CN207282711U - A kind of millimeter wave circular polarised array antenna and its radiator - Google Patents
A kind of millimeter wave circular polarised array antenna and its radiator Download PDFInfo
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- CN207282711U CN207282711U CN201721230683.5U CN201721230683U CN207282711U CN 207282711 U CN207282711 U CN 207282711U CN 201721230683 U CN201721230683 U CN 201721230683U CN 207282711 U CN207282711 U CN 207282711U
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Abstract
The utility model discloses a kind of millimeter wave circular polarised array antenna and its radiator, the antenna includes first medium substrate, second medium substrate, first floor, feeding network and radiator, the radiator, first medium substrate, first floor, second medium substrate and feeding network are set gradually from top to bottom, the radiator includes radiant panel and the multiple radiating elements being arranged on radiant panel, each radiating element includes four short-circuit patch, two of which short-circuit patch diagonally sets and is loaded with L-shaped minor matters, two other short-circuit patch diagonally sets and has corner cut portion；Each radiating element is connected by the through hole through first medium substrate with the first floor.The millimeter wave circular polarised array antenna of the utility model has longer bandwidth, larger gain, wider Circular polarization ratio, and it is simple in structure, it disclosure satisfy that requirement of Ministry of Industry and Information's planning for millimeter wave frequency band mobile service middle width strip wireless access system (42.3 48.4GHz).
Description
Technical field
A kind of array antenna is the utility model is related to, especially a kind of millimeter wave circular polarised array antenna and its radiator,
Belong to field of wireless communication.
Background technology
With flourishing for wireless communication technique, low-frequency electromagnetic wave frequency spectrum resource increasingly tends to be exhausted.In order to meet 5G
The challenge of (the 5th Generation) high-speed communication, certainly will develop the frequency spectrum resource of millimeter wave frequency band.Compared to linear polarization
Antenna circular polarized antenna has many obvious advantages, such as anti-multipath reflects, avoids polarization mismatch and reception and transmitting antenna
Flexibility alignment etc..The communication of millimeter wave frequency band receives the influence of the factors such as high Propagation in free space, Atmospheric Absorption, because
This millimeter wave antenna system usually requires that high-gain carrys out the decay of compensation electromagnetic wave energy.By the way that millimeter wave antenna is formed battle array
Row, it is possible to achieve the high-gain output of antenna system.Just from the point of view of existing report domestic at present, 42.3-48.4GHz frequencies are worked in
16 element array antenna of millimeter wave in segment limit only has a small number of several moneys, and wherein polarization mode takes the just less of circular polarisation.
Or axial ratio bandwidth is relatively narrow mostly for existing millimeter wave circular polarized antenna, or the excessively complicated unsuitable large scale array of structure
Using.Therefore, the very wide millimeter wave circular polarisation battle array of a simple in structure, high gain, impedance bandwidth and axial ratio bandwidth is designed
Array antenna is very necessary.
It is as follows with understanding, disclosed prior art according to investigations：
2016, Yujian Li, Kwai-Man Luk et al. was in " IEEE TRANSACTIONS ON ANTENNAS AND
PROPAGATION " delivers entitled " A 60-GHz Wideband Circularly Polarized Aperture-Coupled
In the article of Magneto-Electric Dipole Antenna Array ", by the way of SIW cutler feeds, to one kind circle
Polarity electromagnetic dipole antenna array is fed.Whole antenna uses three layers of medium substrate, passes through gap between each dielectric-slab
Coupled, realize very wide axial ratio bandwidth and impedance bandwidth, the gain in working frequency range has exceeded 24dBi.But
As a result of SIW feed structures, the structure of whole feeding network is very complicated and volume is also very huge, in order to realize battle array
The design of row, whole antenna must be built in three layers of medium substrate.
2016, Q.Zhu, K.B.Ng, C.H.Chan, et al. in " IEEE TRANSACTIONS ON ANTENNAS AND
PROPAGATION " delivers entitled " Printed Circularly Polarized Spiral Antenna Array for
In the article of Millimeter-Wave Application ", antenna uses SIW cutler feeds, is constituted using three layers of dielectric-slab
One 4*4 member circular polarised array antenna, antenna radiator are made of planar double-helix, have very wide axial ratio bandwidth and impedance band
It is wide.But become very complicated as a result of three layers of dielectric-slab, the structure of antenna.
