Low-profile ultra-wideband time domain antenna

Abstract

The invention discloses a low-profile ultra-wideband time-domain antenna, and the antenna comprises an installation platform which is provided with a rectangular metal cavity at a top opening position, and the rectangular metal cavity is used for transmitting or receiving electromagnetic waves; the antenna is arranged in the rectangular metal cavity, and the antenna is used for receiving or transmitting horizontally polarized electromagnetic waves; the antenna comprises an SSMA connector, a radiation metal sheet and a chip resistor, the SSMA connector is assembled on the radiation metal sheet, and the radiation metal sheet is provided with the chip resistor; a radiation main body of the radiation metal sheet is an asymmetric heterogeneous metal sheet, a feed matching groove, a structure transition groove and a radiation groove are arranged in the radiation main body, and the radiation main body is bent. The antenna is novel in structural form, simple and reliable, achieves the performances of ultra wide band, low profile, miniaturization, specific wave beam coverage range and the like, and has a wide popularization prospect.

Description

Technical Field

[0001] The present invention relates to the field of antennas, and in particular to a low-profile ultra-wideband time domain antenna. Background Art

[0002] In 2002, the Federal Communications Commission (Federal Communications Commission) defined the spectrum of ultra-wideband (UWB) signals as 3.1 GHz to 10.6 GHz. Antennas are key components for radiating and receiving energy in ultra-wideband wireless communication systems. Their performance requirements include extremely large impedance bandwidth, small size, easy conformality, and low processing costs.

[0003] A circular ultra-wideband antenna (Study of a Printed Circular Disk Monopole Antenna for UWB system) introduced in IEEE Transaction on Antenna and Propagation (2005, Issue 11, Pages 3500-3504) can fully cover the 3.1GHz-10.6GHz frequency band required for ultra-wideband wireless communications and has planar structural characteristics, but its appearance size is large, so it still has shortcomings in application.

[0004] IEEE Transaction on Antenna and Propagation (2007, Issue 2, Pages 383-387) discloses a small ultra-wideband antenna structure. However, since the antenna uses an unbalanced rectangular radiation unit and does not have good time domain characteristics, it has many inconveniences in practical applications. Summary of the invention

[0005] The purpose of the present invention is to provide a low-profile ultra-wideband time domain antenna with a simple and reliable structure, while achieving the performance of ultra-wideband, low profile, conformal, and specific beam coverage.

[0006] In order to achieve the above objectives, the present invention is implemented by the following technical solutions:

[0007] A low profile ultra-wideband time domain antenna, characterized by including:

[0008] The mounting platform is provided with a rectangular metal cavity at the top opening, and the rectangular metal cavity is used for transmitting or receiving electromagnetic waves;

[0009] An antenna is disposed in a rectangular metal cavity, and is used to receive or transmit horizontally polarized electromagnetic waves;

[0010] The antenna comprises an SSMA connector, a radiating metal sheet and a chip resistor, wherein the SSMA connector is mounted on the radiating metal sheet, and the radiating metal sheet is provided with a chip resistor;

[0011] The radiation metal sheet radiation body is an asymmetric heterogeneous metal sheet, which is provided with a feed matching slot, a structural transition slot and a radiation slot inside and is bent.

[0012] Furthermore, the antenna is installed at the center of the bottom of the rectangular metal cavity, and the top of the antenna is flush with the top of the metal cavity.

[0013] Furthermore, the inner wall of the rectangular metal cavity is coated with an absorbing material for absorbing excess electromagnetic waves of the antenna in the rectangular metal cavity.

[0014] Furthermore, the distance between the radiation metal sheet and the long side of the rectangular metal cavity is 5 mm, and the distance between the radiation metal sheet and the short side is greater than L / 4, where L is the length of the long side of the rectangular metal cavity.

