CN108539388B - Coupling oscillator, antenna and application thereof - Google Patents

Abstract

This application discloses a coupling oscillator, an antenna and their applications. The coupling oscillator of this application includes an integrally formed "H"-shaped oscillator arm, four insulating support columns, four metal parasitic sheets and a coupling strip line; both sides of the "H"-shaped oscillator arm have radiation extending vertically downwards. The metal sheet and the "H"-shaped vibrator arm have a bandwidth adjustment slot on the middle connecting arm. There are metal supporting conductors extending downwards on both sides of the middle connecting arm; the coupling strip line is fixedly installed on the metal supporting conductor; four insulators The support pillars are respectively arranged on the four branch arms of the "H"-shaped vibrator arm; the metal parasitic pieces are in the shape of square metal sheets and are respectively arranged directly below the four branch arms of the "H"-shaped vibrator arm. The coupled oscillator of the present application can obtain low-frequency ultra-wideband, improve antenna gain, provide a new low-frequency ultra-wideband antenna for the tetra digital trunking communication system, and improve its communication capabilities and practicality.

Description

Coupled oscillator, antenna and application thereof

Technical field

The present application relates to the field of base station antennas, and in particular to a coupling oscillator, an antenna and its application.

Background technique

Base station antenna is an essential equipment in mobile communication network engineering. Base station antennas usually include: radiating units, reflectors and feed networks. Among them, the radiating unit, or vibrator, is a component that receives or transmits electromagnetic signals. It has the function of guiding and amplifying electromagnetic waves. Usually, one or more vibrators are installed on the reflector of a base station antenna.

Tetra digital trunking communication system is a wireless trunking mobile communication system based on digital time division multiple access technology. It is widely used by public security departments, railways, transportation, large enterprises and other departments for command, dispatch, data transmission and other services. The main working frequency bands of the Tetra communication system are 350~380MHz, 380~400MHz, 410~430MHz, 420~450MHz, 450~470MHz, 806~825MHz or 851~870MHz frequency bands; the antennas generally use narrowband omnidirectional antennas of about 20~30MHz. After partitioning, each operating frequency band is generally only 2 to 5MHz, which is difficult to meet the needs of multi-region coverage. Moreover, the gain of omnidirectional antennas is generally very low, only about 5db.

Contents of the invention

The purpose of this application is to provide a coupling oscillator with a new structure, an antenna using the coupling oscillator, and its application.

This application adopts the following technical solutions:

One aspect of this application discloses a coupling vibrator, which includes an integrally formed "H"-shaped vibrator arm 1, four insulating support columns 21, 22, 23 and 24, and four metal parasitic pieces 31, 32, 33 and 34. And the coupling strip line 4; the two sides of the "H"-shaped oscillator arm 1 have radiating metal sheets 111 and 112 extending vertically downward, and the two sides form two radiating metal sheets 111 and 112 respectively, "H" The middle connecting arm 12 of the oscillator arm 1 is provided with a bandwidth adjustment slot 121 for broadband matching. Both sides of the middle connecting arm 12 have metal supporting conductors 131 and 132 extending downward obliquely. The two metal supporting conductors 131 and 132 are respectively located on both sides of the middle connecting arm 12, and are used to fixedly support the "H"-shaped vibrator arm 1 on the reflection plate; the "H"-shaped vibrator arm 1, radiation metal sheets 111 and 112, and metal support conductors 131 and 132 , the three are integrally formed; the coupling strip line 4 is fixedly installed on the metal support conductors 131 and 132, coupling the metal support conductors 131 and 132 on both sides, the "H"-shaped vibrator arm 1 and the radiation metal sheets 111 and 112 into one Radiation array; four insulating support columns 21, 22, 23 and 24 are respectively provided on the four branch arms 141, 142, 143 and 144 of the "H"-shaped vibrator arm 1, used to fix the "H"-shaped vibrator arm 1 Supported on the reflection plate; the metal parasitic sheets 31, 32, 33 and 34 are in the shape of square metal sheets, and the metal parasitic sheets 31, 32, 33 and 34 are respectively arranged on the four branch arms 141 and 142 of the "H"-shaped vibrator arm 1 , 143 and 144 directly below, and parallel to the "H"-shaped vibrator arm 1.

