A combined antenna used in a roadside unit

Abstract

The present invention relates to the field of antenna technology, and provides a combined antenna applied to a roadside unit, including a transceiver device, a positioning antenna, a first antenna, and a second antenna. Compared with the prior art, the combined antenna applied to the roadside unit provided by the present invention can not only reduce costs and expand the bandwidth of the antenna frequency band by synthesizing the 2.4-2.483GHz frequency band and the 4.910-5.875GHz frequency band in the first antenna, thereby realizing the multi-frequency and broadband characteristics of the frequency band, but also avoid the problem in the prior art that the 2.4GHz frequency band antenna and the 5GHz frequency band antenna are arranged at the upper and lower ends of the transceiver device to affect the performance indicators of the antenna; by setting the frequency range of the second antenna to 698-3800MHz, the frequency range of the second antenna can cover the 5G frequency band, so that the application range of the combined antenna is wider.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and more specifically, to a combined antenna used in a roadside unit. Background Art

[0002] RSU is the abbreviation of Road Side Unit, which is an ETC system (Electronic Toll Collection) installed on the roadside. It uses DSRC (Dedicated Short Range Communication) technology to communicate with the on-board unit to realize vehicle identity recognition and electronic point deduction. In highway and parking lot management, installing RSU on the roadside can establish unmanned fast dedicated channels, and can also provide high-precision vehicle positioning, high-precision maps and other services. Through the above communication exchanges, a safer and more convenient smart transportation world can be achieved.

[0003] At present, most of the combined antennas, WLAN and WIFI fiberglass omnidirectional antennas used in roadside units on the market use 2.4GHz frequency band antennas and 5GHz frequency band antennas separately, which not only increases the cost, but also the antennas are installed at the upper and lower ends of the transceiver equipment. Since the fiberglass omnidirectional antenna installed at the lower end of the transceiver equipment faces the ground and the height of the equipment from the ground is not high, this installation has a certain impact on the performance indicators of the antenna; the frequency range of the wide-band fiberglass omnidirectional antenna only covers the 4G (fourth-generation mobile communication system) frequency range, which is 698-2700MHz, and lacks the 5G (fifth-generation mobile communication system) frequency band of 3300-3800MHz, and cannot be expanded. Summary of the invention

[0004] The purpose of the present invention is to provide a combined antenna for use in a roadside unit to solve the technical problems that the 2.4 GHz band antenna and the 5 GHz band antenna in the existing combined antenna are made separately, which increases the cost and lacks the 5G band.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a combined antenna applied to a roadside unit, including a transceiver device and the following antennas arranged on the same side of the transceiver device: a positioning antenna; a first antenna, the internal structure of the first antenna includes a first line unit and a second line unit connected to each other, the first line unit operates in the 2.4-2.483GHz frequency band, and the second line unit has a frequency range of 4.910-5.875GHz frequency band; and, a second antenna, which operates in the 698-3800MHz frequency band.

[0006] Furthermore, the second antenna includes an external structure and an internal structure, the external structure of the second antenna includes a second fiberglass cap, a second fiberglass outer cover, a second aluminum sleeve and a second joint, the second fiberglass cap and the second aluminum sleeve are connected at both ends of the second fiberglass outer cover, and the second aluminum sleeve is arranged on the second joint; the internal structure of the second antenna includes a second connecting cable and a first printed circuit board, the first printed circuit board is a single-sided printed circuit board; a feeding point, a grounding point, a radiating oscillator and a coupling oscillator are provided on the first printed circuit board; a transmission line is provided at the bottom of the coupling oscillator; the first end of the second joint is connected to the transceiver device, and the second end of the second joint is welded to the first end of the second connecting cable; the inner conductor of the second end of the second connecting cable is welded to the feeding point, and the outer conductor of the second end of the second connecting cable is welded to the grounding point.

[0007] Furthermore, the top of the radiation vibrator is fan-shaped, and the transmission line is a wavy transmission line.

[0008] Furthermore, the first printed circuit board has a length of 105 mm-120 mm, a width of 13.2 mm-14.2 mm, and a thickness of 0.40 mm-0.80 mm.

[0009] Furthermore, the internal structure of the first antenna also includes a second printed circuit board and a connecting unit, and the first line unit, the second line unit and the connecting unit are all arranged on the second printed circuit board; the connecting unit is located between the first line unit and the second line unit, and is used to connect the first line unit and the second line unit.

