CN103531914B - Based on the high-rder mode resonant slot antenna of hexagon substrate integration wave-guide - Google Patents

Abstract

The invention discloses a kind of high-rder mode resonant slot antenna based on hexagon substrate integration wave-guide that can realize two bending radiating slot homophase feeds.This antenna comprises medium substrate, upper surface metal level, lower surface metal layer, upper surface metal level is etched with T-shaped co-planar waveguide input altogether, lower surface metal layer is etched with the first bending radiating slot, second bending radiating slot, described T-shaped altogether co-planar waveguide input strides across the first bending radiating slot, the bending place of T-shaped co-planar waveguide input altogether is that the chamber central of hexagon substrate integrated wave-guide cavity wave is to 2/3 of datum line distance to the distance between datum line, TM in hexagon substrate integrated wave-guide cavity wave can to have been encouraged near center operating frequency ₁₁₀mode field distributes, thus realizes the homophase feed to two bending radiating slots, and the application of two symmetrical in opposite directions bending radiating slots reduces the lateral dimension of antenna.Be adapted at antenna technical field to apply.

Description

High-Order Mode Resonant Slot Antenna Based on Hexagonal Substrate Integrated Waveguide

technical field

The invention relates to the technical field of microwave and millimeter wave antennas, in particular to a high-order mode resonant slot antenna based on a hexagonal substrate integrated waveguide.

Background technique

The traditional metal waveguide cavity slot antenna has the advantages of narrow main lobe width, high radiation efficiency, high gain and fixed beam pointing, etc., and is widely used in microwave and millimeter wave radar and communication systems. A complete metal waveguide cavity slot antenna system is composed of multiple metal waveguides. Slits are etched on the wall of some of the waveguides whose terminals are short-circuited to form a radiation unit, and the other part of the waveguides is used as a feed network. However, the traditional metal waveguide cavity slot antenna also has problems such as difficult design, large volume, heavy weight, high cost, and difficulty in processing and planar integration.

The propagation characteristics of the substrate-integrated waveguide are similar to those of the rectangular metal waveguide. The slot antenna formed by the substrate-integrated waveguide technology has similar performance to the traditional metal waveguide cavity slot antenna. However, the resonance modes excited by the existing integrated waveguide slot antennas based on hexagonal substrates are generally low, resulting in fewer radiation slots. Generally, there is only one slot, and it is impossible to feed multiple radiation slots in the same phase, and it is difficult to excite high-order modes. And it is easily affected by interference mode, so it is difficult to obtain high gain and ideal pattern.

Contents of the invention

The technical problem to be solved by the present invention is to provide a high-order mode resonant slot antenna based on a hexagonal substrate integrated waveguide that can realize in-phase feeding to two bent radiation slots.

The technical solution adopted by the present invention to solve the above technical problems is: the high-order mode resonant slot antenna based on the hexagonal substrate integrated waveguide includes a dielectric substrate and an upper surface metal layer and a lower surface metal layer arranged on the surface of the dielectric substrate. The dielectric substrate is provided with a metallized through-hole array penetrating through the dielectric substrate. The metallized through-hole array, the upper surface metal layer and the lower surface metal layer together form a hexagonal substrate integrated waveguide cavity. A T-shaped co-ground coplanar waveguide input end is etched on the metal layer, and two bent radiation slots are etched on the metal layer on the lower surface, which are respectively the first bent radiation slot and the second bent radiation slot. A bent radiation slot and a second bent radiation slot are arranged symmetrically with the cavity center point of the hexagonal substrate integrated waveguide cavity, the first bent slot includes a first horizontal slot and two horizontal slots from the first horizontal slot Two first inclined slits extending obliquely upward at the ends, the angle between the first inclined slit and the first horizontal slit is an obtuse angle, and the two first inclined slits connected to the two ends of the first horizontal slit are along the middle The vertical line is arranged symmetrically, the second bending slit includes a second horizontal slit and two second inclined slits extending obliquely downward from both ends of the second horizontal slit, and the second inclined slit and the second horizontal slit The included angle is an obtuse angle and the two second inclined slots connected to the two ends of the second horizontal slot are arranged symmetrically along the mid-perpendicular line of the second horizontal slot, and the input end of the T-shaped common-ground coplanar waveguide straddles the first horizontal slot, T The distance between the bending point of the input end of the shape-coplanar waveguide and the reference line is 2/3 of the distance from the cavity center of the hexagonal substrate integrated waveguide cavity to the reference line, and the reference line and the first horizontal gap Parallel to and passing through the center of the metallized through-hole located under the first horizontal slit.

