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- The Ministry of Information-Communication assigned 18~19GHz frequency band for communication of cabins and platform to link between subway/train and it's station. In this paper, we propose wireless transmission devices which are 2 stage hybrid low noise amplifier of 18GHz band and mixer for 18GHz as well to apply for RF receiver. We designed LNA to be noise matched its 1st stage and gain matched for 2nd stage and mixer using 180° hybrid coupler to suppress the spurious signal. The transistors of 18 GHz LNA and mixer are NE3210S01 of NEC and KMB-N51-1, respectively. As the result of simulation, we get 19.92dB gain and 2.06dB noise figure with LNA and 8.61dB conversion loss with mixer.Key Words : Low noise amplifier, 18GHz, Noise matching, Gain matching, Diode mixer, Coupler*    :   **   :   †,  :   E-mail : kimcaf2@cau.ac.kr  : 2011 10 22  : 2011 11 25 1.              .                 .  ,                          .                 .          ,        ,               ,     .                 . 2.4GHz  WLAN               (100m )        .         18.86~19.92GHz  19.20~19.26GHz   ‘     ( )  ’  [1].   WLAN                      .  /          RF    18GHz       .  RF         18GHz          2    . ,   10GHz                . 3dB         180°    .              . ,         .

Design of LNA and Mixer for Ku-band Receiver