It should be noted that the coupled oscillator of this application can obtain low-frequency ultra-wideband through the design of the "H"-shaped oscillator arm and the radiating metal sheet structure. In one implementation of this application, its operating frequency range is 330 to 470 MHz, which can It meets the usage requirements of multi-area coverage; and through the setting of metal parasitic sheets, the beam width is reduced, so that the antenna gain reaches about 15db. In addition, the "H"-shaped vibrator arm, radiating metal sheet and metal support conductor are formed in one piece. The structure is simple and can be directly formed by stamping or cutting, making it easy to process; greatly saving material and production costs.

Preferably, the bandwidth adjustment groove 121 extends to the side where the radiation metal sheets 111 and 112 are connected to the “H”-shaped vibrator arm 1 to form a side groove 122 .

It should be noted that whether it is the bandwidth adjustment slot 121 or the side slot on the side where the "H"-shaped vibrator arm and the radiation metal sheet are connected, their function is to match the broadband to achieve the required bandwidth and frequency band.

Preferably, the bandwidth adjustment groove 121 is provided with an insulating connector 123 for stabilizing the structure of the “H”-shaped vibrator arm 1 .

It should be noted that, in one implementation of the present application, the bandwidth adjustment groove extends along the middle connecting arm to the side where the radiating metal sheet is connected to the "H"-shaped vibrator arm, and the entire bandwidth adjustment groove is relatively long. , also in an "H" shape, will affect the structural stability of the "H"-shaped vibrator arm. In order to make the vibrator arm stable without affecting the function of the bandwidth adjustment slot itself, an insulating connector 123 is used to connect both sides of the bandwidth adjustment slot. The metal parts are connected to stabilize the structure of the "H"-shaped vibrator arm 1.

Another aspect of this application discloses an antenna, which includes a reflection plate, a feed network and a coupled oscillator of the application; the "H"-shaped oscillator arm 1 passes through insulating support columns 21, 22, 23 and 24, as well as metal support conductors 131 and 132, fixedly connected to the surface of the reflection plate; among them, metal support conductors 131 and 132 support the "H"-shaped vibrator arm 1, and insulating support columns 21, 22, 23 and 24 fix the four ends of the "H"-shaped vibrator arm 1 ; The metal parasitic pieces 31, 32, 33 and 34 are fixedly installed on the surface of the reflection plate, and are located between the reflection plate and the "H" type vibrator arm 1; the feed network is a strip line and is integrated with the coupling strip line 4 Shaped and mounted on the reflective plate.

It should be noted that the metal parasitic piece is lobe-adjusted by forming a capacitance with the "H"-shaped vibrator arm. Therefore, the metal parasitic piece and the "H"-shaped vibrator arm itself are arranged in parallel and have no electrical connection. In the coupled oscillator of this application, the metal parasitic piece and the "H" shaped oscillator arm can be connected through insulating support pillars; in the antenna of this application, the metal parasitic is directly fixed and installed on the reflection plate, although the connection relationship is different. Changes, however, its structure and functionality remain the same.

Preferably, several rectangular lobe adjustment grooves 51 and 52 are provided on the reflecting plate.

Preferably, one or more coupling oscillators of the present application are installed on the reflection plate.

It can be understood that, according to the usage requirements or environment of the antenna, one or more coupling oscillators can be installed on a reflecting plate, as shown in Figures 5 to 7 in the embodiment of the present application.

Another aspect of the present application discloses the application of the coupled oscillator of the present application or the antenna of the present application in a tetra digital trunking communication system.

It should be noted that the coupled oscillator of the present application, or the antenna using the coupled oscillator, has low frequency and ultra-wideband, so it can cover multiple areas, and the antenna gain reaches about 15db, which can greatly improve the performance of the tetra digital trunking communication system. Use performance. It can be understood that the coupled oscillator or antenna of the present application has low-frequency ultra-wideband and high gain, and can also be applied to other systems or devices that require similar functions, and is not limited to tetra digital trunking communication systems.

The beneficial effects of this application are:

The coupling oscillator of this application, through the design of the "H"-shaped oscillator arm and the radiating metal sheet structure, can obtain low-frequency ultra-wideband and greatly improve the antenna gain; on the other hand, the radiating metal sheet extends vertically downward, reducing the The width of the vibrator and antenna is reduced, and the structure is more compact and practical. This application provides a new low-frequency ultra-wideband coupling oscillator and antenna for the tetra digital trunking communication system, which improves the communication capabilities and practicality of the tetra digital trunking communication system.

