Small branch line coupler

A branch line and coupler technology, applied in the direction of waveguide devices, circuits, connecting devices, etc., can solve the problem of large integrated circuits occupying an area, meet the needs of bandwidth, and reduce the size of the circuit.

Inactive Publication Date: 2010-09-29
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional branch line coupler is not suitable for use in integrated circuits due to its large area.

Method used

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Examples

Experimental program
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Embodiment 1

[0016] Embodiment 1: With the help of the very mature microwave integrated circuit processing technology at present, a metal conductive strip is made on the printed circuit board according to the following parameters. The coupler structure is symmetrical up and down, left and right, and the first metal conductive strip is 1 long l 1 20mm, width w 1 =1mm The length of the second metal conduction strip 2 l 2 20.3mm, width w 2 =0.6mm; the length l of the third metal conduction belt 3 is 4mm, and the width w=1.54mm; the diameter d of the metal hole 4 1 =0.9mm, pitch p 1 =1.2mm, the diameter d of the metal hole 5 2 =0.6mm, pitch p 2 = 1mm, their height is h 2 =0.4mm; the heights of media 6 and 7 are h respectively 1 = 0.1 mm, h 2 =0.4mm, the relative permittivity is ε r =2.2; 8 is the grounding plate.

[0017] Table 1

[0018]

[0019] Figure 5 is the HFSS simulation result of the present invention, from Figure 5-1 It can be seen that the branch line coupler is in...

Embodiment 2

[0020] Example 2: The length of the first metal conductive strip 1 is l 1 13.2mm, width w 1 =0.24mm The length of the second metal conduction belt 2 l 2 14mm, width w 2 =0.15mm; the length l of the third metal conduction belt 3 is 2mm, and the width w=1mm; the diameter d of the metal hole 4 1 = 1mm, pitch p 1 =1.1mm, the diameter d of the metal hole 5 2 =0.8mm, pitch p 2 =0.9mm, their height is h 2 =0.45mm; the heights of media 6 and 7 are h respectively 1 =0.05mm, h 2 =0.45mm, the relative permittivity is ε r =4; 8 is the grounding plate. At this time, it can also meet the requirements in the working frequency band (1760MHz-2130MHz).

Embodiment 3

[0021] Example 3: The length of the first metal conductive strip 1 is l 1 34.6mm, width w 1 =3.95mm The length of the second metal conduction belt 2 l 2 35.2mm, width w 2 =2.46mm; the length l of the third metal conduction belt 3 is 4mm, and the width w=2.5mm; the diameter d of the metal hole 4 1 =0.3mm, pitch p 1 =2mm, the diameter d of the metal hole 5 2 =0.2mm, pitch p 2 =1.8mm, their height is h 2 =0.1mm; the heights of media 6 and 7 are h respectively 1 =0.4mm, h 2 =0.1mm, the relative permittivity is ε r =1; 8 is the grounding plate. At this time, it can also meet the requirements in the working frequency band (1760MHz-2130MHz).

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Abstract

The invention discloses a small branch line coupler, which comprises a first metal conduction band, a second metal conduction band, four ports and a ground plate. A group of upper and lower metal posts and a group of left and right metal posts are punched in a dielectric layer to form an artificial dielectric layer. The artificial dielectric layer is overlaid on the ground plate. An isolating layer is overlaid on the artificial dielectric layer. A rectangular circuit formed by the first metal conduction band and the second metal conduction band is arranged at a position above the isolating layer corresponding to the metal posts. Since the invention adopts the artificial dielectric layer and the isolating layer to substitute for common dielectric substrates in a traditional branch line coupler, the dimension of the circuit is effectively reduced, the miniaturization of the circuit is realized and the coupler can be well used in mobile communication; and since bandwidth covers 1920MHz-2170MHz, the requirement on the third generation (3G) telecommunication bandwidth is satisfied.

Description

technical field [0001] The invention is used for power distribution and coupling in 3G communication, especially a small branch line coupler. Background technique [0002] In microwave systems, the branch line coupler is a widely used microwave device. For example, directional couplers are used in vector network analyzers, power combiners, and mixers in microwave receivers. There are many forms of transmission line couplers, mainly branch line couplers and coupled line couplers. A large number of literatures on the basic principles and design techniques of such devices as branch line couplers have appeared one after another, for example: "Ultra-Wideband Microwave Direct Design of Directional Coupler" [Guangdong Communication Technology, 2008.03, author Gao Fan], "Design of Ultra-Wideband Directional Coupler" [2003 Radio Engineering Vol. The rapid development of mobile communication technology has put forward the miniaturization requirements of communication technology, and ...

Claims

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Application Information

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IPC IPC(8): H01P5/18
Inventor 唐万春陈如山丁大志林叶嵩温中会王晓科王丹阳许小卫
Owner NANJING UNIV OF SCI & TECH
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