CN108899640A - Orientation miniature antenna based on pure oscillation curve - Google Patents

Abstract

The invention discloses a directional miniature antenna based on a sinusoidal oscillation curve, comprising a dielectric substrate, an upper radiation unit, a metal microstrip feeder and a lower radiation unit, wherein the upper radiation unit and the metal microstrip feeder are printed on the upper surface of the dielectric substrate, The upper radiating unit includes an arc patch and an elliptical patch, the lower radiating unit is printed on the lower surface of the dielectric substrate, the lower radiating unit includes a lower radiating patch, and the lower radiating patch is composed of circular groove lines, parallel groove lines, A closed figure formed by the sinusoidal oscillating trough line, the two long sides on the outside of the lower radiation patch, and the short side coincident with the x-axis. The invention has lower return loss, good directivity and standing wave, and wider frequency band, thereby being able to efficiently receive radio frequency energy in the environment.

Description

Directional Miniature Antenna Based on Sinusoidal Oscillating Curve

technical field

The invention belongs to the technical field of electromagnetic energy receiving antennas, in particular to a directional miniature antenna based on sinusoidal oscillation curves for receiving radio frequency energy in the environment.

Background technique

In recent years, with the continuous increase of RF signal sources, environmental RF energy harvesting has attracted more and more attention. Advances in RF energy harvesting technology have made it possible to continuously power small, low-power electronic devices. Microstrip antennas are crucial to radio frequency energy harvesting systems, and their small size, light weight, and good directivity are of great significance to the development of energy harvesting technologies.

Contents of the invention

The technical problem solved by the present invention is to provide a directional miniature antenna based on a sinusoidal oscillation curve with a simple structure and a reasonable design. Compared with other antennas, the antenna has smaller size, relatively lower return loss, wider frequency band and good directivity.

The present invention adopts the following technical scheme to solve the above-mentioned technical problems. The directional micro-antenna based on the sinusoidal oscillation curve is characterized in that it includes a dielectric substrate, an upper radiation unit, a metal microstrip feeder and a lower radiation unit; the dielectric substrate is rectangular, and its material It is FR4, the dielectric constant ε _r =4.4, the thickness d=1.6mm, the length is 55mm, and the width is 40mm; the upper radiation unit and the metal microstrip feeder are printed on the upper surface of the dielectric substrate, and the design of the upper radiation unit And the size meets the following requirements: the upper radiating unit includes a curved patch and an elliptical patch, the curved patch is composed of two exponential gradient lines, two vertical lines and a horizontal line, and the two exponential gradient lines are respectively It is an inner exponential asymptote and an outer exponential asymptote. The inner exponential asymptote satisfies the following equation y=5e ^-0.5x , and the outer exponential asymptote is obtained by moving the inner exponential asymptote upward by 18.14mm. The center point of the side short side is the origin to establish a plane Cartesian coordinate system. The right endpoints of the two exponential asymptotes are A and B respectively. The endpoints A and B are connected by the vertical line AB. The coordinates of the endpoints A and B are A (14.182, 46.175), B(14.182, 27.9), the lower end of the outer exponential asymptote is connected with the vertical line CD, and the coordinates of C and D at the two ends of the vertical line CD are respectively C(1.3, 14.182), D(1.3, 0), vertical Both the end of the line CD and the end of the inner exponential asymptote are flush with the edge of the dielectric substrate, and the elliptical patch meets the following requirements: conforming to the formula The length of the real axis is 15 mm, and the length of the imaginary axis is 9 mm; the lower radiation unit is printed on the lower surface of the dielectric substrate, and the design and size of the lower radiation unit meet the following requirements: the lower radiation unit includes the lower radiation patch, the lower radiation patch The length is 55mm, the width is 38mm, the conductor patch is symmetrical about the y-axis direction, the slot lines in the lower radiation patch include circular slot lines, parallel slot lines and sinusoidal oscillation slot lines, where the center coordinate of the circular slot line is O is (0,12.7), the radius is 4mm, one end of two symmetrical parallel groove lines about the y-axis is connected to the upper part of the circular groove line, the distance between the parallel groove lines is 1mm, the parallel groove line and the circular groove line The coordinates of the connected two points are E(0.5, 16.5), F(-0.5, 16.5), the circular grooves between the parallel grooves are open structures, and the other ends of the parallel grooves are respectively connected with two One end of a symmetric sinusoidal oscillating slot line is connected, and the sinusoidal oscillating slot line satisfies the equation Two sinusoidal oscillating groove lines symmetrical about the y-axis direction respectively extend to the front side of the dielectric substrate and the opening size of the sinusoidal oscillating groove lines at the two vertices is 40mm. The closed figure formed by the two long sides on the outside of the patch and the short sides of the lower radiation patch coincident with the x-axis forms the lower radiation unit; one end of the metal microstrip feeder is connected to the arc-shaped patch, and the other end of the metal microstrip feeder It is connected with the bottom end of the dielectric substrate; the bottom end of the radiation unit in the lower layer is connected with the bottom end of the dielectric substrate.