[0015] Furthermore, the radiating metal sheet is bent, and the bending profile is an elliptical profile, so as to realize miniaturization of the antenna; the antenna height is the same as the depth of the rectangular metal cavity, which is H; the antenna width is W-10 mm, where W is the width of the rectangular metal cavity; the length of the antenna before bending is Lz, and the actual length of the antenna after bending is Lq; the antenna height H satisfies the following relationship:

[0016]

[0017] Furthermore, the feed matching slot includes a rectangular matching slot and an "L"-shaped feed slot; the structural transition slot is a trapezoidal structural slot, and enables structural transition between the feed matching slot and the radiation slot.

[0018] Furthermore, the connection between the structural transition groove and the radiation groove is chamfered to achieve a smooth transition between the structures.

[0019] Furthermore, the SSMA connector is assembled into the metal through-wall of the radiation metal sheet by means of screws, and after crossing the feed matching slot, contacts the radiation metal sheet.

[0020] Furthermore, a chip resistor is loaded on the "L"-shaped feeding slot in the feeding matching slot in the antenna.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] The low-profile ultra-wideband time domain antenna provided by the present invention has the following advantages: the structure is novel, simple and reliable, and at the same time achieves the performance of ultra-wideband, low profile, conformal, specific beam coverage range, etc., can be applied to ultra-wideband wireless communication systems, and has broad promotion prospects in the current field of antenna technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a low-profile ultra-wideband time domain antenna of the present invention;

[0024] Figure 2 It is a parts exploded view of a low-profile ultra-wideband time domain antenna of the present invention;

[0025] Figure 3 It is a structural schematic diagram of the antenna unit of the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of the feeding part of the antenna unit of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

[0028] like Figure 1 , Figure 2 , Figure 3 As shown, the present invention is a low-profile ultra-wideband time domain antenna, comprising: a mounting platform 1; a rectangular metal cavity 11 is provided at the top opening position for transmitting or receiving electromagnetic waves; the bottom surface of the mounting platform 1 contains two threaded holes 12 for installing the antenna 3; the inner wall of the rectangular metal cavity 11 is covered with an absorbing material 2 for absorbing the excess electromagnetic waves of the antenna 3 on the five sides of the rectangular metal cavity 11. The antenna 3 is composed of an SSMA connector 31, a radiating metal sheet 32 ​​and a patch resistor 33, and the antenna array receives or transmits horizontally polarized electromagnetic waves; the radiating metal sheet 32 ​​is an asymmetric heterogeneous Vivaldi metal sheet, which contains a feed matching slot 321, a structural transition slot 322 and a radiating slot 323, and is bent, and the bending profile is an elliptical profile feature.

[0029] like Figure 1 , Figure 2 As shown, in this embodiment, specifically, the antenna 3 is installed at the center of the rectangular metal cavity 11, and the antenna 3 is fixed to the threaded hole on the bottom surface of the metal cavity by a pan head screw 34, and the top of the antenna is flush with the top of the metal cavity. The inner wall of the mounting platform 1 is covered with absorbing material 2. The distance between the radiation metal sheet 32 ​​and the long side of the rectangular metal cavity 11 is 5mm, and the distance between the radiation metal sheet 32 ​​and the short side must be greater than L / 4, where L is the length of the long side of the rectangular metal cavity 11. The thickness of the radiation metal sheet 2 is 4mm.

[0030] Furthermore, the radiating metal sheet 32 ​​is bent, and the bending line is an elliptical line feature, so as to realize the miniaturization of the antenna; the antenna height is the same as the depth of the rectangular metal cavity 11, which is H, and the antenna width is (W-10) mm, where W is the width of the rectangular metal cavity 11. The length of the antenna before bending is Lz, and the actual length of the antenna after bending is Lq, and the antenna height H satisfies the relationship:

[0031]

[0032] like Figure 4 As shown, the radiation slot 323 in the antenna 3 adopts an exponential gradient structure for impedance matching, and the exponential coefficients of the exponential curves on both sides are not equal.

