CN206211023U - A kind of broadband millimeter-wave Waveguide slot antenna of use double-paraboloid cylinder feed - Google Patents

Abstract

The utility model relates to a broadband millimeter-wave waveguide slot antenna which adopts double parabolic cylinder feeding, which comprises a radiation layer and a feed network layer arranged under the radiation layer. The radiation layer consists of two upper and lower metal plates (1, 2 ) and metal parabolic cylinders (21, 22) arranged between the two upper and lower metal plates (1, 2), and a plurality of metal surfaces are arranged between the upper and lower two metal plates (1, 2) to be divided into A plurality of rectangular waveguides, each with a radiation slot; the feeding network layer consists of two upper and lower metal plates (3, 4) and a metal parabolic column arranged between the two sides of the upper and lower metal plates (3, 4) Surfaces (41, 42), and a feed network is arranged between the upper and lower metal plates (3, 4). The antenna of the utility model simplifies the feeding network, reduces the cost, widens the feeding bandwidth, improves the radiation efficiency, is simple in structure, and is convenient to use.

Description

A Broadband Millimeter-Wave Waveguide Slot Antenna Using Dual Parabolic Cylindrical Feeds

technical field

The utility model belongs to the technical field of antennas, in particular to a wide-band millimeter-wave waveguide slot antenna which adopts double parabolic cylinder feeding.

Background technique

With the continuous breakthrough of microwave technology, its application gradually develops to diversification and higher frequency bands. A significant change is the development of millimeter wave and terahertz frequency bands, which are gradually applied. As a key component of millimeter wave systems, antennas are facing new challenges. challenges and technical difficulties. It is mainly reflected in: 1. In the millimeter wave frequency band, the conductor loss and dielectric loss are much larger than those at low frequencies. For example, microstrip antennas commonly used at low frequencies, due to the serious loss of feeders, it is difficult for microstrip antennas to form larger arrays. , the efficiency of the whole antenna is not high. Then, how to design a millimeter-wave antenna with high radiation efficiency has become a difficult problem; 2. The requirements for low-profile antennas. In many application fields, whether it is radar or communication, antennas are expected to be small in size and low in height. The original high-efficiency reflector antenna cannot meet the requirements; 3. The requirements of broadband antennas. In the millimeter wave frequency band, various applications are broadband systems, which require antennas to have a high relative bandwidth, and the slot coupling feed commonly used by waveguide slot antennas The bandwidth is narrow, which is difficult to meet the requirements. Although the power distribution feed has a wide bandwidth, the structure is complex and the design is difficult.

Utility model content

Aiming at the design difficulties and requirements in the prior art, the utility model provides a broadband millimeter-wave waveguide slot antenna using double parabolic cylinder feeding, which widens the feeding width, simplifies the feeding network, and improves the radiation efficiency.

In order to achieve the above purpose, the technical solution adopted by the utility model is: provide a broadband millimeter-wave waveguide slot antenna fed by double parabolic cylinders, including a radiation layer and a feed network layer arranged below the radiation layer, the radiation The layer consists of two upper and lower metal plates and a metal parabolic cylinder arranged between the two sides of the upper and lower metal plates. Multiple metal surfaces are set between the upper and lower two metal plates to divide them into multiple rectangular waveguides. There are radiation slots; the feed network layer is composed of two upper and lower metal plates and a metal parabolic cylinder arranged between the two sides of the upper and lower metal plates, and a feed network is arranged between the upper and lower metal plates.

Further, the feed network includes a feed waveguide and H-plane horns arranged on both sides of the feed waveguide, and the two H-plane horns are connected to the feed waveguide through a T-shaped power divider.

Further, between the lower metal plate of the radiation layer and the metal parabolic cylinders on both sides and between the upper metal plate of the feed network layer and the metal parabolas on both sides, there are devices to couple the electromagnetic energy of the feed network layer below to the radiation. layer gaps.

Further, each waveguide is provided with a plurality of radiation slots along the longitudinal axis, and each radiation slot is a rectangular slot.

Further, a plurality of radiation slots are respectively located on both sides of the centerline of the waveguide, arranged in a staggered manner, and the distance between two longitudinally adjacent radiation slots is half a wavelength of the waveguide.

Further, the focal lengths of the two metal parabolic cylinders of the radiation layer differ by 1/4 wavelength, so as to meet the requirement that the phases of electromagnetic energy coupled to each radiation unit must be the same after being reflected by the metal parabolic cylinders.

