CN204103037U - The indoor access antenna of a kind of Q-band ultrahigh speed WLAN (wireless local area network) - Google Patents

Abstract

The utility model discloses a Q-band ultra-high-speed wireless local area network indoor access antenna, which includes a radiation unit and a feeder part, and the radiation unit and the feeder part are printed on the same dielectric substrate through printed circuit technology; wherein, the radiation unit adopts a printed umbrella The antenna is composed of an angularly symmetrical vibrator and a printed guiding unit. Differential feeding is realized through the substrate-integrated waveguide, and the broadband impedance matching is realized by using the loaded inductive window structure. The connection structure and so on realize the interconnection with the external circuit. The utility model aims at the requirements of the Q-band new-generation ultra-high-speed wireless local area network standard and the relevant millimeter-wave indoor communication system standard 802.11aj (45GHz), and uses the printed circuit technology to realize a wide working frequency band (42.4-48.5GHz) and a An access antenna with not less than 120° wide beam coverage and integrated with planar active millimeter wave circuits.

Description

A Q-band ultra-high-speed wireless local area network indoor access antenna

technical field

The utility model belongs to the technical field of wireless communication, in particular to a Q-band ultra-high-speed wireless local area network indoor access antenna.

Background technique

The millimeter wave frequency band has the characteristics of abundant available spectrum resources and high data transmission rate. It has been widely concerned by the industry and has begun to develop related ultra-high-speed communication systems. According to the frequency planning of the Ministry of Industry and Information Technology of my country, the 42.4-48.4GHz spectrum resources in the Q-band have been designated as ultra-high-speed wireless LAN services and announced at the end of 2013. The communication standardization work related to this frequency spectrum is being carried out extensively. Among them, the 802.11aj (45GHz) standard working group was established in 2012 with the permission of the International Institute of Electrical and Electronics Engineers. This standard is dedicated to the development of spectrum resources in the 45GHz frequency band for a new generation of ultra-high-speed wireless LAN communications, mainly supporting high-speed access and interconnection between various indoor wireless terminals and the backbone network.

According to the spectrum division of 45GHz ultra-high-speed wireless LAN and the requirements of indoor application scenarios, higher requirements are put forward for the access antenna. The access antenna not only needs to meet a wide working frequency band, but also needs to have an extremely wide beam (ie, 3dB beam width) in any tangent plane in the main direction to achieve effective coverage of indoor space. According to the size of conventional rooms in my country, the following calculations are made (without loss of generality): set the limit size of a conventional living room or meeting room as 7 meters x 7 meters (the total area is about 50 square meters, and the diagonal length is 10 meters). The height is 3 meters; when the wireless access device is installed in the center of the ceiling of the living room or conference room, it can be calculated that the spatial coverage angle of the antenna must be no less than 120° to effectively cover the entire room (the corner of the room is an extreme case ); therefore, the antenna of the access device is required to provide 120° coverage of the entire space. For larger rooms or larger room width and height ratios, multi-access point layout adjustments can be adopted. At present, conventional antenna forms basically cannot satisfy 120° coverage in all main cutting planes at the same time. In addition, in order to realize the wide beam coverage of the antenna's main section, an additional reflection structure is usually introduced, which will increase the volume of the antenna and the workload of assembly. Therefore, wide-beam antenna design is a difficult point in the design of millimeter-wave indoor communication systems.

The highly integrated design of the communication system can effectively reduce the volume of the system and reduce the extra loss and system power consumption caused by switching between discrete modules, which is an inevitable trend in the development of today's communication systems. As an important part of the millimeter wave communication system, the antenna needs to fully consider the interconnection and integration with external circuits during the design process. The antenna form based on printed circuit technology has the advantage of being interconnected with the planar circuit inherently. By using the planar transmission line as the antenna feeder, it can realize a natural transition with the subsequent transceiver circuit. Commonly used forms of planar transmission lines include microstrip lines and striplines, etc., which have a large number of applications in radio frequency and microwave frequency bands. However, in the millimeter wave frequency band, microstrip lines and coplanar waveguides have large metal loss and radiation loss. These losses not only deteriorate the performance of the system, but the radiation loss will also affect the radiation performance of the antenna. Therefore, how to choose a planar feeder with low loss and no radiation is also a difficult point that must be solved in the development of millimeter-wave communication antennas.

Contents of the invention

Purpose of the utility model: The purpose of this utility model is to provide a Q-band ultra-high-speed wireless LAN indoor access antenna with a small size, a large radiation range, and effectively reduced metal loss and radiation loss.