Compared with other antennas, the invention has smaller size, relatively lower return loss, wider frequency band and good directivity.

Description of drawings

Fig. 1 is a schematic diagram of the radiation patch on the upper layer of the directional micro-antenna based on the sinusoidal oscillation curve;

Fig. 2 is a schematic diagram of the radiation patch on the lower layer of the directional micro-antenna based on the sinusoidal oscillation curve;

Fig. 3 is the structural representation of the directional miniature antenna based on the sinusoidal oscillation curve;

Fig. 4 is the return loss figure of the directional miniature antenna based on sinusoidal oscillation curve;

Fig. 5 is a 3D radiation pattern diagram of a directional miniature antenna based on a sinusoidal oscillation curve.

In the figure: 1-elliptical patch, 2-arc patch, 3-metal microstrip feeder, 4-upper surface of dielectric substrate, 5-lower surface of dielectric substrate, 6-sinusoidal oscillation groove line, 7-circular groove Line, 8-dielectric substrate, 9-upper radiation unit, 10-lower radiation unit.

Detailed ways

In the following, the technical solutions in the specific implementation process of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. As shown in Figure 1-3, the directional miniature antenna based on the sinusoidal oscillation curve includes a dielectric substrate 8, an upper radiation unit 9, a metal microstrip feeder 3 and a lower radiation unit 10; the dielectric substrate 8 is rectangular, and its material is FR4 , dielectric constant ε _r =4.4, thickness d=1.6mm, length 55mm, width 40mm; the upper radiation unit 9 and the metal microstrip feeder 3 are printed on the upper surface 4 of the dielectric substrate, wherein the upper radiation unit 9 The design and size meet the following requirements: the upper radiation unit 9 includes an arc patch 2 and an oval patch 1, the arc patch 2 is composed of two exponential gradient lines, two vertical lines and a horizontal line, two The two exponential asymptotes are respectively the inner exponential asymptote and the outer exponential asymptote, the inner exponential asymptote satisfies the following equation y=5e ^-0.5x , and the outer exponential asymptote is translated upward by 18.14mm from the inner exponential asymptote As a result, a plane Cartesian coordinate system is established with the center point of the short side of the lower side of the dielectric substrate as the origin. The right endpoints of the two exponential asymptotes are A and B respectively, and the endpoints A and B are connected by a vertical line AB. The coordinates of the endpoints A and B They are A(14.182, 46.175), B(14.182, 27.9), the lower end of the outer exponential asymptote is connected with the vertical line CD, and the coordinates of C and D at the two ends of the vertical line CD are C(1.3, 14.182), D( 1.3, 0), the end of the vertical line CD and the end of the inner exponential asymptote are flush with the edge of the dielectric substrate 8, and the elliptical patch 1 meets the following requirements: it meets the formula The length of the real axis is 15 mm, and the length of the imaginary axis is 9 mm; the lower radiation unit 10 is printed on the lower surface 5 of the dielectric substrate, and the design and size of the lower radiation unit 10 meet the following requirements: the lower radiation unit 10 includes the lower radiation patch, The length of the lower radiation patch is 55mm, and the width is 38mm. The conductor patch is symmetrical about the y-axis direction. The slot lines in the lower radiation patch include circular slot lines 7, parallel slot lines and sinusoidal oscillation slot lines 6, among which the circular slot lines The center coordinate O of the groove line 7 is (0,12.7), and the radius is 4mm. One end of two parallel groove lines symmetrical about the y-axis direction is connected to the upper part of the circular groove line 7, and the distance between the parallel groove lines is 1mm. The coordinates of the two ends of the parallel groove line and the circular groove line 7 are E (0.5, 16.5), F (-0.5, 16.5) respectively, and the circular groove line 7 between the parallel groove lines is an open structure, and the parallel groove line The other ends of are respectively connected to one end of two sinusoidal oscillating groove lines 6 that are symmetrical about the y-axis direction, and the sinusoidal oscillating groove lines 6 satisfy the equation Two sinusoidal oscillation groove lines 6 that are symmetrical about the y-axis direction respectively extend to the upper part of the dielectric substrate 8 and the opening size of the sinusoidal oscillation groove lines 6 at the two vertices is 40 mm. The circular groove lines 7, parallel groove lines, and sinusoidal oscillation groove lines 6. The lower radiation unit 10 is formed by a closed figure formed by the two long sides on the outside of the lower radiation patch and the short sides of the lower radiation patch coincident with the x-axis; one end of the metal microstrip feeder 3 is connected to the arc patch 2, The other end of the metal microstrip feeder 3 is connected to the bottom end of the dielectric substrate 8 ; the bottom end of the lower radiation unit 10 is connected to the bottom end of the dielectric substrate 8 .