Description of the drawings

Figure 1 is a schematic diagram of the internal structure of the antenna in the embodiment of the present application;

Figure 2 is a schematic structural diagram of the "H"-shaped oscillator arm, radiating metal sheet and metal support conductor of the coupling oscillator in the embodiment of the present application;

Figure 3 is a schematic structural diagram of the "H"-shaped oscillator arm, radiating metal sheet and metal support conductor of the coupling oscillator in the embodiment of the present application from another perspective;

Figure 4 is a schematic structural diagram of the reflective plate part in the embodiment of the present application;

Figure 5 is a schematic diagram of the internal structure of the antenna in the second implementation mode in the embodiment of the present application;

Figure 6 is a schematic diagram of the internal structure of the antenna in the third implementation manner in the embodiment of the present application;

Figure 7 is a schematic diagram of the internal structure of the antenna in the fourth implementation manner in the embodiment of the present application;

Figure 8 is a diagram of the antenna return loss test results in the embodiment of the present application;

Figure 9 is the horizontal plane pattern test result of a single vibrator in the embodiment of the present application;

Figure 10 is the vertical pattern test result of the two array antennas in the embodiment of the present application;

Figure 11 is the vertical pattern test result of the three-array antenna in the embodiment of the present application;

Figure 12 is the vertical pattern test result of the four-array antenna in the embodiment of the present application.

Detailed ways

The present application will be further described in detail below through specific examples. The following examples only further illustrate the present application and should not be construed as limitations of the present application.

Example

The coupled vibrator in this example, as shown in Figures 1 to 3, includes an integrally formed "H"-shaped vibrator arm 1, four insulating support columns 21, 22, 23 and 24, and four metal parasitic pieces 31, 32, 33 and 34, and coupled stripline 4. The two sides of the "H"-shaped vibrator arm 1 have radiating metal sheets 111 and 112 extending vertically downward, and the two sides form two radiating metal sheets 111 and 112 respectively. The middle connecting arm 12 of the "H"-shaped vibrator arm 1 is provided with a bandwidth adjustment slot 121 for broadband matching; the bandwidth adjustment slot 121 extends to the side where the radiating metal sheets 111 and 112 are connected to the "H"-shaped vibrator arm 1. The side grooves 122 are formed; and the bandwidth adjustment groove 121 is provided with an insulating connector 123 for stabilizing the structure of the “H”-shaped vibrator arm 1 . There are metal support conductors 131 and 132 extending obliquely downward on both sides of the middle part of the middle connecting arm 12 respectively, for fixing and supporting the "H"-shaped vibrator arm 1 on the reflection plate. The “H”-shaped vibrator arm 1, radiation metal sheets 111 and 112, and metal support conductors 131 and 132 are all integrally formed. The coupling strip line 4 is fixedly installed on the metal support conductors 131 and 132, coupling the metal support conductors 131 and 132 on both sides, the "H"-shaped vibrator arm 1 and the radiation metal sheets 111 and 112 into a radiation array. Four insulating support columns 21, 22, 23 and 24 are respectively provided on the four branch arms 141, 142, 143 and 144 of the "H"-shaped vibrator arm 1, for fixedly supporting the "H"-shaped vibrator arm 1 on the reflection on the board. The metal parasitic pieces 31, 32, 33 and 34 are in the shape of square metal pieces. The metal parasitic pieces 31, 32, 33 and 34 are respectively arranged at the front of the four branch arms 141, 142, 143 and 144 of the "H" shaped vibrator arm 1. below, and parallel to the “H”-shaped vibrator arm 1.

The antenna in this example, as shown in Figures 1 and 4, includes a reflector, a feed network and a coupling oscillator. The “H”-shaped vibrator arm 1 is fixedly connected to the surface of the reflection plate through insulating support columns 21, 22, 23 and 24 and metal support conductors 131 and 132; among them, the metal support conductors 131 and 132 connect the “H”-shaped vibrator arm 1 When supported, the insulating support columns 21, 22, 23 and 24 fix the four ends of the "H"-shaped vibrator arm 1; the metal parasitic pieces 31, 32, 33 and 34 are fixedly installed on the surface of the reflection plate, and are located between the reflection plate and the " Between the H"-shaped vibrator arms 1; the feed network is a strip line, and is integrally formed with the coupling strip line 4 and installed on the reflection plate. As shown in Figure 4, several rectangular lobe adjustment grooves 51 and 52 are provided on the reflecting plate.

According to usage requirements, in other implementations of this example, two or more coupled oscillators of this example are installed on the reflection plate, as shown in Figures 5 to 7. Among them, Figure 5 is a schematic structural diagram of installing two coupling oscillators, Figure 6 is a schematic structural diagram of installing three coupling oscillators, and Figure 7 is a schematic structural diagram of installing four coupling oscillators.

