CN101976763B

CN101976763B - Ultra wide band monopole antenna with bandwidth of 2.3 to 20.1GHz

Info

Publication number: CN101976763B
Application number: CN 201010534698
Authority: CN
Inventors: 刘国美; 郭陈江
Original assignee: Northwestern Polytechnical University
Current assignee: Northwestern Polytechnical University
Priority date: 2010-11-04
Filing date: 2010-11-04
Publication date: 2013-01-16
Anticipated expiration: 2030-11-04
Also published as: CN101976763A

Abstract

The invention relates to an ultra wide band monopole antenna with the bandwidth of 2.3 to 20.1GHz, which is characterized in that a layer of radiating body medium is arranged on an FR4 medium substrate; a semi-elliptical radiating paster is arranged in the middle of the FR4 medium substrate; the radiating paster is connected with a coplanar waveguide (CPW) feeder line; the lower end of the FR4 medium substrate is provided with two symmetrical floors; the CPW feeder line passes through the gap in the middle of the two symmetrical floors; the lower half part of the radiating paster is provided with a small C-shaped slot and a big C-shaped slot along an arc; and the radius of the small C-shaped slot is smaller than the radius of the big C-shaped slot. The coverage range of the frequency is from 2.3 to 20.1GHz, the total bandwidth is 17.8GHz and is wider than the bandwidth of the general ultra wide band antenna, and a coplanar waveguide feed technique is adopted and is beneficial to the widening of the bandwidth. The invention has the advantages of simple structure, convenient manufacture and low cost. Moreover, the ultra wide band monopole antenna can finish the double limit wave function so that an ultra wide band (UWB) system is not interfered by the frequency range.

Description

A kind of bandwidth is the ultra-wideband monopole antenna of 2.3-20.1GHz

Technical field

The present invention relates to a kind of monopole antenna, a kind of bandwidth is the ultra-wideband monopole antenna of 2.3-20.1GHz, the Wideband Small-sized Planar Monopole Antenna with two notch functions.

Background technology

Continuous increase along with the wireless telecommunications demand, ultra broadband (Ultra-WideBand, UWB) wireless communication technique with the advantage such as its low-power consumption, high bandwidth, low complex degree concern extremely, FCC (FCC) in 2002 approval is with the application of 3.1-10.6GHz frequency range as super-broadband tech.Yet this frequency range also covered worldwide interoperability for microwave access (WIMAX) (3.3-3.7GHz), the working frequency range of C-band satellite communication system and WLAN (wireless local area network) (WLAN) narrowband systems (5.15-5.35GHz, 5.725-5.825GHz).In order to suppress above-mentioned communication system to the interference of UWB system, a kind of simple effective method is exactly to make ultra-wideband antenna generate simultaneously larger reflection, namely two notch functions in these frequency ranges.

Summary of the invention

The technical problem that solves

In order to overcome the above problems, the present invention has designed the ultra-wideband monopole antenna that a kind of bandwidth is 2.3-20.1GHz, satisfy the requirement of ultra broadband (3.1-10.6GHz), and the two notch functions of design are got rid of described frequency range to the interference of UWB system, and two-wire ripple frequency range is respectively 3.1-4.4GHz (centre frequency 3.6GHz) and 5.1-5.9GHz (centre frequency 5.6GHz).

Technical scheme

A kind of bandwidth is the ultra-wideband monopole antenna of 2.3-20.1GHz, it is characterized in that comprising FR4 medium substrate 1, symmetrical floor 2, radiation patch 3, little C type groove 4, large C type groove 5 and CPW feeder line 6; Be provided with one deck radiant body medium at FR4 medium substrate 1, the centre is semielliptical radiation patch 3, and radiation patch 3 links to each other with CPW feeder line 6; The lower end of FR4 medium substrate 1 is two symmetrical floors 2, and CPW feeder line 6 is by claiming the gap in the middle of the floor 2 to pass to two; The latter half in radiation patch 3 is provided with little C type groove and large C type groove along circular arc, and the radius of little C type groove is less than large C type groove; Described radiation patch 3 is semiellipse, and the first half is oval, and mid portion is rectangle, and the latter half is semicircle.

Described FR4 medium substrate 1 is of a size of wide 26mm * long 34mm * high 1.5mm; Radiant body medium height is 1.5mm; Semielliptical radiation patch 3 is of a size of: the major axis of the first half is 14mm, and minor axis is 10mm; Mid portion is rectangle, long for 14mm, wide be 7mm; The latter half is the semicircle that radius equals 7mm; CPW feeder line 6 is of a size of long 6.2mm, wide 2mm; Symmetrical floor 2 is of a size of long 11.6mm * wide 5.5mm; Slit between symmetrical floor and feeder line be 0.4mm; The distance of the latter half semicircle of radiation patch and upper end, symmetrical floor is 0.5mm; Little C type groove distance of center circle is from the central vertical downward bias of whole antenna from 3.5mm, and its width is 0.9mm, and the expanded angle that is symmetrical in central axis is 238.26 degree; C type groove distance of center circle is from the central vertical downward bias of whole antenna from 3.7mm greatly, and its width is 0.8mm, and the expanded angle that is symmetrical in central axis is 273.9 degree.

The dielectric constant of described radiant body medium is 4.4.

Described radiation patch is the copper coating.

Beneficial effect

The bandwidth that the present invention proposes is the ultra-wideband monopole antenna that 2.3-20.1GHz has two notch functions, use the FR4 material, designed a kind of miniaturized planar unipole antenna for radio ultra wide band system, adopt coplanar wave guide feedback, symmetrical floor, its radiation patch adopts semiellipse, rectangle and the oval structure that makes up, make it in frequency band standing internal wave ratio＜2 of 2.3-20.1GHz, introduce simultaneously open loop resonance structure (two nonconcentric(al) C type grooves) and realize band-rejected, make it in frequency band standing internal wave ratio＞2 of 3.1-4.4GHz and 5.1-5.9GHz, finished the notch function, avoided interference.

Frequency coverage 2.3-20.1GHz of the present invention, total bandwidth 17.8GHz, wider than general ultra-wideband antenna bandwidth, adopt the coplanar wave guide feedback technology to be conducive to Bandwidth.The present invention is simple in structure, and is easy to make, cheap, can well finish two notch functions, so that the UWB system avoids the interference of described frequency range.

Description of drawings

Fig. 1: structure chart of the present invention

The front view of Fig. 2: Fig. 1

The left side view of Fig. 3: Fig. 1

The 1-FR4 medium substrate, the symmetrical floor of 2-, 3-radiation patch, the little C type of 4-groove, the large C type of 5-groove, 6-CPW feeder line;

Fig. 4: be the emulation of front and fluting aft antenna and the contrast of actual measurement reflection coefficient of slotting;

Fig. 5: be the contrast front and fluting aft antenna standing-wave ratio of slotting.

Embodiment

Now by reference to the accompanying drawings, embodiment further describes the present invention:

