CN209963248U

CN209963248U - Miniaturized microstrip yagi antenna

Info

Publication number: CN209963248U
Application number: CN201920810670.8U
Authority: CN
Inventors: 高怀; 王凯航; 施海健; 田婷; 常颖
Original assignee: Xiamen Innoxun Technology Co Ltd
Current assignee: Xiamen Innoxun Technology Co Ltd
Priority date: 2019-05-31
Filing date: 2019-05-31
Publication date: 2020-01-17
Anticipated expiration: 2029-05-31

Abstract

The utility model discloses a miniaturized microstrip quasi-yagi antenna, which comprises a dielectric substrate, a plurality of rectangular metal patches arranged on two sides of the dielectric substrate, and a plurality of groups of metallized via holes arranged on the dielectric substrate; the rectangular metal patch comprises a reflector, a dipole and a director. The symmetrical vibrators comprise active vibrators arranged on the front side of the dielectric substrate and passive vibrators arranged on the back side of the dielectric substrate, and the active vibrators and the passive vibrators are symmetrically arranged; the reflector comprises a top layer reflector arranged on the front surface of the dielectric substrate and a bottom layer reflector arranged on the back surface of the dielectric substrate; the director is including setting up the director at the positive top layer of medium base plate and setting up the bottom director at the medium base plate back to carry out coupling connection through the metallization via hole, make the utility model discloses just can have higher gain at less volume, simple structure simultaneously, the technology realizes that the degree of difficulty is low grade advantage.

Description

Miniaturized microstrip yagi antenna

Technical Field

The utility model relates to a yagi antenna especially relates to a miniaturized microstrip accurate yagi antenna.

Background

Although the traditional yagi antenna has the advantages of simple structure, high gain and high directivity, the medium in which the yagi antenna is usually located is air, so that the wavelength of electromagnetic waves is high, the size of the antenna is large, and the application scene of the yagi antenna is greatly limited; the microstrip quasi-yagi antenna has been developed greatly because the electromagnetic wave has a shorter propagation wavelength in a medium with a larger relative dielectric constant. With the rapid development of communication technology, higher requirements are put on the size and performance of antennas.

Therefore, how to miniaturize the antenna is a technical problem that needs to be solved in the field on the premise of ensuring that the antenna has high gain.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a miniaturized microstrip accurate yagi antenna reduces the whole volume of antenna under the prerequisite of guaranteeing high-gain.

The technical scheme of the utility model is that:

a miniaturized microstrip quasi-yagi antenna comprises a dielectric substrate, a plurality of rectangular metal patches arranged on two sides of the dielectric substrate, and a plurality of groups of metalized through holes arranged on the dielectric substrate; the rectangular metal patch comprises a reflector, a dipole and a director.

Preferably, the dipoles comprise active dipoles and passive dipoles, which are respectively arranged on the front surface of the dielectric substrate and on the back surface of the dielectric substrate, and the active dipoles and the passive dipoles are symmetrically arranged.

Preferably, the reflectors comprise a top reflector arranged on the front surface of the dielectric substrate and a bottom reflector arranged on the back surface of the dielectric substrate, the top reflector and the bottom reflector are coupled and connected through a group of metalized through holes, and the width of the reflector is larger than that of the dipole.

Preferably, the middle of the top reflector is provided with a slot, and the middle of the top reflector is connected with the active oscillator through a microstrip feeder line and is an input end of the antenna. The middle part of the bottom reflector is provided with a microstrip line which is connected with a passive vibrator.

Preferably, the directors comprise a top layer director arranged on the front surface of the dielectric substrate and a bottom layer director arranged on the back surface of the dielectric substrate, the top layer director and the bottom layer director are coupled and connected by a group of metalized through holes, and the width of the director is smaller than or equal to that of the dipole.

Preferably, the number of the directors is multiple, and the gain of the antenna is increased.

Preferably, the reflector and the director are both arranged on a central line of the dielectric substrate, and the dipoles are arranged on two sides of the central line of the dielectric substrate and are symmetrically arranged.

The utility model has the advantages that:

the utility model discloses a miniaturized microstrip accurate yagi antenna, reflector are including setting up at the positive top layer reflector of dielectric substrate and setting up the bottom reflector at the dielectric substrate back. The director is including setting up the director at the positive top layer of medium base plate and setting up the bottom director at the medium base plate back to carry out coupling connection through the metallization via hole, make the utility model discloses just can have higher gain at less volume, simple structure simultaneously, the technology realizes that the degree of difficulty is low grade advantage.

Drawings

The invention will be further described with reference to the following drawings and examples:

fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic front structural view of the present invention;

fig. 3 is a schematic view of the back structure of the present invention;

fig. 4 is the E & H plane radiation pattern of the present invention at 5.2 GHz.

