CN217468786U

CN217468786U - Ultra-low frequency thin omnidirectional antenna

Info

Publication number: CN217468786U
Application number: CN202221473076.2U
Authority: CN
Inventors: 陈辉
Original assignee: Guangdong Anjiexin Communication Equipment Co ltd
Current assignee: Guangdong Anjiexin Communication Equipment Co ltd
Priority date: 2022-06-13
Filing date: 2022-06-13
Publication date: 2022-09-20
Anticipated expiration: 2032-06-13

Abstract

The utility model discloses a slim omnidirectional antenna of ultralow frequency, including PCB board, antenna radiator, matching resistor and feeder, antenna radiator, matching resistor set up the first face at the PCB board, and the antenna radiator includes two radiating element, and matching resistor's one end is connected with one of two radiating element electricity, and matching resistor's the other end is connected with another one of two radiating element electricity, and two radiating element are connected to the feeder electricity. The antenna has a simple structure and a small volume, the frequency of the antenna covers a 132MHz-960MHz frequency band, the standing wave ratio is less than 1.8 in the 132MHz-174MHz frequency band, a 380MHz-520MHz frequency band and a 600MHz-960MHz frequency band, and the use of indoor interphone receiving and transmitting signals and the communication requirement of the 600MHz-960MHz frequency band can be met.

Description

Ultra-low frequency thin omnidirectional antenna

Technical Field

The utility model relates to an antenna design technical field especially relates to a slim omnidirectional antenna of ultralow frequency.

Background

The frequency bands used by the interphone comprise 132MHz-174MHz and 380MHz-520MHz, in the prior art, a double-cone oscillator structure antenna is adopted to cover the frequency bands used by the interphone, for example, two cones which are symmetrical up and down are obtained by stamping metal and are used as antenna radiation oscillators, the stamping die sinking cost is high, the production efficiency is low, and if the working frequency band of 132MHz-520MHz is required to be met, the required cone oscillator is large in size, difficult to produce and not attractive in installation due to long wavelength.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a simple structure, small can satisfy the slim omnidirectional antenna of ultralow frequency that indoor intercom send-receiver signal used.

In order to achieve the above object, the utility model provides a slim omnidirectional antenna of ultralow frequency, including PCB board, antenna radiator, matching resistance and feeder, antenna radiator, matching resistance set up the first face of PCB board, the antenna radiator includes two radiating element, matching resistance's one end with one of two radiating element electricity is connected, matching resistance's the other end with another one of two radiating element electricity is connected, the feeder electricity is connected two radiating element.

In some embodiments, the antenna radiator is copper metal printed on the first side of the PCB board.

In some embodiments, each of the radiation units includes a main body portion, the main body portion has a tapered profile, the tapered tips of the main body portions of the two radiation units are disposed close to and opposite to each other, and the main body portions of the two radiation units are disposed symmetrically with respect to the first symmetry axis.

In some embodiments, the body portion is formed by two radiating arms connected and symmetrically disposed about a second axis of symmetry perpendicular to the first axis of symmetry.

In some embodiments, the radiating element further includes two extension arms, each of the extension arms is connected to one of the radiating arms, so as to widen a frequency bandwidth of the radiating element.

In some embodiments, the extension arm includes a first arm segment connected to the radiating arm, a second arm segment connected to the first arm segment, and a third arm segment connected to the second arm segment, the first arm segment and the third arm segment extend along a first direction, the first arm segment and the third arm segment are disposed on the same side of the second arm segment, the second arm segment extends along a second direction, and the first direction is perpendicular to the second direction.

In some embodiments, the matching resistor has a resistance of 50 ohms.

In some embodiments, the feed line is a coaxial cable, the outer conductor of the feed line electrically connects one of the two radiating elements, and the inner conductor of the feed line electrically connects the other of the two radiating elements.

In some embodiments, the first side of the PCB board is covered with a layer of lacquer.

In some embodiments, the ultra-low frequency thin omni-directional antenna further includes a protective cover, where the protective cover includes a first cover and a second cover, the first cover covers an area of the first surface of the PCB board corresponding to the feeding portion, the second cover covers an area of the second surface of the PCB board corresponding to the feeding portion, and the second surface and the first surface of the PCB board are two opposite surfaces.

Compared with the prior art, the utility model is provided with the PCB board, and the antenna radiator is arranged on the first surface of the PCB board, so that the whole antenna has smaller volume, thin thickness, convenient installation, beautiful appearance and good concealment; meanwhile, the matching resistor is arranged, two ends of the matching resistor are respectively and electrically connected with one radiating unit of the antenna radiator, the impedance matching of the antenna, particularly the impedance matching of the 132MHz-174MHz frequency band, is adjusted through the matching resistor, the standing-wave ratio can be greatly improved, and the requirement that the standing-wave ratio is less than 1.8 can be met. Furthermore, the utility model has the advantages of simple structure, stability, easily processing.

Drawings

Fig. 1 is a perspective structural view of an ultra-low frequency thin omnidirectional antenna according to an embodiment of the present invention.

