CN104701633A - Millimeter-wave lens antenna - Google Patents
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- CN104701633A CN104701633A CN201310656385.2A CN201310656385A CN104701633A CN 104701633 A CN104701633 A CN 104701633A CN 201310656385 A CN201310656385 A CN 201310656385A CN 104701633 A CN104701633 A CN 104701633A
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Abstract
The invention discloses a millimeter-wave lens antenna which comprises a lens, a base, a micro-strip radiating antenna array, a planar slot array and a micro-strip feeder array. The base comprises a first base layer, a second base layer, a third base layer and a fourth base layer which are sequentially arranged from top to bottom; the lens is arranged in the first base layer, and the micro-strip radiating antenna array, the planar slot array and the micro-strip feeder array are respectively correspondingly arranged between the first base layer and the second base layer, between the second base layer and the third base layer and between the third base layer and the fourth base layer. The millimeter-wave lens antenna has the advantages that the micro-strip radiating antenna array can be excited by the micro-strip feeder array of the millimeter-microwave transparent antenna with the structure via the planar slot array, so that electromagnetic waves can be radiated; radiated electromagnetic waves can be directionally processed by the lens, so that high-gain wide beams can be obtained; the wide beams can be directionally radiated, so that the problem that wide beams in 60GHz millimeter-wave frequency bands cannot be directionally radiated under the high-gain conditions at present is effectively solved.
Description
Technical field
The present invention relates to the communications field, be specifically related to a kind of millimeter wave lens antenna.
Background technology
60GHz millimeter wave radio communication has that frequency range is large, transmission rate is fast, fail safe and the advantage such as anti-interference is good, will become the application focus in the fields such as indoor wireless access, car radar, imaging of medical.2013,60GHz millimeter wave radio communication was listed in the great scientific research plan of 2014,2015 and 2016 by " National 863 plan ".But how realizing broad beam high-gain directed radiation at 60GHz millimeter wave frequency band, this is a technical problem not yet resolved so far.
Summary of the invention
The main technical problem to be solved in the present invention is, provides a kind of millimeter wave lens antenna, for solving the problem how realizing broad beam high-gain directed radiation at 60GHz millimeter wave frequency band.
For solving the problems of the technologies described above, the invention provides a kind of millimeter wave lens antenna, comprise lens, pedestal, micro-band radiating antenna battle array, plane gap battle array, microstrip feed line battle array, described pedestal comprises the first pedestal layer, the second pedestal layer, the 3rd pedestal layer and the 4th pedestal layer that set gradually from top to bottom; Described lens are arranged on described first pedestal layer, and described micro-band radiating antenna battle array, plane gap battle array, microstrip feed line battle array respectively correspondence are arranged on described first pedestal layer and described second pedestal layer, described second pedestal layer and described 3rd pedestal layer, between described 3rd pedestal layer and described 4th pedestal layer; Described microstrip feed line battle array carries out radiation by the described micro-band radiating antenna battle array of described plane gap battle array excitation; Described lens are used for the electromagnetic wave of described micro-band radiating antenna battle array radiation to carry out directed radiation.
In an embodiment of the present invention, described micro-band radiating antenna battle array, plane gap battle array, microstrip feed line battle array are face array.
In an embodiment of the present invention, micro-band radiating antenna number of comprising of described micro-band radiating antenna battle array is identical with the microstrip feed line number that described microstrip feed line battle array comprises with the plane gap number that described plane gap battle array comprises.
In an embodiment of the present invention, described micro-band radiating antenna battle array each micro-band radiating antenna comprised and each microstrip feed line that each plane gap that described plane gap battle array comprises and described microstrip feed line battle array comprise are corresponding on described pedestal is arranged.
In an embodiment of the present invention, what the geometric center of the geometric center of each micro-band radiating antenna of described micro-band radiating antenna battle array, the geometric center of each plane gap of described plane gap battle array and each microstrip feed line of described microstrip feed line battle array was distributed in affiliated plane is circumferentially same.
In an embodiment of the present invention, micro-band radiating antenna that position is corresponding on pedestal is on the line vertical with this plane gap with same with the geometric center of plane gap.
In an embodiment of the present invention, micro-band radiating antenna that position is corresponding on pedestal, plane gap are in the plane vertical with this plane gap same with the geometric center of microstrip feed line.
