Low-profile invertible antenna

Abstract

The utility model belongs to the field of antennas, and particularly relates to a low-profile invertible antenna. Comprising a shell (1), a dielectric substrate (2), a radiation unit (3) and a coaxial connector (4), the radiation unit (3) and the coaxial connector (4) are arranged on the dielectric substrate (2), the shell (1) is provided with an upper large face, a lower large face and a narrow side face, the dielectric substrate (2) is perpendicular to the upper large face and the lower large face of the shell (1), and the radiation unit (3) comprises an upper radiation patch (5), a lower radiation patch (6), a short circuit patch (7), an upper feed patch (8) and a lower feed patch (9). The upper radiation patch (5) and the lower radiation patch (6) are connected through the short circuit patch (7), the upper feed patch (8) is connected with the upper radiation patch (5), the lower feed patch (9) is connected with the lower radiation patch (6), and the coaxial connector (4) is connected with the upper feed patch (8) and the lower feed patch (9).

Description

Technical Field

[0001] This utility model belongs to the field of antennas, specifically relating to a low-profile invertible antenna. Background Technology

[0002] With the development of the aviation industry, how to quickly locate the flight data recorder of a crashed aircraft at sea or in remote areas has become an urgent problem to be solved. A jettisonable recorder can detach from the aircraft during a crash, landing on the ground or water and transmitting emergency radio signals. The main frequencies for these emergency radio signals are 121.5MHz, 243MHz, and 406MHz. Generally, emergency radio antennas use large whip antennas or saber antennas, which cannot be installed inside the jettisonable recorder's casing. Such antennas are easily damaged during an aircraft crash. Furthermore, if the jettisonable recorder lands with its antenna pointing downwards, the signal will be blocked by the recorder itself. Utility Model Content

[0003] Purpose of the utility model: To provide a low-profile invertible antenna to meet the needs of a throwable recorder.

[0004] Technical solution:

[0005] A low-profile invertible antenna includes: a housing 1, a dielectric substrate 2, a radiating element 3 disposed on the dielectric substrate 2, and a coaxial connector 4. The housing 1 has two large surfaces, an upper surface and a narrow side surface. The dielectric substrate 2 is placed perpendicular to the upper surface and the lower surface of the housing 1. The radiating element 3 includes an upper radiating patch 5, a lower radiating patch 6, a short-circuit patch 7, an upper feed patch 8, and a lower feed patch 9. The upper radiating patch 5 and the lower radiating patch 6 are connected by the short-circuit patch 7. The upper feed patch 8 is connected to the upper radiating patch 5, and the lower feed patch 9 is connected to the lower radiating patch 6. The coaxial connector 4 is connected to the upper feed patch 8 and the lower feed patch 9.

[0006] Furthermore, the upper radiating patch 5 and the lower radiating patch 6 are symmetrical shapes.

[0007] Furthermore, the upper radiating patch 5 and the lower radiating patch 6 have one or more rectangular slots 10.

[0008] Furthermore, the length of the radiation patch is 50mm to 300mm.

[0009] Furthermore, the width of the radiation patch is 5mm to 20mm.

[0010] Furthermore, the width of the rectangular slot is 2mm to 15mm.

[0011] Furthermore, the short-circuit patch 7 has a length of 5mm to 50mm.

[0012] Furthermore, the width of the short-circuit patch 7 is 5mm to 20mm.

[0013] Furthermore, the distance between the power supply patch and the short-circuit patch 7 is 1mm to 20mm.

[0014] Furthermore, the thickness of the dielectric substrate 2 is 0.1 mm to 3 mm.

[0015] Beneficial effects:

[0016] The antenna of this invention features a low profile and invertibility through the radiating patch slotting, bending, and symmetrical design. The antenna dielectric substrate of this invention uses a thin epoxy glass cloth plate or polyimide film, which effectively reduces the size and weight of the antenna. The antenna structure of this invention is simple and effectively reduces production costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the antenna of this utility model.

[0018] Figure 2 This is a schematic diagram of the radiating element of the antenna of this utility model when the operating frequency is 243MHz.

[0019] Figure 3 This is a schematic diagram of the dimensions of the radiating element when the antenna of this utility model operates at a frequency of 243MHz.

[0020] Figure 4 This is a simulation result diagram of the antenna of this utility model operating at a frequency of 243MHz.

[0021] Figure 5 This is a schematic diagram of the dimensions of the radiating element when the antenna of this utility model operates at a frequency of 121.5MHz.

[0022] Figure 6 This is a schematic diagram of the radiating element when the antenna of this utility model operates at a frequency of 121.5MHz.

[0023] Figure 7 This is a simulation result diagram of the antenna of this utility model operating at a frequency of 121.5MHz.

[0024] Figure 8 This is a schematic diagram of the radiating element of the antenna of this utility model when the operating frequency is 406MHz.

