CN214754152U - Ultrathin built-in LORA antenna - Google Patents

Abstract

An ultra-thin built-in LORA antenna, comprising: the antenna comprises a circuit board (1), a transmission radio frequency coaxial line (2) and a balanced conversion balun line (3), wherein the thickness of the circuit board (1) is 0.2-0.3 mm, a radiation circuit (11), a feed-in point (12) and a grounding point (13) are arranged on the front surface of the circuit board (1), the radiation circuit (11) is electrically connected with the feed-in point (12), the grounding point (13) is separated from the radiation circuit (11) (namely, the grounding point is not electrically connected), the transmission radio frequency coaxial line (2) is electrically connected with the feed-in point (12), and the balanced conversion balun line (3) is electrically connected with the grounding point (13). Above-mentioned built-in LORA antenna can install in the inside narrow and small gap of equipment casing, makes equipment accord with leakproofness and insulating nature requirement to can realize the conversion balance, provide normal wireless transmission function.

Description

Ultrathin built-in LORA antenna

Technical Field

The utility model belongs to the technical field of the antenna and specifically relates to an ultra-thin built-in LORA antenna is related to.

Background

At present, wireless data acquisition is more and more widely used, and electric meters, gas meters and water meters in people's lives have been upgraded from traditional mechanical meters to wireless intelligent meters, and the intelligent meters are provided with LORA antennas. For the smart meter described above, it is necessary to achieve good sealing (e.g. hermetic grade of IP 67) and insulation, which puts high demands on the antenna.

If a conventional external antenna is adopted, the sealing requirement is difficult to realize, so that an internal antenna is required. However, in order to realize balance conversion, a balun is disposed on an existing built-in LORA antenna, so that the antenna is thick, and the smart meter has a limited internal space, so that the conventional built-in LORA antenna cannot be applied.

SUMMERY OF THE UTILITY MODEL

The utility model discloses technical scheme is to above-mentioned condition, provides an ultra-thin built-in LORA antenna in order to solve above-mentioned problem, built-in LORA antenna includes: the circuit board is 0.2-0.3 mm thick, the front side of the circuit board is provided with a radiation circuit, a feed point and a grounding point, the radiation circuit is electrically connected with the feed point, the grounding point is separated from the radiation circuit, the transmission radio frequency coaxial line is electrically connected with the feed point, and the balance conversion balun line is electrically connected with the grounding point.

Further, the circuit board is the cuboid shape, the length of circuit board is 53 ~ 57mm, and the width is 9 ~ 10 mm.

Further, the back of the circuit board is provided with a double-sided adhesive tape.

Further, the thickness of the double-sided adhesive tape is 0.08-0.12 mm.

Further, the diameter of the transmission radio frequency coaxial line is 1-1.2 mm.

After the technical scheme is adopted, the utility model discloses an effect is: the built-in LORA antenna with the structure can be installed in a narrow gap inside the equipment shell, so that the equipment meets the requirements of sealing property and insulating property, can realize conversion balance and provides a normal wireless transmission function.

Drawings

Fig. 1 is a schematic diagram of a built-in LORA antenna according to the present invention;

fig. 2 is a schematic front view of the circuit board according to the present invention.

Detailed Description

It is specifically noted that, in the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise; the meaning of "several" is at least one. All directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture, and if the specific posture is changed, the directional indicator is changed accordingly.

The technical solution of the present invention is further described below by way of examples:

the utility model provides an ultra-thin built-in LORA antenna, as shown in FIG. 1, built-in LORA antenna includes: the antenna comprises a circuit board 1, a transmission radio frequency coaxial line 2 and a balanced conversion balun line 3, wherein the thickness of the circuit board 1 is 0.2-0.3 mm, as shown in fig. 2, the front surface of the circuit board 1 is provided with a radiation circuit 11, a feed-in point 12 and a grounding point 13, the radiation circuit 11 is electrically connected with the feed-in point 12, the grounding point 13 is separated from the radiation circuit 11 (i.e. is not electrically connected), the transmission radio frequency coaxial line 2 is electrically connected with the feed-in point 12, and the balanced conversion balun line 3 is electrically connected with the grounding point 13.