Further, the radiation ports of the two H-surface horns are respectively located at the focal points of the two metal parabolic cylinders.

Further, the two metal parabolic cylinders of the radiation layer and the two metal parabolic cylinders of the feed network layer are respectively connected, and the focal lengths of the connected metal parabolic cylinders are equal.

The beneficial technical effects of the utility model are:

(1) The utility model adopts the antenna fed by double parabolic cylinders, which simplifies the feeding network and reduces the cost; widens the feeding bandwidth and improves the radiation efficiency;

(2) The structure is simple, easy to use, and the beam is not tilted in the entire frequency band;

(3) It can be applied to the field of millimeter wave radar.

Description of drawings

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

Fig. 2 is a structural schematic diagram of the radiation layer;

Fig. 3 is a schematic structural diagram of a feed network layer;

Fig. 4 is a return loss diagram;

Figure 5 is a diagram of antenna radiation efficiency;

Fig. 6 is an antenna pattern.

In the picture:

1,4-upper metal plate 2,3-lower metal plate 5-feed waveguide 21,22,41,42-metal parabolic cylinder 23,29-radiation slot 24,25,26-metal surface 27,28,43 , 44-slot 51, 52-H surface horn

detailed description

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail.

As shown in Figure 1, it is a broadband millimeter-wave waveguide slot antenna provided by the utility model that adopts double parabolic cylinder feeding. The antenna includes upper and lower layers, the upper layer is the radiation layer, and the lower layer is the feed network layer.

As shown in Figure 2, it is the radiation layer of the present utility model, and the radiation layer consists of an upper metal plate 1, a lower metal plate 2 and a metal parabolic cylinder 21 and a metal parabolic cylinder arranged between the upper metal plate 1 and the lower metal plate 2 both sides 22 metal parabolic cylinders. Multiple metal surfaces 24, 25, 26 are placed between the upper metal plate 1 and the lower metal plate 2. The multiple metal surfaces divide the radiation layer into multiple rectangular waveguides, and each waveguide is provided with rectangular radiation slots 23, 29 along the longitudinal axis. , the radiation slot 23 and the radiation slot 29 are respectively located on both sides of the waveguide center line, arranged in a staggered manner, and the distance between two longitudinally adjacent radiation slots is half a wavelength of the waveguide. In order to improve radiation efficiency, multiple radiation slots are arranged on each waveguide to form a radiation array antenna. In addition, there are gaps 27, 28 between the lower metal plate 2 and the metal parabolic cylinders 21, 22 on both sides. The gaps can couple the electromagnetic energy of the lower feeding network layer to the radiation layer.

As shown in Figure 3, it is the feeding network layer of the present utility model, and the feeding network layer is composed of a lower metal plate 3, an upper metal plate 4, and metal parabolic cylinders 41 arranged on both sides of the lower metal plate 3 and the upper metal plate 4. , 42 metal parabolic cylinders. A feed network is provided between the lower metal plate 3 and the upper metal plate 4. The feed network includes a feed waveguide 5, H-plane horns 51, 52 arranged on both sides of the feed waveguide 5, and two H-plane horns 51. The dimensions are exactly the same, and can be connected with the feed waveguide 5 through a T-shaped power divider.

Wherein, the radiation mouth surface of H surface horn 51 is positioned at the focal point of metal parabolic cylinder 41, and the radiation mouth surface of H surface horn 52 is positioned at the focal point of metal parabolic cylinder 42, and the effect of these two metal paraboloids is to put H The spherical wave radiated by the surface horn becomes a plane wave. The focal lengths of the metal parabolic cylinders 51 and 52 differ by 1/4 wavelength, so as to meet the requirement that the phases of electromagnetic energy coupled to each radiation unit must be the same after being reflected by the metal parabolic cylinders. There are gaps 43, 44 between the upper metal plate 4 and the metal parabolic cylinders 41, 42, and the gaps can couple the electromagnetic energy of the lower feeding network layer to the radiation layer.

In addition, the metal parabolic cylinder 21 is connected with the metal parabolic cylinder 41 and has the same focal length, and the metal parabolic cylinder 22 is connected with the metal parabolic cylinder 42 and has the same focal length. The lower metal plate 2 of the radiation layer is connected to the upper metal plate 4 of the feed network layer.

