A sub-1g 861-941 mhz external antenna

Abstract

The application discloses a SUB-1G 861-941 MHZ external antenna, which comprises an SMA head, an upper fixing part, a shielding wire, a lower fixing part, a copper pipe, a spring and a PCB; the SMA head is externally provided with a copper needle, the SMA head is screw-connected to the lower fixing part, and the upper fixing part is arranged on the rotating lower fixing part; the copper needle is welded to the shielding wire, the shielding wire is inserted into the SMA head for welding; the PCB is fixed to the upper fixing part, the other end of the shielding wire is welded to the PCB, and the spring is welded to the PCB; the slot end of the copper pipe is inserted into the PCB, so that the PCB is in contact with the copper pipe and grounded, and the copper pipe and the PCB are connected into a grounding whole; and the sleeve rod is sleeved on the upper fixing part. The application has the advantages of low power consumption, long-distance transmission and strong anti-interference capability, and meets the demand for high signal performance of electronic equipment generated by the rapid development of the loT market in recent years.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, and particularly relates to a SUB-1G external antenna. BACKGROUND

[0002] In recent years, the Internet of Things (IoT) market continues to grow rapidly, and various electronic devices are designed like mushrooms after rain, at the same time, in response to market demand trends, more and more electronic devices need to be connected to cloud servers. Home automation and other applications can enable you to install lighting, heating and alarm systems to open lights, set temperatures and receive alarm notifications from mobile devices. With the emergence of many different wireless connection technologies, it is possible to connect low-power devices to the cloud. The problem often becomes which wireless technology should be chosen for your application.

[0003] Sub-1 GHz band communication has unique performance to provide the longest connection distance, the lowest overall connection reliability. There is obvious advantage in the Internet of Things market which is developing rapidly.

[0004] Sub 1G (refers to the communication frequency below 1GHz, 27MHz-960MHz) has the advantages of long transmission distance, low power consumption, and strong anti-interference (strong wall penetration ability and weak attenuation). Sub 1G has three frequency bands: 433MHz, 868MHz, and 915MHz.

[0005] Sub-GHz is an ideal choice for long-range and low-power communication. Wireless propagation is inversely proportional to frequency, and sub-GHz radio frequency has more advantages in low-power, long-range communication or wall penetration capability. For many applications, 433MHz has become a global alternative to 2.4GHz (but Japan does not allow it to be used for wireless applications). Designs based on 868MHz and 915MHz can be used in the American and European markets. There are many available unlicensed or licensed frequency bands, and for system integrators, they can choose to optimize performance in certain areas or work with utility companies to design systems in a wide area. In this diversification, compared with 2.4GHz frequency band, sub-GHz frequency band has less spectrum interference. Less interference in the frequency band can improve the overall performance of the network and reduce the number of retransmissions in transmission. Sub-1GHz is also an important field of wireless communication, and its applications cover consumer electronics, automobiles, industries, and medical care. For example, TV / STB / VCR / DVD / audio device remote control, high-end wireless toys, garage door remote control switch, lighting control, door remote control switch, wireless POS machine, wireless health monitor, wearable monitoring device, etc. The application is very wide. SUMMARY

[0006] The technical problem to be solved by the present invention is to provide a SUB-1G 861-941MHz external antenna to solve the problems existing in the background art.

[0007] The SUB-1G 861-941MHz external antenna of this invention is achieved through the following technical solution: including an SMA connector, an upper fixing component, a shielding wire, a lower fixing component, a copper tube, a spring, and a PCB;

[0008] The SMA connector is equipped with copper pins. The SMA connector is threaded onto the lower fixing component, and the upper fixing component is mounted on the rotating lower fixing component. The copper pins are soldered to the shielding wire, which is then inserted into the SMA connector for soldering. The PCB board is fixed to the upper fixing component, and the other end of the shielding wire is soldered to the PCB. A spring is soldered onto the PCB. The slotted end of the copper tube is inserted into the PCB, making the PCB and the copper tube contact and ground, forming a grounding unit. A sleeve rod is fitted onto the upper fixing component.

[0009] As a preferred technical solution, the SMA connector is a small S-shaped male pin with an opening of 2.55mm. In addition, the SMA connector is equipped with copper pins on the outside. The copper pins are soldered to the shielded wire, which is inserted into the SMA connector and then soldered again for use.

[0010] As a preferred technical solution, the shielding wire is RG178 wire, which includes a wire core, an insulation layer, a braided layer, and an outer sheath. The total length of the shielding wire is 60mm. One end is stripped of 5.2.2mm wire, and the other end is stripped of 2.2.1.5mm wire. Copper pins are soldered to the wire core at the 5.2.2mm stripped end of the shielding wire. Then, the wire core with copper pins at the 5.2.2mm stripped end of the shielding wire is inserted into the hole of the SMA connector. The braided layer of the shielding wire is then soldered firmly to the hole of the SMA connector. The 2.2.1.5mm stripped end of the shielding wire is then soldered to the PCB.