Utility model content
The defects of the purpose of this utility model is to solve the above-mentioned prior art, there is provided a kind of radiator, the radiation
Body loads L-shaped minor matters by the short-circuit patch diagonally set in the two of which of each radiating element, two other diagonal setting
Short-circuit patch carry out corner cut processing, to realize circular polarization radiation characteristic, and realize very wide impedance bandwidth and axis ratio band
It is wide.
The another object of the utility model is to provide a kind of millimeter wave circular polarised array antenna, the antenna have easily plus
Work, high gain, small, cost is low, bandwidth, axis than it is wide the characteristics of, can be applied to domestic millimeter wave frequency band mobile service
Middle width strip wireless access system.
The purpose of this utility model can be reached by adopting the following technical scheme that：
A kind of radiator, including radiant panel and multiple radiating elements for being arranged on radiant panel, each radiating element bag
Four short-circuit patch are included, two of which short-circuit patch diagonally sets and is loaded with L-shaped minor matters, two other short-circuit patch is diagonally set
Put and there is corner cut portion.
Further, the radiating element is 16, and 16 radiating elements are arranged in the way of four rows four arrange
On radiant panel.
The another object of the utility model can be reached by adopting the following technical scheme that：
A kind of millimeter wave circular polarised array antenna, including first medium substrate, second medium substrate, the first floor, feed
Network and above-mentioned radiator, the radiator, first medium substrate, the first floor, second medium substrate and feeding network
Set gradually from top to bottom, each radiating element in the radiator passes through the through hole through first medium substrate and first
Floor connects.
Further, multiple gaps are etched with first floor, the radiation in the quantity and radiator in the gap
Element number is corresponding.
Further, the feeding network includes the first power divider and the second power divider, first power
Distributor is multiple, for the radiating element in excitation radiation body, second power divider respectively with multiple first power
Distributor connects, for will be equally distributed over multiple first power dividers from the electromagnetic energy of microwave junction feed-in.
Further, each first power divider includes a plurality of L-shaped bending microstrip feed line.
Further, it is micro- to be equipped with Z-shaped bending for the junction of second power divider and each first power divider
Ribbon feeder.
Further, the antenna further includes the second floor, and second floor is generally aligned in the same plane with feeding network, institute
The second floor is stated to be connected with the first floor by the through hole through second medium substrate.
Further, copper sheet is covered in second floor including two, two cover copper sheet be arranged on microwave junction and with feed
The junction of network.
Further, described two copper sheets that cover are connected by ten through the through hole of second medium substrate and the first floor respectively
Connect.
The utility model has following beneficial effect relative to the prior art：
1st, the radiator of the utility model is provided with four radiating elements, passes through the two of which pair in each radiating element
The short-circuit patch loading L-shaped minor matters that angle is set, two other short-circuit patch diagonally set carries out corner cut processing, to realize entelechy
Change radiation characteristic, and very wide impedance bandwidth and axial ratio bandwidth are realized by corner cut processing.
2nd, the millimeter wave circular polarised array antenna of the utility model is compared with the design of the prior art, only with two layers of Jie
Matter substrate, on the basis of the structure of antenna is simplified, is able to maintain that characteristic of the wide bandwidth axis than high-gain of aerial array, and
Comprising radiator in each radiating element by loading L-shaped minor matters and corner cut, can be in the base of original linear polarized antenna
On plinth improve obtain wide axis than circular polarisation array.
3rd, there is provided the distribution of multiple first power for the feeding network in the millimeter wave circular polarised array antenna of the utility model
Device and the second power divider, each first power divider are used for the radiating element in excitation radiation body, it is curved to which introduce L-shaped
Microstrip feed line is rolled over, equal amplitude feed can be carried out to radiating element；Second power divider is used for will be from microwave junction feed-in
Electromagnetic energy be equally distributed over each first power divider, in the company of the second power divider and the first power divider
Meet place and introduce Z-shaped bending microstrip feed line, help to improve the compactedness of feeding network, while increase between adjacent microstrip feed line
Coupled away from reducing.
4th, the millimeter wave circular polarised array antenna of the utility model feeds array by the way of with mutually feed, no
Need continuously to rotate feeding network, not only increase the compactedness of feeding network, and greatly reduce feeding network
Design difficulty.
