Directional coupler

A directional coupler and substrate technology, which can be used in waveguide-type devices, circuits, connecting devices, etc., and can solve the problems of long lines and large circuits.

Active Publication Date: 2014-11-05
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the UHF band, the line length of the λ / 4 wavelength is long, and the circuit becomes large

Method used

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Embodiment Construction

[0018] Hereinafter, the directional coupler according to this embodiment will be described with reference to the drawings.

[0019] figure 1 It is a perspective view showing the structure of the directional coupler according to this embodiment, and shows an example of a directional coupler used in a high-power amplifier for a ground digital video transmitter. figure 2 (a) is figure 1 A top view of the directional coupler, figure 2 (b) is AA' sectional view. In addition, in figure 1 In , the shielding case 15 is omitted.

[0020] Main lines 11 are arranged on the front surface of dielectric substrate 10 , and sub lines 12 are formed on the back surface of dielectric substrate 10 , and sub lines 12 are arranged at a predetermined interval from main lines 11 in plan view of dielectric substrate 10 . In addition, a ground plane 13 of the sub-line 12 is formed on the surface of the dielectric substrate 10 so as to overlap the sub-line 12 . In consideration of power resistan...

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PUM

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Abstract

A directional coupler according to the present embodiment includes a dielectric substrate (10), a main line (11) formed on the front surface of the dielectric substrate (10), a sub line (12) formed on the front surface or the rear surface of the dielectric substrate (10) and placed with a predetermined gap from the main line (11) when the dielectric substrate (10) is viewed in plan, and an opening (14) penetrating the dielectric substrate (10) between the main line (11) and the sub line (12).

Description

technical field [0001] Embodiments of the present invention relate to a directional coupler used, for example, in a power amplifier for a digital video transmitter that transmits high power. Background technique [0002] Conventionally, a general structure of a directional coupler has used a microstrip line structure in which the entire rear surface of a dielectric substrate is a ground conductor and a main line and a sub line (directional coupler) are patterned on the surface. The coupling line which is a part of the sub-line is arranged on the substrate with a line pattern having an appropriate length at a slight interval from the main line. [0003] As is well known, in general, directivity is best when the length of the coupled line (the distance between the coupled port and the isolated port) is λ / 4 relative to the wavelength λ of the transmission signal detected from the main line. However, in the UHF band, the line length of the λ / 4 wavelength is long, and the circui...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01P5/18
CPCH01P5/185H01P5/184
Inventor莲池健一板垣广务
OwnerKK TOSHIBA