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  1. jimvandamme

    Need for what type antennas?

    OK, you want a challenge? We need a transmitting antenna for a long-range ground penetrating radar. Needs to be a reasonable match to 50 ohms, gain of -10dB (yes negative, including losses!), 3MHz to 30 MHz, and "easy" to move. The antenna to beat is a bowtie thrown on the ground. Remember, the...
  2. jimvandamme

    impedance transformer for a UWB antenna

    You want easy & high bandwidth? Can't beat a bowtie.
  3. jimvandamme

    Help needed to design ~1Ghz high power Oscillator.

    A few years ago I bought a 500 watt average power solid state S band power amplifier. It cost $800,000, was 30% efficient, and weighs 120 pounds. I sat it next to our microwave oven which put out 600 watts average, 40% efficient, and cost $90. (I also developed tube transmitters.) Of course the...

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