The major characteristic of this platform is that it contains all the frequency bands of public communication.The author analyses the application environment and function of the POI, and get a set of data which should be necessary to the system. In chapter 4, according to the chi hair straightener data, the author designs the POI, and then introduces the requests, design method and implement method of the components about the POI deeply.The traditional POI cannot contain all bands, because there are so many types of public communication in China, and the cheap polo shirts distance between different communication frequency is very close. In this situation, the isolation becomes the design's bottleneck.This POI use up-Link, down-Link separation system's design which not only ralph lauren polo shirts achieve the isolation by dimensional loss, but also narrow the comparative band, broad the protect band, so the design of combiner in the POI is much easier, and the combiner in the POI becomes more Lacoste Polo Shirts cheap. Uplink signal & downlink signal transmit in differ tracks, and IMD3 of the combiner is avoided. Therefore a variety of signal systems can take use of POI access to the same set of Lacoste Polo Shirts indoor distribution system. This makes the costs of indoor coverage in large-scale construction much lower.The330MHz～370MHz filter in the POI uses an innovative double-decker capacitor to shorten the inside conductor. Make use of single-layer capacitors in a manner to reduce the height of the conductor is a very common practice on the passive filter design.
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