CN201285799Y - PIFA microstrip double frequency antenna for WLAN - Google Patents

Abstract

The utility model discloses a PIFA microstrip double frequency antenna used for WLAN. The antenna comprises a floor, a dielectric substrate, a first metal shielding strip, a second metal shielding strip and a metal conduction band, wherein the dielectric substrate is vertical to the floor and is arranged in the center of the narrow side of the floor; the first metal shielding strip, the second metal shielding strip and the metal conduction band are printed on the dielectric substrate; the metal conduction band is in an F shape with a downward opening in the horizontal direction, and the tail part of the metal conduction band is horizontally provided with a U-shaped groove with a leftward opening; the contact point of the first metal shielding strip and the floor is a first short circuit point, the contact point of the metal conduction band and the floor is a second short circuit point, and the contact point of the second metal shielding strip and the floor is a third short circuit point; and a feeding point is arranged in the middle of the margin of the feeding end of the metal conduction band. The utility model utilizes the U-shaped groove with regular shape and few notches and changes the current distribution on the strip so that the whole antenna has small volume, double frequency bands, easy integration, convenient production and use and favorable market prospect.

Description

The PIFA microstrip double frequency antenna that is used for WLAN

Technical field

The utility model relates to a kind of antenna, particularly a kind of PIFA microstrip double frequency antenna that is used for WLAN.

Background technology

Continuous development along with mobile communication technology, use universally day by day, to mobile communication equipment, especially terminal has had higher requirement, and, then require it that low return loss, small size are arranged and be easy to characteristics such as integrated as an important component part---the antenna of terminal.In real world applications, often volume is bigger to be suitable for the individual radio communication product of a plurality of different operating frequencies, be not easy to use and carry, and the production cost height, complex process makes that ordinary consumer is difficult to accept.

Summary of the invention

The purpose of this utility model is to provide a kind of volume little, double frequency-band, the PIFA microstrip double frequency antenna that is used for WLAN producing and use be convenient to easy of integration.

The technical solution that realizes the utility model purpose is: this antenna comprises the floor, dielectric substrate, the first metallic shield bar, the second metallic shield bar, the metal conduction band, wherein dielectric substrate is perpendicular to the floor, and be positioned at narrow limit, floor central authorities, the first metallic shield bar, the second metallic shield bar, the metal conduction band is printed on the dielectric substrate, the metal conduction band is " F " shape that Open Side Down in the horizontal direction, afterbody at this metal conduction band, level be provided with an opening " U " shape groove left, contact point first short dot on the first metallic shield bar and floor, the contact point on metal conduction band and floor is second short dot, the contact point on the second metallic shield bar and floor is the 3rd short dot, and distributing point is positioned at the centre position at the feed end edge of metal conduction band.

The present invention compared with prior art, its remarkable advantage: the utility model utilization " U " shape fluting, changed CURRENT DISTRIBUTION on the sheet, thereby reached dual-band requirement.Compared to other mode of grooving, " U " shape fluting has advantages such as regular shape, fluting quantity are few, and institute's materials used is less, greatly reduces the difficulty of processing.In addition, the conduction band of microstrip antenna, vertical this kind microstrip antenna structure compactness more that makes with ground plate of dielectric substrate become possibility thereby make it be used for portable set.

Description of drawings

Fig. 1 is the stereogram that is used for the PIFA microstrip double frequency antenna of WLAN according to the utility model.

Fig. 2 is the front view that is used for the PIFA microstrip double frequency antenna of WLAN according to the utility model.

Fig. 3 is the vertical view that is used for the PIFA microstrip double frequency antenna of WLAN according to the utility model.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail.