Detailed Description

As shown in fig. 1, as shown in fig. 1-3, a miniaturized microstrip quasi-yagi antenna includes a dielectric substrate 1, a plurality of rectangular metal patches disposed on two sides of the dielectric substrate 1, and microstrip lines 5 and a plurality of sets of metalized vias 6 disposed on the dielectric substrate 1. The rectangular metal patch comprises a reflector 2, a dipole 3 and a director 4.

The dielectric substrate 1 is made of Teflon material, the loss tangent is about 0.001, the length is 100mm-110mm, and the width is 20-30 mm.

The top reflector 21, the top microstrip feeder 51, the active oscillator 31 and the 7 top director 41 are sequentially placed on the front surface of the dielectric substrate 1 from the right end shown in fig. 2, wherein the top reflector 21 has the largest width, and the active oscillator 31 and the top director 41 can be set to have the same width, so that the backward radiation of the antenna can be better absorbed, and the leakage of backward energy is reduced.

A gap is reserved in the middle of the top reflector 21, the top microstrip feeder 51 is connected with the active oscillator 31, penetrates through the gap to be connected to the right end of the dielectric substrate for feeding, and is an input end of the antenna.

The bottom reflector 22, the bottom microstrip feed line 52, the passive oscillator 32 and 7 bottom directors 42 are arranged on the back surface of the dielectric substrate 1 from the right end shown in fig. 2 in sequence.

The bottom reflector 22 is connected to the parasitic element 32 by a bottom microstrip feed 52.

The reflector 2 is coupled and connected by a top reflector 21 and a bottom reflector 22 through a metallized through hole 6, is positioned on the central line of the rightmost end of the dielectric substrate, and has the length same as the width of the dielectric substrate. The reflector 2 serves both as a reflector for the antenna and as a ground plane.

The symmetrical oscillator 3 is composed of an active oscillator 31 and a passive oscillator 32, is positioned on the left side of the reflector 2, has an adjustable distance with the reflector, is positioned on two sides of the central line of the dielectric substrate and is symmetrically placed, and the length of the symmetrical oscillator is slightly larger than one fourth of the wavelength of the electromagnetic wave in the dielectric.

The director 4 is coupled and connected by a top director 41 and a bottom director 42 through a metallized via hole 6, is positioned on the central line of the dielectric substrate, and is sequentially arranged at the left end of the dipole, and the length and the distance are adjustable, so that the gain of the antenna is in the optimal state. The width of the director is less than or equal to the width of the dipole, so that the radiation energy of the antenna can be better transferred to the end-fire direction.

As shown in fig. 4, in order to obtain the radiation pattern of the microstrip quasi-yagi antenna of the present invention on the E plane and the H plane of 5.2GHz, it can be seen from the figure that the gain of the antenna is about 13dBi when the frequency is 5.2 GHz.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All modifications made according to the spirit of the main technical scheme of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A miniaturized microstrip quasi-yagi antenna is characterized by comprising a dielectric substrate, a plurality of rectangular metal patches arranged on two sides of the dielectric substrate, and a plurality of groups of metalized through holes arranged on the dielectric substrate; the rectangular metal patch comprises a reflector, a dipole and a director.

2. The miniaturized microstrip quasi-yagi antenna according to claim 1, wherein the dipoles comprise active dipoles and passive dipoles respectively disposed on the front and back of the dielectric substrate, and the active dipoles and the passive dipoles are symmetrically disposed.

3. The miniaturized microstrip quasi-yagi antenna of claim 2 wherein the reflectors comprise a top reflector disposed on the front side of the dielectric substrate and a bottom reflector disposed on the back side of the dielectric substrate, the top and bottom reflectors being coupled together by a set of metallized vias, and the reflector width being greater than the dipole width.

4. The miniaturized microstrip quasi-yagi antenna according to claim 3, wherein a slot is opened in the middle of the top reflector, and the middle is connected to the active element through a microstrip feed line, which is the input end of the antenna; the middle part of the bottom reflector is provided with a microstrip line which is connected with a passive vibrator.

5. The miniaturized microstrip quasi-yagi antenna of claim 4 wherein the directors comprise a top layer director disposed on the front surface of the dielectric substrate and a bottom layer director disposed on the back surface of the dielectric substrate, the top layer director and the bottom layer director are coupled by a set of metalized vias, and the director width is less than or equal to the width of the dipole.

6. The miniaturized microstrip quasi-yagi antenna of claim 5 wherein the number of directors is plural.

7. The miniaturized microstrip quasi-yagi antenna of claim 6 wherein the reflector and the director are both disposed on the center line of the dielectric substrate, and the dipoles are disposed symmetrically on both sides of the center line of the dielectric substrate.