[0011] As a preferred technical solution, the PCB is single-sided and 0.2mm thick. The PCB circuit has two parts: the left side is the radial circuit and the right side is the grounding circuit. The radial circuit of the PCB has a pad for soldering the core of the shielding wire. The grounding circuit has a second, third, fourth and fifth pad, which are copper-plated planes. The third pad is for soldering the braided layer of the shielding wire, the second pad is for soldering the slot areas on both sides of the copper tube, and the fourth pad is for soldering the spring.

[0012] As a preferred technical solution, the copper tube is made of brass and has slots on both sides of the upper part. When in use, the copper tube is inserted into the upper fixing part with the slotted end of the copper tube facing up, and then inserted into the PCB. The second pad of the PCB corresponds to the slots on both sides of the copper tube and is soldered to make the second pad and the copper tube make contact with each other and grounded, forming a grounded whole.

[0013] As a preferred technical solution, the spring is made of brass and has 8 coils.

[0014] The beneficial effects of this invention are:

[0015] 1. With its advantages of low power consumption, long-distance transmission capability, and strong anti-interference ability, this invention meets the demand for high signal performance of electronic devices generated by the rapid development of the Internet of Things (IoT) market in recent years.

[0016] 2. Given that the SUB-1G's frequency range is 27MHz-960MHz, and its three commonly used frequency bands are 433MHz, 868MHz, and 915MHz, it is difficult for a physical antenna to encompass a bandwidth of 27MHz-960MHz. Therefore, the new antenna can only be designed with a bandwidth of 861MHz-941MHz, accommodating both the 868MHz and 915MHz frequency bands. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 and Figure 2 This is a structural diagram of the present invention;

[0019] Figure 3 This is an overall diagram of the internal components of the present invention;

[0020] Figure 4 and Figure 5 This is the main view of the SMA head of the present invention;

[0021] Figure 6 This is a front view of the coaxial cable of the present invention;

[0022] Figure 7 This is a front view of the PCB board of the present invention;

[0023] Figure 8 This is a front view of the copper tube of the present invention;

[0024] Figure 9 This is a front view of the spring of the present invention;

[0025] Figure 10 This is the RL free space test diagram of the present invention;

[0026] Figure 11 This is a free-space test diagram of the VSWR of the present invention;

[0027] Figure 12This is a Smith free-space test diagram for the present invention;

[0028] Figure 13 Screenshots showing the efficiency and gain of this invention;

[0029] Figure 14 This invention provides a 3D radiation pattern for 860MHz and 2D radiation patterns for the XY, ZX, and YZ planes.

[0030] Figure 15 This invention provides a 3D radiation pattern for 900MHz and 2D radiation patterns for the XY, ZX, and YZ planes.

[0031] Figure 16 This invention provides a 3D radiation pattern for 940MHz and 2D radiation patterns for the XY, ZX, and YZ planes. Detailed Implementation

[0032] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0033] like Figure 1 — Figure 14 As shown, a SUB-1G 861-941MHz external antenna of the present invention includes an SMA connector 1, an upper fixing component 2, a shielding wire 3, a lower fixing component 4, a copper tube 5, a spring 6, and a PCB 7.

[0034] The SMA head 1 is equipped with a copper pin. The SMA head 1 is threaded to the lower fixing part 4, and the upper fixing part 2 is set on the rotating lower fixing part 4. The copper pin is soldered to the shielding wire 3, and the shielding wire 3 is inserted into the SMA head 1 for soldering. The PCB board 7 is fixed to the upper fixing part 2, and the other end of the shielding wire 3 is soldered to the PCB 7. A spring 6 is soldered on the PCB 7. The slot end of the copper tube 5 is inserted into the PCB 7, so that the PCB 7 and the copper tube 5 are in contact with grounding and connected to form a grounding whole. A sleeve rod 8 is sleeved on the upper fixing part 2.

[0035] In this embodiment, the SMA head 1 is an internal screw head with a small S-shaped male pin with an opening of 2.55mm. In addition, the SMA head 1 is equipped with copper pins on its exterior. The copper pins are soldered to the shielding wire 3, which is inserted into the SMA head 1 and then soldered again for use.

[0036] In this embodiment, the shielding wire 3 is an RG178 wire, which includes a wire core, an insulation layer, a braided layer, and an outer sheath. The total length of the shielding wire is 60mm. One end is stripped of 5, 2, 2mm, and the other end is stripped of 2, 2, 1.5mm. Copper pins are soldered to the wire core at the 5, 2, 2mm stripped end of the shielding wire. Then, the wire core with copper pins at the 5, 2, 2mm stripped end of the shielding wire is inserted into the hole of the SMA connector 1. The braided layer of the shielding wire 3 is then soldered firmly to the hole of the SMA connector 1. Alternatively, a riveting process can be used to connect and fix the braided layer of the wire to the opening of the SMA connector 1. In this invention, a soldering process is used. The 2, 2, 1.5mm stripped end of the shielding wire 3 is soldered to the PCB 7.