5th, in the millimeter wave circular polarised array antenna of the utility model, can also set conplane with feeding network
Plate, the floor connection between the floor and two layer medium substrate, can reduce loss enhancing matching.
6th, in the millimeter wave circular polarised array antenna of the utility model, include setting with the conplane floor of feeding network
Copper sheet is covered in microwave junction and with two of feeding network junction, two cover copper sheet and pass through between through hole and two layer medium substrate
Floor connection, the matching between microwave junction and feeding network can be adjusted, and effectively reduce loss.
7th, the simulation result of the millimeter wave circular polarised array antenna of the utility model shows, in 41GHz~49.7GHz frequency ranges
In the range of, the value of gain curve is both greater than 18dB, has higher gain.
8th, the millimeter wave circular polarised array antenna of the utility model can use the pcb board processing technology of standard to be processed,
Cost is low, and high yield rate, manufacturing process is simple, can meet requirement of the millimeter wave antenna to low cost.
9th, the millimeter wave circular polarised array antenna of the utility model has the advantages that simple in structure, low section and size are small,
Need the parameter that adjusts less, be easily worked design, be adapted to engineer application.
Brief description of the drawings
Fig. 1 is the stereogram of the millimeter wave circular polarised array antenna of the utility model embodiment 1.
Fig. 2 is the structural stratification figure of the millimeter wave circular polarised array antenna of the utility model embodiment 1.
Fig. 3 is the structure chart of layer where the radiator of the utility model embodiment 1.
Fig. 4 is the enlarged drawing at A in Fig. 3.
Fig. 5 is the structure chart of layer where the floor of the utility model embodiment 1.
Fig. 6 is the enlarged drawing at B in Fig. 5.
Fig. 7 is the structure chart of layer where the feeding network of the utility model embodiment 1.
Fig. 8 is the enlarged drawing at C in Fig. 7.
Fig. 9 is that ought scheme greatly at D in Fig. 7.
Figure 10 is the return loss plot of the millimeter wave circular polarised array antenna of the utility model embodiment 1.
Figure 11 is the axis of the millimeter wave circular polarised array antenna of the utility model embodiment 1 than the curve that changes with frequency.
Figure 12 is the curve that the gain of the millimeter wave circular polarised array antenna of the utility model embodiment 1 changes with frequency
Figure.
Figure 13 is the 45GHz E faces directional diagram of the millimeter wave circular polarised array antenna of the utility model embodiment 1.
Figure 14 is the 45GHz H faces directional diagram of the millimeter wave circular polarised array antenna of the utility model embodiment 1.
Wherein, 1- radiators, 11- radiant panels, 12- radiating elements, the first short-circuit patch of 121-, the short circuit patches of 122- second
Piece, the 3rd short-circuit patch of 123-, the 4th short-circuit patch of 124-, 125-L shape minor matters, 126- corner cuts portion, 2- first medium substrates, 3-
First floor, 31- gaps, 4- second medium substrates, 5- feeding networks, 51- feeder panels, the first power dividers of 52-, 521-L
Shape bends microstrip feed line, 522-T shape structures, the second power dividers of 53-, 54-Z shapes bending microstrip feed line, 6- first through hole, 7-
Second through hole, 8- third through-holes, 9- fourth holes, the second floors of 10-, 101- first cover copper sheet, 102- second copper-clad pieces, 11-
Fifth hole.
Embodiment
The utility model is described in further detail with reference to embodiment and attached drawing, but the implementation of the utility model
Mode not limited to this.
Embodiment 1：
As depicted in figs. 1 and 2, a kind of millimeter wave circular polarised array antenna is present embodiments provided, which is 4*4 arrays
Antenna, its radiator 1 for including setting gradually from top to bottom, first medium substrate 2, the first floor 3, second medium substrate 4 with
And feeding network 5, it is seen that five-layer structure is constituted, wherein radiator 1 is located at first layer, and first medium substrate 2 is located at first layer,
First floor 3 is located at third layer, and second medium substrate 4 is located at the 4th layer, and feeding network 5 is located at layer 5.