[0033] Furthermore, the feed matching slot 321 in the antenna is composed of a rectangular matching slot and an "L"-shaped feed slot. The structural transition slot 322 is a trapezoidal structural slot, which realizes the structural transition between the feed matching slot 321 and the radiation slot 323. The connection between the structural transition slot 322 and the radiation slot 323 is rounded and chamfered to achieve a smooth transition between the structures. The integrated design of the feed matching slot 321, the structural transition slot 322 and the radiation slot 323 in the antenna realizes the impedance matching of the antenna in an ultra-wide frequency band.

[0034] In a preferred embodiment, the SSMA connector 31 of the antenna 3 is assembled into the metal through-wall of the radiation metal sheet 32 ​​by means of screws 35, and contacts the radiation metal sheet 32 ​​after crossing the feed matching slot 321, and the connector pin adopts a ball head structure.

[0035] In a preferred embodiment, a chip resistor 33 is loaded on the "L"-shaped feeding slot in the feed matching slot 321 in the antenna, and the resistance value is a specific resistance value. The distance between the chip resistor 33 and the corner of the "L"-shaped feeding slot is 1.5 mm.

[0036] To sum up, the low-profile ultra-wideband time domain antenna provided by the present invention has the following advantages: the structure is novel, simple and reliable, and at the same time it realizes the performance of ultra-wideband, low profile, conformal, specific beam coverage range, etc. It can be applied to ultra-wideband wireless communication systems and has broad promotion prospects in the current field of antenna technology.

[0037] It should be noted that, in the embodiments of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A low-profile ultra-wideband time domain antenna, characterized in that: include: The mounting platform is provided with a rectangular metal cavity at the top opening, and the rectangular metal cavity is used for transmitting or receiving electromagnetic waves; An antenna is disposed in a rectangular metal cavity, and is used to receive or transmit horizontally polarized electromagnetic waves; The antenna comprises an SSMA connector, a radiating metal sheet and a chip resistor, wherein the SSMA connector is mounted on the radiating metal sheet, and the radiating metal sheet is provided with a chip resistor; The radiation metal sheet radiation body is an asymmetric heterogeneous metal sheet, which is provided with a feed matching slot, a structural transition slot and a radiation slot inside and is bent.

2. The low-profile ultra-wideband time domain antenna according to claim 1, characterized in that: The antenna is installed at the center of the bottom of the rectangular metal cavity, and the top of the antenna is flush with the top of the metal cavity.

3. The low-profile ultra-wideband time domain antenna according to claim 1, characterized in that: The inner wall of the rectangular metal cavity is pasted with absorbing material to absorb the excess electromagnetic waves of the antenna in the rectangular metal cavity.

4. The low-profile ultra-wideband time domain antenna according to claim 1, characterized in that: The distance between the radiation metal sheet and the long side of the rectangular metal cavity is 5 mm, and the distance between the radiation metal sheet and the short side is greater than L / 4, where L is the length of the long side of the rectangular metal cavity.

5. The low-profile ultra-wideband time domain antenna according to claim 1, characterized in that: The radiating metal sheet is bent, and the bending line is an elliptical line feature, so as to realize the miniaturization of the antenna; the antenna height is the same as the depth of the rectangular metal cavity, which is H, the antenna width is W-10mm, W is the width of the rectangular metal cavity, the length of the antenna before bending is Lz, the actual length of the antenna after bending is Lq, and the antenna height H satisfies the following relationship:

6. The low-profile ultra-wideband time domain antenna according to claim 1, characterized in that: The feed matching slot includes a rectangular matching slot and an "L"-shaped feed slot; The structural transition slot is a trapezoidal structural slot, and enables structural transition between the feed matching slot and the radiation slot.

7. The low-profile ultra-wideband time domain antenna according to claim 1, characterized in that: The connection between the structural transition groove and the radiation groove is chamfered to achieve a smooth transition between the structures.

8. The low-profile ultra-wideband time domain antenna according to claim 1, characterized in that: The SSMA connector is assembled into the metal through-wall of the radiation metal sheet by means of screws, and contacts the radiation metal sheet after crossing the feed matching slot.

9. The low-profile ultra-wideband time domain antenna according to claim 1, characterized in that: A chip resistor is loaded on the "L"-shaped feeding slot in the feeding matching slot in the antenna.

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