[0010] Furthermore, the second printed circuit board is a double-sided printed circuit board, comprising a first surface board and a second surface board opposite to the first surface board; the first line unit comprises a first 2.4 GHz frequency band impedance transformation section, a second 2.4 GHz frequency band impedance transformation section and a 2.4 GHz frequency band radiation vibrator; the first 2.4 GHz frequency band impedance transformation section is arranged on the first surface board; the second 2.4 GHz frequency band impedance transformation section is arranged on the second surface board; the 2.4 GHz frequency band radiation vibrator is arranged on the first surface board and the second surface board; the first 2.4 GHz frequency band impedance transformation section and the second 2.4 GHz frequency band impedance transformation section are both connected to the 2.4 GHz frequency band radiation vibrator feeding; the second line unit comprises a first 5 GHz frequency band impedance transformation section, a second 5 GHz frequency band impedance transformation section and a 5 GHz band radiating vibrator; the first 5GHz band impedance transformation section is arranged on the first surface plate; the second 5GHz band impedance transformation section is arranged on the second surface plate; the 5GHz band radiating vibrator is arranged on the first surface plate and the second surface plate; the first 5GHz band impedance transformation section and the second 5GHz band impedance transformation section are both fed and connected with the 5GHz band radiating vibrator; the connecting unit includes a frequency division and integration circuit arranged on the first surface plate and a ground welding plate arranged on the second surface plate; wherein, on the first surface plate, the 2.4GHz band radiating vibrator and the 5GHz band radiating vibrator are fed and connected via the frequency division and integration circuit; on the second surface plate, the 2.4GHz band radiating vibrator and the 5GHz band radiating vibrator are fed and connected via the ground welding plate.

[0011] Furthermore, a first open circuit, a second open circuit and an impedance matcher are provided on the frequency division and combined line; the first open circuit is provided at one end of the frequency division and combined line close to the 2.4 GHz frequency band radiating oscillator; the second open circuit and the impedance matcher are provided at one end of the frequency division and combined line close to the 5 GHz frequency band radiating oscillator.

[0012] Furthermore, the first open circuit breaker, the second open circuit breaker and the impedance matcher are all irregularly shaped.

[0013] Furthermore, a cable core wire hole is provided on the ground welding plate, a cable core wire hole is provided on the ground welding plate, the external structure of the first antenna includes a first fiberglass cap, a first fiberglass outer cover, a first aluminum sleeve and a first joint, the first fiberglass cap and the first aluminum sleeve are connected at both ends of the first fiberglass outer cover, the first aluminum sleeve is provided on the first joint, and the internal structure of the first antenna also includes a first connecting cable; the first connecting cable includes a first end and a second end, the inner conductor of the first end passes through the cable core wire hole and is welded and connected at the feeder of the frequency division and integration circuit; the outer conductor of the first end is welded and connected on the ground welding plate; the second end is welded and fixed to one end of the first joint, and the other end of the first joint is connected to the transceiver device.

[0014] Furthermore, the positioning antenna includes an antenna cover and a third connector, and a ceramic sheet, a third printed circuit board, a mounting steel plate and a third connecting cable are arranged in the antenna cover; the mounting steel plate is fixed in the antenna cover, the ceramic sheet and the third printed circuit board are fixed on the mounting steel plate, the ceramic sheet and the third printed circuit board are welded and connected, one end of the third connecting cable is welded and connected to the third printed circuit board, the other end of the third connecting cable is welded and connected to one end of the third connector, and the other end of the third connector is connected to the transceiver device.

[0015] Compared with the prior art, the combined antenna applied to the roadside unit provided by the present invention can reduce costs and expand the bandwidth of the antenna frequency band, thereby realizing multi-frequency and broadband characteristics of the frequency band, by synthesizing the 2.4-2.483GHz frequency band and the 4.910-5.875GHz frequency band in the first antenna, while avoiding the problem in the prior art that the 2.4GHz frequency band antenna and the 5GHz frequency band antenna are arranged at the upper and lower ends of the transceiver equipment, thereby affecting the performance indicators of the antenna; by setting the frequency range of the second antenna to 698-3800MHz, the frequency range of the second antenna can cover the 5G (fifth-generation communication system) frequency band, so that the application range of the combined antenna is wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A schematic diagram of the structure of a combined antenna applied to a drive test unit provided in an embodiment of the present invention;