In this example, the Agilent E5071C network analyzer was used to test the antenna in this example. The results show that the return loss in the range of 330 to 470MHz is better than -16.5db, as shown in Figure 8, indicating that the bandwidth meets the design requirements.

An outdoor far-field test was conducted on the antenna in this example to test the horizontal plane pattern of a single oscillator. The results are shown in Figure 9 and Table 1. The results show that the beam width of the oscillator in this example is approximately 68-76 degrees.

Table 1 Horizontal plane lobe width test results at each frequency point

Frequency(MHz) Lobe width (degrees) Frequency(MHz) Lobe width (degrees) 330 70.1 410 75.5 350 76.3 430 70.6 370 76.1 450 69.2 390 71.6 470 68.4 400 72.9 \ \

The vertical pattern test of the antenna in this example was performed. In this example, two array antennas, three array antennas and four array antennas were tested respectively. The results are shown in Figure 10 to Figure 12. Figures 10 to 12 show the two array antennas, Vertical plane pattern test of three-array antenna and four-array antenna. The results show that in the 330-470MHz frequency band, the vertical pattern of each frequency point meets the design requirements.

The above content is a further detailed description of the present application in combination with specific implementation modes, and it cannot be concluded that the specific implementation of the present application is limited to these descriptions. For those of ordinary skill in the technical field to which this application belongs, several simple deductions or substitutions can be made without departing from the concept of this application, which should be regarded as falling within the protection scope of this application.

Claims (6)

1. A coupling vibrator, characterized by: including an integrally formed "H"-shaped vibrator arm (1), insulating support columns (21, 22, 23, 24), and metal parasitic sheets (31, 32, 33, 34) and coupled stripline(4); The two sides of the "H"-shaped vibrator arm (1) have radiating metal sheets (111, 112) extending vertically downward, and the middle connecting arm (12) of the "H"-shaped vibrator arm (1) is provided with a useful Based on the bandwidth adjustment slot (121) that matches the broadband, there are metal support conductors (131, 132) extending downward obliquely on both sides of the middle of the middle connecting arm (12), which are used to fix the "H"-shaped vibrator arm (1) Supported on the reflection plate; the "H"-shaped vibrator arm (1), radiation metal sheets (111, 112) and metal support conductors (131, 132) are integrally formed; The coupling strip line (4) is fixedly installed on the metal support conductor (131, 132), and the metal support conductors (131, 132), "H"-shaped vibrator arm (1) and radiation metal sheet on both sides are (111, 112) coupled into a radiation array; The insulating support columns (21, 22, 23, 24) are arranged on the four branch arms (141, 142, 143, 144) of the "H"-shaped vibrator arm (1), and are used to connect the "H"-shaped vibrator arm (1) Fixed support on the reflective plate; The metal parasitic pieces (31, 32, 33, 34) are in the shape of square metal pieces, and the metal parasitic pieces (31, 32, 33, 34) are respectively arranged on the four branch arms (1) of the "H"-shaped vibrator arm (1). 141, 142, 143, 144), and parallel to the "H"-shaped vibrator arm (1); The bandwidth adjustment groove (121) extends to the side where the radiation metal sheet (111, 112) is connected to the "H"-shaped vibrator arm (1), forming a side groove (122). 2. The coupling oscillator according to claim 1, characterized in that: the bandwidth adjustment groove (121) is provided with an insulating connector (123) for stabilizing the structure of the "H"-shaped oscillator arm (1). 3. An antenna, comprising a reflection plate, a feed network and the coupling oscillator according to claim 1 or 2; the "H"-shaped oscillator arm (1) passes through the insulating support column (21, 22, 23, 24 ) and the metal support conductors (131, 132) are fixedly connected to the surface of the reflection plate; the metal parasitic pieces (31, 32, 33, 34) are fixedly installed on the surface of the reflection plate, and are located between the reflection plate and Between the "H"-shaped vibrator arms (1); the feed network is a strip line and is integrally formed with the coupling strip line (4) and installed on the reflection plate. 4. The antenna according to claim 3, characterized in that a plurality of rectangular lobe adjustment grooves (51, 52) are provided on the reflection plate. 5. The antenna according to claim 3 or 4, characterized in that one or more coupling elements are installed on the reflecting plate. 6. Application of the coupled oscillator according to claim 1 or 2 or the antenna according to any one of claims 3 to 5 in the tetra digital trunking communication system.