CN103715477A - Microwave frequency band three-frequency-point polarization-independent 90-degree polarized revolver and application thereof - Google Patents

Abstract

The invention discloses a microwave frequency band tri-frequency polarization-independent 90-degree polarization rotator and its application. The lower metal structure is composed of four electric field coupling resonant structures with the same shape arranged in 90-degree rotational symmetry; the electric field coupling resonant structure of the upper metal structure and the corresponding electric field coupling resonant structure of the lower metal structure are relatively twisted by 45 degrees. The present invention adopts a chiral metamaterial structure with 90-degree rotational symmetry characteristics, does not require multi-layer media and different patch structures, and has a simple structure. At the same time, the present invention adopts an electric field coupling resonance structure, which can make the 90-degree polarization rotator work at The three frequency points in the microwave frequency band greatly increase the practicability of the involved devices.

Description

A microwave-band triple-frequency polarization-independent 90-degree polarization rotator and its application

Technical field:

The invention belongs to the field of microwave technology, in particular to a 90-degree polarization rotator.

Background technique:

The 90-degree polarization rotator has the characteristic of rotating the azimuth angle of the incoming linearly polarized radio wave by 90 degrees, and can be applied in remote sensing, wireless communication and other systems. Traditional 90-degree polarization rotators in the microwave band include the U-shaped structure proposed by Chen Huang and the metal wire structure proposed by Yuqian Ye. The former is to etch U-shaped metal resonant structures of different sizes on the surface of the medium to realize a dual-frequency 90-degree polarization rotator, but it can only act on linearly polarized waves at a specific polarization angle; the latter etches rectangular metal on the surface of the medium The wire structure, by arranging the metal wires in a 90-degree rotationally symmetrical structure, makes it respond to linearly polarized waves of different polarization angles, but this structure can only work at a single frequency point and cannot meet the needs of multi-band systems.

Invention content:

The object of the present invention is to provide a microwave-band triple-frequency polarization-independent 90-degree polarization rotator and its application to solve the above technical problems; the microwave-frequency triple-frequency polarization-independent 90-degree polarization rotator has excellent performance and can be used in The microwave frequency band operates at three frequency points and is insensitive to the polarization angle of the incident ray polarized wave.

In order to achieve the above object, the present invention adopts the following technical solutions:

A microwave-band triple-frequency polarization-independent 90-degree polarization rotator, including a dielectric substrate; an upper metal structure is provided on the upper surface of the dielectric substrate, and a lower metal structure is provided on the lower surface; the upper metal structure and the lower metal structure are both of the same shape The four electric field coupling resonant structures are arranged in 90-degree rotational symmetry; the electric field coupling resonant structure of the upper metal structure and the corresponding electric field coupling resonant structure of the lower metal structure are relatively twisted by 45 degrees.

The further improvement of the present invention is that: the electric field coupling resonant structure includes a ring and two T-shaped metal wires symmetrically arranged in the ring; the T-shaped metal wires include a first metal wire and a second metal wire connected vertically to each other; two The T-shaped metal wires are arranged symmetrically in the ring, two first metal wires are arranged at intervals, one end of the second metal wire is connected to the first metal wire, and the other end is connected to the ring.

The further improvement of the present invention is that: the thickness of the dielectric substrate is h, and the width and length are both h1; the radius of the ring is r, and the width of the ring is w1; the width of the first metal line is w2, and the length of the first metal line is is w3, the width of the second metal line is w4, and the width of the gap between the two first metal lines is g; h: h1: r: w1: w2: w3: w4: g = 3.18: 14: 3: 0.4: 1.3:3.1:0.1:0.1.

The further improvement of the present invention lies in: h=3.18mm, h1=14mm, r=3mm, w1=0.4mm, w2=1.3mm, w3=3.1mm, w4=0.1mm, g=0.1mm.

The further improvement of the present invention is that: the four electric field coupling resonant structures of the upper metal structure and the lower metal structure are arranged in a 90-degree rotationally symmetrical form, forming a chiral metamaterial that is insensitive to the polarization angle of the incoming line polarization .

The further improvement of the present invention lies in that the positions of the corresponding circular rings on the upper metal structure and the lower metal structure coincide.

The further improvement of the present invention is that: the dielectric substrate is Taconic RF-60, and its relative dielectric constant is 6.18.

The further improvement of the present invention is that: the cross-polarization transmission coefficients of the three frequency points 9.7GHz, 11.53GHz and 13.53GHz in the microwave frequency band of the microwave frequency band three-frequency polarization-independent 90-degree polarization rotator are all greater than 0.9, and the same polarity The polarization transmission coefficients are all less than 0.15, the polarization rotation angle is greater than 85 degrees, and the ellipticity is less than 1 degree.

Application of a microwave-band triple-frequency polarization-independent 90-degree polarization rotator in preparing antennas.

The further improvement of the present invention is that: the antenna is a variable polarization antenna.

