CN201515013U

CN201515013U - Ultra-wide-band antenna having filter characteristics

Info

Publication number: CN201515013U
Application number: CN2009201695854U
Authority: CN
Inventors: 罗玲; 张小苗; 齐江鹏; 崔凯; 张志国; 崔镇
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2009-10-13
Filing date: 2009-10-13
Publication date: 2010-06-23
Anticipated expiration: 2019-10-13

Abstract

The utility model provides an ultra-wide-band antenna having filter characteristics, which comprises a substrate, and an antenna main body and a grounding board, which are respectively arranged on two sides of the substrate, wherein the grounding board is also provided with a U-shaped groove which is used for filter. The grounding board is provided with the U-shaped groove for the filter, so not only the filter can be effectively realized, but also the filter range can be conveniently adjusted; in addition, the antenna has the filter function, so the size of the antenna can be greatly reduced.

Description

A kind of ultra-wideband antenna with filtering characteristic

Technical field

The utility model relates to a kind of ultra-wideband antenna with filtering characteristic.

Background technology

From (the Federal Communications Commission of FCC in 2002, be called for short FCC) opened ultra broadband (the Ultra Wide-band of civilian 3.1～10.6GHz, abbreviation UWB) since the application band, the design that is applied to the UWB antenna of this ultra-wideband communication system has become an interior focus of field of antenna.Yet because ultra broadband is a kind of and technology existing wireless communication system shared band, ultra-wideband devices reaches how to coexist with compatibility between the traditional narrow band service just becomes the research direction that has very much realistic meaning.

At present, the method that solves ultra-wideband devices and the compatibility issue of traditional narrow business normally adds some band stop filters in the antenna rear end, but this method can increase the tie point of system, makes antenna failure rate raising and dumb.Another method is that the antenna that adopts large scale to carry filter structure is realized the ultra broadband characteristic, and this method makes antenna size very big.

The utility model content

The technical problems to be solved in the utility model provides the ultra-wideband antenna with filtering characteristic that a kind of size is little, carry filter structure.

In order to address the above problem, the utility model provides a kind of ultra-wideband antenna with filtering characteristic, comprises substrate and is separately positioned on the antenna body and the ground plate on described substrate two sides, also is provided with the U type groove that is used for filtering on described ground plate.

Further, described U type groove comprises base and the arm that is symmetricly set on both sides, described base.

Further, be connected with the impedance transformer that can carry out the impedance matching conversion on the described antenna body.

Further, described impedance transformer impedance is 50 Ω-105 Ω.

Further, link to each other by two above feeder lines between described antenna body and the described impedance transformer.

Further, described feeder line quantity is 3.

The utlity model has following advantage:

1, the utility model is provided with U type groove and carries out filtering on ground plate, not only can effectively realize filtering, can also adjust filter range easily, and antenna carries filter function in addition, reduces the size of antenna greatly.

2, the utility model connects on antenna body impedance transformer is set, and realizes the impedance matching conversion, in the transmitting-receiving high frequency waves, realizes the stable of low frequency wave.

3, the utility model adopts 3 feeder lines to connect antenna body and impedance transformer, can realize comprehensive receiving and transmitting signal, reduces the blind area.

Description of drawings

Below in conjunction with accompanying drawing execution mode of the present utility model is described further:

Fig. 1 shows an a kind of ultra-wideband antenna left side with filtering characteristic of the utility model and looks schematic diagram;

Fig. 2 shows a kind of ultra-wideband antenna master with filtering characteristic of the utility model and looks schematic diagram;

Fig. 3 shows a kind of ultra-wideband antenna schematic rear view with filtering characteristic of the utility model;

Standing-wave ratio curve chart when Fig. 4 shows a kind of ultra-wideband antenna stopband with filtering characteristic of the utility model and transfers to 3.5GHz, 5.2GHz, 7.3GHz, 9.5GHz;

Level and perpendicular polarization radiation field pattern when Fig. 5 shows a kind of ultra-wideband antenna stopband with filtering characteristic of the utility model and transfers to 3.5GHz, 5.2GHz, 7.3GHz, 9.5GHz on the Z-X plane.

Embodiment

As Fig. 1, Fig. 2, shown in Figure 3, the utility model comprises substrate 1 and is separately positioned on the antenna body 2 and ground plate 3 on substrate 1 two sides, also be provided with the U type groove 8 that is used for filtering on ground plate 3.

Substrate 1 is an insulant, and the thickness of substrate 1 is 0.8mm in the present embodiment, and dielectric constant is 2.65.The ground plate 3 that substrate 1 one side is provided with is to cover the silver-plated paster of copper, with substrate 1 with wide, play the effect of ground connection.On this rectangular patch, carve a U type groove 8, be used for filtering.In the present embodiment, U type groove 8 bases 11 are 5mm apart from the substrate base, and U type groove 8 is wide to be 0.2mm, and 8 liang of arms of U type groove, 9,10 distances are 0.6mm, and adjustable part is the length of 8 liang of arms of

U type groove

9,10.

