CN202196862U

CN202196862U - Ultra wide band antenna used for UMB positioning technology

Info

Publication number: CN202196862U
Application number: CN2011202021362U
Authority: CN
Inventors: 冯琛然
Original assignee: SHANGHAI SHUANGPEI CHEMICAL TECHNOLOGY Co Ltd
Current assignee: SHANGHAI SHUANGPEI CHEMICAL TECHNOLOGY Co Ltd
Priority date: 2011-06-16
Filing date: 2011-06-16
Publication date: 2012-04-18
Anticipated expiration: 2021-06-16

Abstract

The utility model provides an ultra wide band antenna used for UMB positioning technology. The ultra wide band antenna comprises a central member provided with a hollow funnel-shaped antenna, and a Balun (Balance-Unbalance) that is coupled with the antenna, wherein the two sides of the antenna are symmetrical. A part of defected ground structure is cut off on the lower part of the coupling wire of the Balun. The place where the defected ground structure is cut off is provided with a rectangular metal sheet that is not connected with the ground. The Balun comprises mutually connected a first micro-strip line, a second micro-strip line, a third micro-strip line, a fourth micro-strip line and a fifth micro-strip line. According to the defected ground structure antenna provided by the utility model, even mode impedance is increased and odd mode impedance is reduced, thereby increasing the coupling coefficient of a coupling wire and improving the performance of the Balun. From the aspect of impedance, the defected ground structure allows the even mode impedance of the coupling wire to be increased, allows the odd mode impedance of the coupling wire to be decreased, and enables the coupling coefficient to be increased, thereby improving the performance of the coupling wire.

Description

A kind of ultra-wideband antenna that is used for the UWB location technology

Technical field

The utility model relates to the communication antenna field, is specifically related to a kind ofly can dwindle the ultra-wideband antenna that Ba Lun size, performance better are used for the UWB location technology.

Background technology

UWB (Ultra Wide Band, ultra broadband) is meant the special technology that carries out wireless transmit and reception with the ultra-narrow pulse mode.U.S. FCC approval UWB can be in public correspondence frequency range 3.1GHZ-10.6GHZ operation, and its special character has been to be completely free of the traditional means that must adopt carrier modulation in the general wireless receiving and dispatching, becomes the wireless technology of direct control in time domain.

The UWB technology is applied to the national defence military communication more, wear the ground radar, imaging through walls, information communication, trailer-mounted radar, hi-Fix etc. closely; The development in an all-round way of UWB technology; Make the use of UWB antenna in communication also develop day by day; It can accomplish that size is little, bandwidth, radiation efficiency is high, security performance is high, good confidentiality, these advantages such as low in energy consumption, therefore is used widely.Simultaneously, along with the manufacturing development of microwave printed circuit, low-cost and integrated stable characteristics of feedback network obtain increasing research input to printed antenna because of it.

Development in an all-round way along with the UWB technology; A lot of UWB printed antennas occurred, it is convenient to integrate widely and uses because volume is little; We can produce the configuration of different shape; Utilize HFSS software to carry out emulation, thereby improve the bandwidth and the radiation characteristic of impedance, design rational antenna the antenna model of design.Ultra-wideband printed antenna is different with plate monopole antenna, and it does not need a vertical with it metal floor, can be integrated with other circuit easily.

The method that improves the standing-wave ratio bandwidth of printed antenna is divided into substantially, and the one, increase the bandwidth of antenna through the feeder line that adopts gradual change; The 2nd, come the width of broadening antenna through the shape that changes paster, for the bandwidth of this antenna of broadening, worked out the paster of different shape at present, heart, circle, ellipse, U-shaped, butterfly etc. are arranged.

As shown in Figure 1 is the UWB dipole antenna configuration that a kind of present use improves impedance and gain performance more widely.Intermediate seemingly funnel of this kind antenna, the both sides symmetry is a kind of dipole antenna, direction is vertical planar structure, has the frequency band of 3.1-10.6Ghz, has the gain that remains unchanged.Two arms of this kind antenna are connected through minibridge, thereby have increased the antenna current path, with this frequency band and the stability that keeps antenna gain that increases antenna, help impulse response.