[0018] Figure 2 A schematic structural diagram of a first printed circuit board for a second antenna provided by an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of the structure of a second connector of a second antenna and a second connecting cable provided in an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of the front structure of the second printed circuit board of the first antenna provided by an embodiment of the present invention;

[0021] Figure 5 A schematic diagram of the back structure of the second printed circuit board of the first antenna provided by an embodiment of the present invention;

[0022] Figure 6 A schematic diagram of a first connector and a first connecting cable provided in an embodiment of the present invention;

[0023] Figure 7 A schematic diagram of the structure of a frequency division and integration circuit on a second printed circuit board provided by an embodiment of the present invention;

[0024] Figure 8 A schematic diagram of the structure of a positioning antenna provided in an embodiment of the present invention;

[0025] Fig. 9 A schematic structural diagram of a radome for a positioning antenna provided in an embodiment of the present invention;

[0026] Fig.10 A schematic diagram of the structure of a ceramic sheet of a positioning antenna provided in an embodiment of the present invention;

[0027] Fig.11 A schematic diagram of the structure of a steel plate for mounting a positioning antenna provided in an embodiment of the present invention;

[0028] Fig.12 A schematic structural diagram of a third connector and a third connecting cable provided in an embodiment of the present invention;

[0029] Fig.13 is a standing wave diagram actually measured by the first antenna in the embodiment;

[0030] Fig.14 is a standing wave diagram actually measured by the second antenna in the embodiment;

[0031] Fig.15 It is a standing wave diagram actually measured by the positioning antenna in the embodiment;

[0032] Fig.16 This is a signal strength test diagram actually measured by the positioning antenna in the embodiment;

[0033] Fig.17 for Figure 1The first antenna is tested at 2400MHz.

[0034] Fig.18 for Figure 1 The first antenna is tested at 2450MHz.

[0035] Fig.19 for Figure 1 The first antenna is tested at 2500MHz.

[0036] Fig. 20 for Figure 1 The first antenna is tested at 5150MHz.

[0037] Fig.21 for Figure 1 The first antenna is tested at 5500MHz.

[0038] Fig. 22 for Figure 1 The directional pattern of the first antenna tested at 5850MHz;

[0039] Fig.23 for Figure 1 The directional pattern of the second antenna tested at 824MHz;

[0040] Fig.24 for Figure 1 The directional pattern of the second antenna tested at 1710MHz;

[0041] Fig.25 for Figure 1 The directional pattern of the second antenna tested at 2170MHz;

[0042] Fig.26 for Figure 1 The directional pattern of the second antenna tested at 2300MHz;

[0043] Fig. 27 for Figure 1 The radiation pattern of the second antenna tested at 2500MHz;

[0044] Fig.28 for Figure 1 The radiation pattern of the second antenna tested at 2700MHz;

[0045] Fig.29 for Figure 1 The radiation pattern of the second antenna tested at 3600MHz;

[0046] Fig.30 A schematic diagram of the external structure of a second antenna provided by an embodiment of the present invention;

[0047] Fig.31A schematic diagram of the external structure of a first antenna provided in an embodiment of the present invention.

[0048] Among them, the reference numerals in the figure are:

[0049] 1-transceiver device; 2-first antenna; 21-first line unit; 211-first 2.4GHz frequency band impedance transformation section; 212-second 2.4GHz frequency band impedance transformation section; 213-2.4GHz frequency band radiation oscillator; 22-second line unit; 221-first 5GHz frequency band impedance transformation section; 222-second 5GHz frequency band impedance transformation section; 223-5GHz frequency band radiation oscillator; 23-second printed circuit board; 231-first surface board; 232-second surface board; 24-connection unit; 241-frequency division and integration circuit; 2411-first open circuit; 2412-second open circuit; 2413-impedance matching device; 2414-feeding point; 242-ground welding Plate; 2421-cable core hole; 25-first connecting cable; 251-first end; 252-second end; 26-first joint; 27-first glass fiber reinforced plastic cap; 28-first glass fiber reinforced plastic cover; 29-first aluminum sleeve; 3-second antenna; 31-second connecting cable; 32-second joint; 33-first printed circuit board; 331-feeding point; 332-grounding point; 333-radiating oscillator; 334-coupling oscillator; 335-transmission line; 34-second glass fiber reinforced plastic cap; 35-second glass fiber reinforced plastic cover; 36-second aluminum sleeve; 4-positioning antenna; 41-radome; 411-ceramic plate; 412-third printed circuit board; 413-installation steel plate; 414-third connecting cable; 42-third joint. DETAILED DESCRIPTION