[0025] Figure 9 This is a schematic diagram of the dimensions of the radiating element when the antenna of this utility model operates at a frequency of 406MHz.

[0026] Figure 10 This is a simulation result diagram of the antenna of this utility model operating at a frequency of 406MHz. Detailed Implementation

[0027] A low-profile invertible antenna includes: a housing 1, a dielectric substrate 2, radiating elements 3 disposed on the dielectric substrate 2, and a coaxial connector 4. The radiating element 3 consists of an upper radiating patch 5, a lower radiating patch 6, a short-circuit patch 7, an upper feed patch 8, and a lower feed patch 9. The upper radiating patch 5 and the lower radiating patch 6 are connected via the short-circuit patch 7. The upper feed patch 8 is connected to the upper radiating patch 5, and the lower feed patch 9 is connected to the lower radiating patch 6. The coaxial connector 4 is connected to the upper feed patch 8 and the lower feed patch 9. The upper radiating patch 5 and the lower radiating patch 6 are symmetrical. Each of the upper and lower radiating patches has one or more rectangular slots 10. The housing 1 is made of a composite material such as epoxy glass, aramid, or PBO. The radiating element 3 is made of a metal such as copper, tin, nickel, or gold. The length L1 of the radiating patch is 50mm to 300mm. The width W1 of the radiating patch is 5mm to 20mm. The width of the rectangular slot W2 is 2mm to 15mm. The length L3 of the short-circuit patch 7 is 5mm to 50mm. The width W3 of the short-circuit patch 7 is 5mm to 20mm. The distance L4 between the feed patch and the short-circuit patch 7 is 1mm to 20mm. The thickness h of the dielectric substrate 2 is 0.1mm to 3mm. The thickness h of the radiating element 3 is 0.01mm to 0.1mm. Increasing the length of the radiating patch and the number of rectangular slots will decrease the antenna operating frequency; increasing the width of the radiating patch and the width of the rectangular slots can increase the antenna operating bandwidth. Adjusting the distance between the feed patch and the short-circuit patch can adjust the antenna matching impedance, making the antenna impedance close to 50 ohms.

[0028] The structural principle of this utility model will be further explained below.

[0029] See Figure 1 This utility model discloses a low-profile invertible antenna, comprising: a housing 1, a dielectric substrate 2, a radiating element 3 disposed on the dielectric substrate 2, and a coaxial connector 4. The housing 1 has two large surfaces (top and bottom) and a narrower side surface. The dielectric substrate 2 is placed perpendicular to the two large surfaces of the housing 1. When the recorder is thrown and lands, either the top or bottom surface will touch the ground, and the antenna dielectric substrate 2 will be perpendicular to the ground, either upright or inverted. The housing 1 is made of epoxy glass composite material, capable of transmitting electromagnetic waves. The gap between the housing 1 and the dielectric substrate 2 can be filled with lightweight polyurethane foam.

[0030] See Figure 2 and Figure 3When the antenna operates at a frequency of 243MHz, the dielectric substrate 2 is a 0.8mm thick epoxy glass cloth board. The radiating element 3 is a 0.035mm thick copper foil. The coaxial connector 4 is an SMA socket. The radiating element 3 consists of an upper radiating patch 5, a lower radiating patch 6, a short-circuit patch 7, an upper feed patch 8, and a lower feed patch 9. The upper radiating patch 5 and the lower radiating patch 6 each have a rectangular slot 10, with a slot width W2 of 8 mm and a slot length L2 of 155 mm. The radiating patch after slotting has a length L1 of 170 mm and a width W1 of 15 mm. The upper radiating patch 5 and the lower radiating patch 6 are symmetrical and connected by a shorting patch 7. The shorting patch 7 has a length L3 of 14 mm and a width W3 of 15 mm. The upper feed patch 8 is connected to the upper radiating patch 5, and the lower feed patch 9 is connected to the lower radiating patch 6. The distance L4 between the feed patch and the shorting patch 7 is 6 mm. The coaxial connector 4 is connected to the upper feed patch 8 and the lower feed patch 9. Because the radiating patches have a symmetrical structure, electromagnetic simulation shows that the radiation gain does not change significantly when the antenna is placed upwards or downwards. The radiation gain is greater than -4 dBi within the antenna's elevation angle range of 5° to 20° (see [reference]). Figure 4 This meets the antenna radiation performance requirements of a throw-type recorder.