As Fig. 1, the disclosed a kind of PIFA microstrip double frequency antenna that is used for WLAN of Fig. 2 and Fig. 3, this antenna comprises floor 1, dielectric substrate 2, the first metallic shield bar 3, the second metallic shield bar 4, metal conduction band 5, wherein dielectric substrate 2 is perpendicular to floor 1, and be positioned at narrow limit, floor central authorities, the first metallic shield bar 3, the second metallic shield bar 4, metal conduction band 5 is printed on the dielectric substrate 2, metal conduction band 5 is " F " shape that Open Side Down in the horizontal direction, afterbody at this metal conduction band 5, level be provided with an opening " U " shape groove 6 left, the contact point first short dot A on the first metallic shield bar 3 and floor 1, metal conduction band [5] is the second short dot B with the contact point on floor [1], the second metallic shield bar 4 is the 3rd short dot D with the contact point on floor 1, and distributing point C is positioned at the centre position at the feed end edge of metal conduction band 5.1 long limit, floor is 80mm～120mm, and minor face is 50mm～70mm; Dielectric substrate 2 length are 22mm-26mm, and width is 4.5mm～5.5mm, and thickness is 0.7mm～0.9mm, and the distance of growing the limit apart from floor 1 is 18mm; The length of the first metallic shield bar 3, the second metallic shield bar 4 is 0.8mm～1.2mm, and width is 4.5mm～5.5mm; Metal conduction band 5 is by rectangular patch 51, rectangle short-circuiting bar 52, rectangle power strip 53 constitutes, rectangle short-circuiting bar 52 is connected in the second short dot B with floor 1, rectangle power strip 53 lower ends are distributing point C, rectangular patch 51 is positioned at the top of dielectric substrate 2, rectangle short-circuiting bar 52 is connected rectangular patch 51 and is positioned at its lower end with rectangle power strip 53, the right hand edge distance of the left hand edge distance first metallic shield bar 3 of rectangular patch 51 and rectangle short-circuiting bar 52 is 0.5mm～1.5mm, distance between two adjacent edges of rectangle power strip 53 and rectangle short-circuiting bar 52 is 1mm～2mm, wherein the length of rectangular patch [51] is 18mm～20mm, and wide is 2mm～3mm; The length of rectangle short-circuiting bar [52] is 0.5mm～1.5mm, and wide is 1.5mm～3.5mm; The length of rectangle power strip 53 is 1mm～2.5mm, and wide is 1mm～3mm; The U type groove 6 openings right-hand member that is horizontally placed on rectangular patch 51 left, the distance of outer bottom land distance 51 right hand edges is 1mm～5mm, groove depth is 5mm～9mm, distance in adjacent between trough rim and the outer trough edge is 0.4mm～0.7mm, distance between interior bottom land and the outer bottom land is 0.4mm～0.8mm, distance between the two cell walls outside is 1mm～2mm, and groove is positioned at 51 centre position, two long limits, and filling relative dielectric constant ε r is 3～5 material in the dielectric substrate 2.By very ripe at present microwave integrated circuit technology, make this antenna, rectangular metal ground plate 1 long limit is 100mm, minor face is 60mm. dielectric substrate 2 long 24mm, wide 5mm, thickness is 0.8mm, and 90 degree are perpendicular to floor 1, be positioned over the minor face on floor 1, being positioned at the two long limit central authorities on floor 1. metal tape is perpendicular to floor 1 and be printed in the outside of dielectric substrate 2, and wherein the first metallic shield bar 3 and the second metallic shield bar 4 are positioned in substrate 2 two ends, and be measure-alike, long is 1mm, and wide is 5mm; Metal conduction band 5 is between the first metallic shield bar 3 and the second metallic shield bar 4, and present in the horizontal direction that Open Side Down " F " shape, metal conduction band 5 is made up of three parts: rectangular patch 51, rectangle short-circuiting bar 52, rectangle power strip 53. rectangle short-circuiting bars 52 are connected in the second short dot B point with ground plate, rectangle power strip 53 lower ends are distributing point C, rectangular patch 51 is positioned at the top of dielectric substrate 2, rectangle short-circuiting bar 52 is connected rectangular patch 51 and is positioned at its lower end with rectangle power strip 53, the right hand edge distance of the left hand edge distance first metallic shield bar 3 of rectangular patch 51 and rectangle short-circuiting bar 52 is 1mm, rectangle power strip 53 is 1.5mm with the right hand edge distance of rectangle short-circuiting bar 52, rectangular patch 51 long 20mm wherein, wide 2mm; Rectangle short-circuiting bar 52 long 1mm, wide 3mm; Rectangle power strip 53 long 1.5mm, wide 2mm.U type groove 6 is for being horizontally placed on metal conduction band 5 upper sheds U type cutting left, the outer bottom land of U type groove 6 is apart from the right hand edge 3.2mm of rectangular patch 51, U type groove 6 is positioned at two length limit central authorities of rectangular patch 51, groove depth 7mm, distance between adjacent two internal groove side walls and the external groove sidevall is 0.6mm, distance between the two cell walls outside is 1.6mm, water jacket apart from the distance of rectangular patch 51 right hand edges for 3.2mm. the utility model adopts coaxial back feed type feed, feedback point C is positioned at the center of rectangle power strip 53 ends, the first short dot A, the second short dot B and the 3rd short dot D are respectively the first metallic shield band 3, metal conduction band 5, the short circuit contact point of the second metallic shield bar 4 and floor 1 short circuit.