What the utility model was realized the adjusting of filtering characteristic wide range of frequencies is the length of 8 liang of arms of

U type groove

9,10, in the present embodiment, when the value of this length is respectively 14.7mm, 10mm, 7.5mm, 5.5mm, thereby emulation obtains the center frequency point of stopband and is respectively 3.5GHz, 5.2GHz, 7.3GHz, 9GHz realization ultra broadband filtering characteristic, particularly for some specific frequency range good blocking effect is arranged.

The utility model is provided with U type groove 8 and carries out filtering on ground plate 3, U type groove 8 changes field distribution on specific frequency, make equivalent current (energy) constrain near the U type groove, can't be by antenna-feedback system to external radiation.U type groove 8 not only can effectively be realized filtering, can also adjust filter range easily, and antenna carries filter function in addition, reduces the size of antenna greatly.

Be connected with impedance transformer 4 in the utility model on the antenna body 2.Antenna body 2 is a rectangular patch, and paster all adopts the silver-plated mode of copper of covering.The bottom of rectangular patch connects with the microstrip line 6 of 105 Ω, and this rectangular patch links to each other with the 50 Ω microstrip lines 7 at edge by 50 Ω-105 Ω impedance transformer 4, and at the edge feed.

The utility model connects on antenna body 2 impedance transformer 8 is set, and realizes the impedance matching conversion, in the transmitting-receiving high frequency waves, realizes the stable of low frequency wave.

In the utility model, link to each other by two above feeder lines 5 between antenna body 2 and the impedance transformer 8, this feeder line 5 adopts patch form.Feeder line 5 quantity are 3 in the present embodiment, are connected to form the type of falling E paster.The below of the type of falling E paster be one section with the microstrip line 6 of the type of falling E paster groove with 105 wide Ω, what microstrip line 6 belows of 105 Ω connected is impedance transformer 4, impedance transformer 4 be the microstrip line 6 of last base and 105 Ω with wide bottom and 50 Ω microstrip lines 7 with wide rectangular trapezoidal feeder line.The length of 50 Ω microstrip lines 7 is 2.1mm, and wide is 2mm.

The utility model adopts 3 feeder lines 5 to connect antenna body 2 and impedance transformer 4, can realize comprehensive receiving and transmitting signal, reduces the blind area.

As Fig. 4, abscissa is represented frequency (GHz), ordinate is expressed as VSWR (voltage standing wave ratio, down together), the meaning of VSWR is that this value is that voltage max in the 1 representative transmission equates with voltage minimum, thereby realizing the nothing consumption transmission of signal, and generally be not ideal state, is that VSWR ratio below 2 is seen signal as and all transferred to load so we will be worth.And VSWR is reflected at the signal that is considered as more than 2, as can be seen from the figure, each bar VSWR is a passband in whole 2-12GHZ scope, has just realized filtering in very narrow frequency range, and filtering bandwidth remains unchanged substantially, and this is very desirable filter effect.

Four curves have been represented the standing-wave ratio of U type groove 8 different length correspondences among Fig. 4, and as can be seen, U type groove 8 liang of

arms

9,10 are long more, and the stopband center frequency that obtains is low more, and this is because the girth and the wavelength of whole U type groove 8 are related.

Level when the band filtering characteristic ultra-wideband antenna that a, b are respectively shown in Figure 1 among Fig. 5 is operated in 3GHz, 5GHz, 9GHz on the Z-X plane and perpendicular polarization radiation field pattern.

The utility model has not only been realized the profile compactization, has realized filtering characteristic, and is the narrow-band filtering characteristic, the more important thing is the function that has realized regulating filtering characteristic in whole free transmission range.

In sum; it below only is preferred embodiment of the present utility model; be not to be used to limit protection range of the present utility model; therefore; all any modifications of within spirit of the present utility model and principle, being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.

Claims

1. ultra-wideband antenna with filtering characteristic is characterized in that: comprise substrate (1) and be separately positioned on the antenna body (2) and ground plate (3) on described substrate (1) two sides, also be provided with the U type groove (8) that is used for filtering on described ground plate (3).

2. the ultra-wideband antenna with filtering characteristic as claimed in claim 1 is characterized in that: described U type groove (8) comprises base (11) and is symmetricly set on the arm (9,10) on both sides, described base.

3. the ultra-wideband antenna with filtering characteristic as claimed in claim 1 is characterized in that: be connected with the impedance transformer (4) that can carry out the impedance matching conversion on the described antenna body (2).

4. the ultra-wideband antenna with filtering characteristic as claimed in claim 3 is characterized in that: described impedance transformer (4) impedance is 50 Ω-105 Ω.

5. the ultra-wideband antenna with filtering characteristic as claimed in claim 3 is characterized in that: link to each other by two above feeder lines (5) between described antenna body (2) and the described impedance transformer (4).

6. the ultra-wideband antenna with filtering characteristic as claimed in claim 5 is characterized in that: described feeder line (5) quantity is 3.