CN103500880B - Symmetrical four-red-heart-shapearray array antenna - Google Patents

Abstract

The invention discloses a symmetrical four-red heart-shaped array antenna. It includes substrate, X-shaped patch, four metal connection lines, four heart-shaped patches, impedance matching input transmission line, metal grounding plate; the upper surface of the substrate is provided with X-shaped patch, four metal connection lines, four The heart-shaped patch and the impedance matching input transmission line, the four terminals of the X-shaped patch are respectively connected to the four heart-shaped patches through four metal connecting lines; the lower surface of the substrate is provided with a metal grounding plate, and the metal grounding plate is provided with Slotted; the top end of the impedance matching input transmission line is connected to the X-shaped patch, the bottom end of the impedance matching input transmission line is connected to the bottom end of the substrate, and the bottom end of the metal ground plate is connected to the bottom end of the substrate. The invention has the advantages of low loss, good radiation characteristics, light weight, small volume, low production cost, easy integration and the like.

Description

Symmetrical Quad Cardioid Array Antenna

technical field

The invention relates to antennas, in particular to a symmetrical four-red heart-shaped array antenna.

Background technique

An antenna is a device that can transmit and receive electromagnetic waves and is an essential part of any wireless communication system. The functions of each communication device may be different, but the functions of the antenna in the communication device are the same. The task of the antenna is to convert the high-frequency current energy (guided wave) output by the transmitter into electromagnetic waves to radiate into space, or convert the space radio signal into high-frequency current energy and send it to the receiver. Generally, antennas are reversible, and the same pair of antennas can be used as both a transmitting antenna and a receiving antenna. That is to say, the performance of the same antenna is the same when sending and receiving electromagnetic waves, which is the reciprocity principle of the antenna.

Compared with conventional microwave antennas, it has the following advantages: small size, light weight, low profile, and can be conformal to the carrier; low manufacturing cost, easy to mass-produce; the scattering cross-section of the antenna is small; because the radiation patch is based on reflection board, so a single-directional lobe pattern can be obtained, and the maximum radiation direction is in the normal direction of the plane; it is easy to integrate with microstrip lines; it is easy to realize linear polarization and circular polarization, and it is easy to realize dual-frequency, dual-polarization, etc. Functional working mode. And the microstrip antenna array composed of microstrip antennas with the same structure can obtain higher gain and larger impedance bandwidth. It is precisely because of so many advantages that microstrip antennas will be paid more and more attention.

Contents of the invention

The present invention provides a symmetrical four-red heart-shaped array antenna, and the technical scheme is as follows:

The symmetrical four-red heart-shaped array antenna includes a substrate, an X-shaped patch, four metal connecting lines, four heart-shaped patches, an impedance matching input transmission line, and a metal grounding plate; the upper surface of the substrate is provided with an X-shaped patch, four metal Connecting wires, four heart-shaped patches and impedance-matched input transmission lines, the four terminals of the X-shaped patch are respectively connected to the four heart-shaped patches through four metal connecting lines, and the four heart-shaped patches have the same size, The four heart-shaped patches are symmetrical about the longitudinal center axis of the substrate; the lower surface of the substrate is provided with a metal grounding plate, and the metal grounding plate is provided with slots; the top of the impedance matching input transmission line is connected to the X-shaped patch, and the impedance matching input The bottom end of the transmission line is connected with the bottom end of the substrate, and the bottom end of the metal ground plate is connected with the bottom end of the substrate.

The substrate is made of glass fiber epoxy resin material, the length of the substrate is 30mm-32mm, and the width is 25mm-27mm. The length of the X-shaped patch is 10 mm to 11 mm, and the metal width of the patch is 1 mm to 2 mm. The width of the metal connection line is 0.70mm-0.80mm. The heart-shaped patch is a symmetrical structure up and down, and it consists of four circular arcs and a straight line; the length of the straight line is 2 mm to 3 mm, and the central angles corresponding to the large and small circular arcs are 86° and 180° respectively. , The radii of the small arcs are 3.7mm-3.9mm and 1.0mm-1.2mm respectively. The length of the impedance matching input transmission line is 13.3mm-13.5mm, and the width is 2.0mm-2.2mm. The metal grounding plate has a length of 30mm-32mm and a width of 12mm-14mm. The slotting is composed of a rectangle and a semicircle; the length of the rectangle is 10mm-11mm, the width is 3mm-4mm, and the radius of the semicircle is 3mm-4mm.

The symmetrical four-red heart-shaped array antenna of the invention has the advantages of low loss, good radiation characteristics, light weight, small volume, low manufacturing cost, and easy integration.

Description of drawings

Figure 1 is a schematic diagram of the front structure of a symmetrical four-red heart-shaped array antenna;

Figure 2 is a schematic diagram of the back structure of the symmetrical four-red heart-shaped array antenna;

Fig. 3 is the S-parameter curve diagram of the symmetrical four-red heart-shaped array antenna;

Figure 4 is the E-plane radiation pattern of the antenna at 8.56GHz;

Figure 5 is the H-plane radiation pattern of the antenna at 8.56GHz.

detailed description

As shown in Figures 1-2, the symmetrical four-red heart-shaped array antenna includes a substrate 1, an X-shaped patch 2, four metal connecting lines 3, four heart-shaped patches 4, an impedance-matched input transmission line 5, and a metal ground plate 6; The upper surface of the substrate 1 is provided with an X-shaped patch 2, four metal connecting lines 3, four heart-shaped patches 4 and an impedance matching input transmission line 5, and the four terminals of the X-shaped patch 2 pass through four metal connecting lines respectively. 3 is connected with four heart-shaped patches 4, the four heart-shaped patches 4 have the same size, and the four heart-shaped patches 4 are symmetrical about the longitudinal center axis of the substrate 1; the lower surface of the substrate 1 is provided with a metal grounding plate 6. There is a slot 7 on the metal ground plate 6; the top end of the impedance matching input transmission line 5 is connected to the X-shaped patch 2, the bottom end of the impedance matching input transmission line 5 is connected to the bottom end of the substrate 1, and the bottom end of the metal ground plate 6 The terminal is connected to the bottom end of the substrate 1.

The substrate 1 is made of glass fiber epoxy resin material, the length of the substrate 1 is 30mm-32mm, and the width is 25mm-27mm. The length of the X-shaped patch 2 is 10mm-11mm, and the width of the patch metal is 1mm-2mm. The width of the metal connecting wire 3 is 0.70mm-0.80mm. The heart-shaped patch 4 is a symmetrical structure up and down, and it is composed of four circular arcs and a straight line; the length of the straight line is 2 mm to 3 mm, and the central angles corresponding to the large and small circular arcs are 86° and 180° respectively, The radii of the large and small arcs are 3.7mm-3.9mm and 1.0mm-1.2mm respectively. The impedance-matched input transmission line 5 has a length of 13.3 mm to 13.5 mm and a width of 2.0 mm to 2.2 mm. The metal ground plate 6 has a length of 30mm-32mm and a width of 12mm-14mm. The slot 7 is composed of a rectangle and a semicircle; the length of the rectangle is 10mm-11mm, the width is 3mm-4mm, and the radius of the semicircle is 3mm-4mm.

Example 1

A glass fiber epoxy resin material with a dielectric constant of 4.4 is selected to make a microstrip substrate with a thickness of 1.6 mm. The substrate has a length of 30 mm and a width of 25 mm. The length of the X-shaped patch is 10mm, and the width of the patch metal is 1mm. The width of the metal connecting wire is 0.70mm. The heart-shaped patch is a symmetrical structure up and down. It consists of four arcs and a straight line; the length of the straight line is 2mm, and the central angles corresponding to the large and small arcs are 86° and 180° respectively. The radii are 3.7mm and 1.0mm, respectively. The impedance-matched input transmission line has a length of 13.3mm and a width of 2.0mm. The metal ground plate has a length of 30mm and a width of 12mm. The slot consists of a rectangle and a semicircle; the length of the rectangle is 10mm, the width is 3mm, and the radius of the semicircle is 3mm. The performance indicators of the symmetrical four-red heart-shaped array antenna are tested and analyzed by CST software. The obtained S-parameter curve is shown in Figure 3. It can be seen from the figure that the working frequency band below -10dB is 8.31GHz to 8.82GHz. Figure 4 and Figure 5 show the E-plane and H-plane patterns of the antenna at 8.56GHz. It can be seen from the figure that when the frequency is 8.56GHz, the gain of the antenna is 3.3dBi, and the half-power lobe width is 53.2°.

Claims (8)

1. A symmetrical four-red heart-shaped array antenna is characterized in that it includes a substrate (1), an X-shaped patch (2), four metal connecting wires (3), four heart-shaped patches (4), and an impedance matching input Transmission line (5), metal grounding plate (6); X-shaped patches (2), four metal connecting lines (3), four heart-shaped patches (4) and impedance matching are arranged on the upper surface of the substrate (1) Input the transmission line (5), and the four end points of the X-shaped patch (2) are respectively connected to the four heart-shaped patches (4) through four metal connecting lines (3), and the four heart-shaped patches (4) have the same The size of the four heart-shaped patches (4) is symmetrical about the longitudinal central axis of the substrate (1); the lower surface of the substrate (1) is provided with a metal grounding plate (6), and the metal grounding plate (6) is provided with an opening slot (7); the top end of the impedance matching input transmission line (5) is connected to the X-shaped patch (2), the bottom end of the impedance matching input transmission line (5) is connected to the bottom end of the substrate (1), and the metal grounding plate (6) The bottom end of the base plate (1) is connected with the bottom end. 2. A symmetrical four-red heart-shaped array antenna according to claim 1, characterized in that the substrate (1) is made of glass fiber epoxy resin material, the length of the substrate (1) is 30mm to 32mm, and the width is 25mm ~27mm. 3. A symmetrical four-red heart-shaped array antenna according to claim 1, characterized in that the length of the X-shaped patch (2) is 10mm-11mm, and the width of the patch metal is 1mm-2mm. 4. A symmetrical four-red heart-shaped array antenna according to claim 1, characterized in that the width of the metal connecting wire (3) is 0.70mm-0.80mm. 5. A kind of symmetrical four-red heart-shaped array antenna according to claim 1, characterized in that said heart-shaped patch (4) is a symmetrical structure up and down, and it is made up of four arcs and a straight line; the length of the straight line The center angles corresponding to the large and small arcs are 86° and 180° respectively, and the radii of the large and small arcs are 3.7mm to 3.9mm and 1.0mm to 1.2mm respectively. 6. A symmetrical four-red heart-shaped array antenna according to claim 1, characterized in that the impedance-matched input transmission line (5) has a length of 13.3 mm to 13.5 mm and a width of 2.0 mm to 2.2 mm. 7. A symmetrical four-red heart-shaped array antenna according to claim 1, characterized in that the metal ground plate (6) has a length of 30mm-32mm and a width of 12mm-14mm. 8. A symmetrical four-red heart-shaped array antenna according to claim 1, characterized in that the slot (7) is composed of a rectangle and a semicircle; the length of the rectangle is 10 mm to 11 mm, and the width is 3 mm to 4 mm , The radius of the semicircle is 3mm ~ 4mm.