| 摘要 |
There is disclosed an integrated diplexer-amplifier for near antenna installation apparatus that routes amplified microwave signals in two different directions at the same time from RF input signals derived from two different sources. The apparatus makes use of four microwave bandpass filters arranged in a dual diplexer configuration and the amplifiers are connected such that RF signal gain in both directions is achieved, thereby eliminating the undesired losses associated with a coaxial cable such as that connected between a transceiving station and antenna. The apparatus is designed to be mounted on an antenna support, or a structure near to the antenna, in order to make up the RF signal loss of coaxial cable connections. Preferably the apparatus incorporates combline bandpass filters which pass essential fundamental signals only, providing high isolation between transmit and receive signals, while providing a grounded, connection to unwanted signals and DC current, thereby enhancing protection against lightning caused voltage damage. The apparatus permits the use of low cost, high loss, coaxial cable for connecting a transceiver system to an antenna.
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