CN100353610C - Small high isolation degree plane double antenna - Google Patents

Abstract

A small planar double antenna with high isolation is used in the technical field of communication. The present invention includes: antenna unit, feed port, dielectric board and grounding unit, two antenna units are located on the front of the dielectric board, distributed axially symmetrically, and the grounding unit consists of a grounding part on the front of the dielectric board, a grounding part on the back of the dielectric board and a grounding part on the back of the dielectric board. The grounding part at the bottom of the dielectric board is formed and connected as a whole. The grounding part on the front of the dielectric board is divided into three parts: left, middle and right. The middle part is in the shape of a boss, and the core of the feed port is connected to the antenna unit. , the grounding unit is connected to the outer conductor of the feed port. The invention has the advantages of simple structure, smaller distance between antenna units, smaller mutual coupling, high antenna gain when the two antenna units are combined, and relatively uniform distribution within 360 degrees of the horizontal plane.

Description

Small High Isolation Planar Dual Antenna

technical field

The invention relates to an antenna, in particular to a small-sized high-isolation planar double antenna. Used in the field of communication technology.

Background technique

In the prior art, a single antenna is commonly used in communication terminals, which has low gain and poor anti-interference ability. There are a small number of multi-antennas, but in order to eliminate the influence of mutual coupling, the distance between the antenna elements is very large. Therefore, the overall volume of the antenna is very large, and it is not easy to carry.

Through literature search, it is found that the patent application number is 02126816.9, the patent name is: a double antenna capable of controlling radiation characteristics in a foldable mobile communication terminal, and the patent publication number is 1399368. The first directional antenna, and the second directional antenna installed on the main body of the mobile communication terminal. This kind of dual antenna is actually only the second directional antenna that is always in working condition, while the first directional antenna is only used to assist in adjusting the radiation field of the mobile communication terminal during a call. The two antennas cannot be used as two independent antenna units, which also The gain of the antenna is very low when the non-talking state is made. On the other hand, due to the use of directional antennas, omnidirectional signal reception cannot be achieved even if the two antennas work simultaneously.

In the search, it was also found that Tayeb A. Denidni and others published "Experimental Investigations of a New Adaptive Dual-Antenna Array for Handset Applications" in IEEE TRANSACTIONS ONVEHICULAR TECHNOLOGY (vehicle technology), volume 52, No. 6, in November 2003. Experimental Research on Adaptive Dual-antenna Array for Mobile Phones)", using dual-antennas and adaptive algorithms to realize smart antennas in mobile terminals, the distance between the two antenna units is half a wavelength, and two independent antenna units can be realized. However, when the operating frequency is about 1000 MHz, the distance between the antenna elements is too large, and it is difficult to place the antenna on the mobile terminal.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies and defects in the prior art, and provide a small high-isolation planar dual antenna to solve the problem of communication terminals using single antennas, low gain, poor anti-interference ability, and mobile terminals using multiple antennas. , the mutual coupling caused by the close distance of the units cannot be weakened.

The present invention is realized through the following technical solutions, and the present invention includes: an antenna unit, a feeding port, a dielectric plate and a grounding unit. The two antenna units are located on the front of the dielectric board and are distributed axially symmetrically. The grounding unit is composed of a grounding part on the front side of the dielectric board, a grounding part on the reverse side of the dielectric board and a grounding part on the bottom of the dielectric board, which are connected as a whole to improve the radiation characteristics of the antenna. The grounding part located on the front of the dielectric board is divided into three parts: left, middle and right. The middle part is in the shape of a boss. By adjusting the height of the middle boss and the length and width of the grounding units on the left and right sides, the isolation of the antenna can be adjusted. and the distribution of the radiation field. The core of the feeding port is connected to the antenna unit. The ground unit is connected to the outer conductor of the feed port.

The antenna unit is folded at 90 degrees, which can reduce the space occupied by the antenna under the premise of ensuring the electrical length. There is a 45-degree chamfer at the bend, which can adjust the electrical length of the antenna.

The grounding part of the grounding unit located on the front of the dielectric board is divided into three parts: left, middle and right. There is a gap between the left and middle parts, and the one antenna unit passes through this gap; there is a gap between the middle and right parts, so The other antenna unit mentioned above passes through this gap, which can effectively isolate the mutual coupling at the two feeding ports.

