CN117525877A - Low-profile end-fire antenna capable of being mounted on metal surface - Google Patents

Abstract

The invention discloses a low-profile end-fire antenna capable of being mounted on a metal surface, wherein the antenna is in a single-layer microstrip circuit board form, a main radiation unit is arranged on a dielectric plate, and the main radiation unit forms two radiation in opposite directions after being fed; the two parasitic radiation units are arranged on two sides of the main radiation unit and play a role in auxiliary radiation, and meanwhile, the working bandwidth of the whole antenna is widened; the main radiation unit and the parasitic radiation unit are provided with metallized through holes to inhibit unnecessary modes, so that the whole antenna is beneficial to forming two radiation in opposite directions; the ten mushroom units form a reflecting structure, and reflect and inhibit radiation in one direction, so that the whole antenna has unidirectional end-fire radiation characteristics; the feed takes the form of a coaxial bottom feed with a feed point located on the centre line of the main radiating element. The invention realizes the broadband end-fire antenna which can be arranged on the metal surface under certain low-profile condition, and provides good antenna selection for application occasions such as aerial platforms and the like.

Description

Low-profile end-fire antenna capable of being mounted on metal surface

Technical Field

The invention belongs to the technical field of antennas, and particularly relates to a low-profile end-fire antenna capable of being mounted on a metal surface.

Background

The end-fire antenna is widely applied to the military and civil fields, and related researches are also more. Many end-fire antennas are often used in air environment, but in practical engineering, the antennas are often required to be arranged on metal surfaces, and many antennas used in air environment are often not suitable for being used on metal surfaces. There are also end-fire antennas that can be mounted on metal surfaces, which tend to have a narrow operating bandwidth, which adversely affects their application. Also, some end-fire antennas may be mounted on metal surfaces, but their profile tends to be high, which is detrimental to the application of the antenna on aerial platforms.

Disclosure of Invention

The invention aims to solve the problems that a general end-fire antenna is narrow in bandwidth and high in section and is difficult to use on a metal surface, and provides a low-section microstrip end-fire antenna based on a mushroom structure. The antenna has wider bandwidth, can be arranged on a metal surface for use, and provides good choice for the implementation of end-fire antennas in application occasions such as aerial platforms and the like.

In order to achieve the purpose of the invention, the invention discloses a low-profile end-fire antenna which can be installed on the metal surface, wherein the antenna adopts a single-layer microstrip circuit board form and comprises a dielectric plate, a main radiating unit, a parasitic radiating unit, a reflecting structure and a feed structure; the main radiation unit is arranged on the dielectric plate and forms two radiation in opposite directions after feeding; the two parasitic radiation units are arranged on two sides of the main radiation unit and play a role in auxiliary radiation, and meanwhile, the working bandwidth of the whole antenna is widened; the main radiation unit and the parasitic radiation unit are provided with metallized through holes to inhibit unnecessary modes, so that the whole antenna is beneficial to forming two radiation in opposite directions; ten mushroom units are arranged on the other side of the main radiation unit, and form a reflection structure to reflect and inhibit radiation in one direction, so that the whole antenna forms a unidirectional end-emission radiation characteristic; the feed takes the form of a coaxial bottom feed with a feed point located on the centre line of the main radiating element.

Further, the dielectric plate was a plate having a dielectric constant of 2.2, a loss tangent of 0.0009 and a thickness of 2 mm.

Further, the length and width of the main radiating element are 11mm and 10mm respectively; the feed point is located on the transverse centre line of the main radiating element at a distance h=2.5 mm from one side of the element, and two further metallized vias are located at both ends of the centre line.

Further, the intervals between the two parasitic radiating elements and the main radiating element are respectively 10.5mm and 8.5mm, and each parasitic radiating element is provided with two metalized via holes at two ends of the transverse center line.

Further, each mushroom structure is composed of a positive direction patch with a side length of 8mm and a metallized via hole in the center, and the spacing between adjacent mushroom cells is 1mm.

Compared with the prior art, the invention has the remarkable progress that: the broadband end-fire antenna which can be arranged on the metal surface for use is realized under a certain low-profile condition, and good antenna selection is provided for application occasions such as an aerial platform and the like.