Further, the height of the hexagonal substrate-integrated waveguide cavity is one sixtieth of the vacuum wavelength corresponding to the central operating frequency of the antenna.

Further, the slit sizes of the first curved radiation slot and the second curved radiation slot are the same.

Further, the dielectric substrate is a Rogers5880 dielectric board with a relative permittivity of 2.2 and a thickness of 0.508 mm.

Beneficial effects of the present invention: by etching a T-shaped co-ground coplanar waveguide input end on the metal layer on the upper surface, two bending radiation slits are etched on the metal layer on the lower surface, which are respectively the first bending radiation slit, The second bent radiation slot, the first bent radiation slot and the second bent radiation slot are arranged symmetrically with the cavity center of the hexagonal substrate integrated waveguide cavity, and the first bent radiation slot includes the first bent radiation slot A horizontal slit and two first inclined slits extending obliquely upward from both ends of the first horizontal slit, the angle between the first inclined slit and the first horizontal slit is an obtuse angle and the two ends connected to the first horizontal slit The first inclined slits are arranged symmetrically along the vertical line of the first horizontal slit, and the second bent radial slit includes a second horizontal slit and two second inclined slits extending obliquely downward from both ends of the second horizontal slit, The included angle between the second inclined slit and the second horizontal slit is an obtuse angle, and two second inclined slits connected to both ends of the second horizontal slit are arranged symmetrically along the median perpendicular of the second horizontal slit. The input end of the planar waveguide crosses the first horizontal gap, and the distance from the bend of the input end of the T-shaped coplanar waveguide to the reference line is 2 times the distance from the center of the hexagonal substrate integrated waveguide cavity to the reference line. /3, using the T-shaped coplanar waveguide input end can realize the transition and impedance matching between the planar microstrip circuit structure and the hexagonal substrate integrated waveguide cavity structure, and stimulate the hexagonal substrate integration near the central operating frequency The TM ₁₁₀ mode field distribution in the waveguide cavity realizes the in-phase feeding of two bent radiation slots, and the application of two oppositely symmetrical bent radiation slots reduces the lateral size of the antenna, thereby realizing the miniaturization design of the antenna. The integration of modern microwave and millimeter wave systems is improved. In addition, the high-order mode resonant slot antenna based on the hexagonal substrate integrated waveguide can be manufactured by mature PCB technology, and has the advantages of low cost, high precision, good repeatability, easy processing, and easy The characteristics of planar integration can realize mass production and manufacturing.

Description of drawings

Fig. 1 is the structural representation of the high-order mode resonant slot antenna based on the hexagonal substrate integrated waveguide of the present invention;

Fig. 2 is a side view of the high-order mode resonant slot antenna based on the hexagonal substrate integrated waveguide of the present invention;

3 is a schematic diagram of the geometry of the high-order mode resonant slot antenna based on the hexagonal substrate integrated waveguide of the present invention;

4 is a simulation diagram of the electric field distribution of the TM ₁₁₀ mode in the cavity of the hexagonal substrate integrated waveguide at 10 GHz for the high-order mode resonant slot antenna based on the hexagonal substrate integrated waveguide of the present invention;

Fig. 5 is the test result of the reflection coefficient of the input end of the high-order mode resonant slot antenna based on the hexagonal substrate integrated waveguide of the present invention;

Fig. 6 is the test result of the radiation pattern of the E-plane and H-plane at 10 GHz for the high-order mode resonant slot antenna based on the hexagonal substrate integrated waveguide of the present invention, the solid line is the E plane, and the dotted line is the H plane;

Explanation of marks in the figure: dielectric substrate 1, upper surface metal layer 2, lower surface metal layer 3, metallized through-hole array 4, hexagonal substrate integrated waveguide cavity 5, T-shaped common-ground coplanar waveguide input end 6, The first bent radial slot 7 , the first horizontal slot 71 , the first inclined slot 72 , the second bent radial slot 8 , the second horizontal slot 81 , and the second inclined slot 82 .