The first medium substrate 2 and second medium substrate 4 use pcb board, but employ differing dielectric constant and not
With the material of loss angle tangent, material can be any two in FR-4, polyimides, polytetrafluoroethylglass glass cloth and common burning porcelain
Kind.
As shown in Figure 1 to 4, the radiator 1 includes radiant panel 11 and 16 radiating elements 12, radiant panel 11 are attached to
The upper strata of first medium substrate 2,16 12 structures of radiating element are identical, and are arranged in radiant panel in the way of four rows four arrange
On 11, each radiating element 12 includes the first short-circuit patch 121, the second short-circuit patch 122, the 3rd short-circuit patch 123 and the 4th
Short-circuit patch 124, mirror symmetry between the first short-circuit patch 121 and the 3rd short-circuit patch 123, and diagonally set, form one
Electrode couple sub-antenna unit, mirror symmetry between the second short-circuit patch 122 and the 4th short-circuit patch 124, and diagonally set, structure
Into another pair dipole antenna unit；In order to realize circular polarization radiation characteristic, by the first short-circuit patch 121 and the 3rd short circuit
Patch 123 loads L-shaped minor matters 125, and carries out corner cut processing, each shape to the second short-circuit patch 122 and the 4th short-circuit patch 124
Into a corner cut portion 126, it can be seen from figure 4 that after corner cut is handled, the second short-circuit patch 122 and the 4th short-circuit patch
124 be in pentagonal configuration, and very wide impedance bandwidth and axial ratio bandwidth can also be realized by being handled by corner cut；In order to realize that first is short
The short circuit of road patch 121, the second short-circuit patch 122, the 3rd short-circuit patch 123 and the 4th short-circuit patch 124, the first short-circuit patch
121 are connected by the first through hole 6 through first medium substrate 2 with the first floor 3, and the second short-circuit patch 122 passes through through
Second through hole 7 of one medium substrate 2 is connected with the first floor 3, and the 3rd short-circuit patch 123 passes through through first medium substrate 2
Third through-hole 8 is connected with the first floor 3, and the 4th short-circuit patch 124 passes through the fourth hole 9 through first medium substrate 2 and
One floor 3 connects.
As shown in Figure 1, Figure 2, shown in Fig. 5 and Fig. 6, in order to corresponding with 16 radiating elements 12, carved on first floor 3
Erosion has 16 31,16, gap, 31 structures of gap identical and in rectangular configuration, with radiating element 12 also according to four rows four
The mode of row is arranged on the first floor 3, line-spacing X, is arranged away from for Y, and also there is 16 radiating elements 12 the same line-spacing to be
With row away from.
As shown in Figure 1, Figure 2, shown in Fig. 7~Fig. 9, the feeding network 5 includes feeder panel 51, the first power divider 52 and the
Two power dividers 53, feeder panel 51 are attached to the lower floor of second medium substrate 4, the first power divider 52 and the distribution of the second power
Device 53 is arranged on feeder panel 51, and the first power divider 52 is four, and four the first power dividers 52 are using big one
Dividing four microstrip power dividers, each first power divider 52 is used for four radiating elements 12 in excitation radiation body 1, including
Four L-shaped bending microstrip feed lines 521 and three T-shaped structures 522, it is in order to radiating element to introduce L-shaped bending microstrip feed line 521
Equal amplitude feed is carried out, each T-shaped structure is one-to-two T-shaped structure, and three T-shaped structures 522 are denoted as the first T-shaped knot respectively
Structure, the second T-shaped structure and the 3rd T-shaped structure, the two-way of the first T-shaped structure are connected with two microstrip feed lines 521 respectively, the 2nd T
The two-way of shape structure is connected with two other microstrip feed line 521, and the 3rd T-shaped structure is connected with the second power divider 53；Second
Power divider 53 use one point of four small microstrip power divider, for by from the electromagnetic energy of microwave junction feed-in equably
Four the first power dividers 52 are assigned to, in the junction of the second power divider 53 and each first power divider 52,
Z-shaped bending microstrip feed line 54 is equipped with the junction of the 3rd T-shaped structure of the second power divider 53, introduces Z-shaped bending micro-strip
Feeder line 54, helps to improve the compactedness of feeding network 5, while the spacing for increasing adjacent microstrip feed line reduces coupling.
