AM Transmitter

Discussion in 'Wireless & RF Design' started by gmcwilliams, Mar 9, 2007.

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  1. gmcwilliams

    Thread Starter Member

    Dec 12, 2006
    Hi all,

    I am attempting to build an AM transmitter. I have the oscillator working very nicely and I am getting a nice smooth signal the problem I am having is with my antenna. With an AC signal on a very small, when compared to wavelength, antenna I get a transmission that goes in every direction. I have two questions:

    a.) Is it possible to direct the signal into an arc or beam type pattern besides dipole arrays with reflectors and directors?

    b.) What would be a good material to prevent the transmission of the signal in directions that I don't want to go in without disrupting the signal itself. I have tried connecting ground plates near the antenna and that just causes massive power loss.

    I would like to be able to transmit in 180 degrees of a sphere but prevent it in the other 180. Any suggestions would be welcome.

  2. Dave

    Retired Moderator

    Nov 17, 2003
    Duplicate thread.
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