In an embodiment of the present invention, the plane gap number that described micro-band radiating antenna battle array comprises micro-band radiating antenna number, described plane gap battle array comprise and the microstrip feed line number that described microstrip feed line battle array comprises are 4.
In an embodiment of the present invention, 4 plane gaps that described micro-band radiating antenna battle array comprises 4 micro-band radiating antennas, described plane gap battle array comprise and 4 microstrip feed lines that described microstrip feed line battle array comprises all distribute in sphere of movements for the elephants in affiliated plane.
In an embodiment of the present invention, described micro-band radiating antenna, plane gap and microstrip feed line are the strip with orthogonal length direction and Width; In micro-band radiating antenna, plane gap and microstrip feed line that on pedestal, position is corresponding, micro-band radiating antenna is all vertical with the length direction of microstrip feed line with the length direction of plane gap.
In an embodiment of the present invention, the geometric center of the described plane gap arranged on pedestal is determined to the distance of described lens axis according to beam scanning width and yield value.
In an embodiment of the present invention, described first pedestal layer is identical with the thickness of described 4th pedestal layer, and described second pedestal layer is identical with the thickness of described 3rd pedestal layer.
In an embodiment of the present invention, the extension that described lens comprise lens section and are connected with this lens section, described lens section is spheroidal or oval sphere lens portion; Described extension is cylindrical portion.
In an embodiment of the present invention, when lens section is spheroidal lens section, the ratio of the radius R of this spheroidal lens section and the length L of described extension is 4.
The invention has the beneficial effects as follows:
Millimeter wave lens antenna provided by the invention comprises lens, pedestal, micro-band radiating antenna battle array, plane gap battle array, microstrip feed line battle array, wherein, pedestal comprises the first pedestal layer, the second pedestal layer, the 3rd pedestal layer and the 4th pedestal layer that set gradually from top to bottom; Lens are arranged on the first pedestal layer, and micro-band radiating antenna battle array, plane gap battle array, microstrip feed line battle array respectively correspondence are arranged on the first pedestal layer and the second pedestal layer, the second pedestal layer and the 3rd pedestal layer, between the 3rd pedestal layer and the 4th pedestal layer; The millimeter microwave transparent antenna of this structure provided in the present invention, microstrip feed line battle array encourages micro-band radiating antenna battle array to carry out radiation by plane gap battle array, at scioptics, directed radiation process is carried out to the electromagnetic wave of radiation, therefore can while obtaining high-gain broad beam, directed radiation is realized to this broad beam, well solves the existing problem that can not realize broad beam high-gain directed radiation at 60GHz millimeter wave frequency band.
Accompanying drawing explanation
Fig. 1 is the structural representation of millimeter wave lens antenna in the embodiment of the present invention two;
Fig. 2 is the distribution schematic diagram of each array of millimeter wave lens antenna in the embodiment of the present invention two;
Fig. 3 is the return loss performance test schematic diagram of millimeter wave lens antenna in the embodiment of the present invention two;
Fig. 4 is the directional diagram schematic diagram of millimeter wave lens antenna when 60GHz place, phi=0 ° in the embodiment of the present invention two;
Fig. 5 is the directional diagram schematic diagram of millimeter wave lens antenna when 60GHz place, phi=90 ° in the embodiment of the present invention two.
Embodiment
Millimeter wave lens antenna provided by the invention can be applicable to 60GHz millimetre-wave attenuator, it comprises lens, pedestal, micro-band radiating antenna battle array, plane gap battle array, microstrip feed line battle array, wherein, pedestal comprises the first pedestal layer, the second pedestal layer, the 3rd pedestal layer and the 4th pedestal layer that set gradually from top to bottom; Lens are arranged on the first pedestal layer, and micro-band radiating antenna battle array, plane gap battle array, microstrip feed line battle array respectively correspondence are arranged on the first pedestal layer and the second pedestal layer, the second pedestal layer and the 3rd pedestal layer, between the 3rd pedestal layer and the 4th pedestal layer; The millimeter microwave transparent antenna of this structure provided in the present invention, microstrip feed line battle array encourages micro-band radiating antenna battle array to carry out radiation by plane gap battle array, at scioptics, directed radiation process is carried out to the electromagnetic wave of radiation, therefore while obtaining high-gain broad beam, directed radiation can be realized to this broad beam.After tested, millimeter wave lens antenna provided by the invention is in the working frequency range of 57.5-66GHz, and return loss is all less than-10db, and the beamwidth that its yield value is greater than 10dbi can reach 35 degree.By reference to the accompanying drawings the present invention is described in further detail below by embodiment.