The grounding unit is composed of a grounding unit on the front of the dielectric board, a grounding unit on the back of the dielectric board and a grounding unit on the bottom of the dielectric board, and is connected as a whole.

Both the antenna unit and the ground unit are conductors.

The dielectric plate is a material with a high dielectric constant.

Compared with the prior art, the present invention has positive and obvious effects. In the present invention, a common ground with bosses is provided between the two antenna units, and the antenna units are bent to 90 degrees, and the outer chamfer is increased, so that the distance between the antenna units is smaller, The mutual coupling is smaller and becomes two independent antenna elements. Furthermore, when the two antenna units are combined into one antenna, due to the symmetrical structure, the distance between the antenna units is reduced, and the mutual coupling is small, the gain of the antenna is high and the antenna is evenly distributed within 360 degrees of the horizontal plane.

Description of drawings

FIG. 1 is a schematic diagram of the front structure of a small high-isolation planar dual antenna of the present invention.

Fig. 2 is a schematic bottom view of a small high-isolation planar dual antenna of the present invention.

Fig. 3 is a schematic diagram of the back structure of a small high-isolation planar dual antenna of the present invention.

Detailed ways

As shown in FIG. 1 , the present invention includes: a first antenna unit 1 , a dielectric board 2 , a second antenna unit 3 , a ground unit 4 , a first feed port 5 , and a second feed port 6 . The first antenna unit 1 and the second antenna unit 3 are located on the front of the dielectric board 2 and are distributed axially symmetrically. The core of the first feed port 5 is connected to the first antenna unit 1, and the core of the second feed port 6 is connected to the second antenna. The unit 3 is connected, and the grounding unit 4 is composed of a grounding part on the front of the dielectric board, a grounding part on the back of the dielectric board and a grounding part on the bottom of the dielectric board, and is connected as a whole. The grounding part on the front of the dielectric board 2 is divided into Left, middle and right parts, the middle part is in the shape of a boss, there is a gap between the left and middle parts, the first antenna unit 1 passes through this gap, and there is a gap between the middle and right parts, the second antenna unit 3 Go through this gap.

The first antenna unit 1 and the second antenna unit 3 are both monopoles folded at 90 degrees.

The bends of the first antenna unit 1 and the second antenna unit 3 have chamfered corners.

The first antenna unit 1 , the second antenna unit 3 and the ground unit 4 are all conductors.

The grounding unit 4 is connected to the outer conductors of the first feed port 5 and the second feed port 6 .

The dielectric plate 2 is a material with a high dielectric constant.

Claims (5)

1, a kind of small-sized high-isolation plane double antenna, comprise: first antenna element (1), dielectric-slab (2), second antenna element (3), ground unit (4), first feed port (5), second feed port (6), it is characterized in that, first antenna element (1), second antenna element (3) is positioned at dielectric-slab (2) front, axial symmetry distributes, the core of first feed port (5) and first antenna element (1) join, the core of second feed port (6) and second antenna element (3) join, ground unit (4) is by the grounded part that is positioned at the dielectric-slab front, the grounded part that is positioned at the dielectric-slab reverse side constitutes with the grounded part that is positioned at the dielectric-slab bottom, and be communicated with as a whole, be positioned at the positive grounded part of dielectric-slab (2) and be divided into a left side, in, right three parts, mid portion is the shape of band boss, a left side, between the middle part slit is arranged, first antenna element (1) passes this slit, in, the slit is arranged between the right half, and second antenna element (3) passes this slit.

2, small-sized high-isolation plane double antenna according to claim 1 is characterized in that, first antenna element (1), second antenna element (3) all are the monopoles that are converted into 90 degree.

3, small-sized high-isolation plane double antenna according to claim 2 is characterized in that, first antenna element (1), second antenna element (3) bending part have chamfering.

4, according to claim 1 or 2 or 3 described small-sized high-isolation plane double antennas, it is characterized in that first antenna element (1), second antenna element (3) and ground unit (4) are conductor.

5, small-sized high-isolation plane double antenna according to claim 1 is characterized in that, ground unit (4), first feed port (5) and the outer conductor of second feed port (6) are connected.

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