[0037] In this embodiment, PCB7 is a single-sided wiring circuit with a thickness of 0.2mm. The circuit of PCB7 has two parts: the left side is the radial circuit 13 and the right side is the grounding circuit. The radial circuit 13 of PCB7 has a pad 14, which is used to solder the core of the shielding wire 3. The grounding circuit is provided with a second pad 9, a third pad 10, a fourth pad 11 and a fifth pad 12, which are copper-filled planes. The third pad 10 is used to solder the braided layer of the shielding wire 3, the second pad 9 is used to solder the slot areas on both sides of the copper tube 5, and the fourth pad 11 is used to solder the spring 6.

[0038] In this embodiment, the copper tube 5 is made of brass, cylindrical, with a total length of 22mm, an outer diameter of 4.9mm, and an inner diameter of 4.5mm. The upper two sides of the copper tube 5 have slots with a width of 1mm and a depth of 2mm. When in use, the copper tube 5 is inserted into the upper fixing part 2 with the slotted end of the copper tube 5 facing up, and is inserted into the PCB 7. The second solder pads 9 of the PCB 7 correspond to the slots on both sides of the copper tube 5 and are soldered to make the second solder pads 9 and the copper tube 5 make solder contact and grounding, forming a grounded whole.

[0039] In this embodiment, the spring is made of brass, with a total length of 14mm, a wire diameter of 0.5mm, and an overall outer diameter of 5mm; it has 8 turns; the spring is soldered onto the fourth pad 11 of the PCB circuit board; the spring, PCB, and copper tube are connected by a shielding wire to form an antenna radiation carrier, which effectively realizes the antenna performance of the 861-941MHz frequency band in SUB-1G.

[0040] The external adhesive rod antenna of this invention has a total length of 115mm when fully extended and a total length of 95mm when bent. This is a length dimension widely used in the market. This invention achieves optimal performance efficiency gain over the entire length of this adhesive shell.

[0041] The matching of the circuit configuration of the PCB board, the length and number of coils of the spring, and related parameter specifications, especially the unique combination and construction of the spring, PCB board, and copper tube, are the core of the antenna of this invention.

[0042] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions conceived without inventive effort should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A SUB-1G 861-941MHz external antenna, characterized in that: The device includes an SMA head (1), an upper fixing member (2), a shielding wire (3), a lower fixing member (4), a copper tube (5), a spring (6), and a PCB (7). The SMA head (1) is equipped with a copper pin, and the SMA head (1) is connected to the lower fixing member (4). The upper fixing member (2) is mounted on the rotating lower fixing member (4). The copper pin is fixed to the shielding wire (3), and the shielding wire (3) is inserted into the SMA head (1) for fixation. The PCB (7) is fixed to the upper fixing member (2), and the other end of the shielding wire (3) is fixed to the PCB (7). The spring (6) is fixed on the PCB (7). The slot end of the copper tube (5) is inserted into the PCB (7), so that the PCB (7) and the copper tube (5) are in contact with ground and connected to form a grounded whole. The SMA head (1) is equipped with copper pins on its outer surface. The copper pins are soldered onto the shielding wire (3), and the shielding wire (3) is inserted into the SMA head (1) for soldering. The shielding wire (3) is an RG178 wire. The shielding wire (3) includes a wire core, an insulation layer, a braided layer, and an outer sheath. The shielding wire (3) is stripped at both ends. A copper needle is welded to the stripped wire core at one end of the shielding wire. The stripped wire core with the copper needle is inserted into the hole of the SMA head (1) and welded. The braided layer of the shielding wire (3) is fixed to the hole of the SMA head (1). The wire core at the other stripped end of the shielding wire (3) is welded to the PCB (7). The PCB (7) is a single-sided wiring, and the circuit of the PCB (7) has two parts: the left side is the radiating circuit (13) and the right side is the grounding circuit; the radiating circuit (13) of the PCB (7) has a pad (14) for soldering the core of the shielding wire (3). The grounding line is provided with a second pad (9), a third pad (10), a fourth pad (11) and a fifth pad (12), which are copper-laying planes; the third pad (10) is used to weld the braided layer of the shielding wire (3), the second pad (9) is used to weld the slot areas on both sides of the copper tube (5), and the fourth pad (11) is used to weld the spring (6). The copper tube (5) is made of brass and has slots on both sides of the upper part. When in use, the copper tube (5) is inserted into the upper fixing part (2), with the slot end of the copper tube (5) at the top and inserted into the PCB (7). The second pad (9) of the PCB (7) corresponds to the slots on both sides of the copper tube (5) and is soldered to make the second pad (9) and the copper tube (5) soldered to ground and connected to form a grounded whole; The spring is made of brass and has 8 coils. A sleeve rod (8) is fitted onto the upper fixing member (2); The SMA head (1) is threaded onto the lower fixing member (4).

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