[0050] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0051] See also Figure 1 , the combined antenna applied to the roadside unit provided by the present invention is now described. The combined antenna includes a transceiver device 1 and the following antennas arranged on the same side of the transceiver device 1: a positioning antenna 4; a first antenna 2, the internal structure of the first antenna 2 includes a first line unit 21 and a second line unit 22 connected to each other, the first line unit 21 operates in the 2.4-2.483GHz frequency band, and the second line unit 22 has a frequency range of 4.910-5.875GHz; and, a second antenna 3, which operates in the 698-3800MHz frequency band.

[0052] Compared with the prior art, the combined antenna provided by the present invention for use in a roadside unit can reduce costs and expand the bandwidth of the antenna frequency band, thereby realizing multi-frequency and broadband characteristics of the frequency band, by synthesizing the 2.4-2.483GHz frequency band and the 4.910-5.875GHz frequency band in the first antenna 2. At the same time, it can also avoid the problem in the prior art that the 2.4GHz frequency band antenna and the 5GHz frequency band antenna are arranged at the upper and lower ends of the transceiver device 1, thereby affecting the performance indicators of the antenna; by setting the frequency range of the second antenna 3 to 698-3800MHz, the frequency range of the second antenna 3 can cover the 5G (fifth-generation communication system) frequency band, so that the application range of the combined antenna is wider.

[0053] Further, see Figure 2 , Figure 3 and Fig.30 As a specific embodiment of the combined antenna applied to the roadside unit provided by the present invention, the external structure of the second antenna 3 includes a second fiberglass cap 34, a second fiberglass cover 35, a second aluminum sleeve 36 and a second joint, and the internal structure of the second antenna 3 includes a second connecting cable 31 and a first printed circuit board 33, and the first printed circuit board 33 is a single-sided printed circuit board; a feeding point 331, a grounding point 332, a radiation oscillator 333 and a coupling oscillator 334 are provided on the first printed circuit board 33; a transmission line 335 is provided at the bottom of the coupling oscillator 334; a first end of the second joint 32 is connected to the transceiver device 1, and a second end of the second joint 32 is welded to a first end of the second connecting cable 31; an inner conductor of the second end of the second connecting cable 31 is welded to the feeding point 331, and an outer conductor of the second end of the second connecting cable 31 is welded to the grounding point 332.

[0054] In a specific implementation, the second antenna 3 can be a fiberglass omnidirectional antenna, and the length of the radiation element 333 of the second antenna 3 is 1 / 4λ0, wherein λ0 is the spatial free wavelength of the center frequency, and the radiation element 333 of the second antenna 3 becomes a half-wave radiation element of the antenna after two adjacent groups of elements are fed.

[0055] Furthermore, as a specific embodiment of the combined antenna applied to the roadside unit provided by the present invention, the top of the radiation oscillator 333 is fan-shaped, and the transmission line 335 is a wavy transmission line. Such a design can make the electrical length from the feeding point 331 to each top gradually change, which is equivalent to the upper part of the radiation oscillator 333 of the second antenna 3 connected with different smooth transition sections, so that the current reflection along the antenna surface is very small, thereby effectively widening the impedance and bandwidth, and realizing the broadband characteristics of the antenna; at the same time, it also plays a role of coupled resonance in impedance matching, forming low standing wave and broadband characteristics, and can achieve perfect electrical performance indicators in a limited space and volume.

[0056] Further, as a specific implementation of the combined antenna applied to the roadside unit provided by the present invention, the length of the first printed circuit board 33 is 105mm-120mm, the width is 13.2mm-14.2mm, and the thickness is 0.40mm-0.80mm. In specific implementation, the first printed circuit board 33 can be a FR4 single-sided copper-clad PCB board with a dielectric constant of 4.3-4.7.

