Research On Short Backfire Antennas With Multi-Type Polarizations

By the development of science and technology and the modernization of society, it isrequired a higher update requirements for communications equipment. The antenna, as animportant part in it, is also faced with the touch requirements of high efficiency,miniaturization high-gain and so on. This paper is about short backfire antenna. It has theexcellent characteristics of high gain, high efficiency, compact structure and costperformance.Firstly, it is described the basic knowledge of short backfire antenna. Introducing typicalshort backfire antenna and summing its different improved structure. Secondly, research anddesign superior performance the linear polarized, dual-polarized and circularly polarizedshort backfire antenna.Thesis design includes three types of short backfire antenna. First, it is designed twokinds of linearly polarized short backfire antennas, waveguide excitation and H-shaped slotexcitation structure. Designing a SBA of simple structure with waveguide excitation, andthen exploring the role of the different parts of the antenna performance, last designing a newtype of high gain, broadband waveguide linearly polarized short backfire antenna. Devisingshort backfire antenna of H-shaped slot patch to meet the requirements of wider bandwidthand low sidelobes. Second, designing two different characteristics of orthomode transducer,simple structure and high isolation, and then combining them with waveguide short backfireantenna to achieve two kinds of dual-polarized short backfire antenna with good performance.The design results prove that they are to meet the target requirements. Finally, it is designedthat circularly polarized short backfire antenna of double H-shaped slot patch, method fromthe short backfire antenna of H-shaped slot patch linearly polarized.