Avoidance of surface waves is another attractive advantage of the DRA over the microstrip antenna. Firstly, a single layer CP-DRA was studied as a reference for comparison. Then a multilayer CP-DRA is proposed to enhance the gain and axial ratio bandwidth. Secondly, from consideration of the antenna gain enhancement, the spacing between the elements of the multilayer CP-DRA for high gain is examined through analysis of the radiation performance of a 2×2 planar array of DRAs with a spacing of 0.7 and 1.2 using CST Microwave Studio. The radiation pattern of a single element is relatively wide, and each element provides low gain. In many applications it is necessary to design antennas with very high gain to meet the demands of long distance communications. This can be accomplished by forming an array of radiating elements. We have fabricated single- and multi-layer CP-DRAs, and find that the gain and axial ratio bandwidth of the multilayer structure is approximately twice that of the single layer one. In the case of the array antenna, in which the spacing between multilayer CP-DRA elements was 1.2, a grating lobe is reduced, in contrast to what we can expect from a conventional antenna array. The gain was 13.4dBi and axial ratio bandwidth was 0.8GHz.
주제어
#Dielectric Resonator Antenna Multilayer DRA Circular Polarization
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