CN101916913A - A UWB Microstrip Patch Antenna - Google Patents

Abstract

An ultra-broadband microstrip patch antenna for a communication system, comprising an elliptical patch connected with a coaxial feeding probe, a rectangular cut corner patch whose central part is hollowed out; the elliptical patch is located at the rectangular cut The hollowed out part of the corner patch, the hollowed out part of the rectangular corner patch is an ellipse structure, and the elliptical patch and the rectangular corner patch are placed on the surface of the same substrate; the antenna adopts an elliptical slot coupling structure to increase the surface current The path length on a rectangular cut-off patch to reduce antenna size. The elliptical slot-coupled ultra-broadband microstrip patch antenna has the advantages of small size, low cost, and easy processing and manufacturing, and can block the charge storage of DC interference signals on the rectangular cut-off patch through slot coupling, improving the anti-interference of the antenna ability.

Description

A UWB Microstrip Patch Antenna

technical field

The invention relates to a microstrip antenna used in a communication system, in particular to an ultra-wideband microstrip patch antenna with an elliptical slot coupling structure.

Background technique

With the rapid development of radar, precision guidance, remote sensing and radio communication industries, the need for wide-band, miniaturized microstrip patch antennas is becoming more and more urgent. Among various methods to expand the bandwidth of the microstrip antenna and reduce the size of the antenna, the method of slotting the patch antenna has been widely used.

Two authors T.Huynh and K.-F.Lee proposed a U-shaped slot microstrip patch antenna in "Electronics Letters" Volume 31 No. 16 in 1995 (T.Huynh and K.-F.Lee , Single-layer single-patch wideband microstrip antenna, Electronics Letters, 1995, 31(16): 1310-1312), Tong Yun and other four authors proposed a local U-shaped slot microstrip patch antenna with copper foil plus dielectric layer and mostly air layer. The improved patch antenna still has the problem of large external dimensions, which is different from the miniaturization of devices in satellite communication and mobile communication applications. The request was not met.

Contents of the invention

The present invention aims at the deficiencies in the prior art, and proposes an ultra-wideband microstrip patch antenna fed by a coaxial probe. The antenna adopts an elliptical slot coupling structure to increase the path length of the surface current on the microstrip patch antenna at a low-frequency resonance point. , in order to achieve the purpose of reducing the resonant frequency and reducing the size of the antenna. Under the same operating frequency and bandwidth, the size of the U-shaped rectangular patch antenna with a local copper foil plus a dielectric layer and most of the air layer is at least reduced. 13% smaller.

The present invention adopts following technical scheme:

An elliptical slot coupled ultra-broadband microstrip patch antenna for a communication system, comprising an elliptical patch connected with a coaxial feeding probe, and a rectangular corner-cut patch whose central part is hollowed out. The elliptical patch is located in the hollowed out part of the rectangular corner-cut patch, the figure of the hollowed-out part of the rectangular corner-cut patch is an ellipse, and the elliptical patch and the rectangular corner-cut patch are placed on the upper surface of the same substrate. The ellipse cut hole of the rectangular cut corner patch and the center of the ellipse patch are both located on the longitudinal axis of the rectangular cut corner patch. The two centers are not at the same point, and there is a gap between the two ellipses. The major axes of are located in the horizontal direction, parallel to the upper and lower edges of the rectangular corner-cut patch. The left and right corners of the lower side of the rectangular corner-cut patch are cut off, and the size of the cut part is the same, and the left-right symmetry is centered on the longitudinal axis of the rectangular corner-cut patch.

The beneficial effect of the present invention is that the elliptical slot coupling microstrip patch antenna adopts the elliptical slot coupling structure to increase the path length of the surface current on the antenna patch, reduce the size of the antenna, and realize miniaturization. At the same time, through the slot coupling method, the charge storage of the DC interference signal on the rectangular cut-off patch is blocked, and the anti-interference ability of the antenna is improved.

Description of drawings

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

Fig. 1 is a top view of the ultra-wideband microstrip patch antenna of the present invention.

Fig. 2 is a front view of the ultra-wideband microstrip patch antenna of the present invention.

Fig. 3 is a simulation and test diagram of the input reflection loss in the frequency band of the ultra-wideband microstrip patch antenna of the present invention.

In the figure: 10-ultra-broadband microstrip patch antenna, 20-dielectric plate, 11-rectangular corner-cut patch whose center part is hollowed out, 111-left side of rectangular corner-cut patch 11, 112-rectangular corner-cut patch 11's upper side, 113-the right side of the rectangular corner-cutting patch 11, 114-the lower right cornering edge of the rectangular corner-cutting patch 11, 115-the lower side of the rectangular corner-cutting patch 11, 116-the lower left side of the rectangular corner-cutting patch 11 Cutting edge, 12-ellipse patch, 121-feed point of coaxial probe on ellipse patch, 30-coaxial probe, 40-ground plate, 50-coaxial feed ground terminal.

Detailed ways

Fig. 1 is the top view of the elliptical slot coupling ultra-wideband microstrip patch antenna 10 proposed by the present invention, and Fig. 2 is the front view of the elliptical slot coupling ultra-wideband microstrip patch antenna 10, and the ultra-wideband microstrip patch antenna 10 is placed in a medium On the board 20, it is a left-right symmetrical structure, including a rectangular cut-off patch 11 and an ellipse patch 12 whose central part is hollowed out. The centers of the sheets 12 are all located on the longitudinal central axis of the rectangular corner-cut patch 11, but the two centers are not at the same point, and the long axis is parallel to the upper and lower sides of the rectangular corner-cut patch 11, and there is a gap between the two ellipses. It should be noted that the hollowed-out portion of the rectangular corner-cut patch 11 is limited to the rectangular corner-cut patch 11 itself.