The working process of the broadband millimeter-wave waveguide slot antenna fed by double parabolic cylinders of the utility model is as follows: the fed-in electromagnetic energy respectively excites two H-surface horns 51 and 52 to radiate to both sides through a T-shaped power divider, and the radiated electromagnetic waves pass through The metal parabolic cylinders 41, 42 reflect and couple to the radiation layer through the gap between the metal parabolic cylinders 41, 42 and the metal plate 4 on the feed network layer, and finally radiate through the rectangular gap of the radiation layer.

The following takes the waveguide slot antenna in the ka band as an example to illustrate:

As shown in Figure 4, the return loss, taking the return loss of -13dB as the reference point, covers 23.6GHz-25.6GHz, and the bandwidth is 2GHz. This shows that the antenna of the present invention has a wide bandwidth.

As shown in Fig. 5, it is the radiation efficiency, and the radiation efficiency in the whole bandwidth is greater than 70%, up to 84%. This shows that the antenna of the present invention has high radiation efficiency.

As shown in FIG. 6 , it is the direction diagram after the center frequency is normalized. Among them, the solid line is the H plane pattern, and its first side lobe level value is lower than 17dB, and the dotted line is the E plane pattern, and its first side lobe level value is lower than 18dB.

The utility model adopts the broadband millimeter-wave waveguide slot antenna fed by double parabolic cylinders and is not limited to the above-mentioned specific implementation modes. Those skilled in the art can obtain other implementation modes according to the technical scheme of the utility model, which also belong to the technology of the utility model Innovation scope.

Claims (8)

1. a kind of broadband millimeter-wave Waveguide slot antenna of use double-paraboloid cylinder feed, including radiating layer and radiating layer is arranged on Following transmission network network layers, it is characterized in that：The radiating layer is by upper and lower two pieces of metallic plates (1,2) and is arranged on upper and lower two blocks of metals Metal parabolic cylinder (21,22) between plate (1,2) both sides is constituted, and multiple metals are set between upper and lower two pieces of metallic plates (1,2) Face is provided with radiating slot so as to be divided into multiple rectangular waveguides in each waveguide；Transmission network network layers are by upper and lower two pieces of metallic plates (3,4) And the metal parabolic cylinder (41,42) being arranged between upper and lower two pieces of metallic plates (3,4) both sides is constituted, upper and lower two pieces of metallic plates Feeding network is provided between (3,4).

2. the broadband millimeter-wave Waveguide slot antenna that a kind of use double-paraboloid cylinder as claimed in claim 1 feeds, its feature It is：The feeding network includes feed waveguide (5) and is arranged on the H faces loudspeaker (51,52) of feed waveguide (5) both sides, two H faces Loudspeaker (51,52) are connected by T-shaped power splitter with feed waveguide (5).

3. the broadband millimeter-wave Waveguide slot antenna that a kind of use double-paraboloid cylinder as claimed in claim 1 or 2 feeds, it is special Levying is：Between the lower metallic plate (2) of radiating layer and its both sides metal parabolic cylinder (21,22) and transmission network network layers upper metal It is equipped with the couple electromagnetic energy of following transmission network network layers to spoke between plate (4) and its both sides metal parabolic cylinder (41,42) Penetrate the gap of layer.

4. the broadband millimeter-wave Waveguide slot antenna that a kind of use double-paraboloid cylinder as claimed in claim 3 feeds, its feature It is：Multiple radiating slots are opened up along the longitudinal axis in each waveguide, each radiating slot is rectangular aperture.

5. the broadband millimeter-wave Waveguide slot antenna that a kind of use double-paraboloid cylinder as claimed in claim 4 feeds, its feature It is：Multiple radiating slots are located at the both sides of waveguide core line respectively, at a distance of half between interlaced arrangement, and longitudinally adjacent two radiating slots Individual waveguide wavelength.

6. the broadband millimeter-wave Waveguide slot antenna that a kind of use double-paraboloid cylinder as claimed in claim 5 feeds, its feature It is：The focal length of two metal parabolic cylinderes of radiating layer (21,22) differs 1/4 wavelength.

7. the broadband millimeter-wave Waveguide slot antenna that a kind of use double-paraboloid cylinder as claimed in claim 6 feeds, its feature It is：Two radiation port faces of H faces loudspeaker are located at two focal points of metal parabolic cylinder (41,42) respectively.

8. the broadband millimeter-wave Waveguide slot antenna that a kind of use double-paraboloid cylinder as claimed in claim 7 feeds, its feature It is：Two metal parabolic cylinderes of radiating layer (21,22) and transmission network network layers two metal parabolic cylinderes (41,42) are respectively connected with, And connected metal parabolic cylinder focal length is equal.