Patents by Inventor Der Fen Chu

Der Fen Chu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6208843
    Abstract: A radio frequency and microwave module for simultaneously transmitting data and audio signal comprises a transmitting unit and a receiving unit. The transmitting unit has two pre-amplifier circuit two voltage-controlled oscillators (VCO), a phase-locked loop (PLL), two low pass filters (LPF) , two amplifiers, a power combiner, a ceramic filter and a transmitting antenna. The receiving unit has a receiving antenna, a ceramic filter, a first low noise amplifier (LNA), a first mixer, an amplifier, a third VCO, a PLL, a low-pass filter, a channel filter, an IF amplifier, a phase shifter, a second mixer, a second low noise amplifier (LNA), a filtering circuit and an operational amplifier. The inventive module can be used for simultaneously transmitting data and audio signal, and the frequency response of the high frequency and low frequency component of the audio signal can be adjusted.
    Type: Grant
    Filed: June 3, 1999
    Date of Patent: March 27, 2001
    Assignee: Cirocomm Technology Corp.
    Inventors: Yu-Liang Huang, Te-Yi Chu, Der Fen Chu