[0031] See Figure 5 and Figure 6 When the antenna operates at a frequency of 121.5MHz, the dielectric substrate 2 is a 0.2mm thick polyimide film, and a 0.8mm thick epoxy glass cloth reinforcing plate 11 is attached to the back of the dielectric substrate 2. The radiating element 3 is a 0.035mm thick copper foil. The dielectric substrate 2 and the radiating element 3 are assembled according to... Figure 6 After bending the dotted line at a 90° angle, it forms... Figure 7 Shape. The upper radiating patch 5 and lower radiating patch 6 of radiating element 3 each have four rectangular slots 10, with a slot width W2 of 7.5 mm and a slot length L2 of 195 mm; the length L1 of the slotted radiating patch is 205 mm, and the width W1 is 10 mm; the length L3 of the short-circuit patch 7 is 10 mm, and the width W3 is 10 mm; the distance L4 between the feed patch and the short-circuit patch 7 is 11 mm. Electromagnetic simulation shows that when the antenna is placed upwards and downwards, the radiation gain does not change significantly, and the radiation gain is greater than -4 dBi within the antenna's elevation angle range of 5° to 20° (see...). Figure 7 This meets the antenna radiation performance requirements of a throw-type recorder.

[0032] See Figure 8 and Figure 9When the antenna operates at a frequency of 406MHz, the dielectric substrate 2 is a 0.8mm thick epoxy glass cloth board. The radiating element 3 is a 0.035mm thick copper foil. The coaxial connector 4 is an SMA socket. The radiating element 3 consists of an upper radiating patch 5, a lower radiating patch 6, a short-circuit patch 7, an upper feed patch 8, and a lower feed patch 9. The length L1 of the radiating patch is 153mm, and the width W1 is 13mm; the length L3 of the short-circuit patch 7 is 36mm, and the width W3 is 13mm; the distance L4 between the feed patch and the short-circuit patch 7 is 5mm. Through electromagnetic simulation, when the antenna is placed upwards and downwards, there is no significant change in radiation gain, and the radiation gain is greater than -2dBi in the range of antenna elevation angle from 10° to 50° (see...). Figure 10 This meets the antenna radiation performance requirements of a throw-type recorder.

[0033] In summary, the antenna of this invention, through the slotting, bending, and symmetrical design of the radiating patch, has the characteristics of low profile and invertibility. The antenna dielectric substrate of this invention uses a thin epoxy glass cloth plate or polyimide film, which effectively reduces the size and weight of the antenna. The antenna structure of this invention is simple and effectively reduces production costs.

[0034] This invention comprises a housing, a dielectric substrate, a radiating element disposed on the dielectric substrate, and a coaxial connector. The radiating element consists of an upper radiating patch, a lower radiating patch, a short-circuit patch, an upper feed patch, and a lower feed patch. The upper and lower radiating patches are connected by the short-circuit patch, and the coaxial connector connects to the upper and lower feed patches. The upper and lower radiating patches have rectangular slots, increasing the effective current path and reducing the antenna profile height. The upper and lower radiating patches are symmetrical, so inverted placement does not affect the antenna's radiation gain. This antenna achieves miniaturization, low profile, invertibility, and low-cost design.

Claims

1. A low-profile invertible antenna, characterized in that, include: The enclosure (1), dielectric substrate (2), radiating unit (3) disposed on dielectric substrate (2), and coaxial connector (4) are provided. The enclosure (1) has two large surfaces, an upper surface and a narrow side surface. The dielectric substrate (2) is placed perpendicular to the upper surface and the lower surface of the enclosure (1). The radiating unit (3) includes an upper radiating patch (5), a lower radiating patch (6), a short-circuit patch (7), an upper power feeding patch (8), and a lower power feeding patch (9). The upper radiating patch (5) and the lower radiating patch (6) are connected by the short-circuit patch (7). The upper power feeding patch (8) is connected to the upper radiating patch (5). The lower power feeding patch (9) is connected to the lower radiating patch (6). The coaxial connector (4) is connected to the upper power feeding patch (8) and the lower power feeding patch (9).

2. The low-profile invertible antenna according to claim 1, characterized in that, The upper radiating patch (5) and the lower radiating patch (6) are symmetrical shapes.

3. The low-profile invertible antenna according to claim 1, characterized in that, The upper radiating patch (5) and the lower radiating patch (6) have one or more rectangular slots (10).

4. The low-profile invertible antenna according to claim 1, characterized in that, The length of the radiation patch is 50mm to 300mm.

5. The low-profile invertible antenna according to claim 1, characterized in that, The width of the radiation patch is 5mm to 20mm.

6. The low-profile invertible antenna according to claim 3, characterized in that, The width of the rectangular slot is 2mm to 15mm.

7. The low-profile invertible antenna according to claim 1, characterized in that, The short-circuit patch (7) has a length of 5mm to 50mm.

8. The low-profile invertible antenna according to claim 1, characterized in that, The width of the short-circuit patch (7) is 5mm to 20mm.

9. A low-profile invertible antenna according to claim 1, characterized in that, The distance between the power supply patch and the short-circuit patch (7) is 1mm to 20mm.

10. A low-profile invertible antenna according to claim 1, characterized in that, The thickness of the dielectric substrate (2) is 0.1 mm to 3 mm.

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