Fig. 4 is a return loss diagram of the directional micro-antenna based on the sinusoidal oscillation curve. It can be seen from the figure that the return loss of the directional micro-antenna based on the sinusoidal oscillation curve is -32.5dB, and the performance is good.

Figure 5 is a 3D radiation pattern of the directional micro-antenna based on the sinusoidal oscillation curve. It can be seen from the figure that the maximum gain of the directional micro-antenna based on the sinusoidal oscillation curve is 2.07dB at 2.45GHz, and the directivity is good.

The above embodiments have described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What are described in the above embodiments and description are only to illustrate the principles of the present invention. Without departing from the scope of the principle of the present invention, there will be various changes and improvements in the present invention, and these changes and improvements all fall within the protection scope of the present invention.

Claims (1)

1. The directional miniature antenna based on the sinusoidal oscillation curve is characterized in that it comprises a dielectric substrate, an upper radiation unit, a metal microstrip feeder and a lower radiation unit; the dielectric substrate is rectangular, and its material is FR4, and the dielectric constant ε _r =4.4 , thickness d=1.6mm, length 55mm, and width 40mm; the upper radiation unit and the metal microstrip feeder are printed on the upper surface of the dielectric substrate, wherein the design and size of the upper radiation unit meet the following requirements: the upper radiation unit Including an arc patch and an elliptical patch, the arc patch is composed of two exponential gradient lines, two vertical lines and a horizontal line, and the two index asymptote lines are respectively the inner exponential asymptote and the outer exponential asymptote Near line, the inner exponential asymptote satisfies the following equation y=5e ^-0.5x , the outer exponential asymptote is obtained by the upward translation of the inner exponential asymptote by 18.14mm, and a plane right angle is established with the center point of the short side of the lower side of the dielectric substrate as the origin In the coordinate system, the right endpoints of the two exponential asymptotes are A and B, and the endpoints A and B are connected by a vertical line AB. The coordinates of the endpoints A and B are A (14.182, 46.175), B (14.182, 27.9), The lower end of the outer exponential asymptote is connected with the vertical line CD, the coordinates of the two ends C and D of the vertical line CD are respectively C(1.3, 14.182), D(1.3, 0), the end of the vertical line CD and the end of the inner exponential asymptote are all flush with the edge of the dielectric substrate, and the elliptical patches meet the following requirements: conform to the formula The length of the real axis is 15 mm, and the length of the imaginary axis is 9 mm; the lower radiation unit is printed on the lower surface of the dielectric substrate, and the design and size of the lower radiation unit meet the following requirements: the lower radiation unit includes the lower radiation patch, the lower radiation patch The length is 55mm, the width is 38mm, the conductor patch is symmetrical about the y-axis direction, the slot lines in the lower radiation patch include circular slot lines, parallel slot lines and sinusoidal oscillation slot lines, and the center coordinates of the circular slot lines are O It is (0,12.7), the radius is 4mm, one end of two symmetrical parallel groove lines about the y-axis is connected to the upper part of the circular groove line, the distance between the parallel groove lines is 1mm, the parallel groove line and the circular groove line The coordinates of the connected two points are E(0.5, 16.5), F(-0.5, 16.5) respectively, the circular groove line between the parallel groove lines is an open structure, and the other ends of the parallel groove lines are respectively connected with two One end of a symmetric sinusoidal oscillating slot line is connected, and the sinusoidal oscillating slot line satisfies the equation Two sinusoidal oscillation groove lines symmetrical about the y-axis direction respectively extend to the front side of the dielectric substrate, and the opening size of the sinusoidal oscillation groove lines at the two vertices is 40 mm. The closed figure formed by the two long sides on the outside of the patch and the short sides of the lower radiation patch coincident with the x-axis forms the lower radiation unit; one end of the metal microstrip feeder is connected to the arc-shaped patch, and the other end of the metal microstrip feeder It is connected with the bottom end of the dielectric substrate; the bottom end of the radiation unit in the lower layer is connected with the bottom end of the dielectric substrate.