Technical solution: The utility model provides a Q-band ultra-high-speed wireless local area network indoor access antenna, including a radiation unit and a feeder part, and the radiation unit and the feeder part are printed on the same dielectric substrate through printed circuit technology;

Wherein, an acute-angled metal strip is printed on the upper surface and the lower surface of the dielectric substrate where the radiation unit is located, and the upper metal strip is printed on the upper surface of the dielectric substrate, and the lower metal strip is printed on the lower surface of the dielectric substrate. The projections of the upper metal strip and the lower metal strip on the plane of the dielectric substrate are mirror-symmetrical, and one side overlaps with each other, and the overlapped part forms a parallel double-line structure, and the upper metal strip and the lower metal strip form a clip. Angle-symmetric oscillator radiation structure; three upper-lead unit metal strips are printed in parallel on the same side as the dielectric substrate of the upper metal strip, and three lower-lead unit metal strips are also printed in parallel on the same side as the dielectric substrate of the lower metal strip. The metal strips to the unit, the metal strips leading to the unit and the metal strips leading to the bottom are also mirror symmetrically distributed;

The upper and lower surfaces of the dielectric substrate where the feeder part is located are respectively printed with metal layers, which are respectively connected with the upper and lower metal strips of the radiation unit, and are integrated with the two linear metallized through hole arrays formed by the arrangement of the metallized through holes and the formed substrate. waveguide structure;

The substrate integrated waveguide is connected with the coplanar waveguide through a transition structure.

Further, it also includes three inductive windows, the three inductive windows are composed of three groups of metallized through holes, and the three inductive windows are arranged on the cross-section of the integrated waveguide of the substrate. The inductive window structure is loaded on the cross-section of the substrate integrated waveguide, which can realize broadband impedance matching and expand the bandwidth at the same time.

Further, the transfer structure includes two symmetrical folding slits etched on the upper surface metal layer, the metal strip surrounded by the two symmetrical folding slits is the central conductor of the coplanar waveguide, and the ground on both sides of the coplanar waveguide In the structure, two L-shaped through-hole arrays are formed by the arrangement of metallized through-holes to communicate with the metal layers on the upper and lower surfaces. This can effectively improve the transfer effect. the

Furthermore, the dielectric substrate is T-shaped, and fixing screw holes (7) are provided at both lateral ends of the dielectric substrate, which is more convenient for testing, installation and fixing.

Further, the included angle of the acute-angled metal strip is 30°-38°.

Further, the distance between each of the metal strips (13) and (14) leading up and down to the unit is 0.2 mm.

Further, the distance between the inductive windows is 1/2 of the waveguide length.

Working principle: The radiation unit of the utility model is composed of a printed umbrella-shaped angle-symmetric vibrator and a printed guide unit. The differential feed is realized through the substrate integrated waveguide, and the broadband impedance matching is realized by using the loaded inductive window structure. The antenna form can be The interconnection with external circuits is realized by coplanar waveguide transfer or substrate integrated waveguide transfer structure. Among them, by introducing the printed guide unit, the electromagnetic wave can be guided to diffuse radiation, effectively improving the beam coverage capability of the antenna, and the coverage capability of the beam broadband greater than 120° in any main tangent plane can be achieved without additional additional structures; moreover, The loading inductive window structure introduced in the feeder part can effectively increase the working bandwidth of the antenna, so that the working frequency band of the antenna can better meet the requirements of the relevant spectrum division of the Ministry of Industry and Information Technology and the Q-band communication standard. The utility model aims at the requirements of the Q-band new generation ultra-high-speed wireless local area network standard and the related millimeter-wave indoor communication system standard 802.11aj (45GHz), and uses the printed circuit technology to realize a wide working frequency band and a wide beam not less than 120° in the main cutting plane. Coverage, access antennas that can be integrally integrated with planar active mmWave circuits.

Beneficial effects: compared with the prior art, the utility model has the advantages of simple structure, small size, easy integration, high precision, good repeatability, no need for additional assembly, low cost, convenient mass production, etc., and effectively reduces the metal loss and radiation loss. The antenna provided by the utility model can be processed and shaped only by a printed circuit process without additional additional structures, which is more convenient for the integrated design and realization of the common substrate of the radio frequency circuit.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the S parameter measurement result of antenna in embodiment 1;

Figure 3(a) is the normalized simulation and measurement results of the radiation pattern of the electric field plane in Example 1;

FIG. 3( b ) is the normalized simulation and measurement results of the radiation pattern of the magnetic field plane in Example 1.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described further.

Embodiment 1: As shown in Figure 1, a Q-band ultra-high-speed wireless local area network indoor access antenna includes a radiation unit 1 and a feeder unit 2, and the two parts are printed on the same dielectric substrate by using printed circuit technology.

An acute-angled metal strip is printed on the upper surface and the lower surface of the dielectric substrate where the radiation unit 1 is located, wherein the included angle of the acute-angled metal strip is between 30°-38°. The upper metal strip 11 is on the upper surface of the dielectric substrate, and the lower metal strip 12 is on the lower surface of the dielectric substrate. The projections of the upper metal strip 11 and the lower metal strip 12 on the dielectric substrate plane are mirror symmetric, showing Umbrella-shaped distribution, and the 'umbrella handles' are partially overlapped to form a parallel double-line structure, and the upper metal strip 11 and the lower metal strip 12 form an angle-symmetric oscillator radiation structure; on the same side as the dielectric substrate of the upper metal strip 11, there Three upper lead unit metal strips 13 are printed in parallel, and three lower lead unit metal strips 14 are also printed in parallel on the same side of the dielectric substrate as the lower metal strip 12. The leading metal strips 14 are also distributed mirror-symmetrically; wherein, the distance between each leading up and down leading unit metal strips ( 13 ) and ( 14 ) is 0.2 mm.