Detailed ways

The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1 and 2, the high-order mode resonant slot antenna based on the hexagonal substrate integrated waveguide includes a dielectric substrate 1 and an upper surface metal layer 2 and a lower surface metal layer 3 arranged on the surface of the dielectric substrate 1. The substrate 1 is provided with a metallized through-hole array 4 penetrating the dielectric substrate 1, and the metallized through-hole array 4 together with the upper surface metal layer 2 and the lower surface metal layer 3 forms a hexagonal substrate integrated waveguide cavity. Body 5, a T-shaped co-ground coplanar waveguide input end 6 is etched on the upper surface metal layer 2, and two bent radiation slots are etched on the lower surface metal layer 3, which are respectively the first bent radiation slot 7, The second bent radiation slot 8, the first bent radiation slot 7 and the second bent radiation slot 8 are arranged symmetrically with the cavity center point of the hexagonal substrate integrated waveguide cavity 5, the first bent The radiation slot 7 includes a first horizontal slot 71 and two first inclined slots 72 extending obliquely upward from both ends of the first horizontal slot 71, the angle between the first inclined slot 72 and the first horizontal slot 71 is an obtuse angle and The two first inclined slits 72 connected to both ends of the first horizontal slit 71 are arranged symmetrically along the vertical line of the first horizontal slit 71, and the second bent radial slit 8 includes the second horizontal slit 81 and the second horizontal slit 81. Two second inclined slits 82 extending obliquely downward at the two ends of 81, the angle between the second inclined slits 82 and the second horizontal slit 81 is an obtuse angle and the two second inclined slits connected to the two ends of the second horizontal slit 81 The slot 82 is arranged symmetrically along the mid-perpendicular line of the second horizontal slot 81, the input end 6 of the T-shaped coplanar waveguide crosses the first horizontal slot 71, and the bend of the input end 6 of the T-shaped coplanar waveguide reaches The distance between the reference lines is 2/3 of the distance from the center of the hexagonal substrate integrated waveguide cavity 5 to the reference line, and the reference line is parallel to the first horizontal slit 71 and located below the first horizontal slit 71 center of the metallized via. A T-shaped co-ground coplanar waveguide input end 6 is etched on the upper surface metal layer 2, and two bent radiation slots are etched on the lower surface metal layer 3, which are respectively the first bent radiation slot 7 and the second bent radiation slot. The bent radiation slot 8, the first bent radiation slot 7 and the second bent radiation slot 8 are arranged symmetrically with the cavity center of the hexagonal substrate integrated waveguide cavity 5, and the first bent radiation slot 7 includes a first horizontal slit 71 and two first inclined slits 72 extending obliquely upward from both ends of the first horizontal slit 71, the angle between the first inclined slit 72 and the first horizontal slit 71 is an obtuse angle and connected at The two first inclined slots 72 at both ends of the first horizontal slot 71 are arranged symmetrically along the mid-perpendicular line of the first horizontal slot 71, and the second bent radial slot 8 includes the second horizontal slot 81 and the Two second inclined slits 82 extending obliquely downward at both ends, the angle between the second inclined slits 82 and the second horizontal slit 81 is an obtuse angle, and the two second inclined slits 82 connected to the two ends of the second horizontal slit 81 It is arranged symmetrically along the mid-perpendicular line of the second horizontal slot 81, the T-shaped common ground coplanar waveguide input end 6 crosses the first horizontal slot 71, and the bend of the T-shaped common ground coplanar waveguide input end 6 reaches the reference line The distance between them is 2/3 of the distance between the cavity center of the hexagonal substrate integrated waveguide cavity 5 and the reference line, and the planar microstrip circuit structure and the hexagonal The transition and impedance matching of the structure of the substrate-integrated waveguide cavity 5 stimulates the TM ₁₁₀ mode field distribution in the hexagonal substrate-integrated waveguide cavity 5 near the central operating frequency, thereby realizing the in-phase feeding of the two bent radiation slots Electricity, and the application of two opposite symmetrically bent radiation slots reduces the lateral size of the antenna, thereby realizing the miniaturization design of the antenna and improving the integration of modern microwave and millimeter wave systems. In addition, the integrated hexagonal substrate The high-order mode resonant slot antenna of the waveguide can be manufactured by mature PCB technology, which has the characteristics of low cost, high precision, good repeatability, easy processing, and easy planar integration, and can realize mass production and manufacturing.

In the above embodiment, the height of the hexagonal substrate-integrated waveguide cavity 5 is one-sixtieth of the vacuum wavelength corresponding to the central operating frequency of the antenna, which can effectively suppress the T-shaped common-ground coplanar waveguide input end 6. The slot structure radiates in the upper half space at the corresponding frequency, and at the same time, it can also make the antenna have the characteristics of small size, low profile, light weight, high gain, high radiation efficiency and high isolation.

In addition, the slot sizes of the first bent radiation slot 7 and the second bent radiation slot 8 are the same, so that the first bent radiation slot 7 and the second bent radiation slot 8 are resonant with the same central operating frequency. The radiation slots are fed in phase by the TM ₁₁₀ mode field distribution in the hexagonal substrate integrated waveguide cavity 5 near the central operating frequency, which can increase the gain within the operating bandwidth of the antenna.