Fig. 2 is another angle of the ultra low frequency thin omni directional antenna shown in fig. 1

Fig. 3 is a structural diagram of the ultra-low frequency thin omni-directional antenna shown in fig. 1 without a protective cover.

Fig. 4 is a standing wave ratio graph of the ultra low frequency thin omni directional antenna shown in fig. 1.

Detailed Description

In order to explain technical contents and structural features of the present invention in detail, the following description is made with reference to the embodiments and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the present invention and are not intended to limit the invention to the particular embodiments described herein. All other embodiments, which can be derived by a person skilled in the art from the described embodiments without inventive step, are intended to be within the scope of the present invention.

In the description of the present invention, it should be understood that the terms "horizontal", "vertical", "up", "down", "left", "right", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and thus, are not to be construed as limiting the protection of the present invention.

The following detailed description of the ultra-low frequency thin omnidirectional antenna 100 of the present invention will be made by taking a specific embodiment as an example and referring to the drawings:

referring to fig. 1 to 3, an embodiment of the present invention provides an ultra-low frequency thin omnidirectional antenna 100, which includes a PCB board 1, an antenna radiator, a matching resistor 3, and a feeder 4, wherein the PCB board 1 has a first surface and a second surface that are arranged oppositely, and the antenna radiator and the matching resistor 3 are arranged on the first surface of the PCB board 1; the antenna radiator comprises two radiation units 2, the resistance value of the matching resistor 3 is matched with the impedance information of the antenna radiator, one end of the matching resistor 3 is electrically connected with one of the two radiation units 2, the other end of the matching resistor 3 is electrically connected with the other of the two radiation units 2, and the feeder line 4 is electrically connected with the two radiation units 2 of the antenna radiator.

In one embodiment the antenna radiator is metallic copper printed on the first side of the PCB board 1. Of course, the specific implementation is not limited thereto.

In one embodiment, the dimensions of the PCB board 1 are 385mm long, 358mm wide and 1.5mm thick, and the whole antenna 100 is small and easy to manufacture and install.

In one embodiment, each radiation unit 2 includes a main body portion, the contour of the main body portion is a cone shape, the cone tips of the main body portions of the two radiation units 2 are close to each other and are oppositely arranged in the longitudinal direction (i.e. the up-down direction, taking the angle shown in fig. 1 and 3 as an example), the main body portions of the two radiation units 2 are symmetrically arranged about a first symmetry axis, and the first symmetry axis is an axis extending in the transverse direction (i.e. the left-right direction, taking the angle shown in fig. 1 and 3 as an example). One end of the matching resistor 3 is electrically connected with the tapered tip of one of the main body parts, and the other end of the matching resistor 3 is electrically connected with the tapered tip of the other one of the main body parts.

Further, the body portion is formed by two radiating arms 21, the two radiating arms 21 are connected and symmetrically arranged about a second symmetry axis, which is perpendicular to the first symmetry axis, that is, the second symmetry axis is an axis extending in the longitudinal direction.

As shown in fig. 3, in one embodiment, each radiating element 2 further includes two extension arms 22, and each extension arm 22 is connected to one radiating arm 21, so as to widen the frequency bandwidth of the radiating element 2, thereby achieving ultra-low frequency coverage.

In one embodiment, the extension arm 22 includes a first arm segment 221 connected to the radiating arm 21, a second arm segment 222 connected to the first arm segment 221, and a third arm segment 223 connected to the second arm segment 222, the first arm segment 221 and the third arm segment 223 extending in a first direction, the second arm segment 222 extending in a second direction, the first direction being perpendicular to the second direction. In the embodiment shown in fig. 1 and 3, the first arm section 221 and the third arm section 223 extend in the longitudinal direction, the second arm section 222 extends in the transverse direction, the size of the first arm section 221 is smaller than that of the third arm section 223, and the first arm section 221 and the third arm section 223 are disposed on the same side of the second arm section 222, taking the angle shown in fig. 1 and 3 as an example, that is, the first arm section 221 and the third arm section 223 are disposed on the upper side of the second arm section 222. Wherein the extension arm 22 of one radiation unit 2 surrounds the partial structure outside of the extension arm 22 of the other radiation unit 2.

In one embodiment, the resistance value of the matching resistor 3 is 50 ohms, so that a better impedance matching effect is achieved in a frequency band of 132MHz-174MHz, the standing wave ratio of the frequency band is greatly improved, and the requirement that the standing wave ratio is less than 1.8 can be met. Of course, in some embodiments, the resistance of the matching resistor 3 may also be, for example, 100 ohms or the like.

As shown in fig. 3, in one embodiment, the feeding line 4 is a coaxial cable, the outer conductor of the feeding line 4 is electrically connected to one of the two radiating elements 2, the inner conductor of the feeding line 4 is electrically connected to the other of the two radiating elements 2, so as to realize the feeding function of the antenna, and the end of the feeding line 4, which is not connected to the radiating element 2, is provided with a coaxial connector 5. Specifically, the outer conductor and the inner conductor of the feeder 4 are connected with the corresponding radiating units 2 through welding, and the structure is stable and the performance is reliable.

