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Directional coupler

  • US 20040005814A1
  • Filed: 06/06/2003
  • Published: 01/08/2004
  • Est. Priority Date: 06/27/2002
  • Status: Active Grant
First Claim
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1. Directional coupler having at least one coupling line piece (23) which is coupled to a coaxial inner conductor (5) of coaxial line pieces (1) and, for this purpose, the coupling line piece (23) is provided on or adjacent to a coupler substrate (19

  • ) which is arranged on a resting or mounting section (11) of the outer conductor (3) of the coaxial line piece (1) in the region of a cutout (15) in the outer conductor (3), and the coupling line piece (23) is in this way held in the space between the inner conductor (5) and the outer conductor (3), characterized by the following further features;

    an attenuation circuit (27) is adjacent and is connected to each of the two coupling line ends (25) on the coupler substrate (19

    ), or an attenuation circuit (27) is connected to one coupling line end (25) with a terminating resistor (49) being connected to the other coupling line end (25) on the coupler substrate (19

    ), electrical level evaluation (33) is provided on the coupler substrate (19

    ), and an interface device (35) for connection of possibly unshielded cables (41) is provided on the coupler substrate (19

    ), or possibly unshielded cables (41) are connected to the level evaluation circuit device or are connected downstream from this on the coupler substrate (19

    ), via which the RF signals which are obtained via the coupling line piece (23) can be passed on in the form of analog AF signals.

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