[0057] Further, see Figure 4 and Figure 5 As a specific embodiment of the combined antenna applied to the roadside unit provided by the present invention, the internal structure of the first antenna 2 also includes a second printed circuit board 23 and a connecting unit 24. The first line unit 21, the second line unit 22 and the connecting unit 24 are all arranged on the second printed circuit board 23; the connecting unit 24 is located between the first line unit 21 and the second line unit 22, and is used to connect the first line unit 21 and the second line unit 22. By arranging the first line unit 21 and the second line unit 22 on the second printed circuit board 23 and connecting them through the connecting unit 24, the 2.4 GHz frequency band and the 5 GHz frequency band can be synthesized in the first antenna 2.

[0058] Further, as a specific embodiment of the combined antenna applied to the roadside unit provided by the present invention, the second printed circuit board 23 is a double-sided printed circuit board, including a first surface plate 231 and a second surface plate 232 opposite to the first surface plate 231; the first circuit unit 21 includes a first 2.4 GHz band impedance transformation section 211, a second 2.4 GHz band impedance transformation section 212 and a 2.4 GHz band radiation oscillator 213; the first 2.4 GHz band impedance transformation section 211 is arranged on the first surface plate 231; the second 2.4 GHz band impedance transformation section 212 is arranged on the second surface plate 232; the 2.4 GHz band radiation oscillator 213 is arranged on the first surface plate 231 and the second surface plate 232; the first 2.4 GHz band impedance transformation section 211 and the second 2.4 GHz band impedance transformation section 212 are both connected to the 2.4 GHz band radiation oscillator 213 for feeding; the second circuit unit 22 includes a first 5 GHz band impedance transformation section 221, a second 5 GHz band impedance transformation section 222 and 5 GHz band radiation oscillator 223; the first 5 GHz band impedance transformation section 221 is arranged on the first surface plate 231; the second 5 GHz band impedance transformation section 222 is arranged on the second surface plate 232; the 5 GHz band radiation oscillator 223 is arranged on the first surface plate 231 and the second surface plate 232; the first 5 GHz band impedance transformation section 221 and the second 5 GHz band impedance transformation section 222 are both fed with the 5 GHz band radiation oscillator 223 Electrical connection; the connecting unit 24 includes a frequency division and integration circuit 241 arranged on the first surface plate 231 and a ground welding plate 242 arranged on the second surface plate 232; wherein, on the first surface plate 231, the 2.4 GHz band radiation vibrator 213 and the 5 GHz band radiation vibrator 223 are fed and connected via the frequency division and integration circuit 241; and on the second surface plate 232, the 2.4 GHz band radiation vibrator 213 and the 5 GHz band radiation vibrator 223 are fed and connected via the ground welding plate 242.

[0059] In a specific implementation, the double-sided printed circuit board can be a high-frequency double-sided copper-clad PCB board, whose length is 375mm-397mm, width is 13.2mm-15.2mm, and thickness is 0.80mm-1.20mm. The material of the high-frequency double-sided copper-clad PCB board is F4BM-2 double-sided copper-clad board with a dielectric constant of 2.2; the welding grounding plate is in a convex shape, whose length is 62.3mm-70.5mm and width is 13.4mm-15.7mm; the first The feeding of antenna 2 and the second antenna 3 are both made of 50 ohm tinned cable, the outer diameter of the core wire of the tinned cable is 0.3mm-0.7mm, the outer diameter of the medium is 1.6mm-2.0mm, and the outer diameter of the shielding layer is 2.0mm-2.5mm; the 2.4GHz band radiation vibrator 213 and the 5GHz band radiation vibrator 223 can be multiple groups, preferably, the 2.4GHz band radiation vibrator 213 and the 5GHz band radiation vibrator 223 are three groups. Since the 2.4 GHz band radiating oscillator 213 and the 5 GHz band radiating oscillator 223 are both arranged on the first surface plate 231 and the second surface plate 232 of the double-sided printed circuit board, a dual-frequency omnidirectional half-wave radiating oscillator can be formed. At the same time, since a frequency division and integration circuit 241 is provided on the first surface of the double-sided printed circuit board, the 2.4 GHz band radiating oscillator 213 and the 5 GHz band radiating oscillator 223 are connected through the frequency division and integration circuit 241, which can greatly expand the width of the frequency band of the first antenna 2, thereby realizing the multi-frequency and broadband characteristics of the frequency band. In addition, the first antenna 2 has a small size, high gain, simple structure, easy installation, low cost, and easy large-scale production, while having dual-band coverage and excellent radiation performance indicators.