Embodiment one:
The millimeter wave lens antenna that the present embodiment provides comprises lens, pedestal, micro-band radiating antenna battle array, plane gap battle array, microstrip feed line battle array.In the present embodiment, pedestal is mainly used in as lens, micro-band radiating antenna battle array, plane gap battle array, microstrip feed line battle array provide physical support, and it specifically can comprise the first pedestal layer, the second pedestal layer, the 3rd pedestal layer and the 4th pedestal layer that set gradually from top to bottom; Lens are arranged on the first pedestal layer, specifically can be arranged on the upper surface of the first pedestal layer, also by being fastened on the first pedestal layer with the sidewall of the first pedestal layer.Micro-band radiating antenna battle array, plane gap battle array, microstrip feed line battle array respectively correspondence are arranged on the first pedestal layer and the second pedestal layer, the second pedestal layer and the 3rd pedestal layer, between the 3rd pedestal layer and the 4th pedestal layer; Also namely micro-band radiating antenna battle array is set between the first pedestal layer and the second pedestal layer, between the second pedestal layer and the 3rd pedestal layer, plane gap battle array is set, between 3rd pedestal layer and the 4th pedestal layer, microstrip feed line battle array is set, such setting can make microstrip feed line battle array encourage micro-band radiating antenna battle array to carry out radiation by plane gap battle array, lens are then for carrying out directed radiation by the electromagnetic wave of micro-band radiating antenna battle array radiation, to reach while obtaining high-gain broad beam, this broad beam is realized to the object of directed radiation.
The battery ripple that lens in the present embodiment can be used for giving off carries out re-orientation processes, has the ability reaching wave beam surface sweeping effect by changing the antenna type that is placed in above lens plane or surface antenna to the distance of lens centre axis.The extension that lens in the present embodiment comprise lens section and are connected with this lens section, lens section is spheroidal or oval sphere lens portion, is also that the lens in the present embodiment can be ellipsoid lens or accurate packaged lens; Extension in the present embodiment is preferably cylindrical portion.When originally selecting accurate packaged lens, the ratio of the radius R of spheroidal lens section and the length L of extension is preferably 4; Certainly, this ratio can carry out selection setting according to actual conditions.
In the present embodiment, the lens section of lens and extension select commaterial, in order to reduce the loss in wave traveling process, the material of the preferred low conductivity of di-lens material; On the other hand, be more tending towards in a wireless communication system to the material in selection high-k.To sum up consider, in the present embodiment, preferably can manufacture lens, its DIELECTRIC CONSTANT ε=11.7, refractive index by silicon materials
meanwhile, in order to ensure focus features, the present embodiment selects eccentricity l and dielectric permittivity ε to reach the ellipsoid lens of a certain ratio, and this proportionate relationship is
in order to easy to process in reality, select the accurate hemispherical lens of expansion.Accurate packaged lens after expansion is close to ellipsoid lens, and the spherical wave that the aerial radiation be placed in its focus can go out by such lens is converted into directional beam in the far-field region of antenna.
In the present embodiment, the cylindrical base that the extension that pedestal specifically can be size and size and lens matches, also the first pedestal layer namely comprised, the second pedestal layer, the 3rd pedestal layer and the 4th pedestal layer are also all cylindrical base layer, and pedestal layer can adopt identical dielectric material.In the present embodiment, can arrange the first pedestal layer further identical with the thickness of the 4th pedestal layer, the second pedestal layer is identical with the thickness of the 3rd pedestal layer; The twice that second pedestal layer and the 3rd pedestal layer thickness can be the thickness of the first pedestal layer and the second pedestal layer is preferably set.In the present embodiment, the first pedestal layer, the second pedestal layer, the 3rd pedestal layer are preferably identical with the radius of the spheroidal lens section of lens with the radius of the 4th pedestal layer.
