4. Communications: radio wave antennas
  5. Antennas
  6. Spiral or helical type

Francis R. Trumble

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Antenna

Communications: radio wave antennas – Antennas – Spiral or helical type
Patent

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Discharge tube arrangement

Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Induction-type discharge device load
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Helical antenna array with resonant cavity and impedance matchin

Communications: radio wave antennas – Antennas – With coupling network or impedance in the leadin
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Profile ID: LFUS-PAI-P-117782

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