CN206211033U - A kind of low section double frequency-band filtering paster antenna and its composition mimo antenna - Google Patents
A kind of low section double frequency-band filtering paster antenna and its composition mimo antenna Download PDFInfo
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- CN206211033U CN206211033U CN201621272438.6U CN201621272438U CN206211033U CN 206211033 U CN206211033 U CN 206211033U CN 201621272438 U CN201621272438 U CN 201621272438U CN 206211033 U CN206211033 U CN 206211033U
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Abstract
The utility model discloses a kind of low section double frequency-band filtering paster antenna and its mimo antenna of composition, including substrate, the earth terminal being arranged in substrate, the first U-shaped paster being arranged on the upper surface of the substrate, the second U-shaped paster and many minor matters transmission lines, the first U-shaped paster, the second U-shaped paster and many minor matters transmission lines are symmetrical on axis, the direction of the first, second U-shaped paster is identical, and the U-shaped paster of size less first is nested in the opening of the larger-size second U-shaped paster；When second working band is operated in, many minor matters transmission lines constitute feed structure；When first job frequency band is operated in, the first U-shaped paster and many minor matters transmission lines collectively form feed structure.The utility model effectively realizes circuit low section, it is possible to provide two kinds of harmonic modes being respectively regulated independently, and near pass-band produces 4 radiation zeros in target gain, so as to obtain quasi-elliptic biobelt response.
Description
Technical field
The utility model is related to field of radio frequency communication, more particularly to a kind of low section double frequency-band filtering paster antenna and its structure
Into mimo antenna.
Background technology
With the growth of the demand to various communication services, wireless user's premises equipment (Customer Premise
Equipment, abbreviation CPE) become more important in the multiphase environment of LTE network.LTE CPE are used for Wi-Fi, wired lan
Wideband data and LTE between reads and data service session.Data are transmitted by CPE to LTE network.In order to provide high speed number
According to transmission and preferably covering, generally using multiple-input and multiple-output (Multiple-input Multiple- in wireless CPE
Output, abbreviation MIMO) antenna.In addition, carrier aggregation (Carrier Aggregation, abbreviation CA) technology is also used in enhancing
In LTE, the spectrum of the fragmentation in different passbands is gathered into bigger light spectrum resource, in order to further enhance data transmissions
Power.Therefore, it can use the multiple antenna sets and bandpass filter for being operated in each frequency in the RF front ends of CPE.The opposing party
Face, because CPE is slim, it is necessary to compact as far as possible, to make installation simpler, it is therefore desirable to by antenna and bandpass filtering
Device is integrated, to lift the integrated level of RF front ends.
In recent years it has been proposed that some Integrated designs of wave filter and antenna.Designing the typical method of filter antenna is
Replacing the last single order of filter network, wherein antenna radiator with antenna radiator can realize high integration.But, some set
In meter, extra filter circuit is inserted into antenna feeding network, is caused extra insertion loss and is reduced antenna gain.For
Solve this problem, it is proposed that without the filter antenna of extra filter circuit, and do not influence with interior gain.But, above-mentioned filter
Wave antenna is only limitted to single tape operation, it is difficult to many band specifications needed for realizing CA.
Recently, it is proposed that some biobelt filter antennas.In some schemes, dual band antenna and wave filter can be separated and design right
After be cascaded, formed dual band antenna filter module.For example, rectangular patch produces two kinds of orthopoles in two passbands
Change.Again for example, realizing that biobelt is operated using TM10 the and TM30 patterns of paster.But, the working frequency of these antenna can not
Individually it is controlled.Further, since insertion loss extra caused by feeding network so that they are in two passbands
Peek gains are only -1.8/-4.0dBi and 1.1/3.8dBi.In another example, by electromagnetic coupled by U-type groove paster day
Line is integrated with the resonator of bimodulus stub loadings, can be obtained including the premium properties including harmonics restraint, but, it
Two-layer PCB construction is used, it is impossible to reach slim demand, has strengthened without specific out-of-band radiation zero point avoid selection in addition
Property.
Utility model content
In order to overcome dual band antenna to be in the prior art unable to independent control, there is blocked up or no specific out-of-band radiation zero
The defect of point, the utility model provides a kind of low section double frequency-band filtering paster antenna and its constitutes mimo antenna.