But, please be clawback damage curve figure of this kind antenna simultaneously with reference to figure 2.In HFSS software, make up antenna model; This kind UWB printed antenna is produced on relative dielectric constant ε r=2.55, thickness is on the dielectric-slab of 0.8mm; Its design feature is that two arms with same radius are arranged; Simultaneously these two arms couple together through a short-circuit bridges, and these two arms are by different radiofrequency signal input stimulus, and the pyramidal structure in the antenna structure can better realize impedance matching.The parameter of the antenna from Fig. 2 sees that performance is undesirable.

The utility model content

In view of this, the purpose of the utility model provides a kind of ultra-wideband antenna of the UWB of being used for location technology, to solve the ultra-wideband antenna of prior art, the technical problem of poor-performing.

For realizing above-mentioned purpose, the utility model has adopted following technical scheme:

A kind of ultra-wideband antenna that is used for the UWB location technology; Comprise that middleware has the antenna that infundibulate hollows out, the both sides symmetry also comprises the Ba Lun with said antenna coupling; Below the coupling line of said Ba Lun, cut out partially, be provided with in the position that cuts out ground and the unconnected rectangular metal sheet in ground.

According to the described a kind of ultra-wideband antenna that is used for the UWB location technology of the utility model preferred embodiment, said Ba Lun comprises the first, second, third, fourth, the 5th microstrip line that is connected.

According to the described a kind of ultra-wideband antenna that is used for the UWB location technology of the utility model preferred embodiment, 50 ohm of the said first microstrip line impedances, long 13.27mm, wide 1.85mm.

According to the described a kind of ultra-wideband antenna that is used for the UWB location technology of the utility model preferred embodiment, 61 ohm of the said second microstrip line impedances, long 6.737mm, wide 1.33mm.

According to the described a kind of ultra-wideband antenna that is used for the UWB location technology of the utility model preferred embodiment, 87 ohm of said the 3rd microstrip line impedances, long 6.9mm, wide 0.656mm.

According to the described a kind of ultra-wideband antenna that is used for the UWB location technology of the utility model preferred embodiment, 124 ohm of said the 4th microstrip line impedances, long 7.05mm, wide 0.25mm.

According to the described a kind of ultra-wideband antenna that is used for the UWB location technology of the utility model preferred embodiment, 64.5 ohm of said the 5th microstrip line impedances, long 6.75mm, wide 1.2mm.

Owing to adopted above technical characterictic, make the utility model than prior art, have following advantage and good effect:

At first, the defect ground structure antenna that the utility model provides, odd mode impedance reduces when increasing even mode impedance, thereby has increased the coupling coefficient of coupling line, has improved the performance of Ba Lun.The even mode impedance that the angle of impedance, this defect ground structure have increased coupling line has reduced odd mode impedance simultaneously, and coupling coefficient increases, and has therefore improved the performance of coupling line.

Secondly, the even mode impedance that defect ground structure has increased Ba Lun equally reduces its odd mode impedance simultaneously.This can increase the bandwidth of operation of Ba Lun bigger even mould odd mode impedance, and improves the amplitude balance degree.Therefore, make little band transmission table reveal the slow wave characteristic, the transmission line that promptly adopts this structure has longer electrical length than normal transmission line under identical physical length, the size of therefore having dwindled Ba Lun.

Certainly, implement any one specific embodiment of the utility model content, might not reach above whole technique effect simultaneously.

Description of drawings

Fig. 1 is the sketch map of a kind of antenna of prior art;

Fig. 2 is the damage curve figure of the described existing antenna of Fig. 1;

Fig. 3 is the antenna sketch map of the utility model;

Fig. 4 is the damage curve figure of Fig. 3.

Embodiment

For ease of understanding,,, do being described in further detail to the preferred embodiment of the utility model below in conjunction with accompanying drawing.

