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    Time variant antenna for transmitting wideband signals
    1.
    发明授权
    Time variant antenna for transmitting wideband signals 有权

    公开(公告)号：US10135650B2

    公开(公告)日：2018-11-20

    申请号：US15038394

    申请日：2014-11-20

    Applicant: Virginia Tech Intellectual Properties, Inc.

    Inventor： Majid Manteghi ,  Mohsen Salehi

    IPC: H04B1/18 ,  H04L27/12 ,  H04B1/04 ,  H01Q3/44 ,  H01Q5/00 ,  H01Q9/04 ,  H01Q5/25 ,  H01Q3/34 ,  H04B1/00

    Abstract: A circuit for tuning a resonance frequency of an electrically small antenna. The circuit includes a first source configured for providing a modulation signal, a second source configured for providing a periodic electrical signal, an antenna, and a tuning circuit configured for modulating a resonance frequency of the antenna in response to the modulation signal. The tuning circuit includes first and second capacitors that are alternately coupled to the antenna to change the resonance frequency of the antenna. The capacitor currently coupled to the antenna is decoupled from the antenna and the other capacitor is coupled to the antenna when the voltage across the capacitor currently coupled to the antenna is momentarily zero. In an exemplary embodiment, the tuning circuit comprises first and second inductors rather than capacitors. The inductors are switched into and out of the circuit when the current through the currently coupled inductor is momentarily zero.

    Transmitter for transmitting a high-rate data transmission through direct excitation
    4.
    发明授权
    Transmitter for transmitting a high-rate data transmission through direct excitation 有权

    公开(公告)号：US10218540B2

    公开(公告)日：2019-02-26

    申请号：US15106159

    申请日：2014-12-18

    Applicant: Virginia Tech Intellectual Properties, Inc.

    Inventor： Mohsen Salehi ,  Majid Manteghi

    IPC: H04B1/04 ,  H03M11/00 ,  H04L13/00 ,  H01Q9/04 ,  H04L15/04 ,  H04B1/38

    Abstract: One aspect is a circuit for tuning a resonance frequency of an electrically small antenna and directly exciting the electrically small antenna. The circuit includes a first source configured for providing a constant voltage. The circuit also includes an antenna and a switched capacitor configured for being alternatively alternately coupled to the first source to be charged thereby and to the antenna for exciting the antenna. Another aspect is a transmitter for transmitting a wireless signal using an antenna without using a variable voltage source to excite the antenna. The transmitter includes a first source configured for providing a constant voltage. The transmitter further includes an antenna and a switched capacitor configured for being alternately coupled to the first source to be charged thereby and to the antenna for exciting the antenna and for tuning a resonance frequency of the antenna.

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