Fig. 1 is structure chart of the present invention, and Fig. 2 is the vertical view of Fig. 1, and Fig. 3 is the left side view of Fig. 1.The radiant body medium of antenna is printed on the FR4 medium substrate 1, the medium substrate size: wide 26mm * long 34mm * high 1.5mm, the dielectric constant 4.4 of medium, the height 1.5mm of medium.Whole antenna size is very little, and is close with the monobasic coin-size.The material that the radiation patch 3 of antenna is used is the copper coating, and this copper coating is very thin one deck electric conductor, does not substantially have thickness.Radiation patch is semielliptical, and the major axis of the first half is 14mm, and minor axis is 10mm; Mid portion is rectangle, long for 14mm, wide be 7mm; The latter half is the semicircle that radius equals 7mm.Radiation patch links to each other with the CPW feeder line 6 of long 6.2mm * wide 2mm, makes antenna have wider bandwidth.The CPW feeder line that the symmetrical floor 2 of long 11.6mm * wide 5.5mm and CPW feeder line and medium substrate consist of carries out feed to the radiant body of antenna, with the bandwidth of operation of this broadening antenna.The size in the slit between floor side and feeder line is 0.4mm, and the distance on aerial radiation paster 3 the latter half semicircles and top, floor is 0.5mm.What the length of little C type groove 4 determined is the position of high frequency notch, and large C type groove 5 determines the position of low frequency notch.Little C type groove distance of center circle is from the central vertical downward bias of whole antenna from 3.5mm, and its width is 0.9mm, and the expanded angle that is symmetrical in central axis is 238.26 degree; C type groove distance of center circle is from the central vertical downward bias of whole antenna from 3.7mm greatly, and its width is 0.8mm, and the expanded angle that is symmetrical in central axis is 273.9 degree.As can be seen from the figure the length of the little C type of the Length Ratio groove of large C type groove is long, and the length of the groove of can reaching a conclusion is longer, and the position of notch just is offset to the low frequency place.Resonance has been introduced in the existence of large C type groove and little C type groove, does not have the basis of fluting to introduce this two C type groove at antenna and can obtain the notch function, when having than the wider bandwidth of general antenna, well avoid described frequency range to the interference of UWB system.Fig. 4 and the emulation of fluting aft antenna and the contrast of actual measurement reflection coefficient front for fluting, as seen from Figure 4 except 3.1-4.4GHz and 5.1-5.9GHz, whole 2.3-20.1GHz place return loss is all less than-10dB, this just shows and is successfully completed the notch function, and has the bandwidth of 17.8GHz.Fig. 5 is the contrast front and fluting aft antenna standing-wave ratio of slotting, also can find out and to see except 3.1-4.4GHz and 5.1-5.9GHz, the standing-wave ratio at whole 2.3-20.1GHz place is all less than 2, prove that again notch position and bandwidth are up to standard, successfully got rid of worldwide interoperability for microwave access (WIMAX) (3.3-3.7GHz), C-band satellite communication system and WLAN (wireless local area network) (WLAN) narrowband systems (5.15-5.35GHz, 5.725-5.825GHz) be to the interference of UWB system.

Claims

1. the ultra-wideband monopole antenna that bandwidth is 2.3-20.1GHz is characterized in that comprising FR4 medium substrate (1), symmetrical floor (2), radiation patch (3), little C type groove (4), large C type groove (5) and CPW feeder line (6); Be provided with one deck radiant body medium at FR4 medium substrate (1), the centre is semielliptical radiation patch (3), and radiation patch (3) links to each other with CPW feeder line (6); The lower end of FR4 medium substrate (1) is two symmetrical floors (2), and CPW feeder line (6) is passed by the gap in the middle of two symmetrical floors (2); The latter half in radiation patch (3) is provided with little C type groove and large C type groove along circular arc, and the radius of little C type groove is less than large C type groove; Described radiation patch (3) is semiellipse, and the first half is oval, and mid portion is rectangle, and the latter half is semicircle.

2. bandwidth according to claim 1 is the ultra-wideband monopole antenna of 2.3-20.1GHz, it is characterized in that: described FR4 medium substrate (1) is of a size of wide 26mm * long 34mm * high 1.5mm; Radiant body medium height is 1.5mm; Semielliptical radiation patch (3) is of a size of: the major axis of the first half is 14mm, and minor axis is 10mm; Mid portion is rectangle, long for 14mm, wide be 7mm; The latter half is the semicircle that radius equals 7mm; CPW feeder line (6) is of a size of long 6.2mm, wide 2mm; Symmetrical floor (2) is of a size of long 11.6mm * wide 5.5mm; Slit between symmetrical floor and feeder line is 0.4mm; The distance of the latter half semicircle of radiation patch and upper end, symmetrical floor is 0.5mm; Little C type groove distance of center circle is from the central vertical downward bias of whole antenna from 3.5mm, and its width is 0.9mm, and the expanded angle that is symmetrical in central axis is 238.26 degree; C type groove distance of center circle is from the central vertical downward bias of whole antenna from 3.7mm greatly, and its width is 0.8mm, and the expanded angle that is symmetrical in central axis is 273.9 degree.

3. bandwidth according to claim 1 and 2 is the ultra-wideband monopole antenna of 2.3-20.1GHz, it is characterized in that: the dielectric constant of described radiant body medium is 4.4.

4. bandwidth according to claim 1 and 2 is the ultra-wideband monopole antenna of 2.3-20.1GHz, it is characterized in that: described radiation patch is the copper coating.