[0060] Further, see Figure 7As a specific implementation of the combined antenna applied to the roadside unit provided by the present invention, a first open circuit 2411, a second open circuit 2412 and an impedance matcher 2413 are provided on the frequency division and integration line 241; the first open circuit 2411 is provided on the frequency division and integration line 241 close to one end of the 2.4GHz frequency band radiation oscillator 213; the second open circuit 2412 and the impedance matcher 2413 are provided on the frequency division and integration line 241 close to one end of the 5GHz frequency band radiation oscillator 223. In specific implementation, the first open circuit 2411, the second open circuit 2412 and the impedance matcher 2413 can be set to multiple; preferably, the first open circuit 2411, the second open circuit 2412 and the impedance matcher 2413 are all set to four. Four first open circuits 2411 and four second open circuits 2412 are respectively set at one end close to the 2.4 GHz band radiating oscillator 213 and one end close to the 5 GHz band radiating oscillator 223. At the same time, four impedance matchers 2413 are set at one end close to the 5 GHz band radiating oscillator 223. The 2.4 GHz band and the 5 GHz band can be combined into one to realize the dual-frequency characteristics of the first antenna 2.

[0061] Furthermore, as a specific implementation of the combined antenna applied to the roadside unit provided by the present invention, the first opener 2411, the second opener 2412 and the impedance matcher 2413 are all irregular shapes, so that the first antenna 2 can obtain better electrical performance parameters.

[0062] Further, see Figure 5 , Figure 6 and Fig.31 As a specific embodiment of the combined antenna applied to the roadside unit provided by the present invention, a cable core hole 2421 is opened on the ground welding plate 242, the external structure of the first antenna 2 includes a first glass fiber reinforced plastic cap 27, a first glass fiber reinforced plastic outer cover 28, a first aluminum sleeve 29 and a first connector 26, and the internal structure of the first antenna 2 also includes a first connecting cable 25; the first connecting cable 25 includes a first end 251 and a second end 252, the inner conductor of the first end 251 passes through the cable core hole 2421 and is welded and connected at the feeding point 2414 of the frequency division and integration circuit 241; the outer conductor of the first end 251 is welded and connected on the ground welding plate 242; the second end 252 is welded and fixedly connected to one end of the first connector 26, and the other end of the first connector 26 is connected to the transceiver device 1.

[0063] Further, see Figure 8-Figure 12As a specific embodiment of the combined antenna applied to the roadside unit provided by the present invention, the positioning antenna 4 includes an antenna cover 41 and a third connector 42, and a ceramic sheet 411, a third printed circuit board 412, a mounting steel plate 413 and a third connecting cable 414 are arranged in the antenna cover 41; the mounting steel plate 413 is fixed in the antenna cover 41, the ceramic sheet 411 and the third printed circuit board 412 are fixed on the mounting steel plate 413, the ceramic sheet 411 and the third printed circuit board 412 are welded and connected, one end of the third connecting cable 414 is welded and connected to the third printed circuit board 412, the other end of the third connecting cable 414 is welded and connected to one end of the third connector 42, and the other end of the third connector 42 is connected to the transceiver device 1. In a specific implementation, the positioning antenna 4 is fed with a 50 ohm high temperature cable, the outer diameter of the high temperature cable core wire is 0.12mm-0.22mm, the outer diameter of the medium is 0.4mm-0.6mm, the outer diameter of the shielding layer is 1.43mm-1.62mm, and the outer diameter of the outer skin is 2.45mm-2.73mm; the antenna cover 41 can be a mushroom head antenna cover 41; the height of the antenna cover 41 is 105-115mm, the diameter of the antenna cover 41 is 103-113mm, and the material used for the antenna cover 41 is UV-resistant ABS; the mounting plate The thickness is 0.35mm-0.55mm, the diameter is 86.5mm-90.7mm, and the material used is nickel-plated steel plate; the length of the ceramic sheet 411 is 23.4mm-27.6mm, the width of the ceramic sheet 411 is 24.8mm-26.3mm, the thickness is 3.25mm-5.53mm, the material used is ceramic, and the dielectric constant is 8.3-11.7; the outer diameter of the third printed circuit board 412 is 53.3mm-77.5mm, the thickness is 1.23mm-2.35mm, and the dielectric constant is 4.3-4.7.