When the built-in LORA antenna works, the transmission radio frequency coaxial line 2 is electrically connected with the equipment module, and transmits or receives signals through the radiation circuit 11, the frequency band is 400-510 MHz, and the 1/4 wavelength is 120-170 mm. The built-in LORA antenna is unbalanced, and the balance switching of the antenna can be realized through the balance switching balun line 3, so that the antenna reaches a balanced state.

The principle of balance is as follows: when the antenna is used, for the built-in LORA antenna without the balun line, the outer surface of the transmission radio frequency coaxial line has reflected current; for the built-in LORA antenna provided with the balun line, because the unbalanced-to-balanced conversion of the balun line is carried out, the reflected current on the surface of the transmission radio frequency coaxial line is completely transferred to the balun line, and therefore no reflected current exists on the outer surface of the transmission radio frequency coaxial line.

In addition, the gain test shows that when the frequency is 470MHz, the gain of the built-in LORA antenna without the balun line is-26.7 DB; for a built-in LORA antenna with a balun line, the gain is-22 DB. Therefore, the transmission current of the transmission radio frequency coaxial line of the built-in LORA antenna provided with the balun line is transferred onto the balun line to become radiation current, so that the built-in LORA antenna with the balun line has high radiation efficiency and can provide a normal wireless transmission function in the use frequency band.

It is thus clear that the built-in LORA antenna that has above-mentioned structure can install in the inside narrow and small gap of equipment casing, makes equipment accord with leakproofness and insulating nature requirement to can realize the conversion balance, provide normal wireless transmission function.

Specifically, the circuit board 1 is in a rectangular parallelepiped shape, the length L of the circuit board 1 is 53-57 mm, and the width W of the circuit board 1 is 9-10 mm.

Specifically, the back surface of the circuit board 1 has a double-sided tape. The built-in LORA antenna can be fixed in the equipment in a sticking mode, and the installation is convenient.

More specifically, the thickness of the double-sided adhesive tape is 0.08-0.12 mm. Limiting the thickness of the double-sided adhesive tape can avoid an excessive thickness of the entire circuit board 1.

Specifically, the diameter of the transmission radio frequency coaxial line 2 is 1-1.2 mm. The transmission radio frequency coaxial line 2 with the size can be conveniently installed in a small space.

The above-mentioned embodiments are merely preferred examples of the present invention, and do not limit the scope of the present invention, so all equivalent changes or modifications made by the structure, features and principles of the present invention should be included in the claims of the present invention.

Claims (5)

1. An ultra-thin built-in LORA antenna, its characterized in that: the built-in LORA antenna includes: the antenna comprises a circuit board (1), a transmission radio frequency coaxial line (2) and a balanced conversion balun line (3), wherein the thickness of the circuit board (1) is 0.2-0.3 mm, a radiation circuit (11), a feed-in point (12) and a grounding point (13) are arranged on the front surface of the circuit board (1), the radiation circuit (11) is electrically connected with the feed-in point (12), the grounding point (13) is separated from the radiation circuit (11), the transmission radio frequency coaxial line (2) is electrically connected with the feed-in point (12), and the balanced conversion balun line (3) is electrically connected with the grounding point (13).

2. The ultra-thin built-in LORA antenna of claim 1, wherein: the circuit board (1) is cuboid, the length of circuit board (1) is 53 ~ 57mm, and the width is 9 ~ 10 mm.

3. The ultra-thin built-in LORA antenna of claim 1, wherein: the back of the circuit board (1) is provided with a double-sided adhesive tape.

4. The ultra-thin built-in LORA antenna of claim 3, wherein: the thickness of the double-sided adhesive tape is 0.08-0.12 mm.

5. The ultra-thin built-in LORA antenna of claim 1, wherein: the diameter of the transmission radio frequency coaxial line (2) is 1-1.2 mm.

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