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2 A CWG duplexer or multiplexer designed for production and a tuning method for tuning this kind of CWG filter KEYWORDS AAS (active/advanced antenna system), 5G, Massive MIMO, Base station, CWG (ceramic waveguide) Filter；AFU( antenna filter unit) BACKGROUND With the development of advance radio system, high performance, small size smart radio is required. highly integrated AAS system with multi-channels are widely in development in recently years. In those radio systems, RF filter is one important part for selecting wanted frequency and reject the unwanted frequency spurious of the system. Both metal and CWG filter are widely used in those AAS system. Metal filter provide good IL, power handling, with mature material and production process, metal solution is widely used in AAS systems. In order to produce small size low weight AAS system, many technical have be used to minimize the size and weight based on the metal filter, such as soldering lid, sheet metal, and semi-solid die casting. Mechanical process always has limitation, and the size and weight of metal filter cannot continue reduce. Compare with metal filter, t...