The upper and lower surfaces of the dielectric substrate of the feeder part 2 are respectively printed with metal layers, which are respectively connected with the upper and lower metal strips 11 and 12 of the radiation unit, and are arranged with the metallized through holes 3 to form two linear metallized through hole arrays 31 and 32 form a substrate-integrated waveguide structure. On the cross-section of the substrate integrated waveguide at a certain interval, three pairs of metallized through holes 33 and 34, 35 and 36, 37 and 38 respectively constitute three inductive window structures; the distance between the inductive windows is about half One waveguide length, but the interval between each inductive window is not equal.

The substrate-integrated waveguide is connected to the coplanar waveguide through a transfer structure, wherein the transfer structure is realized by two symmetrical folding slits 4 etched on the upper surface metal layer, and the metal strip 5 surrounded by the two slits 4 It is the central conductor of the coplanar waveguide. In the structure on both sides of the coplanar waveguide, two L-shaped through hole arrays 6 are formed by the arrangement of the metallized through holes 3 to communicate with the metal layers on the upper and lower surfaces. In order to test and install and fix, a pair of fixing screw holes 7 are opened on the dielectric substrate. The utility model effectively reduces the volume of the whole antenna because the metal strip used to guide the unit is used to replace the metal block in the prior art to connect with the external circuit.

As shown in Figure 2, the reflection coefficient of the designed antenna is less than -12dB within 42.4-48.4GH, which meets the application requirements of Q-band ultra-high-speed wireless LAN.

As shown in Figure 3(a) and Figure 3(b), the 3dB beamwidth of the radiation pattern of the designed antenna on the electric field plane and magnetic field plane can reach 120°, and the maximum gain fluctuates at 2.3-2.5dBi. The relatively small maximum gain of the utility model indicates that the radiation range or direction angle of the antenna is larger.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made. Retouching should also be regarded as the scope of protection of the present utility model.

Claims (7)

1. A Q-band ultra-high-speed wireless local area network indoor access antenna, characterized in that it includes a radiating unit (1) and a feeder part (2), and the radiating unit (1) and the feeder part (2) are printed on the same piece of medium on the substrate; Wherein, an acute-angled metal strip is printed on the upper surface and the lower surface of the dielectric substrate where the radiation unit (1) is located, and the upper metal strip (11) is printed on the upper surface of the dielectric substrate, and the lower surface of the dielectric substrate is The surface is the lower metal strip (12). The projections of the upper metal strip (11) and the lower metal strip (12) on the medium substrate plane are mirror-symmetrical, and one side overlaps with each other. A parallel double-line structure is formed, and the upper metal strip (11) and the lower metal strip (12) form an angle-symmetrical oscillator radiation structure; on the same side as the dielectric substrate of the upper metal strip (11), parallel printing 3~5 metal strips (13) leading up to the unit, and 3~5 metal strips (14) leading down to the unit are also printed in parallel on the same side of the dielectric substrate as the lower metal strip (12). The leading unit metal strips (13) and the downward leading metal strips (14) are also mirror-symmetrically distributed; The upper and lower surfaces of the dielectric substrate where the feeder line part (2) is located are respectively printed with metal layers, respectively connected with the upper and lower metal strips (11) and (12) of the radiation unit, and arranged with the metallized through holes (3) to form a The two linear metallized through hole arrays (31) and (32) form a substrate integrated waveguide structure; The substrate integrated waveguide is connected with the coplanar waveguide through a transition structure. 2. The Q-band ultra-high-speed wireless local area network indoor access antenna according to claim 1, characterized in that: it also includes three inductive windows, and the three inductive windows are composed of three groups of metallized through holes (33) and (34 ), (35) and (36), (37) and (38), the three inductive windows are arranged on the cross-section of the substrate integrated waveguide. 3. The Q-band ultra-high-speed wireless local area network indoor access antenna according to claim 1, characterized in that: the transfer structure includes two symmetrical folded slits (4) etched on the metal layer on the upper surface, which are divided by two The metal strip (5) surrounded by symmetrical folding gaps (4) is the central conductor of the coplanar waveguide. In the structure of the ground on both sides of the coplanar waveguide, two L-shaped through-holes (3) are arranged to form two L-shaped The through hole array (6) communicates with the upper and lower surface metal layers.            4. The Q-band ultra-high-speed wireless local area network indoor access antenna according to claim 1, characterized in that: the dielectric substrate is T-shaped, and fixing screw holes (7) are provided at both ends of the dielectric substrate in the transverse direction. 5. The Q-band ultra-high-speed wireless local area network indoor access antenna according to claim 1, characterized in that: the included angle of the acute-angled metal strips is 30°-38°. 6. The Q-band ultra-high-speed wireless local area network indoor access antenna according to claim 1, characterized in that: the distance between each of the metal strips (13) and (14) leading up and down to the unit is 0.2mm . 7. The Q-band ultra-high-speed wireless local area network indoor access antenna according to claim 2, characterized in that: the distance between the perceptual windows is 1/2 of the waveguide length.