CN101916913A - Ultra-wide band microstrip patch antenna - Google Patents

Abstract

The invention discloses an ultra-wide band microstrip patch antenna. The ultra-wide band microstrip patch antenna comprises an elliptical patch connected with a coaxial feed probe, and a rectangular corner-cut patch of which the central part is hollowed, wherein the elliptical patch is positioned on the hollowed part of the rectangular corner-cut patch; the hollowed part of the rectangular corner-cut patch has an elliptical structure; and the elliptical patch and the rectangular corner-cut patch are arranged on the surface of the same substrate. Through an elliptical slot-coupled structure of the antenna, the path length of surface current on the rectangular corner-cut patch is increased, and the antenna size is reduced. The elliptical slot-coupled ultra-wide band microstrip patch antenna has the advantages of small volume, low cost and easy manufacturing, and can block the charge storage of DC interference signals on the rectangular corner-cut patch through slot coupling and improve the interference resistance of the antenna.

Description

An ultra-wideband microstrip patch antenna

FIELD

[0001] The present invention relates to a microstrip antenna for use in a communication system, particularly to ultra-wideband microstrip patch antenna oval slot containing a coupling structure.

Background technique

[0002] With the radar, precision-guided, rapid development of remote sensing and wireless communications industry, the need for wide band microstrip patch antenna miniaturization is becoming increasingly urgent. In the method of expansion of a variety of microstrip antenna bandwidth, reducing the antenna size, the method of the slotted patch antenna has been widely used.

. [0003] T. Huynh and K. -F Lee two authors in 1995 in "Electronics Letters" Volume 31, No. 16 presents a U-slot microstrip patch antenna (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 in 2008. "microwave Journal" Vol. 24 No. 4 proposed copper plus a local dielectric layer, most of the U-shaped groove of air layer microstrip patch antenna, the patch antenna to improve the problems are still large dimensions, which satellite communications, mobile communications applications miniaturization of the device is not in line.

SUMMARY

[0004] The present invention addresses the deficiencies of the prior art, to provide a coaxial probe fed ultra-wideband microstrip patch antenna, the antenna structure coupled elliptic slits increase the surface currents on the low frequency patch antenna resonance point path length, in order to reduce the resonance frequency, the object of reducing the size of the antenna, the same operating frequency and bandwidth, the dielectric layer than the local copper plus previously mentioned, most of the U-shaped groove of rectangular patch antenna air layer size reduction of at least 13%.

[0005] The present invention adopts the following technical solution:

[0006] A UWB oval slot coupled microstrip patch antenna system comprising a probe in contact with the feed patch a coaxial oval, rectangular central portion is hollowed out of a corner cut patch. The rectangular patch chamfer oval patch hollowed portion, graphics portion hollowed rectangular patch chamfer is an ellipse with the rectangular patch and the patch is placed on the chamfer surface of the same substrate. Cutaway rectangular patch oval hole cut in the center of the patch of the ellipse are located on the longitudinal central axis of the rectangular patch chamfer, two are not the same center point, a gap between two oval, elliptical and oval cutouts patch the major axis are located in the horizontal direction, and upper and lower edges of the rectangular patch chamfer parallel. Rectangular patch below the chamfer around two corners are cut the same size of the excision site in a rectangular patch chamfer centered on the longitudinal axis symmetrical form.

Advantageous Effects [0007] The present invention is an elliptical slot coupled microstrip patch antenna coupling slot structure increases elliptic surface current path length in the patch antenna, reducing the size of the antenna can be miniaturized. At the same time through the slot coupling, DC blocking interfering signal charge stored on a rectangular patch chamfer, to improve the anti-interference ability of the antenna.

BRIEF DESCRIPTION

[0008] DRAWINGS The present invention is further described.

[0009] FIG. 1 is an ultra-wideband microstrip patch antenna according to the present invention, a plan view.

[0010] FIG. 2 is an ultra-wideband microstrip patch antenna according to the present invention, a front view. [0011] FIG. 3 is an ultra-wideband microstrip patch antenna according to the present invention, simulation and test pattern input return loss in the frequency band.

[0012] FIG.: 10_ ultra-wideband microstrip patch antenna, a dielectric plate 20, 11 of the central portion is hollowed rectangular patch chamfer, chamfer left 111- rectangular patch 11, a rectangular cut 112- the upper corner of the patch 11, the right 113- rectangular patch chamfer 11, a lower right corner cutting 114- rectangular patch chamfer edge 11, 115- rectangular patches lower chamfer 11 of chamfer rectangular patch 116- the lower left corner cutting edges 11, 12 oval patch, patch 121- elliptical feeding point of the coaxial probe, 30- coaxial probe, the ground plate 40, 50 coaxial feeding ground.

detailed description

A top view [0013] FIG. 1 of the present invention proposed an elliptical aperture-coupled microstrip patch antenna ultra wideband FIG. 10, FIG. 2 oval coupling slot ultra-wideband microstrip antenna 10 is a front view, ultra-wideband microstrip patch antenna 10 disposed on the dielectric plate 20, as a symmetrical structure including a rectangular central portion is hollowed out oval patch chamfer 12 and patches 11, rectangle chamfer 11 is hollowed center patch pattern portion of an ellipse with a center the center of the elliptical patch 12 are located in a rectangular patch chamfer longitudinal central axis 11, but the two are not the same center point, major axis of each rectangular patch chamfer 11 parallel upper and lower sides, there are between two oval gap. It should be noted that the patch is hollowed rectangular corner cutting portion 11 is limited to a rectangular patch 11 Cutaway itself.

