Miniaturized broadband main lobe direction-adjustable microstrip array antenna

Abstract

The utility model discloses a miniaturized broadband main lobe direction adjustable microstrip array antenna. The antenna is characterized in that the antenna comprises a metal floor, a dielectric substrate attached to the upper surface of the metal floor, an array radiation unit printed on the upper surface of the dielectric substrate, and a coaxial line inner core penetrating through the metal floor and the dielectric substrate; the array radiation unit comprises one or more groups of patches which are connected in series through microstrip lines, and the patch at the head part is connected with the coaxial line inner core through a coupling feeder line. According to the microstrip array antenna, through optimization and specific matching of the sizes of the coupling feeder line and the patch, the bandwidth of the microstrip array antenna can be effectively improved, meanwhile, the measurement precision is high enough, and the microstrip array antenna is not prone to being interfered by environmental clutters.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of detecting antenna especially small -size broadband main lobe pointing adjustable microstrip array antenna. BACKGROUND

[0002] Microstrip array antenna is by multiple microstrip patch antenna array, since every microstrip patch antenna has independent directional diagram, makes the adjacent patch antenna between having specific phase difference through microstrip line and connects into array and reasonably designs array spacing, makes the main lobe of microstrip array antenna point specific airspace after superposition. On this basis, the frequency of the microwave power source of microstrip array antenna is tuned, and the phase difference between adjacent patch antennas changes accordingly, which can realize the regulation and control of the main lobe beam pointing of the microstrip array antenna. However, the common microstrip antenna has very narrow frequency bandwidth, usually within 5%, and the small frequency tuning range leads to poor adjustability of the beam pointing. SUMMARY

[0003] In view of the above technical problems, the utility model provides a kind of small -size broadband main lobe pointing adjustable microstrip array antenna, the size of the coupling feed line and patch is optimized and specific collocation by the microstrip array antenna, can effectively improve the bandwidth of microstrip array antenna, while measurement accuracy is high enough and not susceptible to environmental clutter interference.

[0004] A kind of small -size broadband main lobe pointing adjustable microstrip array antenna, it is characterized by: including metal floor, the dielectric substrate that is attached to the upper surface of the metal floor, array radiation unit is printed on the upper surface of the dielectric substrate and the coaxial line inner core that penetrates the metal floor and the dielectric substrate;The array radiation unit includes a group or multiple groups of patch connected by microstrip line in series, the patch is connected between the coaxial line inner core by coupling feed line in the head.

[0005] As the preferred of the above technical solution, the patch includes five groups of patch A, patch B, patch C, patch D and patch E connected in sequence, and the five groups of patch are sequentially connected by microstrip line A, microstrip line B, microstrip line C and microstrip line D.

[0006] As the preferred of the above technical solution, all the patches are rectangular copper foil, the short side lengths of all the patches are the same, the long side lengths of the patch A and the patch E and the patch B and the patch D are the same respectively, and the long side length of the patch C, the long side lengths of the patch B and the patch D and the long side lengths of the patch A and the patch E increase in turn.

[0007] As the preferred of the above technical solution, the short side length of all the patches is 2.1mm, the long side length of the patch A and the patch E is 2.34mm, the long side length of the patch B and the patch D is 3.34mm, and the long side length of the patch C is 3.78mm.

[0008] As the preferred of the above technical solution, all the microstrip lines adopt the rectangular slender copper foil with the same size.

[0009] As the preferred of the above technical solution, the short side length of the microstrip line is 0.15mm, and the long side length is 1.25mm.

[0010] As the preferred of the above technical solution, the material of the dielectric substrate is Taconic RF-35.

[0011] The beneficial effect of the utility model lies in:

[0012] Through the optimization and specific collocation of the size of the coupling feed line and the patch of the microstrip array antenna, the relative frequency bandwidth of the microstrip array antenna reaches more than 20%, and then the main lobe pointing adjustment range reaches more than 45 degrees, and the main lobe gain of each direction is greater than 10dB, and the side lobe level is less than -10dB, so that the ranging antenna can produce high enough gain in any direction within a certain detection range required by the equipment platform, and the measurement accuracy is high enough and is not easy to be disturbed by environmental clutter. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the structural schematic diagram of the utility model.

[0014] Figure 2 It is the top view of the utility model.

[0015] Figure 3 It is the S11 parameter diagram of the port of the microstrip array antenna obtained by CST Microwave Studio simulation.

[0016] Figure 4 It is the antenna directional diagram of the microstrip array antenna under 6 typical frequency points (31.5, 32.5, 33.5, 34.5, 35.5 and 36.5GHz) obtained by CST Microwave Studio simulation.