As shown in Figure 1, Figure 2, shown in Fig. 5 and Fig. 7, in order to reduce loss enhancing matching, the millimeter wave circular polarisation battle array of the present embodiment
Array antenna further includes the second floor 10, and the second floor 10 is generally aligned in the same plane with feeding network 5, i.e. the second floor 10 also is located at
Five layers, copper sheet 101 and second copper-clad piece 102 are covered in the second floor 10 including first, and first covers copper sheet 101 and second copper-clad piece 102
It is rectangular configuration, is arranged on microwave junction and the junction with feeding network 5, specially in microwave junction and the second power point
53 junction of orchestration, first covers copper sheet 101 and second copper-clad piece 102 runs through the 5th of second medium substrate 4 by ten respectively
Through hole 11 (i.e. fifth hole 11 shares 20) is connected with the first floor 3, can be adjusted between microwave junction and feeding network 5
Matching, and effectively reduce loss.
In above-described embodiment, the radiator 1, the first floor 3 and feeding network 5 are made of metal material, metal
Material can be any one of aluminium, iron, tin, copper, silver, gold and platinum, or can be that aluminium, iron, tin, copper, silver, gold and platinum are any one
The alloy of kind.
After the dimensional parameters for adjusting the millimeter wave circular polarised array antenna each several part of the present embodiment, pass through calculating and electromagnetic field
Emulation, has carried out verification emulation to the millimeter wave circular polarised array antenna of the present embodiment, as shown in Figure 10, has given the antenna and exist
In 40GHz~50GHz frequency ranges | S11| the curve of parameter (input port return loss) simulation result；It can be seen that
In 40GHz~50GHz band limits, | S11| the value of curve is both less than -10dB, and simulation result shows the millimeter wave circle of the present embodiment
Polarization array antenna has wider impedance bandwidth.As shown in figure 11, the antenna is given in 41GHz~50GHz frequency ranges
Interior axis is than the simulation result curve that changes with frequency；It can be seen that in 41.4GHz~49.3GHz band limits, axis is than bent
The value of line is both less than 3dB, and simulation result shows that the millimeter wave circular polarised array antenna of the present embodiment has wider axial ratio bandwidth.
As shown in figure 12, the array antenna simulation result that the gain in 41GHz~50GHz frequency ranges changes with frequency is given
Curve；It can be seen that in 41GHz~49.7GHz band limits, the value of gain curve is both greater than 18dB, and simulation result shows
The millimeter wave circular polarised array antenna of the present embodiment has higher gain.
Antenna pattern of the model of the millimeter wave circular polarised array antenna HFSS emulation of the present embodiment in 45GHz is as schemed
Shown in 13 and Figure 14, the curve of top is that left-hand circular polarization directional diagram gray line is right-handed circular polarization directional diagram, it can be seen that the battle array
Array antenna directional diagram has less secondary lobe and compared with symmetrical structure, and cross polarization is very low.
Embodiment 2：
The millimeter wave circular polarised array antenna of the present embodiment can also be 5*5 array antennas, 6*6 array antennas etc., or be
The different array antenna of ranks, such as 4*6 array antennas, 6*8 array antennas, radiating element 12,31 and first power of gap point
The quantity of orchestration 52 needs to adjust accordingly.Remaining is the same as embodiment 1.
In conclusion the millimeter wave circular polarised array antenna of the utility model has a longer bandwidth, larger gain, compared with
Wide Circular polarization ratio, and simple in structure, disclosure satisfy that Ministry of Industry and Information's planning be used for millimeter wave frequency band mobile service middle width strip without
The requirement of line access system (42.3-48.4GHz).
The above, is only the utility model patent preferred embodiment, but the protection domain of the utility model patent is simultaneously
Not limited to this, any one skilled in the art is in the scope disclosed in the utility model patent, according to this
Technical solution and its utility model design of utility model patent are subject to equivalent substitution or change, belong to the utility model patent
Protection domain.
Claims (10)
- A kind of 1. radiator, it is characterised in that：Including radiant panel and the multiple radiating elements being arranged on radiant panel, each spoke Penetrating unit includes four short-circuit patch, and two of which short-circuit patch diagonally sets and is loaded with L-shaped minor matters, two other short circuit patch Piece diagonally sets and has corner cut portion.