[0014] The central portion is hollowed rectangular patch 11 comprises a chamfer 111 on the left, upper side 112, right side 113, a lower right corner cutting edge 114, bottom 115 and lower left corner cutting edge 116. Lower right corner cutting edge 114 and a lower left corner cutting edge 116 the same size, both sides of the longitudinal axis 11 of the rectangular patch chamfer, was symmetrical. Rectangular patch chamfer 12 between the patch 11 and the elliptic slits through intermediate coupling, impedance matching is achieved.

[0015] oval patch 12 disposed horizontally, the long axis of the rectangular patch chamfer 11 on the lower side in parallel, coaxial probe 30 by the patch 12 on the elliptical feeding point 121 in contact with the ellipse patch 12, and patch chamfer 11 rectangular slot coupling impedance matching.

[0016] Ultra wideband elliptical aperture-coupled microstrip patch antenna 10 placed in the surface of the ground plane on the surface of the dielectric plate, the dielectric plate 20 of a uniform thickness of the air 20, 20 between the dielectric plate 40, the dielectric plate 20 and ground plane uniformly between the air layer 40, around the same thickness, the dielectric plate 20 and ground plate 40 parallel.

[0017] The signals through the coaxial probe 12 30121 into the oval patch at the feed point on the patch 12 oval, elliptic and further coupled to the rectangular slot 11 to achieve impedance matching chamfer patch, coaxial feeding ground 50 and 40 are connected to the ground plane.

[0018] A preferred embodiment of the present invention, the substrate 20 is a dielectric constant of 3.2, a thickness of 1. 14mm, the loss tangent of 0.003, and the substrate 20 parallel to the ground plate 40, the substrate 20 and the ground plate 40 an air layer between the thickness IOmm; ultra-wideband coupling of the elliptical slot microstrip patch antenna 10, the overall configuration is rectangular patch chamfer longitudinal axis 11 as a reference for the symmetrical, rectangular patches chamfer 11 the left side 111, 113 of the right length, the length of the chamfer 27. 3mm rectangular patches 11 of the upper 112 is 80mm, the length of the rectangular lower chamfer 115 of the patch 11 is 40mm, as the lower right rectangular patch chamfer cut 11 corners 114, the lower left corner cutting edge 116 is a symmetrical structure, the following lower right corner cutting edge 114 as an example, the patch 11 on the right side 114 of the lower right corner cutting chamfer the intersection of the rectangle 113 to the vertical distance 115 is below 9. 7mm, the lower right corner cutting edge 115 and lower edge 114 to the intersection of the right vertical distance 113 is 20mm; rectangular patch chamfer portion 11 is hollowed out oval pattern with a center of the rectangular patch chamfer longitudinal central axis 11 of the major axis of the rectangular patch chamfer 11 on the lower side in parallel, elliptical cutouts Rectangular center vertical distance below the chamfer 115 of the patch 11 is 16mm, the length of the semimajor axis of 18mm, a length of the short axle 12. 6mm; elliptical center of the rectangular patch chamfer longitudinal center axis 11 of the patch 12 on its long axis 11 on the lower side of the rectangular patch chamfer parallel to the center of the lower side 11 of the rectangular patch chamfer vertical distance 115 is 10mm, the length of the semimajor axis of 8mm, a length of a short axle 2. 4mm; 30 coaxial probe feed point 121 on the ellipse 12 of the rectangular patch chamfer longitudinal central axis 11 of the patch, rectangular patch 11 of the vertical distance from the chamfer 115 is below 9. 04mm.

[0019] The center operating frequency of the patch antenna 2. 7GHz, input return loss less than -10dB on a frequency band 2. IlGHz~3. 30GHz, relative impedance bandwidth of the antenna up to 44%.

[0020] FIG. 3 is proposed by the present invention coupled to an elliptical slot ultra-wideband microstrip patch antenna input return loss of the test simulation and FIG. 10. Seen from FIG. 3, embodiments of the present invention super wideband microstrip patch antenna 10 having good input return loss effect, can be observed from the curve to IsiIl, input return loss in the ultra wideband frequency range of absolute value greater than 10, and the through- frequency band, the absolute value of the signal input return loss of less than 10. Whereby the elliptic aperture coupling ultra-wideband microstrip patch antenna 10 has a good impedance match within a selected frequency band.

Claims (3)

1. An ultra-wideband microstrip patch antenna, characterized by comprising a coaxial contact probe fed patches ellipse, a rectangular central portion is hollowed out chamfer patch, the patch of the rectangular oval patch chamfer is hollowed out portion, a rectangular patch is hollowed portion chamfer pattern is an ellipse with the rectangular patch and the patch is located on the chamfer surface of the same substrate.
2. 2. An ultra-wideband microstrip patch antenna according to claim 1, characterized in that the ellipse of the elliptical cutouts are located in the center of the patch longitudinal central axis of the rectangular patch chamfer, not on the same two center that there are gaps between the two oval, elliptical cutouts are major axis of the ellipse of the patch in the horizontal direction, and a rectangular patch chamfer parallel upper and lower edges.
3. 3. An ultra-wideband microstrip patch antenna according to claim 1, characterized in that the lower left corner cut rectangular patch two corners are cut the same size of the excision site in a rectangular patch longitudinal chamfer a central axis symmetrical form.