Compared with the prior art, the present invention has the following beneficial technical effects:

The present invention adopts a chiral metamaterial structure with 90-degree rotational symmetry characteristics, does not require multi-layer media and different patch structures, and has a simple structure. At the same time, the present invention adopts an electric field coupling resonant structure, which can make the 90-degree polarization rotator work at The three frequency points in the microwave frequency band greatly increase the practicability of the involved devices. In addition, by arranging the electric field coupling resonant structures in a 90-degree rotationally symmetrical form, the involved 90-degree planned rotator has the characteristic of being insensitive to the polarization angle of the incident ray polarized wave, and is more practical. The microwave frequency band tri-frequency polarization-independent 90-degree polarization rotator of the present invention has a simple structure, can work in multiple frequency bands, is insensitive to the polarization angle of incident ray polarized waves, and has good application prospects.

The microwave-band triple-frequency polarization-independent 90-degree polarization rotator of the present invention can be widely used in antenna design to realize variable-polarization antennas.

Description of drawings

Fig. 1 is a schematic diagram of the superstructure of a microwave-band triple-frequency polarization-independent 90-degree polarization rotator of the present invention;

Fig. 2 is a schematic diagram of the lower structure of the microwave frequency band tri-frequency polarization-independent 90-degree polarization rotator of the present invention;

Fig. 3 is a schematic diagram of the electric field coupling resonant structure of the triple-frequency polarization-independent 90-degree polarization rotator in the microwave frequency band of the present invention;

Fig. 4 is a diagram showing the simulation results of the amplitude-frequency characteristics of the microwave-band tri-frequency polarization-independent 90-degree polarization rotator according to the specific embodiment of the present invention;

Fig. 5 is a diagram showing the simulation results of rotation azimuth and ellipticity of the microwave-band tri-frequency polarization-independent 90-degree polarization rotator according to the specific embodiment of the present invention.

Among them, 1 is the upper metal structure; 2 is the lower metal structure; 3 is the dielectric substrate; 4 is the electric field coupling resonance structure.

Detailed ways

The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

Referring to Fig. 1 and Fig. 2, a microwave-band tri-frequency polarization-independent 90-degree polarization rotator according to the present invention includes a dielectric substrate 3, an upper metal structure 1 is etched on the upper surface of the dielectric substrate 3, and a metal structure 1 is etched on the lower surface Underlying Metal Structure 2. Both the upper metal structure 1 and the lower metal structure 2 are composed of four electric field coupling resonance structures with the same shape arranged in a 90-degree rotational symmetry; the upper metal structure 1 and the lower metal structure 2 are aligned up and down, and the corresponding electric field coupling resonance structures are opposite to each other. Twist 45 degrees.

The working principle of the microwave-band tri-frequency polarization-independent 90-degree polarization rotator provided by the present invention is as follows:

According to the calculation of the Jones matrix, it has been shown that the response of the structure with 90-degree rotational symmetry has nothing to do with the polarization angle of the linearly polarized incident wave. In the present invention, an electric field coupling resonant structure with 90-degree rotational symmetry is etched on the upper and lower surfaces of the dielectric substrate 3, so that the 90-degree polarization rotator involved can convert The polarization angle of the incident wave is rotated by 90 degrees.

The three-frequency polarization-independent 90-degree polarization rotator involved in the microwave frequency band can generate responses at three frequency points in the microwave frequency band, and effectively rotate the polarization angle of a linearly polarized incident wave by 90 at these three frequency points Spend.

After simulation analysis, the microwave frequency band tri-frequency polarization-independent 90-degree polarization rotator of the present invention can make the polarization of the incident ray polarized wave at any polarization angle at the three frequency points 9.7GHz, 11.53GHz and 13.53GHz The angle is rotated 90 degrees.

The metal used in the microwave frequency band tri-frequency polarization-independent 90-degree polarization rotator provided by the present invention is copper, the dielectric substrate 3 is Taconic RF-60, and its relative permittivity is 6.18, and the thickness h of the dielectric plate is 3.18mm. The size is 14mm×14mm; the electric field coupling resonant structure 4 involved includes a ring 41 and two T-shaped metal wires 42; the T-shaped metal wires 42 include a first metal wire 421 and a second metal wire 422; two T-shaped wires The metal wires 42 are symmetrically arranged in the ring 41, the distance between the two first metal wires 421 is g, and the second metal wires 422 connect the corresponding first metal wires 421 and the ring 41; the entire electric field coupling resonant structure 4 is along the The central line of the gap between the two first metal lines 421 is arranged symmetrically, and the entire electric field coupling resonant structure 4 is symmetrical along the central line of the two second metal lines 422 . The geometric dimension parameters are respectively, the radius r=3mm of the ring 41, the width w1=0.4mm of the ring 41, the width w2=1.3mm of the first metal wire 421, the length w3=3.1mm of the first metal wire 421, and the The width of the second metal line 422 is w4 = 0.1 mm, and g = 0.1 mm. The corresponding upper and lower electric field coupling resonant structures overlap up and down, separated by the thickness of the dielectric substrate, and relatively twisted by 45 degrees.