The utility model is adopted the following technical scheme that：
A kind of low section double frequency-band filters paster antenna, including substrate 1 and setting earth terminal GND on the base 1, also wraps
The first U-shaped paster 2, the second U-shaped paster 3 and many minor matters transmission lines for being arranged on the upper surface of the substrate 1 are included, described first is U-shaped
Paster 2, the second U-shaped paster 3 and many minor matters transmission lines are symmetrical on antenna axis, the first, second U-shaped paster 2,3
Opening direction it is identical, the first U-shaped paster 2 is nested in the opening of the second U-shaped paster 3；When second frequency band is operated in, institute
State many minor matters transmission lines and constitute feed structure；When first frequency band is operated in, the first U-shaped paster 2 and many minor matters
Transmission line collectively forms feed structure.
Many minor matters transmission lines include main transmission line 4 and first in the opening of the insertion first U-shaped paster 2,
Second open-circuit short-term 5,6, the main transmission line 4 is located on the antenna axis, the first, second open-circuit short-term 5,
6 be connected to the main transmission line 4 both sides with being respectively symmetrically.
The main transmission line 4, first and second open-circuit short-term 5,6 constitute " soil " character form structure, the first open-circuit short-term
Positioned at the open outer side of the first U-shaped paster 2, and in the opening of the second U-shaped paster 3, the second open-circuit short-term 6 is located at
The open outer side of the second U-shaped paster 3.
Also include the port 7 being connected with the main transmission line 4, the length of the second open-circuit short-term is split more than first
Short out line.
Described many minor matters transmission lines, the frequency of transmission zero is calculated by the abcd matrix of its two-port network；Profit
With many minor matters transmission lines as input stage, the gain curve of antenna is set to produce two radiation zeros of FREQUENCY CONTROL.
A kind of mimo antenna, including the low section double frequency-band filtering paster antenna described at least two.
At least two low sections double frequency-band filtering paster antenna shares same substrate, and at least two low section is double
Band filter paster antenna is symmetrically dispersed in the center line both sides of the substrate.
Be arranged in parallel each two low section double frequency-band filtering paster antenna it is close to each other and by a decoupling network every
From.
The decoupling network includes three finger-like short-circuit lines be arrangeding in parallel.
The length of the finger-like short-circuit line is the quarter-wave of low-frequency band.
The beneficial effects of the utility model：
It is embedded into the opening of the U-shaped paster of larger second by by the less first U-shaped paster, can effectively reduces
Thickness；The second U-shaped paster is encouraged as a part for feed structure under high-frequency work pattern by using the first U-shaped paster, can
To provide two kinds of harmonic modes being respectively regulated independently；In addition, near pass-band can produce 4 in target gain to radiate zero
Point, so as to obtain quasi-elliptic biobelt response.
Brief description of the drawings
Fig. 1 is the overlooking the structure diagram that the low section double frequency-band that the utility model embodiment is provided filters paster antenna；
Fig. 2A and 2B are respectively antenna elements shown in Fig. 1 in high frequency band and the feed structure schematic diagram of low-frequency band；
Fig. 2 C are the side structure schematic views that the low section double frequency-band that the utility model embodiment is provided filters paster antenna；
Fig. 3 A and 3B are respectively the equivalent circuit of the antenna element shown in Fig. 1 and the schematic diagram of corresponding two-port；
Fig. 4 A and 4B are respectively two-ports shown in Fig. 3 B in different parameter value Lm1And Lm3Under, | S12| simulation value-frequency
Curve map；
Fig. 5 is the schematic diagram of many minor matters transmission lines extracted from the antenna element shown in Fig. 1；
Fig. 6 A and 6B are respectively weak coupling two-ports shown in Fig. 5 in different parameter value Lm2And Lm4Under, | S12| emulation
The curve map of value-frequency；
Fig. 7 is the reflectance factor-frequency and target gain-frequency of antenna element shown in Fig. 1 when without the second U-shaped paster
The curve map of rate；
Under Fig. 8 A, 8B and 8C are respectively different design parameter values, the frequency change of radiation zero 1,0. 2,0. 3
Schematic diagram；
Fig. 9 A and 9B are respectively that the centre frequency of low-frequency band and high frequency band is only because of the regulation of respective relevant design parameter
The schematic diagram of vertical control；
Figure 10 is the reflectance factor of antenna element and has realized the simulation value and measured value of gain (to being made according to Fig. 1 and Biao 2
The material object made is measured) contrast curve；
Under Figure 11 A, Figure 11 B, Figure 11 C and Figure 11 D are respectively 1.9GHz and 2.6GHz, antenna element is in E planes and H planes
Radiation mode measured value and the contrast schematic diagram of simulation value；
Figure 12 is 2 yuan of structural representations of mimo antenna；
Figure 13 is that have decoupling network and 2 yuan of mimo antennas without decoupling network | S12| the contrast of simulation value-frequency
Curve map；
Figure 14 is 4 yuan of curve maps of the S parameter measured value-frequency of mimo antenna；
Under Figure 15 A, Figure 15 B, Figure 15 C and Figure 15 D are respectively 1.9GHz and 2.6GHz, 4 yuan of antennas of mimo antenna one are in E
The contrast schematic diagram of the measured value of the radiation mode of plane and H planes；
Under Figure 16 A and 16B are respectively low-frequency band and high frequency band, the envelope correlation coefficient calculated value-frequency of radiation mode
Schematic diagram.
