Directional coupler for the high-frequency range
First Claim
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1. A directional coupler for the high-frequency range, comprising, in combination:
- a through path and a coupling path, each extending between respective ports, and with the through and coupling paths each being symmetrically configured as sections of flat conductors in integrated waveguide technology;
at least three coupling points for coupling waves, which are conducted in the flat conductors, between the through and coupling paths are present in each path in the direction of propagation of an incident TEM mode fed to one port of the through path;
each flat conductor section in each path disposed between two adjacent of the coupling points has an electrical length equal to λ
/4, where λ
indicates the wavelength of the wave conducted in the flat conductors; and
,a respective coupling capacitor is connected between associated respective coupling points of the through and coupling paths.
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Abstract
A directional coupler that can be produced entirely in integrated technology (MIC or MMIC), particularly for the X-band. The directional coupler can be designed for a high coupling attenuation (>30 dB) and a high directivity (>30 dB) with a large relative bandwidth (approximately 20%). This is achieved with a stepped arrangement comprising a plurality of λ/4 waveguide sections and coupling capacitors disposed between the respective paths of the coupler.
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Citations
9 Claims
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1. A directional coupler for the high-frequency range, comprising, in combination:
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a through path and a coupling path, each extending between respective ports, and with the through and coupling paths each being symmetrically configured as sections of flat conductors in integrated waveguide technology; at least three coupling points for coupling waves, which are conducted in the flat conductors, between the through and coupling paths are present in each path in the direction of propagation of an incident TEM mode fed to one port of the through path; each flat conductor section in each path disposed between two adjacent of the coupling points has an electrical length equal to λ
/4, where λ
indicates the wavelength of the wave conducted in the flat conductors; and
,a respective coupling capacitor is connected between associated respective coupling points of the through and coupling paths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification