CN2533634Y

CN2533634Y - Broadband microstrip patch antenna

Info

Publication number: CN2533634Y
Application number: CN01247007U
Authority: CN
Inventors: 段文虎; 向雷轰; 胡蕊那; 刘军州; 王小龙; 俱新德
Original assignee: XI'AN HAITIAN ANTENNA SCI-TECH Co Ltd
Current assignee: XI'AN HAITIAN ANTENNA SCI-TECH Co Ltd
Priority date: 2001-09-05
Filing date: 2001-09-05
Publication date: 2003-01-29
Anticipated expiration: 2011-09-05

Abstract

The utility model relates to a broadband micro strip patch antenna and aims at solving the defects of narrow bandwidth, complex structure and bigger size of present micro strip antennas, wherein, an m-shaped metal sheet with the air as the medium is adopted as a micro strip patch and a feeder hole (8) is arranged at the center of the patch; a coaxial probe (2) goes out of the feeder hole to be fixed with the patch to form a direct feeding structure of the patch; two same m-shaped micro strip patches are respectively arranged on a front face and a back face of a ground plate(3) to form a bidirectional micro strip patch antenna; coaxial lines (9) and (10) of the two micro strip patches are in parallel connection to form a coaxial line (15) at an output terminal of the bidirectional micro strip antenna and two coaxial lines with the length of l/4 and the characteristic impedances of 50 ohms and 70ohms are in parallel connection to serve as an impedance matching segment (16) to realize the impedance matching of the bidirectional micro strip patch antenna. The utility model has the advantages of narrow bandwidth, low profile, light weight and low cost and can be used as a wall hanging antenna in indoor distributing systems and a bidirectional antenna in channels.

Description

The wideband microstrip paster antenna

Technical field

The utility model relates to a kind of antenna, particularly a kind of being used in the indoor distributed system as wall aerial and the broadband low profile micro-strip paster antenna that uses as bilateral antenna at the passage place.

The prior art situation

Along with developing rapidly of mobile communication, the people have proposed more and more higher requirement to the quality of communication.For the mobile communication quality of occasions such as improving and effectively solve in market place builet below the ground, subway, tunnel, the groups of building, indoor distributed system is paid attention to and development rapidly widely as the important supplement means and the branch of mobile communication.But, have higher requirement therefore just for the practical layout design of indoor distributed system because the many formulas of layout of interior architecture are various.According to different indoor arrangement both needs use omnidirectional's ceiling aerial, also needs use wall aerial, in the passageway, walk exterior feature, bilateral antenna is located also to need to use in tunnels etc.For all mobile subscribers' of satisfying GSM and CDMA mobile phone needs, domestic aerial not only should have broadband character, and harmonious with interior decoration.Thereby domestic aerial also should have, and volume is little, the characteristics of good looking appearance.As everyone knows, microstrip antenna is one and has low profile, in light weight, directed medium-gain antennas cheaply, but that its disadvantage is a frequency band is too narrow.Though adopt short-circuit patch or additional one or more layers parasitic patch technology in the prior art, the bandwidth of coming the broadening micro-strip paster antenna makes the structure of antenna become complicated, and also the phase strain is big for volume.To bilateral antenna, the employing that prior art has is Yagi antenna back-to-back, and what have connects two cell corner reflectors back-to-back and constitute, though the bilateral antenna of these two kinds of versions is simple in structure, but still has the narrow and relatively large deficiency of size of frequency band.

The content of utility model

The utility model mainly solves existing microstrip antenna and the bilateral antenna frequency band is narrow, complex structure, larger-size deficiency, and a kind of novel micro-strip paster antenna is provided, and it had both had broadband character, had low profile, the relative characteristic of simple of structure again.This paster antenna is all installed on both sides at ground plate, just can be easy to constitute the relatively little broadband bilateral antenna of size.Wideband microstrip paster antenna provided by the utility model is an individual layer paster antenna of directly using the coaxial probe feed, is with the difference of the paster antenna of common coaxial probe direct feed, and it is ε that this paster material therefor is filled relative dielectric constant in the middle of not being _rSubstrate, be the sheet metal of medium but adopt with the air, the shape of this single layer microstrip patch neither shapes such as rectangle, garden shape, ellipse garden type, triangle or ladder types, but has the shape that distortion English alphabet m is arranged slightly, as shown in Figure 1.Whole device is made up of the foam block 5 of microband paste 1, coaxial probe pillar 2, ground plate 3, coaxial socket 4 and support microband paste 1.The outer conductor 6 of coaxial socket 4 links to each other with ground plate, and the inner wire 7 and the coaxial probe 2 of coaxial socket 4 join, and are drilled with aperture 8, the distributing point of this Kong Zewei paster in m shaped microstrip paster 1 center.Coaxial probe 2 passes with paster from centre bore 8 and fixes, to give the paster feed.Adjust the height and the rugosity of probe 2, just can make m type paster antenna have broadband character, actual measurement is tested the result and is shown that in 824-960MHZ and 1710-1990MHZ frequency range, bandwidth is 15%, voltage standing wave ratio VSWR≤1.5, and the gain of antenna is 8-9dB.

Description of drawings

Fig. 1 is the structural representation of the utility model monolithic m type micro-strip paster antenna

Fig. 2 is the structural representation of the two-way m type of the utility model micro-strip paster antenna

Fig. 3 is the VSWR frequency characteristic curve diagram of unidirectional m type microband paste

Fig. 4 is the H face actual measurement directional diagram of unidirectional m type microband paste

Fig. 5 is the E face actual measurement directional diagram of unidirectional m type microband paste

Fig. 6 is the VSWR frequency characteristic curve diagram of two-way m type micro-strip paster antenna

Fig. 7 is two-way m type micro-strip paster antenna H face actual measurement directional diagram

Fig. 8 is two-way m type micro-strip paster antenna E face actual measurement directional diagram

Embodiment

In unidirectional M type microband paste structure shown in Figure 1,1 is microband paste, and 2 is the coaxial probe pillar, and its one links to each other with the inner wire 7 of coaxial socket 4, and the other end has screw, and the aperture 8 from the microband paste 1 passes with paster 1 and fixes.The outer conductor 6 of coaxial socket 4 links to each other with ground plate 3, thereby has realized directly giving with coaxial probe the purpose of microband paste feed.Be plugged with foam block (ε between microband paste 1 and the ground plate 3 _r=1), to support microband paste 1.The m type that is shaped as of microband paste 1, member and main geometric is long L=0.38 λ ₀, (λ ₀Be the central task wavelength) beam overall B=0.44 λ ₀, middle inner width B ₂=0.15 λ ₀, both sides inner width B ₁=0.126 λ ₀Distributing point 8 is positioned at the geometric center of m type microband paste, and m type micro-strip paster antenna is apart from height H=0.12 λ of ground plate ₀

Two-way M type micro-strip paster antenna shown in Figure 2 is at the back side of the unidirectional m type of Fig. 1 micro-strip paster antenna ground plate 3, promptly-and one of z direction installation and the identical m type of Fig. 1 microband paste.Different is that Fig. 1 coaxial socket 4 is changed into semihard

coaxial line

9 and 10, and the outer conductor 11 of coaxial line 9 all links to each other with ground plate 3 with the outer conductor 12 of coaxial line 10, and the inner wire 13 of coaxial line 9 all links to each other with coaxial probe 2 with the inner wire 14 of coaxial line 10.For the ease of linking to each other, two

coaxial lines

9 and 10 to be merged into a coaxial line 15 at the output of antenna with transceiver.Coaxial

line

9 and 10 and to connect be any coaxial line with wherein, for example coaxial line 9, by a reverse side that pierces to ground plate on ground plate 3, again with coaxial line 10 in parallel the getting final product that are positioned at the ground plate reverse side.In order to realize impedance matching,

coaxial line

9 and 10 and the contact one section impedance matching section 16 of having contacted.This impedance matching section 16 is long by two λ/4, and characteristic impedance is respectively the coaxial line 17 of 50 Ω and coaxial line 18 that characteristic impedance is 75 Ω is formed.Two

coaxial lines

17 and 18 inner wire one end are connected in parallel, and the other end is connected with 14 with 10 inner wire 13 with coaxial line 9 respectively, and 19 is coaxial socket.

The utility model 824-960MHZ and 1710-1990MHZ frequency range processing and fabricating unidirectional broadband m type micro-strip paster antenna shown in Figure 1, as indoor wall aerial.Fig. 3 is the actual measurement voltage standing wave ratio curve of Fig. 1 embodiment in the 1710-1990MHZ frequency range, as can be seen from Figure, in the 1710-2100MHZ frequency range (bandwidth=20%), voltage standing wave(VSW) VSWR≤1.5.Fig. 4 and Fig. 5 are respectively actual measurement H face and the E face directional diagrams of Fig. 1 embodiment 1800MHZ, and its half-power beam width is respectively HPBW _H=67 ° and HPBW _H=56 °, to compare with standard-gain horn, the actual measurement gain is 8-9dBi.The utility model is by the wide-band bidirectional m type micro-strip paster antenna of structure fabrication shown in Figure 2, and it surveys voltage standing wave ratio curve such as Fig. 6, in the 1648-2000MHZ band limits (bandwidth=19%) as seen from Figure 6, VSWR≤1.5.Fig. 7 and Fig. 8 are respectively the measured level face (H face) and vertical plane (E face) directional diagram of two-way broadband m type micro-strip paster antenna, and its half-power beam width is respectively HPBW _H=85 °, HPBW _E=80 °, can find out from figure, no matter at horizontal plane still at vertical plane, two lobe maximums are all arranged, the amphicheirality of Here it is antenna.

Claims

1. wideband microstrip paster antenna, comprise microband paste, coaxial probe, ground plate, coaxial socket, the outer conductor (6) of coaxial socket (4) is connected with ground plate (3), and the inner wire (7) of coaxial socket (4) is connected with coaxial probe (2), it is characterized in that:

A. microband paste (1) employing is the m shape sheet metal of medium with the air, and m shape sheet metal center is drilled with power feed hole (8), and coaxial probe (2) passes with paster from this hole and fixes, and constitutes paster direct feed structure;

B. two identical microband pastes are connected to the positive and negative of same ground plate (3), promptly constitute two-way micro-strip paster antenna.

2. micro-strip paster antenna according to claim 1, it is characterized in that coaxial socket (4) used instead semihard coaxial line (9) and (10) in constituting two-way microband paste, the inner wire (13) of this coaxial line (9) and (10) is connected with the coaxial probe (2) of two microband pastes that are arranged in the ground plate positive and negative respectively with (14), and the outer conductor (11) of coaxial line (9) and (10) all is connected with ground plate (3) with (12).

3. micro-strip paster antenna according to claim 1, it is characterized in that the output of antenna with two coaxial lines (9) in parallel with (10) be a coaxial line (15), and be connected in series one section impedance matching section (16).

4. according to claim 1 or 3 described micro-strip paster antennas, it is characterized in that impedance matching section (16) is long by two λ/4, characteristic impedance is respectively the coaxial line (17) of 50 Ω and coaxial line (18) that characteristic impedance is 75 Ω is formed, two coaxial lines (17) are connected in parallel with an end of (18), and the other end is connected with (14) with the inner wire (13) of coaxial line (9) and (10) respectively.