In the present embodiment, micro-band radiating antenna battle array, plane gap battle array, microstrip feed line battle array are preferably face array.Certainly, for some specific application scenarioss, also micro-band radiating antenna battle array, plane gap battle array, microstrip feed line battle array all can be set to linear array.The distribution of each element that the face array in the present embodiment refers in array is not distribute along straight line, and the distribution of each element that linear array then refers in array distributes along straight line.Meanwhile, in order to ensure adequacy and the integrality of antenna collection signal, it is identical with the microstrip feed line number that microstrip feed line battle array comprises with the plane gap number that plane gap battle array comprises that micro-band radiating antenna number that micro-band radiating antenna battle array comprises is set in the present embodiment.And preferably all can be set to even number, such as 4,8 etc., concrete number can be selected to arrange according to concrete application scenarios.
In the present embodiment, preferably arrange that micro-band radiating antenna battle array each micro-band radiating antenna comprised and each microstrip feed line that each plane gap that plane gap battle array comprises and microstrip feed line battle array comprise are corresponding on pedestal to be arranged, this correspondence can be one_to_one corresponding, i.e. a corresponding plane gap of micro-band radiating antenna and a microstrip feed line.Such as, suppose micro-band radiating antenna number that micro-band radiating antenna battle array comprises, plane gap number that plane gap battle array comprises and the microstrip feed line number that microstrip feed line battle array comprises be when being all 4, then all elements of above-mentioned array is divided into 4 groups, each group comprises micro-band radiating antenna, plane gap and a microstrip feed line, and the position that micro-band radiating antenna, plane gap and microstrip feed line that each group comprises are arranged on pedestal is corresponding respectively.The micro-band radiating antenna being preferably arranged on position on pedestal corresponding is on the line vertical with this plane gap with same with the geometric center of plane gap.Micro-band radiating antenna that position is corresponding on pedestal, plane gap are in the plane vertical with this plane gap same with the geometric center of microstrip feed line.
In the present embodiment, what the geometric center of the geometric center of each micro-band radiating antenna of preferred micro-band radiating antenna battle array, the geometric center of each plane gap of plane gap battle array and each microstrip feed line of microstrip feed line battle array was distributed in affiliated plane is circumferentially same.And can the axis of lens be the center of circle.In addition, due to the focus characteristics of lens, can there is significant change along with plane gap geometric center to the change of di-lens axial line distance in the performance of antenna, and its change is mainly manifested on the beam scanning width of antenna, main beam direction and yield value.By observing and carefully analyzing optimization Simulation result, find the increase along with described distance, main beam direction departs from Z-direction angle to be increased, and beam scanning width increases, but meanwhile gain can corresponding reduction, and this just requires to do a compromise between beam scanning width and yield value.Therefore, the geometric center of the plane gap arranged on pedestal in the present embodiment specifically can be determined according to beam scanning width and yield value to the distance of lens axis.
In the present embodiment, micro-band radiating antenna, plane gap and microstrip feed line all can select the strip with orthogonal length direction and Width, such as, all can be set to rectangle; In micro-band radiating antenna, plane gap and microstrip feed line that on pedestal, position is corresponding, micro-band radiating antenna is all vertical with the length direction of microstrip feed line with the length direction of plane gap.
Embodiment two:
In order to be more convenient for understanding the present invention, below in conjunction with a concrete millimeter wave lens antenna, the present invention will be further described.
Shown in Figure 1, the millimeter wave lens antenna shown in this figure comprises lens 1, pedestal 2, arranges micro-band radiating antenna battle array, plane gap battle array, microstrip feed line battle array on the base 2.The cylindrical portion 12 that lens 1 comprise hemispherical lens portion 11 and extend along this hemispherical lens portion, in this enforcement, the radius R in hemispherical lens portion 11 is 6mm, and the length L that cylindrical portion 12 extends is 1.5.mm.Pedestal 2 comprises the first pedestal layer 21, second pedestal layer 22, the 3rd pedestal layer 23 and the 4th pedestal layer 24 that set gradually from top to bottom; The radius R of cylindrical base 2 can be equal with the radius R in hemispherical lens portion 11, be also set to 6mm; Lens 1 are arranged on the upper of the first pedestal layer 21, are provided with micro-band radiating antenna battle array between the first pedestal layer 21 and the second pedestal layer 22; Be provided with plane gap battle array between second pedestal layer 22 and the 3rd pedestal layer 23, between the 3rd pedestal layer 23 and the 4th pedestal layer 24, be provided with microstrip feed line battle array.It should be noted that the plane gap battle array in the present embodiment is formed separately by a component, also can directly by being formed on the face that the second pedestal layer 22 and the 3rd pedestal layer 23 match.Wherein, the thickness of the first pedestal layer 21 and the 4th pedestal layer 24 is equal, and the thickness of the second pedestal layer 22 and the 3rd pedestal layer 23 is equal, and the thickness of the second pedestal layer 22 and the 3rd pedestal layer 23 is the twice of the thickness of the first pedestal layer 21 and the 4th pedestal layer 24.First pedestal layer 21, second pedestal layer 22, the 3rd pedestal layer 23 and the 4th pedestal layer 24 can adopt identical dielectric material to make.