In one embodiment, the first surface of the PCB board 1 is covered with a paint layer, the PCB board 1 is protected by the paint layer, and the antenna 100 can be directly installed on a ceiling for use without using an antenna housing, thereby reducing the production cost.

In one embodiment, the ultra low frequency thin omni directional antenna 100 further includes a protective cover, as shown in fig. 1 and 2, the protective cover includes a first cover 61 and a second cover 62, the first cover 61 covers an area of the first surface of the PCB board 1 corresponding to the power feeding portion, and the second cover 62 covers an area of the second surface of the PCB board 1 corresponding to the power feeding portion. The feed position of the antenna 100 is protected by the protective cover, and the feed of the antenna 100 is prevented from leaking, so that the feed of the antenna 100 is protected from being influenced by the external environment, the normal use of the antenna 100 is further ensured, and meanwhile, the antenna 100 is more attractive. In one embodiment, the first cover 61 and the second cover 62 are fixed on the PCB board 1 by screws 7, which is stable and reliable, but in other embodiments, the first cover 61 and the second cover 62 may be fixed in other manners.

Referring to fig. 4, fig. 4 shows the standing wave ratio curve of the ultra-low frequency thin omnidirectional antenna 100 of the present invention, as shown in fig. 4, the antenna frequency covers the frequency band of 132MHz-960MHz, and the standing wave ratio is less than 1.8 at the frequency band of 132MHz-174MHz, the frequency band of 380MHz-520MHz and the frequency band of 600MHz-960MHz, so as to satisfy the communication requirements of the indoor interphone for transmitting and receiving signals and the frequency band of 600MHz-960 MHz.

In summary, the utility model has the advantages that by arranging the PCB board 1 and arranging the antenna radiator on the first surface of the PCB board 1, the whole antenna 100 has small volume, thin thickness, convenient installation, beautiful appearance and good concealment; meanwhile, the matching resistor 3 is arranged, two ends of the matching resistor 3 are respectively and electrically connected with one of the radiating units 2 of the antenna radiator, the impedance matching of the antenna 100, especially the impedance matching of the frequency band of 132MHz-174MHz, is adjusted through the matching resistor 3, the standing-wave ratio can be greatly improved, and the requirement that the standing-wave ratio is less than 1.8 can be met. Furthermore, the utility model discloses a constitute spare part few, simple structure, stability, easily processing, and the solder joint is few, and welding quality is controllable.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, therefore, the present invention is not limited by the appended claims.

Claims

1. The ultra-low frequency thin omnidirectional antenna is characterized by comprising a PCB (printed circuit board), an antenna radiator, a matching resistor and a feeder line, wherein the antenna radiator and the matching resistor are arranged on a first surface of the PCB, the antenna radiator comprises two radiation units, one end of the matching resistor is electrically connected with one of the two radiation units, the other end of the matching resistor is electrically connected with the other of the two radiation units, and the feeder line is electrically connected with the two radiation units.

2. The ultra low frequency thin omni directional antenna according to claim 1, wherein the antenna radiator is metal copper printed on the first surface of the PCB board.

3. The ultra low frequency thin omni directional antenna according to claim 1, wherein each of the radiating elements comprises a main body portion, the main body portion has a tapered shape, tapered tips of the main body portions of the two radiating elements are disposed close to and opposite to each other, and the main body portions of the two radiating elements are disposed symmetrically with respect to the first axis of symmetry.

4. The ultra low frequency thin omni directional antenna according to claim 3, wherein the body part is formed of two radiation arms connected and symmetrically disposed about a second axis of symmetry, the second axis of symmetry being perpendicular to the first axis of symmetry.

5. The ultra low frequency thin omni directional antenna according to claim 4, wherein the radiating element further comprises two extension arms, each of which is connected to one of the radiating arms, to widen a frequency bandwidth of the radiating element.

6. The ultra low frequency thin omni directional antenna according to claim 5, wherein the extension arm comprises a first arm segment connected to the radiating arm, a second arm segment connected to the first arm segment, and a third arm segment connected to the second arm segment, wherein the first and third arm segments extend in a first direction, the first and third arm segments are disposed at the same side of the second arm segment, and the second arm segment extends in a second direction, and the first direction is perpendicular to the second direction.

7. The ultra low frequency thin omni directional antenna according to claim 1, wherein the matching resistor has a resistance of 50 ohms.

8. The ultra low frequency thin omni directional antenna according to claim 1, wherein the feeder is a coaxial cable, an outer conductor of the feeder electrically connects one of the two radiating elements, and an inner conductor of the feeder electrically connects the other of the two radiating elements.

9. The ultra low frequency thin omni directional antenna as claimed in claim 1, wherein the first surface of the PCB board is coated with a paint layer.

10. The ultra-low frequency thin omni directional antenna according to claim 1, further comprising a protective cover, wherein the protective cover comprises a first cover and a second cover, the first cover covers a region of the first surface of the PCB corresponding to the power feeding portion, the second cover covers a region of the second surface of the PCB corresponding to the power feeding portion, and the second surface and the first surface of the PCB are opposite to each other.