Specific embodiment
With reference to embodiment and accompanying drawing, the utility model is described in further detail, but reality of the present utility model
Apply mode not limited to this.
Embodiment
It is that the structure of the low section double frequency-band filtering paster antenna that the utility model embodiment is provided is shown such as Fig. 1 and Fig. 2 C
It is intended to.As illustrated, low section double frequency-band filtering paster antenna includes substrate and the earth terminal GND being arranged in substrate, for example,
Earth terminal GND in Fig. 2 C is printed on the lower surface of substrate 1.Low section double frequency-band filtering paster antenna also includes being arranged on institute
State the first U-shaped paster 2 on the upper surface of substrate 1, the second U-shaped paster 3 and many minor matters transmission lines, the first U-shaped paster 2,
Second U-shaped paster 3 and many minor matters transmission lines are symmetrical on antenna axis, the opening of the first, second U-shaped paster 2,3
Direction is identical, and first, second U-shaped paster 2,3 is opening down in the present embodiment, and the size of the second U-shaped paster is U-shaped more than first
Paster, the U-shaped paster 2 of size less first is nested in the opening of the larger-size second U-shaped paster 3.Wherein, first is U-shaped
Paster 2 is operated in high frequency band, and the second U-shaped paster 3 is operated in lower band.
First frequency band refers to low-frequency band, and second frequency band refers to high frequency band.
As shown in Figure 2 A, when antenna cell operation is in high frequency band, many minor matters transmission lines constitute feed structure and give
Less first U-shaped paster 2 feeds.As shown in Figure 2 B, when antenna cell operation is in lower band, the first U-shaped paster 2
Non-radiating, but collectively form feed structure with many minor matters transmission lines and fed to the larger-size second U-shaped paster 3.
Preferably, as shown in figure 1, many minor matters transmission lines include the master in the opening of the insertion first U-shaped paster 2
First, second open-circuit short-term 5,6 of transmission line 4 and the open side near described first, second U-shaped paster 2,3, the master
Transmission line 4 is located on the antenna axis, and the first, second open-circuit short-term 5,6 is connected to the master with being respectively symmetrically
The both sides of transmission line 4.
Preferably, as shown in figure 1,4 and first, second open-circuit short-term of the main transmission line 5,6 constitutes " soil " font knot
Structure, the length of the first open-circuit short-term is more than the second open-circuit short-term, and the first shorter open-circuit short-term 5 is located at a U
Outside the opening of type paster 2 and in the opening of the second U-shaped paster 3, the second open-circuit short-term 6 more long is located at the 2nd U
Outside the opening of type paster 3.
Preferably, as shown in figure 1, the antenna element also includes the port 7 being connected with the main transmission line 4.
Using this compact arrangement shown in Fig. 1, antenna element can produce biobelt ellipse band logical to ring under target gain
Should, the principle of the antenna element is similar to the principle of wave filter.As shown in Figure 3A, the corresponding equivalent filter circuit of the antenna element
Radiation impedance Rr including feeding network and expression paster.Feeding network includes that by length be Lm2+Lm4Main transmission line and two
Many minor matters transmission lines that open-circuit short-term Stub1 and Stub2 are constituted, each pair open stub is symmetrically connected to the two of main transmission line
Side, input Port1 is connected with main transmission line.
