CN104934702A

CN104934702A - Substrate integrated waveguide (SIW) dual-circular polarized antenna of composite right-/left-handed transmission line

Info

Publication number: CN104934702A
Application number: CN201510365054.2A
Authority: CN
Inventors: 蔡本晓; 孙玲玲; 文进才
Original assignee: Hangzhou Dianzi University
Current assignee: Hangzhou Dianzi University
Priority date: 2015-06-25
Filing date: 2015-06-25
Publication date: 2015-09-23

Abstract

The invention discloses a substrate integrated waveguide (SIW) dual-circular polarized antenna of a composite right-/left-handed transmission line. The SIW dual-circular polarized antenna comprises a medium substrate, wherein metal patches are coated on the upper surface and the lower surface of the medium substrate, the medium substrate is formed by integrating a rectangle and an isosceles right triangle, the beveled edge of the isosceles right triangle is overlapped with the short edge of the rectangle, metalized through holes having same radius at equal intervals are formed on the medium substrate along a central line on the length direction of two long edges of the rectangle and two right-angle edges of the triangle, the metalized through holes penetrate through the metal patches at the upper layer and the lower layer, and a gap is formed on the metal patch at the upper layer of the medium substrate. By the SIW dual-circular polarized antenna, the defects that wave velocity radiated by an upper waveguide and a lower waveguide is split and the antenna gain is reduced because the phase velocity between the upper waveguide and the lower waveguide of the traditional antenna is more than zero are overcome. Through the structure, the phase velocity between the upper waveguide and the lower waveguide at a working frequency range can be ensured to be zero, so that the gain of the antenna having an U-shaped structure can be increased.

Description

A kind of left-right-hand composite transmission line SIW dual circularly polarized antenna

Technical field

The invention belongs to a kind of antenna, be specifically related to a kind of left-right-hand composite transmission line SIW dual circularly polarized antenna.

Background technology

Substrate integrated waveguide technology overcome conventional waveguide cannot with the shortcoming of integrated circuit slitless connection.Inherit the advantage that conventional waveguide gain is high, power capacity is large, electromagnetic leakage is low compared with micro-band simultaneously.Instead of traditional radiating guide at microwave especially millimeter wave field, become a very important antenna branch.Circular polarized antenna has the advantage overcoming multipath fading simultaneously, is widely used.Circular polarization is divided into left-hand circular polarization and right-handed circular polarization two kinds of modes.Possess antenna that is left-handed, dextrorotation two kinds of circular polarization simultaneously, improve the antijamming capability of antenna.The SIW double-circle polarization slot antenna of existing U-shaped structural design, has the advantage of compact conformation.But the defect existed is that the velocity of wave direction of the upper and lower waveguide of U structure is identical with phase velocity direction, causes the velocity of wave direction of the velocity of wave direction of Waveguide slot radiation and lower Waveguide slot radiation to there is angle, thus causes entire gain lower.

Summary of the invention

The present invention is directed to the deficiencies in the prior art, propose a kind of left-right-hand composite transmission line SIW dual circularly polarized antenna.

A kind of left-right-hand composite transmission line SIW of the present invention dual circularly polarized antenna, the dielectric substrate being scribbled metal patch by upper and lower surface is formed, the rectangle that described dielectric substrate is formed in one and isosceles right triangle are formed, and the hypotenuse of isosceles right triangle overlaps with rectangle minor face.

Dielectric substrate is along the center line on rectangular two long limits, length direction and leg-of-mutton two right-angle sides, have the plated-through hole equidistantly waiting radius, plated-through hole runs through upper and lower double layer of metal paster, the radius of plated-through hole is 1/50 of wavelength, and the distance between adjacent metal through hole is 1/10 of wavelength; The upper strata metal patch of dielectric substrate has gap, and described seam shape is for can produce left-handed capacitors and circular polarization radiation.

Described gap is the size of the effective wavelength in waveguide along the spacing on rectangle length direction.

Beneficial effect: the phase velocity that instant invention overcomes waveguide and lower waveguide on traditional antenna is greater than zero, causes the velocity of wave bifurcated of upper and lower waveguide antenna, reduces the gain of antenna.This structure can ensure that waveguide and lower waveguide are zero in the phase velocity of working frequency range, thus the gain of U-shaped structural antenna is improved.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention.

Embodiment

As shown in Figure 1, a kind of left-right-hand composite transmission line SIW dual circularly polarized antenna, the dielectric substrate 1 being scribbled metal patch by upper and lower surface is formed, and the rectangle that described dielectric substrate 1 is formed in one and isosceles right triangle are formed, and the hypotenuse of isosceles right triangle overlaps with rectangle minor face.

Dielectric substrate 1 is along the center line on rectangular two long limits, length direction and leg-of-mutton two right-angle sides, have the plated-through hole 2 equidistantly waiting radius, plated-through hole 2 runs through upper and lower double layer of metal paster, the radius of plated-through hole is 1/50 of wavelength, and the distance between adjacent metal through hole is 1/10 of wavelength; The upper strata metal patch of dielectric substrate has gap 3, and described seam shape is for can produce left-handed capacitors and circular polarization radiation.

Described seam shape is for can produce left-handed capacitors and circular polarization radiation.

Upper side through hole in rectangle and intermediate throughholes form first wave guide, lower side through hole in rectangle and intermediate throughholes form the second waveguide, two side through hole of isosceles right triangle form waveguide turning structure, play the function be connected with the electromagnetic wave of the second waveguide first wave guide.Gap radiation polarization mode is circular polarization.

This structural antenna has two kinds of polarization modes.When electromagnetic wave inputs from first wave guide, polarization mode is left-hand circular polarization.Electromagnetic wave is incorporated into the second waveguide from first wave guide by waveguide turning structure.First wave guide, the second waveguide radiation simultaneously left-hand circular polarization.Because the first groove part gap is right-hand man's compound (CRLH), can guarantee that the main beam direction of first, second waveguide overlaps, realize the maximization of antenna gain.In like manner, when electromagnetic wave is from the second waveguide input, polarization mode is right-handed circular polarization.

Claims

1. a left-right-hand composite transmission line SIW dual circularly polarized antenna, the dielectric substrate being scribbled metal patch by upper and lower surface is formed, it is characterized in that: the rectangle that described dielectric substrate is formed in one and isosceles right triangle are formed, and the hypotenuse of isosceles right triangle overlaps with rectangle minor face; Dielectric substrate is along the center line on rectangular two long limits, length direction and leg-of-mutton two right-angle sides, have the plated-through hole equidistantly waiting radius, plated-through hole runs through upper and lower double layer of metal paster, the upper strata metal patch of dielectric substrate has gap, and described seam shape is for can produce left-handed capacitors and circular polarization radiation; Described gap is the size of the effective wavelength in waveguide along the spacing on rectangle length direction.

2. a kind of left-right-hand composite transmission line SIW dual circularly polarized antenna according to claim 1, is characterized in that: the radius of described plated-through hole is 1/50 of wavelength.

3. a kind of left-right-hand composite transmission line SIW dual circularly polarized antenna according to claim 1, is characterized in that: the distance between described adjacent metal through hole is 1/10 of wavelength.