Abstract: The invention relates to a directional coupler comprising coupled lines, and a method for achieving coupling in a directional coupler under compensation conditions. The directional coupler comprises coupled lines (8, 9), including a first line (8) and a second line (9), and at least one ground plane (10, 11, 13). At least one of the ground planes is a tuning ground plane (10, 11, 13), and a distance (14, 25), between the first(8) and the second (9) line, and each distance (15, 17, 26, 27), between the first line (8) and the respective tuning ground plane (10, 11, 13), are adapted so as to contribute to a desired coupling level under compensation conditions.

Abstract: The invention relates to a directional coupler comprising coupled lines, and a method for achieving coupling in a directional coupler under compensation conditions. The directional coupler comprises coupled lines (8, 9), including a first line (8) and a second line (9), and at least one ground plane (10, 11, 13). At least one of the ground planes is a tuning ground plane (10, 11, 13), and a distance (14, 25), between the first (8) and the second (9) line, and each distance (15, 17, 26, 27), between the first line (8) and the respective tuning ground plane (10, 11, 13), are adapted so as to contribute to a desired coupling level under compensation conditions.

Abstract: A directional coupler for radio frequency application, comprising: an input (110) for receiving a radio frequency input signal; a port (120) for delivering a radio frequency output signal; a first elongated conductor (150; 150:1), suspended in air between two ground planes, for connecting the input (110) with the port (120); the first conductor (150) comprising a sandwich structure with a first upper conductive strip (150A), a first intermediate layer comprising a dielectric material and a first lower conductive strip (150B); a second elongated conductor (200; 200:1), suspended in air between two ground planes, the second elongated conductor (200:1) comprising a sandwich structure with a second upper conductive strip (200:1A), a second intermediate layer comprising a dielectric material and a second lower conductive strip (200:1B); said first elongated conductor (150; 150:1) and said second elongated conductor (200; 200:1) being substantially parallel; said first upper and lower conductive strips and said sec

Abstract: A directional coupler for radio frequency application, comprising: an input (110) for receiving a radio frequency input signal; a port (120) for delivering a radio frequency output signal; a first elongated conductor (150; 150:1), suspended in air between two ground planes, for connecting the input (110) with the port (120); the first conductor (150) comprising a sandwich structure with a first upper conductive strip (150A), a first intermediate layer comprising a dielectric material and a first lower conductive strip (150B); a second elongated conductor (200; 200:1), suspended in air between two ground planes, the second elongated conductor (200:1) comprising a sandwich structure with a second upper conductive strip (200:1A), a second intermediate layer comprising a dielectric material and a second lower conductive strip (200:1B); said first elongated conductor (150; 150:1) and said second elongated conductor (200; 200:1) being substantially parallel; said first upper and lower conductive strips and said sec