- A kind of 2. radiator according to claim 1, it is characterised in that：The radiating element is 16,16 spokes Unit is penetrated to be arranged on radiant panel in the way of four rows four arrange.
- A kind of 3. millimeter wave circular polarised array antenna, it is characterised in that：Including first medium substrate, second medium substrate, first Radiator described in floor, feeding network and claim 1 or 2, the radiator, first medium substrate, the first floor, Second medium substrate and feeding network are set gradually from top to bottom, and each radiating element in the radiator is by through first The through hole of medium substrate is connected with the first floor.
- A kind of 4. millimeter wave circular polarised array antenna according to claim 3, it is characterised in that：Carved on first floor Erosion has multiple gaps, and the quantity in the gap is corresponding with the radiating element quantity in radiator.
- A kind of 5. millimeter wave circular polarised array antenna according to claim 3, it is characterised in that：The feeding network includes First power divider and the second power divider, first power divider is multiple, for the spoke in excitation radiation body Unit is penetrated, second power divider is connected with multiple first power dividers respectively, for by from microwave junction feed-in Electromagnetic energy is equally distributed over multiple first power dividers.
- A kind of 6. millimeter wave circular polarised array antenna according to claim 5, it is characterised in that：Each first power distribution Device includes a plurality of L-shaped bending microstrip feed line.
- A kind of 7. millimeter wave circular polarised array antenna according to claim 5, it is characterised in that：The second power distribution The junction of device and each first power divider is equipped with Z-shaped bending microstrip feed line.
- 8. according to a kind of millimeter wave circular polarised array antenna of claim 3-7 any one of them, it is characterised in that：The antenna The second floor is further included, second floor is generally aligned in the same plane with feeding network, and second floor through second by being situated between The through hole of matter substrate is connected with the first floor.
- A kind of 9. millimeter wave circular polarised array antenna according to claim 8, it is characterised in that：Second floor includes Two cover copper sheet, and two cover copper sheet and are arranged on microwave junction and the junction with feeding network.
- A kind of 10. millimeter wave circular polarised array antenna according to claim 9, it is characterised in that：It is described two to cover copper sheet It is connected respectively by ten through holes through second medium substrate with the first floor.
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| CN201721230683.5U CN207282711U (en) | 2017-09-25 | 2017-09-25 | A kind of millimeter wave circular polarised array antenna and its radiator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732445A (en) * | 2017-09-25 | 2018-02-23 | 华南理工大学 | A kind of millimeter wave circular polarised array antenna and its radiant body |
| CN109037930A (en) * | 2018-07-13 | 2018-12-18 | 东南大学 | The Wide band array antenna of micro-strip and feeding substrate integrated waveguide based on stacking |
| CN109921184A (en) * | 2019-02-01 | 2019-06-21 | 东南大学 | Substrate based on low section microstrip feed structures integrates electrical dipole antenna and array |
| CN110380218A (en) * | 2019-05-17 | 2019-10-25 | 东南大学 | A kind of circular polarization plane substrate integrates magnetoelectricity dipole antenna and its array |
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2017
- 2017-09-25 CN CN201721230683.5U patent/CN207282711U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732445A (en) * | 2017-09-25 | 2018-02-23 | 华南理工大学 | A kind of millimeter wave circular polarised array antenna and its radiant body |
| CN107732445B (en) * | 2017-09-25 | 2023-11-17 | 华南理工大学 | Millimeter wave circularly polarized array antenna and radiator thereof |
| CN109037930A (en) * | 2018-07-13 | 2018-12-18 | 东南大学 | The Wide band array antenna of micro-strip and feeding substrate integrated waveguide based on stacking |
| CN109037930B (en) * | 2018-07-13 | 2020-09-11 | 东南大学 | Broadband array antenna based on laminated microstrip and substrate integrated waveguide feed |
| CN109921184A (en) * | 2019-02-01 | 2019-06-21 | 东南大学 | Substrate based on low section microstrip feed structures integrates electrical dipole antenna and array |
| CN110380218A (en) * | 2019-05-17 | 2019-10-25 | 东南大学 | A kind of circular polarization plane substrate integrates magnetoelectricity dipole antenna and its array |
| CN110380218B (en) * | 2019-05-17 | 2020-12-25 | 东南大学 | Circular polarization plane substrate integrated magnetoelectric dipole antenna and array thereof |
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