The rectangular corner-cut patch 11 whose central part is hollowed out includes a left side 111 , an upper side 112 , a right side 113 , a lower right corner-cut side 114 , a lower side 115 and a left lower corner-cut side 116 . The right lower corner cutting edge 114 is the same size as the left lower corner cutting edge 116 , and is located on both sides of the longitudinal central axis of the rectangular corner cutting patch 11 , and is left-right symmetrical. The rectangular corner-cut patch 11 and the elliptical patch 12 are coupled through a middle gap to realize impedance matching.

The elliptical patch 12 is placed horizontally, and the long axis is parallel to the upper and lower sides of the rectangular patch 11 with cut corners. The patch 11 performs slot coupling to achieve impedance matching.

The elliptical slot coupled ultra-broadband microstrip patch antenna 10 is placed on the upper surface of the dielectric plate 20, the air is between the lower surface of the dielectric plate 20 and the ground plate 40, the thickness of the dielectric plate 20 is uniform, and the gap between the dielectric plate 20 and the ground plate 40 is The air layer is uniform, the thickness is the same everywhere, and the dielectric plate 20 is parallel to the ground plate 40.

The signal enters the elliptical patch 12 through the feeding point 121 of the coaxial probe 30 on the elliptical patch 12, and then utilizes the elliptical slot coupling to achieve impedance matching with the rectangular chamfered patch 11. The floors 40 are connected.

A preferred embodiment of the present invention is that the dielectric constant of the substrate 20 is 3.2, the thickness is 1.14 mm, and the tangent loss is 0.003. The substrate 20 is parallel to the ground plate 40, and there is an air layer between the substrate 20 and the ground plate 40, and the thickness is 10mm; the overall structure of this elliptical slot coupled ultra-broadband microstrip patch antenna 10 is left-right symmetric with the longitudinal central axis of the rectangular cut-off patch 11, and the left side 111 and the right side 113 of the rectangular cut-angle patch 11 have a length of 27.3mm, the length of the upper side 112 of the rectangular corner-cut patch 11 is 80mm, and the length of the lower side 115 of the rectangular corner-cut patch 11 is 40mm, because the right lower corner edge 114 and the left lower corner edge 116 of the rectangular corner-cut patch 11 It is a symmetrical structure. Let’s take the lower right corner 114 as an example below. The vertical distance from the intersection point of the right lower corner 114 and the right side 113 of the rectangular corner patch 11 to the lower side 115 is 9.7mm, and the lower right corner 115 and the right lower corner 114 The vertical distance from the intersection point to the right side 113 is 20mm; the hollowed-out part of the rectangular corner-cut patch 11 is an elliptical figure, and its center is located on the longitudinal central axis of the rectangular corner-cut patch 11, and the long axis is in line with the rectangular corner-cut patch 11 The vertical distance between the center of the elliptical cut hole and the lower side 115 of the rectangular cut patch 11 is 16mm, the length of the major semi-axis is 18mm, and the length of the minor semi-axis is 12.6mm; On the longitudinal central axis of the corner patch 11, its major axis is parallel to the upper and lower sides of the rectangular corner-cut patch 11, the vertical distance between the center of the circle and the lower edge 115 of the rectangular corner-cut patch 11 is 10mm, and the length of the major semi-axis is 8mm, short The length of the semi-axis is 2.4mm; the feeding point 121 of the coaxial probe 30 on the elliptical patch 12 is located on the longitudinal axis of the rectangular patch 11, and the vertical distance from the lower edge 115 of the rectangular patch 11 is 9.04mm.

The central working frequency of the patch antenna is 2.7GHz, the input reflection loss is less than -10dB in the frequency band 2.11GHz-3.30GHz, and the relative impedance bandwidth of the antenna reaches 44%.

FIG. 3 is a simulation and test diagram of the input reflection loss of the elliptical slot coupling ultra-wideband microstrip patch antenna 10 proposed by the present invention. As can be seen from Fig. 3, the ultra-wideband microstrip patch antenna 10 in the embodiment of the present invention has a good input return loss effect, and it can be observed from the curve |S11| that the absolute value of the input return loss in the ultra-wideband frequency band range is greater than 10, while Outside the passband frequency band, the absolute value of signal input reflection loss is less than 10. This shows that the elliptical slot coupled ultra-wideband microstrip patch antenna 10 has a good impedance matching effect in the selected frequency band.

Claims (3)

1. An ultra-broadband microstrip patch antenna, which is characterized in that it comprises an elliptical patch connected with a coaxial feed probe, a hollowed-out rectangular patch with cut corners, and the elliptical patch is located at a rectangular cut corner The hollowed out part of the patch, the figure of the hollowed out part of the rectangular corner-cut patch is an ellipse, and the elliptical patch and the rectangular corner-cut patch are located on the upper surface of the same substrate. 2. A kind of ultra-broadband microstrip patch antenna according to claim 1, is characterized in that, the center of circle of ellipse cut hole and ellipse patch is all positioned on the longitudinal central axis of rectangular cut corner patch, two circle centers are not in the same One point, there is a gap between the two ellipses, the major axes of the ellipse cut hole and the ellipse patch are in the horizontal direction, and are parallel to the upper and lower sides of the rectangular corner-cut patch. 3. A kind of ultra-broadband microstrip patch antenna according to claim 1, is characterized in that, two corners are excised on the left and right sides of the bottom of the rectangular cut-off patch, and the cut-off site size is the same, with the longitudinal direction of the rectangular cut-off patch The central axis is symmetrical about the center.

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