But the wavelength in 330MHz～370MHz has reached 857mm, and use single-layer capacitors to reduce the size still can not carry out a very small filter, which is bound to affect the overall structure of the system. The filter will increase manufacturing costs. Take double-layer capacitor design in a bold attempt to reduce the length of inner conductor, through the HFSS simulation, have been relatively satisfied. After repeated experiments, the final design reaches 166mm*60mm*32mm a small volume of low-frequency filter. The usage of filters is also very good.In this paper, we analyze a variety of communication signals which are generated in the space of spurious interference, intermodulation interference and congestion interference, in order to estimate, or the way these signals are combined by way of equipment needed to provide the isolation requirements. In response to these requests, the designed combiner targets to ensure the combined signal to normal after the road work. Additionally, based on the use of scenarios of POI, the author calculates the insertion loss of the equipment, and Power Handling, and other indicators of third-order intermodulation applications.
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