Example

In this embodiment, the antenna works in the X-band, and the central operating frequency is 10 GHz. The dielectric substrate 1 is a Rogers 5880 dielectric board with a relative permittivity of 2.2 and a thickness of Hc=0.508 mm. The dimensions of the antenna are shown in Figure 3, and the specific parameters are as follows: As shown in Figure 3, the specific dimensions of the antenna are: Rc=9.7mm, Lms=4.3mm, Wms=1.5mm, Lcpw1=6.65mm, Lcpw2=1.35mm , Gcpw=0.5mm, Ls1=5.1mm, Ls2=3.5mm, Ws=0.8mm, theta=120°, Os=1.2mm, Dv=1mm, Pv=1.4mm, Ov=1.15mm.

The antenna is at the central operating frequency of 10 GHz, and the simulation results of the electric field distribution of the TM ₁₁₀ mode in the hexagonal substrate integrated waveguide cavity 5 are shown in Figure 4. It can be seen from the figure that the first bent radiation slot 7 and the second The bent radiation slot 8 is fed in the same phase; the test results of the reflection coefficient at the input end of the antenna are shown in Figure 5, and the relative bandwidth of -10dB is 0.75%, and it effectively suppresses the transmission of the microstrip line to the input end 6 of the T-shaped coplanar waveguide. The slot structure radiates in the upper half of the space at the corresponding frequency; the antenna is at 10GHz, and the maximum gain test result is 7.71dBi. The power main lobe width test results are 65° and 90° respectively.

Claims (4)

1. A high-order mode resonant slot antenna based on a hexagonal substrate integrated waveguide, comprising a dielectric substrate (1) and an upper surface metal layer (2) and a lower surface metal layer (3) arranged on the surface of the dielectric substrate (1), said The dielectric substrate (1) is provided with a metallized through-hole array (4) penetrating through the dielectric substrate (1), and the metallized through-hole array (4) is connected with the upper surface metal layer (2) and the lower surface metal layer (3). ) together form a hexagonal substrate integrated waveguide cavity (5), which is characterized in that: a T-shaped co-ground coplanar waveguide input end (6) is etched on the upper surface metal layer (2), and a T-shaped co-ground coplanar waveguide input end (6) is etched on the lower surface metal layer Two bending radiation slits are etched on the layer (3), respectively the first bending radiation slit (7) and the second bending radiation slit (8), the first bending radiation slit (7), the second bending radiation The two bent radiation slots (8) are arranged symmetrically with the cavity center point of the hexagonal substrate integrated waveguide cavity (5), and the first bent radiation slot (7) includes a first horizontal slot (71) and Two first inclined slits (72) extending obliquely upwards at both ends of the first horizontal slit (71), the angle between the first inclined slit (72) and the first horizontal slit (71) is an obtuse angle and connected at the second Two first inclined slits (72) at both ends of a horizontal slit (71) are arranged symmetrically along the mid-perpendicular line of the first horizontal slit (71), and the second bent radial slit (8) includes a second horizontal slit (81 ) and two second inclined slits (82) extending obliquely downward from both ends of the second horizontal slit (81), the angle between the second inclined slit (82) and the second horizontal slit (81) is an obtuse angle And the two second inclined slots (82) connected to the two ends of the second horizontal slot (81) are arranged symmetrically along the mid-perpendicular line of the second horizontal slot (81), and the T-shaped coplanar waveguide input end (6) Across the first horizontal gap, the distance from the bend of the T-shaped co-ground coplanar waveguide input end (6) to the reference line is from the cavity center of the hexagonal substrate integrated waveguide cavity (5) to the reference line 2/3 of the distance, the reference line is parallel to the first horizontal slit (71) and passes through the center of the metallized through hole below the first horizontal slit (71), and the T-shaped coplanar waveguide input end ( 6) It is a strip-shaped metal layer, and a first strip slit is provided on both sides of the strip-shaped metal layer, and a second strip slit is respectively provided on both sides of the end of the input end, and any input end The end of the first strip slit on one side is vertically connected to the head end of the second strip slit. 2. The high-order mode resonant slot antenna based on the hexagonal substrate integrated waveguide as claimed in claim 1, characterized in that: the height of the hexagonal substrate integrated waveguide cavity (5) is the vacuum corresponding to the central working frequency of the antenna. One-sixtieth of a wavelength. 3. The high-order mode resonant slot antenna based on hexagonal substrate integrated waveguide according to claim 1 or 2, characterized in that: the first bent radiation slot (7), the second bent radiation slot (8) The gap size is the same. 4. The high-order mode resonant slot antenna based on hexagonal substrate integrated waveguide as claimed in claim 3, characterized in that: the dielectric substrate (1) adopts a Rogers5880 dielectric plate with a relative permittivity of 2.2 and a thickness of 0.508mm .