Seam Radiating Antenna Of A Cavity Based On Siw Technology

The rapid development and application of modern communication technology make communication systems develop toward miniaturization, integration and high performance. Compared to other components, the antennas because of the disadvantages of low integration ability and low performance have limited the integration of complete appliance greatly. Microstrip slot antennas, because of the advantages such as low cost, light weight, low profile, relatively broad work bandwidth and ease of mass production, are widely used in microwave and millimeter-wave systems. At the same time, because of the compact configuration and the adoption of microstrip-feeding, microstrip slot antennas can integrate with other circuits in the systems. So the integration problem between antennas and other circuits has been solved. But when the antennas install at a platform, the both-directional radiation characteristic of the slot antennas will bring very grievous electromagnetic compatibility into the system. The energy radiating towards to the platform will possibly affect the performance of other circuit in the system. At the same time, the electromagnetic wave reflected back will affect the antenna's performance. So metal cavity or metal plane is usually used for suppressing the radiation of one side to get a unidirectional radiation pattern. However, the import of both metal cavity and metal plane will increase the antenna's volume greatly and destroy the compact structure of slot antennas. At that time, it is difficult to integrate the slot antennas with other circuits on one chip.For solving the above problems, we will take the cavity-backed slot antenna as the main study object in this paper. After exploring the radiation mechanism of the slot antennas, we introduced a new integratable cavity to replace the metal cavity and designed a wideband cavity-backed slot antenna based on substrate integrated waveguide (SIW) technology. The main contents are:1. researches on the radiation mechanism of slot antenna;2. researches on the transmission characteristic of the substrate integrated waveguide, the equivalence between the substrate integrated waveguide and traditional metal waveguide; 3. researches on the bandwidth increasing technology of microstrip-fed slot antenna. The work bandwidth of this antenna has increased greatly by introducing muti-resonance technology;4. researches on the design method of taking the SIW cavity to replace the traditional metal cavity for suppressing back radiation.Simulated and experimental results indicated that the designed and fabricated millimeter-wave wide-band microstip-feeding slot antenna based on SIW technology has the advantages of compact configuration, low profile (only 4% work wavelength), wide work bandwidth (absolute bandwidth of 10GHz and relative bandwidth of 30.6%) and good radiation performance. Because the whole antenna is fabricated on substrates, it can integrate with other circuit directly. The expected design goals are satisfied.