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Directional coupler

A directional coupler and coupling line technology, which is applied to waveguide-type devices, high-frequency matchers, circuit devices, etc., can solve the problems of reducing the overall length and the length of the coupling line cannot be further reduced, and achieve the effect of shortening the length.

Inactive Publication Date: 2009-12-09
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the design of directional couplers for microstrip lines in recent years, one of them is to use quarter-wavelength parallel coupled lines (such as figure 1 The two parallel coupled lines 10) shown in the figure are used to synthesize the required amount of coupling and reduce the overall length, but such a design still prevents the length of the coupled lines from being further reduced

Method used

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Examples

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Embodiment Construction

[0014] figure 1 A coupling line of the conventional directional coupler on the PCB shown is rectangular, and its material is conductive metal (such as copper), and its length is 180 mils.

[0015] Please refer to figure 2 ,will figure 1 The two ends of the coupling line 10 are respectively retracted by the same distance to the middle position to form a coupling line 20 with a length of 150 mils. The two ends of the coupling line 20 are connected with two capacitors C1 and C2 to shorten The subsequent coupling line 20 may be equivalent to the coupling line 10. Wherein, the capacitance values ​​of the two capacitors C1 and C2 are equal.

[0016] Please refer to Figure 3 to Figure 5 The coupling line 20 can be divided into two coupling lines 22 and 24 along its axis of symmetry. The capacitors C1 and C2 are respectively connected to one end of the two coupling lines 22 and 24 far away from each other. At this time, according to the principle of structural symmetry, The two capaci...

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Abstract

The invention discloses a directional coupler comprising two coupling lines; wherein, the coupling lines respectively extend out from the centre positions of the two coupling lines to form a sector structure, and the central angle of the sector structure is smaller than 90 degrees. The directional coupler of the invention can shorten the length of the coupling lines.

Description

Technical field [0001] The invention relates to a directional coupler. Background technique [0002] In many high-frequency transmitting devices, a directional coupler is often inserted in the path from the final power amplifier to the transmitting antenna to measure the transmitting power of the transmitting device or measuring the reflected power of the antenna. The directional coupler is composed of transmission lines. Coaxial lines, rectangular waveguides, circular waveguides, strip lines and microstrip lines can all constitute directional couplers. The microstrip line directional coupler has a simple manufacturing process and can have the goal of planarization. It does not require any external components such as capacitors and inductors in the design, so the cost is low. In the design of microstrip line directional couplers in recent years, one of them is the use of quarter-wavelength parallel coupling lines (such as figure 1 Two parallel coupling lines 10) are shown to syn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P5/18H04B1/04
CPCH01P5/184H05K1/0237
Inventor 郑光伟陈欣屏
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD