Miniaturized high-gain planar yagi antenna

Abstract

The utility model relates to a miniaturized high-gain planar yagi antenna which comprises a base material, a pair of transmitting oscillators are printed on the upper plane of the base material and used for transmitting or receiving signals, and the two transmitting oscillators are connected in series and are connected and led out through a coaxial line. And a parasitic director oscillator is printed on the upper plane of the base material above the two transmitting oscillators and is used for enhancing directivity. According to the invention, the yagi antenna is adjusted from a stick-shaped three-dimensional structure to a structure in which the radio frequency microstrip line is printed on the epoxy glass fiber board base material, so that the whole yagi antenna is flat, small in size and high in gain, and is convenient to install due to the addition of the plugging pins.

Description

Technical Field

[0001] The present invention relates to the field of communication technologies, and particularly to a miniaturized high-gain semi-omnidirectional planar Yagi antenna. Background Art

[0002] Yagi antennas have high gain and strong directivity, and are often used in outdoor occasions with large spaces for television, radar signal transmission and direction finding. A typical Yagi antenna is often constructed in a three-dimensional manner, occupying a large space and cannot be placed in a narrow housing. Therefore, there is an urgent need to reduce the antenna size and change the antenna form. In some occasions with high gain requirements, antennas with small size, high gain and quick installation are needed. Summary of the Invention

[0003] The purpose of the present invention is to overcome the problems existing in the prior art, and provide a miniaturized high-gain planar Yagi antenna. The Yagi antenna is adjusted from a rod-shaped three-dimensional composition form to a way of printing radio frequency microstrip lines on an epoxy glass fiber board substrate, realizing miniaturization and flattening of the antenna, and adding plug-in pins for convenient installation.

[0004] To achieve the above technical purpose and reach the above technical effect, the present invention is realized through the following technical solutions:

[0005] A miniaturized high-gain planar Yagi antenna includes a substrate. A pair of transmitting elements are printed on the upper plane of the substrate for transmitting or receiving signals. The two transmitting elements are connected in series and led out by a coaxial cable. A parasitic director is printed on the upper plane of the substrate above the two transmitting elements for enhancing directivity.

[0006] Further, a grounding pin is connected to the lower end of the transmitting element, and the grounding pin is connected to the corresponding product reference ground terminal.

[0007] Further, the substrate extends a convex portion at the grounding pin, and a slot is provided on the product reference ground terminal. The substrate inserts the grounding pin into the slot of the product reference ground terminal through the convex portion.

[0008] Further, the transmitting element is in an F shape, and the F openings between the two transmitting elements are arranged back to back.

[0009] Further, the length of the horizontal F branch of the transmitting element is λ / 2.

[0010] Further, the substrate is an epoxy glass fiber board FR4.

[0011] The beneficial effects of the present invention are:

[0012] The present invention adjusts the Yagi antenna from a rod-shaped three-dimensional structure to a structure of printing radio frequency microstrip lines on an epoxy glass fiber board substrate, which is overall flattened, small in size, high in gain, and has plug-in pins added for convenient installation. Description of the Drawings

[0013] Figure 1 It is a schematic assembly structure diagram of the antenna of the present invention;

[0014] Figure 2 It is a schematic exploded structure diagram of the antenna of the present invention;

[0015] Figure 3 It is a return loss diagram of the antenna of the present invention;

[0016] Figure 4 It is the radiation pattern of the antenna of the present invention.

[0017] Explanation of the reference numerals in the figure: 1. Substrate, 2. Transmitting oscillator, 3. Coaxial cable, 4. Parasitic director oscillator, 5. Grounding pin, 6. Product reference ground end. Detailed Embodiment

[0018] The present invention will be described in detail below with reference to the drawings and in combination with embodiments.

[0019] As Figure 1 and Figure 2 shown, a miniaturized high-gain planar Yagi antenna includes a substrate 1, and a pair of transmitting oscillators 2 are printed on the upper plane of the substrate 1 for transmitting or receiving signals. The two transmitting oscillators 2 are connected in series and led out by a coaxial cable 3 for leading out signals. In this embodiment, a 50Ω coaxial cable 3 is used. A parasitic director oscillator 4 is printed on the upper plane of the substrate 1 above the two transmitting oscillators 2 for enhancing directivity. In this embodiment, the parasitic director oscillator 4 is a horizontal rectangular strip.

[0020] The lower end of the transmitting oscillator 2 is connected with a grounding pin 5, and the grounding pin 5 is connected to the corresponding product reference ground end 6.

[0021] The substrate 1 extends a raised portion at the grounding pin 5, and a slot is provided on the product reference ground end 6. The substrate 1 inserts the grounding pin 5 into the slot of the product reference ground end 6 through the raised portion.

[0022] The transmitting oscillator 2 is in an F shape, and the F openings between the two transmitting oscillators 2 are arranged back to back, forming four oscillator branches.

[0023] The length of the horizontal F branch of the transmitting oscillator 2 is λ / 2.

[0024] The substrate 1 is an epoxy glass fiber board FR4.

[0025] AsFigure 3 As shown, it is the return loss diagram of this antenna. From the perspective of S parameters, this antenna has a good bandwidth. The return loss from 5.644 GHz to 6.98 GHz can reach below -10 dB, the bandwidth is about 1.3 GHz, the lowest resonance point is at 5.996 GHz, and the return loss at the wave trough reaches -29 dB.

[0026] As Figure 4 shown, it is the antenna pattern. This antenna is a directional high-gain antenna, and the antenna gain reaches 6.32 dBi.

[0027] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A miniaturized high-gain planar Yagi antenna, comprising a substrate (1), characterized in that, A pair of transmitting oscillators (2) are printed on the upper plane of the substrate (1) for transmitting or receiving signals. The two transmitting oscillators (2) are connected in series and led out by a coaxial cable (3). A parasitic director oscillator (4) is printed on the upper plane of the substrate (1) above the two transmitting oscillators (2) for enhancing directivity.

2. The miniaturized high-gain planar Yagi antenna according to claim 1, wherein A grounding pin (5) is connected to the lower end of the transmitting oscillator (2), and the grounding pin (5) is connected to the corresponding product reference ground end (6).

3. The miniaturized high-gain planar Yagi antenna according to claim 2, characterized in that, The substrate (1) extends a convex portion at the grounding pin (5). A slot is provided on the product reference ground end (6). The substrate (1) inserts the grounding pin (5) into the slot of the product reference ground end (6) through the convex portion.

4. The miniaturized high-gain planar Yagi antenna according to claim 1 or 3, characterized in that, The transmitting oscillator (2) is in an F shape, and the F openings between the two transmitting oscillators (2) are arranged back to back.

5. The miniaturized high-gain planar Yagi antenna according to claim 4, wherein The length of the horizontal F branch of the transmitting oscillator (2) is λ / 2.

6. The miniaturized high-gain planar Yagi antenna according to claim 1, characterized in that The substrate (1) is an epoxy glass fiber board FR4.

Images