| In the past few years ,the wireless technology develop rapidly ,Slot antenna are extensive researched in the wireless applications . Slot antenna is the antenna which draws the gap in coaxial transmission lines, microwave cavity or waveguide transmission line ,making the electromagnetic radiation from the gap to the outer space to transport. Waveguide slot antenna has some characteristics of light weight, small size, caliber, high efficiency and low side lobe, and so on. Waveguide slot antenna has a great future in the radar antenna (including the lead antenna and communication antenna) and various other aspects of communications technology. Now in the wireless environment the requirements of antenna equipment at the electromagnetic adaptation become very high. The frequency technology of a series of anti-electromagnetic interference needs a basic which needs a wide bandwidth antenna. Waveguide slot antenna is a key component in wideband radar applications .Therefore, the research Of broadband waveguide slot antenna is important .This article first describes the significance and the Application environment of the waveguide slot antenna ,also the overview of waveguide slot antenna at home and abroad and some developments at this stage. Then introduce the Babinet principle, and come out of the relevant principles of slot antennas. Focused on the gaps in the form of waveguide slot antennas, equivalent circuit and the calculation principle of normalized equivalent impedance. We introduced the theory of mutual coupling. We summed up the Elliot classic design formulas and Chebyshev aperture synthesis.According to the principle described earlier , We design and simulate the traditional longitudinal seam waveguide slot antenna which work in the Ka-band with the gap number 8 and 46 respectively, then the antenna performance is given. Considering the antenna bandwidth, we innovate the shape of the gap. Use the double-arc shape to simulate. The radiation performance of the new type of waveguide slot antenna are analysised... |