In order to study the transmission characteristic of signal in two-port, as shown in Figure 3 B, the radiation resistance in Fig. 3 A is replaced with Port2
It is anti-, the coupling between feed circuit and radiation patch in Fig. 3 A is represented with electric capacity C.In Fig. 3 B each part (stub1,
Line1, stub2, line2 and electric capacity C) abcd matrix it is as follows：
The abcd matrix M of whole circuit can be obtained by the way that they are multiplied：
Obtain after Parameter Switch the S parameter of two-port：
Wherein, Z0Represent sending-end impedance, f1And f2Represent S12Molecule and denominator.Work as S12When=0, the electricity can be obtained
The transmission zero on road.
f1=2Z0·C·ω·ZC1 2·ZC2·cotθ1·cotθ3=0, and f2≠0 (8)
cotθ1·cotθ3=0 (9)
Or
Obtained from formula (8)-(10), at two respective frequencies of zero point, electronic length Lm1And Lm3It is quarter-wave
It is long.Two frequency f of transmission zero can be obtained by formula (11) and (12)z1And fz2：
Wherein, c is the light velocity under vacuum, εeffRepresent the effective dielectric constant of substrate.
Above result of calculation can be verified by simulation analysis.Fig. 4 A, 4B respectively illustrate different parameter value Lm1With
Lm3Under, two-port | S12| the curve map of simulation value-frequency, as illustrated, desired two transmission zeros can be produced.
Work as Lm1When increasing to 28.6mm from 26mm, the frequency of relatively low transmission zero is reduced to 2GHz from 2.2GHz, but, biography higher
The frequency of defeated zero point keeps constant.Similarly, by adjustment length Lm3, it is also possible to the frequency of control transmission zero higher.Under
The contrast of the transmission zero frequency that be calculated and emulation is obtained, gratifying uniformity between them are listed in table 1
Demonstrate above-mentioned analysis.
Table 1
The two-port can also produce two kinds of modes of resonance.Because feeding network (many minor matters transmission lines) can be counted as
Multi-mode resonator, in order to study the mode of resonance of the resonator, as shown in figure 5, by two ports Port1, Port2 respectively with
Resonator (many minor matters transmission lines) weak coupling.Fig. 6 A, 6B respectively illustrate different parameter value Lm2And Lm4Under, the feed in Fig. 5
Network | S12| the curve map of simulation value-frequency.By adjustment length parameter Lm2, low frequency resonant modes are changed to from 1.8GHz
2.0GHz, but high-frequency resonant mode is barely affected.Equally, by adjustment length parameter Lm4, it is also possible to control high-frequency resonant
Pattern.Therefore, by using this feeding network, two kinds of controllable transmission zeros and two kinds of controllable resonance can be obtained
Pattern.
According to above-mentioned analysis, by the feed structure provided using the utility model embodiment, can produce two it is controllable
The transmission zero of system, because under two CFs of transmission zero, signal cannot pass through feed structure and reach radiation patch,
Therefore radiation zero is produced, radiation zero is extremely important for the filtering performance of antenna.
In order to verify the generation of radiation zero, the feedback that the second U-shaped paster 3 is provided using the utility model embodiment is first studied
The situation that electric structure (as shown in Figure 2 B) is fed.Corresponding simulation result as shown in fig. 7, in 2.0GHz, 2.55GHz and
3 radiation zeros realized on target direction in gain, 0. 1,0. 2 and 0. 3 are generated at 2.97GHz.0. 1
Frequency at, electric current on feed structure is most strong near the infall of stub1 and main transmission line, because stub1 is at this
There is quarter-wave electrical length and in crosspoint short circuit at frequency, as shown in Figure 8 A, if the length change of stub1, zero
The frequency of point 1 will correspondingly change.0. 3 is same with the relation of stub2.For 0. 2, heavy current concentrates on stub1
In the two-arm of stub2, but the sense of current is conversely, the electric current on main transmission line and the edge of the first U-shaped paster 2 is also different phases
Position, therefore out of phase electric current produce radiation be cancelled, cause the radiation zero at 2.51GHz, as shown in Figure 8 C, zero
The frequency of point 2 is with L6Reduction and increase.As shown in Figure 8 B, 0. 2 frequency is also by the length L of stub27Influence, this be by
Coupling effect between the first U-shaped paster 2 and stub2.Generally, can respectively control and adjust these three radiation zeros to expire
Frequency is hoped, strengthens the alternative of filter antenna.
When increasing by the second U-shaped paster 3 in final dual band design, extra radiation zero can be produced, because two
The electric current on groove both sides between individual U-shaped paster is out of phase.Therefore, there are 4 radiation zeros in stopband, greatly enhance
The alternative and compression level of filter antenna.