Claims (2)

1, a kind of PIFA microstrip double frequency antenna that is used for WLAN, it is characterized in that this antenna comprises floor [1], dielectric substrate [2], the first metallic shield bar [3], the second metallic shield bar [4], metal conduction band [5], wherein dielectric substrate [2] is perpendicular to floor [1], and be positioned at narrow limit, floor central authorities, the first metallic shield bar [3], the second metallic shield bar [4], metal conduction band [5] is printed on the dielectric substrate [2], metal conduction band [5] is " F " shape that Open Side Down in the horizontal direction, afterbody at this metal conduction band [5], level be provided with an opening " U " shape groove [6] left, contact point first short dot [A] on the first metallic shield bar [3] and floor [1], metal conduction band [5] is second short dot [B] with the contact point on floor [1], the second metallic shield bar [4] is the 3rd short dot [D] with the contact point on floor [1], and distributing point [C] is positioned at the centre position at the feed end edge of metal conduction band [5].

2, according to the PIFA microstrip double frequency antenna that is used for WLAN described in the claim 1, it is characterized in that long limit, described floor [1] is 80mm～120mm, minor face is 50mm～70mm; Dielectric substrate [2] length is 22mm-26mm, and width is 4.5mm～5.5mm, and thickness is 0.7mm～0.9mm, and the distance of growing limit apart from floor [1] is 18mm; The length of the first metallic shield bar [3], the second metallic shield bar [4] is 0.8mm～1.2mm, and width is 4.5mm～5.5mm; Metal conduction band [5] is by rectangular patch [51], rectangle short-circuiting bar [52], rectangle power strip [53] constitutes, rectangle short-circuiting bar [52] is connected in second short dot [B] with floor [1], rectangle power strip [53] lower end is distributing point [C], rectangular patch [51] is positioned at the top of dielectric substrate [2], rectangle short-circuiting bar [52] is connected rectangular patch [51] and is positioned at its lower end with rectangle power strip [53], the right hand edge distance of the left hand edge distance first metallic shield bar [3] of rectangular patch [51] and rectangle short-circuiting bar [52] is 0.5mm～1.5mm, distance between two adjacent edges of rectangle power strip [53] and rectangle short-circuiting bar [52] is 1mm～2mm, wherein the length of rectangular patch [51] is 18mm～20mm, and wide is 2mm～3mm; The length of rectangle short-circuiting bar [52] is 0.5mm～1.5mm, and wide is 1.5mm～3.5mm; The length of rectangle power strip [53] is 1mm～2.5mm, and wide is 1mm～3mm; U type groove [6] the opening right-hand member that is horizontally placed on rectangular patch [51] left, the distance of outer bottom land distance [51] right hand edge is 1mm～5mm, groove depth is 5mm～9mm, distance in adjacent between trough rim and the outer trough edge is 0.4mm～0.7mm, distance between interior bottom land and the outer bottom land is 0.4mm～0.8mm, distance between the two cell walls outside is 1mm～2mm, and groove is positioned at the centre position, two long limits of [51], and filling relative dielectric constant ε r is 3～5 material in the dielectric substrate [2].

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