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A super miniaturized transceiver module whose size is 35 mm/spl times/35 mm/spl times/6 mm has been successfully developed for LMDS (Local Multipoint Distribution System). The module, which can be directly connected to an antenna consists of all active circuits and a frequency duplexer using the newly developed drop-in circulator. An AlN multilayer LCC package was employed in consideration of transmission loss and thermal management. The saturated output power of 23 dBm, the phase noise of 91 dBc/Hz@100 kHz off, and the receiver noise figure of 7.0 dB are obtained in 30 GHz band.