When the antenna element shown in Fig. 1 and Fig. 2 C is operated in second working band, the first U-shaped paster 2 is energized, the
The non-radiating of two U-shaped paster 3 but as load.On the contrary, when antenna cell operation is in first job frequency band, first is U-shaped
The non-radiating of paster 2 but the second U-shaped paster 3 is encouraged as a part for feed structure.Because two U-shaped pasters and feed are tied
Structure can be separated and designed, therefore can respectively control two working bands.As shown in Fig. 9 A, 9B, by adjusting the first open-circuit
The length L of single short-term in short-term 57With the length p of the first U-shaped paster 22Can be with independent control frequency band higher, by regulation the
The length L of single short-term in two open-circuit short-terms 68With the length p of the second U-shaped paster 31High frequency band can had little influence on
Under conditions of the relatively low frequency band of independent control.
The low section double frequency-band filtering paster antenna that the utility model embodiment is provided, by by the less first U-shaped patch
Piece 2 is embedded into the opening of the U-shaped paster 3 of larger second, can effectively reduce thickness；By using the first U-shaped paster 2 as
A part for feed structure encourages the second U-shaped paster 3 under high-frequency work pattern, can provide two kinds of harmonic modes, by adjusting
Section two kinds of U-shaped pasters and two kinds of feed structures, can separate two kinds of working frequencies of independent control；In addition, near pass-band can be produced
4 radiation zeros in raw target gain, so as to obtain quasi-elliptic biobelt response.
In a specific embodiment, in being designed for TD-LTE, the biobelt filtering of 1.9GHz and 2.6GHz is operated in
Antenna element, as shown in Fig. 1 and Fig. 2 C, design procedure includes structure：
The first step, designs two U-shaped pasters, and mode of resonance is 1.9GHz and 2.6GHz, by the less first U-shaped paster 2
In the opening of the second larger U-shaped paster 3 of insertion, the original dimension of two U-shaped pasters is：p1=0.4~0.45 λ01, p2=
0.4~0.45 λ02(λ01And λ02The wavelength of the centre frequency of each working band in vacuum is represented respectively).
Second step, designs many minor matters transmission lines as feed structure.The length of first, second open-circuit short-term 5,6 is set
For：L8=0.25 λ1, L7=0.25 λ2(λ1And λ2Frequency f in substrate 1 is represented respectivelyz1And fz2Wavelength), to obtain near logical
The radiation zero of belt edge, and the Design of length of main transmission line 4 is：Lm2+Lm4≈0.25λ3,Lm4≈0.25λ4(λ3And λ4Respectively
Represent the wavelength of 1.9GHz and 2.6GHz in substrate 1), to obtain two modes of resonance near 1.9GHz and 2.6GHz, swash
Encourage and match radiation patch.
Finally, improve parameters with optimization design, obtain excellent filtering performance and required bandwidth.Specifically, biobelt
The parameter of filter antenna unit is as shown in table 2 below.
Table 2
The biobelt filter antenna unit produced according to above method can be tested, verify effect of the present utility model
Really.Figure 10 shows the reflectance factor of the biobelt filter antenna unit and has realized the simulation value-frequency and measured value-frequency of gain
The curve map of rate.As can be seen that two working bands are located at 1.9GHz the and 2.6GHz positions that LTE is applied.In TD-LTE B39
In the 2570-2620MHz of the 1880-1920MHz and B38 bands of band, the reflectance factor that measurement is obtained | S11| less than -10dB.Two
The gain simulation value of frequency band is respectively 7.6dBi and 7.8dBi, and gain measurements are respectively about 6.7dBi and 7.3dBi.Survey
The loss that difference between value and simulation value is mainly the manufacturing tolerance and SMA connectors that are not accounted in emulation is caused
's.- 10dBi is less than with outer gain, shows the out-of-band radiation suppression level more than 16dB, the requirement of LTE CPE can be reached.Also
As can be seen that two radiation zeros of low-frequency band are produced at frequency 1.85GHz and 2.10GHz, two radiation zero of high frequency band
Point occurs at frequency 2.50GHz and 2.91GHz, realizes two excellent filtering characteristics of working band.