In order to more clearly describe the functional characteristics and structural parameters of the present invention, the following description is made with reference to the accompanying drawings and detailed description.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

fig. 1 is a top view of an antenna of the present invention;

fig. 2 is a side view of an antenna of the present invention;

FIG. 3 is a schematic diagram of two equivalent magnetic currents on either side of the main radiating element;

fig. 4 is a radiation pattern of the antenna without the mushroom structure;

fig. 5 is a radiation pattern of the antenna with a mushroom structure;

s11 schematic diagram of the antenna of fig. 6;

fig. 7.3 ghz E-plane pattern (phi=0°);

fig. 8, xoy-plane pattern at 5.3ghz (θ=50°).

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in FIGS. 1 and 2, the dielectric plate was a plate having a dielectric constant of 2.2, a loss tangent of 0.0009, and a thickness of 2 mm. The antenna is composed of a main radiating element, a parasitic radiating element, a reflecting structure, a feed structure and the like. The length and width of the main radiating element are c=11mm and e=10mm respectively; the feed point is located on the centre line of the main radiating element in the y direction, at a distance h=2.5 mm from one side of the element, and two further metallized vias are located at both ends of the centre line, which suppress some unwanted modes while allowing the main radiating element to form bi-directional radiation in the x direction. The interval between the two parasitic radiating elements and the main radiating element is f=0.15 mm, the length and the width are d=10.5 mm and g=8.5 mm respectively, and each parasitic radiating element is also provided with two metalized via holes at two ends of the central line. The two parasitic radiating elements act together with the main radiating element to broaden the operating band of the antenna. Two rows of reflecting arrays formed by 10 mushroom structures are arranged below the radiating units, and reflect and inhibit radiation of the antenna along the-x direction, so that the total effect of the whole antenna is radiation towards the +x direction, and unidirectional end-emitting radiation along the +x direction is formed. Each mushroom structure is composed of a positive direction patch with a side length of a=8mm and a metallized via hole in the center, and the adjacent mushroom cells are spaced apart by b=1mm.

As shown in fig. 3, the main radiating element forms an equivalent magnetic current diagram at two opposite sides, and the two equivalent magnetic currents are equal in size and opposite in direction.

As shown in fig. 4 and fig. 5, the antenna has a bidirectional end-fire property when the antenna has no mushroom structure; the antenna pattern with the mushroom structure is such that the antenna is only endfire in one direction.

As shown in FIG. 6, it can be seen from the figure that the bandwidth of S11< -10dB is greater than 600MHz.

Fig. 7 is an E-plane pattern at 5.3GHz (phi=0°), fig. 8 is an xoy-plane pattern at 5.3GHz (θ=50°), and fig. 7 and 8 show patterns at a typical operating frequency (5.3 GHz).

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. The low-profile end-fire antenna capable of being mounted on the metal surface is characterized in that the antenna is in a single-layer microstrip circuit board form and comprises a dielectric plate, a main radiating unit, a parasitic radiating unit, a reflecting structure and a feed structure; the main radiation unit is arranged on the dielectric plate and forms two radiation in opposite directions after feeding; the two parasitic radiation units are arranged on two sides of the main radiation unit and play a role in auxiliary radiation, and meanwhile, the working bandwidth of the whole antenna is widened; the main radiation unit and the parasitic radiation unit are provided with metallized through holes to inhibit unnecessary modes, so that the whole antenna is beneficial to forming two radiation in opposite directions; ten mushroom units are arranged on the other side of the main radiation unit, and form a reflection structure to reflect and inhibit radiation in one direction, so that the whole antenna forms a unidirectional end-emission radiation characteristic; the feed takes the form of a coaxial bottom feed with a feed point located on the centre line of the main radiating element.

2. The low profile end fire antenna mountable to a metal surface as in claim 1, wherein the dielectric plate is a sheet material having a dielectric constant of 2.2, a loss tangent of 0.0009 and a thickness of 2 mm.

3. A low profile end fire antenna mountable to a metal surface as claimed in claim 1, wherein the main radiating element is 11mm and 10mm long and wide respectively; the feed point is located on the transverse centre line of the main radiating element, at a distance of 2.5mm from one side of the element, and two further metallized vias are located at both ends of the centre line.

4. The low profile end fire antenna as in claim 1, wherein the two parasitic radiating elements are spaced from the main radiating element by 10.5mm and 8.5mm, respectively, each parasitic radiating element having two metallized vias positioned at each end of the transverse centerline.

5. A low profile end fire antenna mountable on a metal surface as claimed in claim 1, wherein each mushroom structure is formed by a positive directional patch of 8mm side length and a centrally metallised via, adjacent mushroom cells being spaced 1mm apart.