Theory And Technology Of The High Efficient And Compact Array Antenna

The rocketing developments of mobile communication systems, radar systems, electronic warfare systems, and microwave imaging systems are pushing the innovation of the most important part of these systems-antennas. In different applications, antenna arrays might seek different characteristics, such as high gain and low sidelobe, broad main beam, being easily integrated with other microwave and millimeter wave circuits in one system, or different polarizations, e.g. linear polarization, circular polarization or dual polarization, etc. Especially, on the moving platform with high speed, such as airplane, missile, and satellite, etc., high efficient and compact antenna arrays are much needed. Actually, radomes are needed to protect antenna arrays from bad weather or other situations in the field. Radomes are designed to improve the properties of these antennas. Based on the applications for the communication systems and synthetic aperture radar systems, and etc., some high efficient and compact arrays and the radome are expanded in this thesis.1. Based on the linear waveguide-fed microstrip patch array, a high efficient waveguide-fed microstrip patch array antenna with circular polarization in the main beam is presented. This kind of array can be applied for the communication systems. The new waveguide-fed central microstrip patch structure is studied. This central microstrip patch element is totally different from the one of the linear waveguide-fed microstrip patch array. Secondly, according to the perturbation method, other microstrip patch elements fed by microstrip line are designed. Both the new central microstrip patch elements and other microstrip patch elements show the characteristic of circular polarization. Finally, and 8 ? 8 arrays of this new structure are simulated. The results verify circular polarization characteristic of this structure.2. A high efficient and compact substrate integrated waveguide end slot antenna is proposed. This kind of antenna can provide dual frequency bands and dual polarizations in one aperture for synthetic aperture radar. A new substrate integrated waveguide coaxial transmission line is designed to feed this antenna. In the array aperture, this antenna element shows the super-thin characteristic. Compared to the traditional waveguide broadside slots array or substrate integrated waveguide broadside slots array, the arrays consisted by this compact antenna are prone to easily realize dual frequency bands and dual polarizations. The measured results verify the good properties of this antenna.3. The traditional substrate integrated waveguide slots arrays are designed based on the design principles of waveguide broadside slots arrays. The S parameters and gain of these arrays are simulated and given. Then, several arrays constructed by the substrate integrated waveguide end slot antenna are analyzed. The tested results are compared with the simulated results of the traditional substrate integrated waveguide slots arrays.4. Since the debut of the left-hand material, it quickly becomes a hot topic in the microwave and millimeter wave field. A high efficient Ku band left-hand material radome is depicted. To obtain the characteristics of the left-hand material radome, an Archimedean antenna with broad main beam and broad frequency band is set behind it. The measured results prove the left-hand material radome can narrow the beam width and raise the gain of the antenna.