Figure 11 A, 11B, Figure 11 C and Figure 11 D respectively illustrate measurement and the simulated radiation pattern of two frequency bands, between them
High consistency is reached again.In 1.9GHz and 2.6GHz, the vertical polarization region at least 32dB of the E planes that measurement is obtained and
28dB, horizontal polarized components more corresponding than each of which are strong.For H planes, the vertical polarization region that measurement is obtained is 21.2dB
And 22.3dB, horizontal polarized components more corresponding than each of which are strong.The electric wave of the front and rear contrast of reference measure, low-frequency band and high frequency
Band respectively greater than 18dB and 20dB.
By the utility model embodiment provide low section double frequency-band filtering paster antenna with comprising double narrow band filters with
The design of broad-band antenna series connection compares, and in traditional design, if narrower bandwidth, the insertion loss of PCB wave filters is up to
1.5dB, therefore the gain of the antenna and wave filter of series connection will reduction.Although cavity and dielectric play the mesh for reducing insertion loss
, but they can cause volume and weight to increase, it is impossible to reach the frivolous demand of wireless CPE.Under contrast, the utility model reality
Applying the antenna element of example offer can obtain quasi-elliptic biobelt response, without using specific filter circuit and impedance matching net
Network, therefore compact conformation, the insertion loss of feed circuit can almost be ignored.These characteristics provide the utility model embodiment
Low section double frequency-band filtering paster antenna be applied to wireless CPE.
The low section double frequency-band filtering paster antenna that the utility model embodiment is provided can be used in MIMO days of LTE CPE
In line.The mimo antenna that the utility model embodiment is provided, including the low section pair described at least two any embodiment
Band filter paster antenna.Preferably, at least two low sections double frequency-band filtering paster antenna shares same substrate, described
At least two low section double frequency-bands filtering paster antenna is symmetrically dispersed in the center line both sides of the substrate, wherein in substrate
The axis parallel of heart line and antenna element but misaligned.
By taking 2 yuan of mimo antennas as an example, as shown in figure 12, two low section double frequency-band filtering paster antennas are symmetrically disposed in
The both sides of base center line.Due to the demand to compact conformation, the two antenna elements need mutually to abut, but work as antenna element
When close to each other, intercoupling between them becomes very serious.In order to solve this problem, as shown in figure 12, in each two
Decoupling network is introduced between antenna element.Preferably, decoupling network includes three finger-like short-circuit lines be arrangeding in parallel.Due to
Second U-shaped paster of antenna element it is 3 close to each other (between edge-to-edge at intervals of d=0.15 λ0(λ0It is low frequency in vacuum
The corresponding wavelength of frequency of band)), intercoupling between the paster more U-shaped than first 2 that intercouples between them is stronger.Therefore,
The length l of finger-like short-circuit line is arranged to the quarter-wave of low-frequency band, so that between strengthening two the second U-shaped pasters 3
Isolation.Figure 13 shows decoupling network and 2 yuan of mimo antennas without decoupling network | S12| the contrast of simulation value-frequency
Curve map, as can be seen from Figure 13, using decoupling network, low-frequency band | S12| improve 5dB, less than whole frequency band in-
20dB。
Again for example, it is also possible to design 4 yuan of mimo antennas, 4 antenna element (antennas one, antenna in such as Figure 16 A and 16B
2nd, antenna three and antenna four) a common PCB substrate is shared, substrate thickness is 1.575mm (0.009 λ0), 4 antenna lists
Unit is distributed on four angles of rectangle, axis be parallel to each other between two antenna elements of (and misaligned) be provided with it is decoupling
Network, does not have decoupling network between two antenna elements that axis overlaps.The 4 yuan of S parameters of mimo antenna for measuring are as schemed
Shown in 14, passband of the return loss more than 10dB covers TD-LTE B39 bands and B38 bands, between two antenna elements for measuring
End end isolation be respectively less than -19.2dB.Figure 15 A, Figure 15 B, Figure 15 C and Figure 15 D show the radiation of the antenna one of mimo antenna
Pattern.When radiation mode is measured, antenna one is energized, and other three antenna elements play the load of 50 Ω, can be with
Obtain the pattern of the good orientation with low cross polarization and echo.Because antenna element is symmetrically arranged in substrate, other
Antenna element can also obtain almost identical result, therefore in order to succinctly without showing them.Finally, the far field electricity for measuring
Field mode is used to assess envelope correlation coefficient ECC, Figure 16 A and Figure 16 B show typical ECC results, it can be seen that TD-LTE
The ECC of B39 bands is less than 0.1 less than the ECC of 0.2, B38 bands, meets the acceptable ECC standards (＜ 0.5) of MIMO operation.