In the present embodiment, the energisation mode of employing is difference excitation; In order to ensure adequacy and the integrality of antenna collection signal within the scope of a larger angle, must make antenna pattern at top a coning angle space internal characteristic basically identical, below in conjunction with the demand to determining that the process of radiating element number simply illustrates.First tentatively emulate the lens antenna of single radiating element, the yield value that can obtain an element antenna can reach higher level, has the characteristic of high-gain, but shortcoming to be the beamwidth of now antenna very narrow.So, secondly, with comprise lens axis and the plane vertical with plane gap for symmetrical centre, second radiating element is added in the symmetric position of radiating element, become 2 cell arrays, two ports add constant amplitude reverse energization and emulate, to keep and the effect improving antenna direction characteristic, reach expansion beamwidth, increase yield value further simultaneously.In order to ensure adequacy and the integrality of antenna collection signal within the scope of a larger angle, must make antenna pattern at top a coning angle space internal characteristic basically identical.Therefore, finally, according to same thinking, by two unit radiation element arrays with lens axis for rotating shaft, in respective respective planes, turn clockwise 90 °, become 4 cell arrays, opposite end mouth difference encourage.The distribution map of each array obtained is as shown in Figure 2:
Micro-band radiating antenna battle array shown in Fig. 2, plane gap battle array, microstrip feed line battle array all comprise 4 elements.And as known in the figure, 4 plane gaps that 4 micro-band radiating antennas, plane gap battle arrays that micro-band radiating antenna battle array comprises comprise and 4 microstrip feed lines that microstrip feed line battle array comprises all distribute in sphere of movements for the elephants in affiliated plane.Wherein, micro-band radiating antenna 3, plane gap 4 and microstrip feed line 5 are all set to rectangle.In each group, the geometric center of micro-band radiating antenna 3, plane gap 4 same perpendicular on the vertical line of on plane gap 4, the geometric center of micro-band radiating antenna 3, plane gap 4 and microstrip feed line 5 then same perpendicular on the vertical plane of on plane gap 4, the length direction of micro-band radiating antenna 3, plane gap 4 is parallel, and vertical with the length direction of microstrip feed line 5.In the present embodiment, if the length of micro-band radiating antenna 3 is 0.5mm, width is 0.45mm; The length of plane gap 4 is 0.8mm, and width is 0.14mm; The selection of microstrip feed line 5 size is mainly from the viewpoint of its characteristic impedance, if its length is 2.4mm, width is 0.18mm, ensures that its characteristic impedance is 50 ohm.Carry out emulating the result obtained with this antenna to distinguish as in Figure 3-5.
Figure 3 shows that the return loss performance resolution chart of the lens antenna that the present embodiment provides.In engineering, general definition return loss is less than frequency range corresponding to-10db is working frequency range.The working frequency range of lens antenna that the present embodiment provides as seen from Figure 3 is 57.491-66.838GHz, substantially contains the free licensed band of whole 57-66GHz.
The lens antenna that Fig. 4 and Fig. 5 provides for the present embodiment is at 60GHz place directional diagram.
The directional diagram of lens antenna when Fig. 4 is phi=0 °, the directional diagram of lens antenna when Fig. 5 is phi=90 °.Can find out that the directional diagram of the lens antenna when phi=0 ° and phi=90 ° is substantially identical, show that lens antenna characteristic in a coning angle plane is basically identical.In Fig. 4 and Fig. 5, lens antenna gain is 14.4dbi, 3db width is 28.8 °, and the beamwidth that gain is greater than 10dbi can reach 35 °.