The simulation results of the amplitude-frequency characteristics of the microwave-band triple-frequency polarization-independent 90-degree polarization rotator provided by the present invention are shown in FIG. 4 . The cross-polarization transmission coefficients of the structure at the three frequencies of 9.7GHz, 11.53GHz and 13.53GHz in the microwave frequency band are greater than 0.9, indicating that its efficiency is greater than 90%; If it is less than 0.15, it shows that it effectively suppresses the co-polarization.

Figure 5 shows the polarization rotation angle and ellipticity of the microwave-band tri-frequency polarization-independent 90-degree polarization rotator provided by the present invention. It can be seen from the figure that at the frequencies of 9.7GHz, 11.53GHz and 13.53GHz, the polarization rotation angle is greater than 85 degrees, and the ellipticity is less than 1 degree. This shows that at the three frequency points of 9.7GHz, 11.53GHz and 13.53GHz, the microwave frequency band tri-frequency polarization-independent 90-degree polarization rotator involved has excellent working performance and strong practicability.

In summary, the design method of the microwave-band tri-frequency polarization-independent 90-degree polarization rotator provided by the present invention adopts a twisted electric field coupling resonant structure with 90-degree rotational symmetry characteristics, and designs a simple structure that can It works in three frequency bands of the microwave frequency band, and can rotate the polarization angle of the linearly polarized incident wave at any polarization angle by 90 degrees. The artificial magnetic conductor can be widely used in antenna design to realize variable polarization antennas.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments. It cannot be determined that the specific embodiments of the present invention are limited thereto. Under the premise, some simple inferences or substitutions can also be made, which should be regarded as belonging to the scope of patent protection determined by the claims submitted in the present invention.

Claims (10)

1. A microwave frequency band tri-frequency polarization-independent 90-degree polarization rotator, characterized in that it includes a dielectric substrate (3); the upper surface of the dielectric substrate (3) is provided with an upper metal structure (1), and the lower surface is provided with The lower metal structure (2); the upper metal structure (1) and the lower metal structure (2) are composed of four electric field coupling resonant structures (4) of the same shape arranged in a 90-degree rotationally symmetrical form; the upper metal structure (1) The electric field coupling resonant structure and the electric field coupling resonant structure corresponding to the underlying metal structure (2) are relatively twisted by 45 degrees. 2. A microwave-band tri-frequency polarization-independent 90-degree polarization rotator according to claim 1, characterized in that the electric field coupling resonant structure (4) includes a circular ring (41) and is symmetrically arranged on the circular ring (41 ) within two T-shaped metal wires (42); the T-shaped metal wires (42) include a first metal wire (421) and a second metal wire (422) connected vertically to each other; two T-shaped metal wires (42) Symmetrically arranged in the ring (41), two first metal wires (421) are arranged at intervals, one end of the second metal wire (422) is connected to the first metal wire (421), and the other end is connected to the ring (41). 3. A microwave-band tri-frequency polarization-independent 90-degree polarization rotator according to claim 2, characterized in that the thickness of the dielectric substrate (3) is h, the width and length are both h1; the ring (41 ) radius is r, the width of the ring (41) is w1; the width of the first metal wire (421) is w2, the length of the first metal wire (421) is w3, and the width of the second metal wire (422) is w4, the gap width between two first metal lines (421) is g; h:h1:r:w1:w2:w3:w4:g=3.18:14:3:0.4:1.3:3.1:0.1:0.1 . 4. A microwave-band tri-frequency polarization-independent 90-degree polarization rotator according to claim 3, characterized in that h=3.18mm, h1=14mm, r=3mm, w1=0.4mm, w2=1.3 mm, w3=3.1mm, w4=0.1mm, g=0.1mm. 5. A microwave-band tri-frequency polarization-independent 90-degree polarization rotator according to claim 1, characterized in that the four electric field coupling resonant structures ( 4) They are all arranged in a form of 90-degree rotational symmetry, constituting a chiral metamaterial. 6. A microwave-band tri-frequency polarization-independent 90-degree polarization rotator according to claim 2, characterized in that the positions of the corresponding circular rings on the upper metal structure (1) and the lower metal structure (2) coincide. 7. A microwave-band tri-frequency polarization-independent 90-degree polarization rotator according to claim 1, characterized in that the dielectric substrate (3) is Taconic RF-60, and its relative permittivity is 6.18. 8. A microwave-band triple-frequency polarization-independent 90-degree polarization rotator according to claim 1, characterized in that, the microwave-frequency triple-frequency polarization-independent 90-degree polarization rotator has three The cross-polarization transmission coefficients of frequency points 9.7GHz, 11.53GHz and 13.53GHz are all greater than 0.9, the co-polarization transmission coefficients are all less than 0.15, the polarization rotation angle is greater than 85 degrees, and the ellipticity is less than 1 degree. 9. The application of a microwave-band tri-frequency polarization-independent 90-degree polarization rotator described in any one of claims 1 to 8 in preparing antennas. 10. The application according to claim 9, wherein the antenna is a variable polarization antenna.

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