As shown in Figure 3, the UWB antenna can improve performance through designing various forms of Ba Lun, and this patent has been selected defect ground structure for use, and odd mode impedance reduces when increasing even mode impedance, thereby has increased the coupling coefficient of coupling line, has improved the performance of Ba Lun.

In this novel defect ground structure, the coupling line below cuts out partially, adds in the place that cuts out defective in addition and the disjunct rectangular metal sheet in ground.

The even mode impedance that defect ground structure has increased Ba Lun equally reduces its odd mode impedance simultaneously.Bigger even mould odd mode impedance is than the bandwidth of operation that can increase Ba Lun, and improves the amplitude balance degree.Therefore, the Ba Lun based on defect ground structure has wideer frequency band and better equilibrium response.

Fig. 4 is the return loss plot that adopts the antenna of defect ground structure; Can know through Fig. 4; Change the ground structure of coupling line, behind the employing defect ground structure, its return loss plot has had tangible improvement in low frequency part; Satisfied in the 3.1GHZ-10.6GHZ frequency band of UWB all under-10dB, expanded the width of low frequency simultaneously.

Said Ba Lun comprises the first, second, third, fourth, the

5th microstrip line

1,2,3,4,5 that is connected, 50 ohm of said first microstrip line 1 impedances, long 13.27mm; Wide 1.85mm, 61 ohm of second microstrip line, 2 impedances, long 6.737mm; Wide 1.33mm; 87 ohm of said the 3rd microstrip line 3 impedances, long 6.9mm, wide 0.656mm.124 ohm of the 4th microstrip line 4 impedances, long 7.05mm, wide 0.25mm.64.5 ohm of the 5th microstrip line 5 impedances, long 6.75mm, wide 1.2mm.

In sum, in the design of the utility model, utilization HFSS comes phantom antenna; Find through continuous emulation; Design the antenna that satisfies performance, change the structure of Ba Lun, finally find the better antenna of a performance; The antenna that is designed has the effect of widening frequency band in low frequency part, and portable characteristic also is fit to be applied to the UWB location instrument of chemical plant installations personnel and equipment very much.

More than disclosed only be the preferred embodiment of the utility model; But be not to be used for limiting itself, anyly have the knack of those skilled in the art, under the situation of the utility model spiritual connotation; The equalization of being done changes and changes, and all should drop in the protection range of the utility model.

Claims

1. ultra-wideband antenna that is used for the UWB location technology; It is characterized in that; Comprise that middleware has the antenna that infundibulate hollows out, the both sides symmetry also comprises the Ba Lun with said antenna coupling; Below the coupling line of said Ba Lun, cut out partially, be provided with in the position that cuts out ground and the unconnected rectangular metal sheet in ground.

2. a kind of ultra-wideband antenna that is used for the UWB location technology as claimed in claim 1 is characterized in that, said Ba Lun comprises the first, second, third, fourth, the 5th microstrip line that is connected.

3. the ultra-wideband antenna of a kind of UWB of being used for location technology as claimed in claim 1, it is characterized in that 50 ohm of the said first microstrip line impedances, long 13.27mm, wide 1.85mm.

4. the ultra-wideband antenna of a kind of UWB of being used for location technology as claimed in claim 1, it is characterized in that 61 ohm of the said second microstrip line impedances, long 6.737mm, wide 1.33mm.

5. the ultra-wideband antenna of a kind of UWB of being used for location technology as claimed in claim 1, it is characterized in that 87 ohm of said microstrip line impedances, long 6.9mm, wide 0.656mm.

6. the ultra-wideband antenna of a kind of UWB of being used for location technology as claimed in claim 1, it is characterized in that 124 ohm of said the 4th microstrip line impedances, long 7.05mm, wide 0.25mm.

7. the ultra-wideband antenna of a kind of UWB of being used for location technology as claimed in claim 1, it is characterized in that 64.5 ohm of said the 5th microstrip line impedances, long 6.75mm, wide 1.2mm.