Above content is in conjunction with concrete execution mode further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (14)
1. a millimeter wave lens antenna, it is characterized in that, comprise lens, pedestal, micro-band radiating antenna battle array, plane gap battle array, microstrip feed line battle array, described pedestal comprises the first pedestal layer, the second pedestal layer, the 3rd pedestal layer and the 4th pedestal layer that set gradually from top to bottom; Described lens are arranged on described first pedestal layer, and described micro-band radiating antenna battle array, plane gap battle array, microstrip feed line battle array respectively correspondence are arranged on described first pedestal layer and described second pedestal layer, described second pedestal layer and described 3rd pedestal layer, between described 3rd pedestal layer and described 4th pedestal layer; Described microstrip feed line battle array carries out radiation by the described micro-band radiating antenna battle array of described plane gap battle array excitation; Described lens are used for the electromagnetic wave of described micro-band radiating antenna battle array radiation to carry out directed radiation.
2. millimeter wave lens antenna as claimed in claim 1, it is characterized in that, described micro-band radiating antenna battle array, plane gap battle array, microstrip feed line battle array are face array.
3. millimeter wave lens antenna as claimed in claim 2, it is characterized in that, micro-band radiating antenna number that described micro-band radiating antenna battle array comprises is identical with the microstrip feed line number that described microstrip feed line battle array comprises with the plane gap number that described plane gap battle array comprises.
4. millimeter wave lens antenna as claimed in claim 3, it is characterized in that, described micro-band radiating antenna battle array each micro-band radiating antenna comprised and each microstrip feed line that each plane gap that described plane gap battle array comprises and described microstrip feed line battle array comprise are corresponding on described pedestal to be arranged.
5. millimeter wave lens antenna as claimed in claim 3, it is characterized in that, it is circumferentially same that the geometric center of the geometric center of each micro-band radiating antenna of described micro-band radiating antenna battle array, the geometric center of each plane gap of described plane gap battle array and each microstrip feed line of described microstrip feed line battle array is distributed in affiliated plane.
6. millimeter wave lens antenna as claimed in claim 4, it is characterized in that, micro-band radiating antenna that position is corresponding on pedestal is on the line vertical with this plane gap with same with the geometric center of plane gap.
7. millimeter wave lens antenna as claimed in claim 4, it is characterized in that, micro-band radiating antenna that position is corresponding on pedestal, plane gap are in the plane vertical with this plane gap same with the geometric center of microstrip feed line.
8. millimeter wave lens antenna as claimed in claim 3, it is characterized in that, the plane gap number that micro-band radiating antenna number that described micro-band radiating antenna battle array comprises, described plane gap battle array comprise and the microstrip feed line number that described microstrip feed line battle array comprises are 4.
9. millimeter wave lens antenna as claimed in claim 8, it is characterized in that, 4 plane gaps that 4 micro-band radiating antennas that described micro-band radiating antenna battle array comprises, described plane gap battle array comprise and 4 microstrip feed lines that described microstrip feed line battle array comprises all distribute in sphere of movements for the elephants in affiliated plane.
10. millimeter wave lens antenna as claimed in claim 9, it is characterized in that, described micro-band radiating antenna, plane gap and microstrip feed line are the strip with orthogonal length direction and Width; In micro-band radiating antenna, plane gap and microstrip feed line that on pedestal, position is corresponding, micro-band radiating antenna is all vertical with the length direction of microstrip feed line with the length direction of plane gap.
11. millimeter wave lens antennas as described in any one of claim 3-10, it is characterized in that, the geometric center of the described plane gap arranged on pedestal is determined to the distance of described lens axis according to beam scanning width and yield value.
12. millimeter wave lens antennas as described in any one of claim 1-10, it is characterized in that, described first pedestal layer is identical with the thickness of described 4th pedestal layer, and described second pedestal layer is identical with the thickness of described 3rd pedestal layer.
13. millimeter wave lens antennas as described in any one of claim 1-10, it is characterized in that, the extension that described lens comprise lens section and are connected with this lens section, described lens section is spheroidal or oval sphere lens portion; Described extension is cylindrical portion.
14. millimeter wave lens antennas as claimed in claim 13, is characterized in that, when lens section is spheroidal lens section, the ratio of the radius R of this spheroidal lens section and the length L of described extension is 4.
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| US11799193B2 (en) | 2015-10-14 | 2023-10-24 | Apple Inc. | Electronic devices with millimeter wave antennas and metal housings |
| WO2020151074A1 (en) * | 2019-01-23 | 2020-07-30 | 东南大学 | Broadband circularly-polarized millimeter wave multi-feed multi-beam lens antenna |
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