[0064] Please refer to 13- Fig.29The samples of the present invention have been improved and perfected for many times, and finally verified by instrument detection, involving WLAN and WIFI frequency bands (2400MHz-2500MHz / 5150MHz-5850MHz), 2G (second generation mobile communication system), 3G (third generation mobile communication system), 4G (fourth generation mobile communication system) and 5G (fifth generation mobile communication system) frequency bands (698MHz-960MHz / 1710MHz-3800MHz) and GPS / BDS frequency bands (1559MHz-1580MHz) z), in the supporting tests of antenna and transceiver equipment, the standing wave ratio is respectively below 2.0 and 1.50, in the test of signal strength of positioning antenna, the signal strength coefficient is about 43-44; in the test of antenna radiation pattern, the gain of 2400MHz-2500MHz is 5.5dBi, the gain of 5150MHz-5850MHz is 6dBi, the gain of 698MHz-960MHz is 2dBi, the gain of 1710MHz-3800MHz is 3dBi, and the non-circularity of the horizontal plane radiation pattern is within ±1dB.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A combined antenna used in a roadside unit, characterized in that: It comprises a transceiver device (1) and the following antennas arranged on the same side of the transceiver device (1): Positioning antenna (4); A first antenna (2), wherein the internal structure of the first antenna (2) comprises a first line unit (21) and a second line unit (22) which are connected to each other, the first line unit (21) operates in a frequency band of 2.4-2.483 GHz, and the frequency range of the second line unit (22) is a frequency band of 4.910-5.875 GHz; and, The second antenna (3) operates in the 698-3800 MHz frequency band. The second antenna (3) comprises an external structure and an internal structure. The internal structure of the second antenna (3) comprises a first printed circuit board (33) with a dielectric constant of 4.3-4.

7.

2. The combined antenna used in a roadside unit according to claim 1, characterized in that: The external structure of the second antenna comprises a second glass fiber reinforced plastic cap (34), a second glass fiber reinforced plastic outer cover (35), a second aluminum sleeve (36) and a second joint (32); the second glass fiber reinforced plastic cap (34) and the second aluminum sleeve (36) are connected to two ends of the second glass fiber reinforced plastic outer cover (35); the second aluminum sleeve (36) is sleeved on the second joint (32); the internal structure of the second antenna (3) also comprises a second connecting cable (31); the first printed circuit board (33) is a single-sided printed circuit board; a feeder is provided on the first printed circuit board (33); point (331), a grounding point (332), a radiating oscillator (333) and a coupling oscillator (334); a transmission line (335) is provided at the bottom of the coupling oscillator (334); a first end of the second connector (32) is connected to the transceiver device (1), and a second end of the second connector (32) is welded to a first end of the second connecting cable (31); an inner conductor of the second end of the second connecting cable (31) is welded to the feeding point (331), and an outer conductor of the second end of the second connecting cable (31) is welded to the grounding point (332).

3. The combined antenna used in a roadside unit as claimed in claim 2, characterized in that: The top of the radiation oscillator (333) is fan-shaped, and the transmission line (335) is a wavy transmission line.

4. The combined antenna used in a roadside unit as claimed in claim 2, characterized in that: The first printed circuit board (33) has a length of 105 mm to 120 mm, a width of 13.2 mm to 14.2 mm, and a thickness of 0.40 mm to 0.80 mm.

5. The combined antenna used in a roadside unit according to any one of claims 1 to 4, characterized in that: The internal structure of the first antenna (2) further comprises a second printed circuit board (23) and a connecting unit (24); the first circuit unit (21), the second circuit unit (22) and the connecting unit (24) are all arranged on the second printed circuit board (23); the connecting unit (24) is located between the first circuit unit (21) and the second circuit unit (22) and is used to connect the first circuit unit (21) and the second circuit unit (22).