[0017] The signs are as follows: 1-metal floor, 2-dielectric substrate, 3-array radiation unit, 31-microstrip line, 311-microstrip line A, 312-microstrip line B, 313-microstrip line C, 314-microstrip line D, 32-patch, 321-patch A, 322-patch B, 323-patch C, 324-patch D, 325-patch E, 4-coaxial line inner core, 5-coupling feed line. DETAILED DESCRIPTION

[0018] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] like Figure 1 、 Figure 2 The miniaturized broadband main lobe pointing microstrip array antenna shown is characterized by: comprising a metal floor 1, a dielectric substrate 2 adhered to the upper surface of the metal floor 1, an array radiating unit 3 printed on the upper surface of the dielectric substrate 2, and a coaxial core 4 passing through the metal floor 1 and the dielectric substrate 2; the array radiating unit 3 includes one or more groups of patches 32 connected in series through a microstrip line 31, and the patches 32 at the head are connected to the coaxial core 4 through a coupling feeder 5.

[0020] In this embodiment, the patch 32 includes five groups of patches, namely patch A321, patch B322, patch C323, patch D324 and patch E325, which are connected in sequence. The five groups of patches 32 are connected in sequence through microstrip line A311, microstrip line B312, microstrip line C313 and microstrip line D314 respectively.

[0021] In this embodiment, all of the patches 32 are made of rectangular copper foil, the short sides of all of the patches 32 are the same length, the long sides of the patch A321 and the patch E325 and the long sides of the patch B322 and the patch D324 are the same length, the long side length of the patch C323, the long side length of the patch B322 and the patch D324, and the long side length of the patch A321 and the patch E325 increase successively.

[0022] In this embodiment, the short side length of all the patches 32 is 2.1 mm, the long side length of the patch A321 and the patch E325 is 2.34 mm, the long side length of the patch B322 and the patch D324 is 3.34 mm, and the long side length of the patch C323 is 3.78 mm.

[0023] In this embodiment, all the microstrip lines 31 are made of rectangular elongated copper foils with the same size.

[0024] In this embodiment, the short side length of the microstrip line 31 is 0.15 mm, and the long side length is 1.25 mm.

[0025] In this embodiment, the dielectric substrate 2 is made of Taconic RF-35.

[0026] In this embodiment, the metal floor 1, the array radiation unit 3, the coaxial inner core 4, the patch 32, the microstrip line 31 and the coupling feed line 5 are all made of copper.

[0027] The coaxial inner core 4 and the metal floor 1 jointly constitute a coaxial port for feeding microwave power to the present application, and the S11 parameter at the port obtained by simulation with CST Microwave Studio is shown in Figure 3 The S11<-15dB in the frequency range of 30.1-37.1GHz, and the relative bandwidth reaches 20.8%.

[0028] The antenna directional diagram of the present application at 6 typical frequency points (31.5, 32.5, 33.5, 34.5, 35.5 and 36.5GHz) obtained by simulation with CST Microwave Studio is shown in Figure 4 At each frequency point, the main lobe magnitude of the antenna directional diagram is more than 10dB, while the main lobe direction gradually changes from 56° to 11°, and the angle adjustment range reaches 45°. In addition, the side lobe level at each frequency point is less than -10dB. The above results show that the present application has strong directivity and anti-interference ability in a super-wide frequency range, and the detection direction is adjustable.

[0029] The above is only the preferred embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A miniaturized wideband mainlobe pointing adjustable microstrip array antenna, characterized by: The metal floor, the medium substrate attached to the upper surface of the metal floor, the array radiation unit printed on the upper surface of the medium substrate, and the coaxial inner core penetrating through the metal floor and the medium substrate; the array radiation unit includes one or more groups of patches connected in series through microstrip lines, and the head patch is connected with the coaxial inner core through a coupling feeder; the patch includes five groups of patches A, B, C, D and E connected in sequence, and the five groups of patches are connected in sequence through microstrip lines A, B, C and D; all the patches are rectangular copper foil, all the patches have the same short side length, the long side length of the patch A and the patch E and the long side length of the patch B and the patch D are the same, and the long side length of the patch C, the long side length of the patch B and the patch D and the long side length of the patch A and the patch E increase in turn; the short side length of all the patches is 2.1mm, the long side length of the patch A and the patch E is 2.34mm, the long side length of the patch B and the patch D is 3.34mm, and the long side length of the patch C is 3.78mm.

2. The adjustable microstrip array antenna of claim 1, wherein: All the microstrip lines are rectangular slender copper foils with the same size.

3. The adjustable microstrip array antenna of claim 1, wherein: The short side length of the microstrip line is 0.15mm, and the long side length is 1.25mm.

4. The adjustable microstrip array antenna of claim 1, wherein: The material of the medium substrate is Taconic RF-35.

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