The low section double frequency-band for having used the utility model embodiment to provide filters the mimo antenna of paster antenna better than tool
There is the conventional MIMO antenna of 4 sets of stand-alone antennas and wave filter pair, because not introduced because filtering and impedance matching circuit are connected
Insertion loss.In addition, this design can realize compact size and small profile.Therefore MIMO days of the utility model embodiment
Wireless CPE of the line suitable for LTE.
High frequency band and low-frequency band herein is two frequency ranges of TDD-LTE, and the centre frequency of low-frequency band is 1.9GHz, high
The centre frequency of frequency band is 2.6GHz.
Above-described embodiment is the utility model preferably implementation method, but implementation method of the present utility model is not by described
The limitation of embodiment, it is other it is any without departing from the change made under Spirit Essence of the present utility model and principle, modify, replace
Generation, combination, simplification, should be equivalent substitute mode, be included within protection domain of the present utility model.
Claims (9)
1. a kind of low section double frequency-band filtering paster antenna, including substrate (1) and the earth terminal (GND) being arranged in substrate (1),
Characterized in that, also including being arranged on the first U-shaped paster (2), the second U-shaped paster (3) and racemosus of the substrate (1) upper surface
Section transmission line, the first U-shaped paster (2), the second U-shaped paster (3) and many minor matters transmission lines are symmetrical on antenna axis,
The opening direction of the first, second U-shaped paster (2,3) is identical, and the first U-shaped paster (2) is nested in the second U-shaped paster (3)
In opening；When second frequency band is operated in, many minor matters transmission lines constitute feed structure；When being operated in first frequency band
When, the first U-shaped paster (2) and many minor matters transmission lines collectively form feed structure.
2. low section double frequency-band according to claim 1 filters paster antenna, it is characterised in that many minor matters transmission lines
Including main transmission line (4) and first, second open-circuit short-term (5,6) in the opening for inserting the first U-shaped paster (2),
On the antenna axis, the first, second open-circuit short-term (5,6) connects the main transmission line (4) with being respectively symmetrically
It is connected on the both sides of the main transmission line (4).
3. low section double frequency-band according to claim 2 filters paster antenna, it is characterised in that the main transmission line (4),
First and second open-circuit short-term (5,6) constitutes " soil " character form structure, and the first open-circuit short-term is located at the first U-shaped paster (2)
Open outer side, and in the opening of the second U-shaped paster (3), the second open-circuit short-term (6) is positioned at the described second U-shaped patch
The open outer side of piece (3).
4. low section double frequency-band according to claim 3 filtering paster antenna, it is characterised in that also including with the main biography
The port (7) of defeated line (4) connection, the length of the second open-circuit short-term is more than the first open-circuit short-term.
5. a kind of mimo antenna, it is characterised in that double including at least two low sections as any one of claim 1-4
Band filter paster antenna.
6. mimo antenna according to claim 5, it is characterised in that at least two low sections double frequency-band filters paster
The same substrate of antenna duplexer, at least two low sections double frequency-band filtering paster antenna is symmetrically dispersed in the substrate
Heart line both sides.
7. mimo antenna according to claim 5, it is characterised in that each two low section double frequency-band filtering be arrangeding in parallel
Paster antenna is close to each other and by a decoupling Network Isolation.
8. mimo antenna according to claim 7, it is characterised in that the decoupling network includes that three be arranged in parallel
Finger-like short-circuit line.
9. mimo antenna according to claim 8, it is characterised in that the length of the finger-like short-circuit line is the four of low-frequency band
/ mono- wavelength.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106486775A (en) * | 2016-11-25 | 2017-03-08 | 华南理工大学 | A kind of low section double frequency-band filtering paster antenna and its composition mimo antenna |
| CN111653873A (en) * | 2019-03-03 | 2020-09-11 | 仁宝电脑工业股份有限公司 | Antenna structure |
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2016
- 2016-11-25 CN CN201621272438.6U patent/CN206211033U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106486775A (en) * | 2016-11-25 | 2017-03-08 | 华南理工大学 | A kind of low section double frequency-band filtering paster antenna and its composition mimo antenna |
| CN111653873A (en) * | 2019-03-03 | 2020-09-11 | 仁宝电脑工业股份有限公司 | Antenna structure |
| CN111653873B (en) * | 2019-03-03 | 2021-11-16 | 仁宝电脑工业股份有限公司 | Antenna structure |
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