6. The combined antenna used in a roadside unit as claimed in claim 5, characterized in that: The second printed circuit board (23) is a double-sided printed circuit board, comprising a first surface board (231) and a second surface board (232) opposite to the first surface board (231); The first line unit (21) comprises a first 2.4 GHz frequency band impedance transformation section (211), a second 2.4 GHz frequency band impedance transformation section (212) and a 2.4 GHz frequency band radiation oscillator (213); the first 2.4 GHz frequency band impedance transformation section (211) is arranged on the first surface plate (231); the second 2.4 GHz frequency band impedance transformation section (212) is arranged on the second surface plate (232); the 2.4 GHz frequency band radiation oscillator (213) is arranged on the first surface plate (231) and the second surface plate (232); the first 2.4 GHz frequency band impedance transformation section (211) and the second 2.4 GHz frequency band impedance transformation section (212) are both connected to the 2.4 GHz frequency band radiation oscillator (213) for feeding; The second line unit (22) comprises a first 5 GHz frequency band impedance transformation section (221), a second 5 GHz frequency band impedance transformation section (222) and a 5 GHz frequency band radiation oscillator (223); the first 5 GHz frequency band impedance transformation section (221) is arranged on the first surface plate (231); the second 5 GHz frequency band impedance transformation section (222) is arranged on the second surface plate (232); the 5 GHz frequency band radiation oscillator (223) is arranged on the first surface plate (231) and the second surface plate (232); the first 5 GHz frequency band impedance transformation section (221) and the second 5 GHz frequency band impedance transformation section (222) are both connected to the 5 GHz frequency band radiation oscillator (223) for feeding; The connection unit (24) comprises a frequency division and integration circuit (241) provided on the first surface plate (231) and a grounding welding plate (242) provided on the second surface plate (232); Wherein, on the first surface plate (231), the 2.4 GHz frequency band radiation vibrator (213) and the 5 GHz frequency band radiation vibrator (223) are connected by feeding through the frequency division and integration circuit (241); and on the second surface plate (232), the 2.4 GHz frequency band radiation vibrator (213) and the 5 GHz frequency band radiation vibrator (223) are connected by feeding through the ground welding plate (242).

7. The combined antenna used in a roadside unit as claimed in claim 6, characterized in that: The frequency division and integration circuit (241) is provided with a first open circuit (2411), a second open circuit (2412) and an impedance matcher (2413); the first open circuit (2411) is provided at one end of the frequency division and integration circuit (241) close to the 2.4 GHz frequency band radiation oscillator (213); the second open circuit (2412) and the impedance matcher (2413) are provided at one end of the frequency division and integration circuit (241) close to the 5 GHz frequency band radiation oscillator (223).

8. The combined antenna used in a roadside unit as claimed in claim 7, characterized in that: The first open circuit device (2411), the second open circuit device (2412) and the impedance matcher (2413) are all irregularly shaped.

9. The combined antenna used in a roadside unit according to claim 6, characterized in that: The grounding welding plate (242) is provided with a cable core hole (2421); the external structure of the first antenna (2) comprises a first glass fiber reinforced plastic cap (27), a first glass fiber reinforced plastic outer cover (28), a first aluminum sleeve (29) and a first joint (26); the first glass fiber reinforced plastic cap (27) and the first aluminum sleeve (29) are connected to two ends of the first glass fiber reinforced plastic outer cover (28); the first aluminum sleeve (29) is sleeved on the first joint (26); and the internal structure of the first antenna (2) further comprises a first connecting cable (25); The first connecting cable (25) comprises a first end (251) and a second end (252); the inner conductor of the first end (251) passes through the cable core hole (2421) and is welded and connected at the feeding point (2414) of the frequency division and integration circuit (241); the outer conductor of the first end (251) is welded and connected on the ground welding plate (242); the second end (252) is welded and fixedly connected to one end of the first connector (26), and the other end of the first connector (26) is connected to the transceiver device (1).

10. The combined antenna used in a roadside unit according to claim 5, characterized in that: The positioning antenna (4) comprises an antenna cover (41) and a third connector (42), wherein a ceramic sheet (411), a third printed circuit board, a mounting steel plate (413) and a third connecting cable (414) are arranged in the antenna cover (41); the mounting steel plate (413) is fixed in the antenna cover (41), the ceramic sheet (411) and the third printed circuit board are fixed on the mounting steel plate (413), the ceramic sheet (411) and the third printed circuit board are welded and connected, one end of the third connecting cable (414) is welded and connected to the third printed circuit board, the other end of the third connecting cable (414) is welded and connected to one end of the third connector (42), and the other end of the third connector (42) is connected to the transceiver device (1).

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