CN121663216A - Directional diagram reconfigurable irregular subarray-based antenna and method - Google Patents
Directional diagram reconfigurable irregular subarray-based antenna and methodInfo
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Abstract
本发明公开了基于方向图可重构的非规则子阵的天线和方法，天线包括以水平和垂直等间距排列的天线单元；所述天线单元被划分为一驱二子阵和一驱三子阵；所述一驱二子阵包括两个相邻的天线单元；所述一驱三子阵包括三个相邻的天线单元，呈直线形排列或呈L形排列。本发明低成本：T/R组件使用数量远小于常规的有源相控阵天线，只有常规方式的1/3到1/2；易布局：天线阵面尺寸与常规相控阵一致，但使用的通道数量少于常规的相控阵天线，天线阵面后端的有源期间密度大大减小，因此器件与信号线路排列更加宽松便于布局走线；空间小：有源器件所占空间减少，走线与芯片减少使得板层层数减少、厚度降低，两个因素综合使得射频部分的空间更小。
This invention discloses an antenna and method based on a pattern-reconfigurable irregular subarray. The antenna includes antenna elements arranged at equal horizontal and vertical intervals. The antenna elements are divided into a one-to-two subarray and a one-to-three subarray. The one-to-two subarray includes two adjacent antenna elements; the one-to-three subarray includes three adjacent antenna elements arranged in a straight line or an L-shape. This invention offers several advantages: low cost: the number of T/R components used is far less than that of conventional active phased array antennas, only 1/3 to 1/2 of the conventional method; easy layout: the antenna array size is the same as a conventional phased array, but the number of channels used is less than that of a conventional phased array antenna, and the active frequency density at the rear of the antenna array is greatly reduced, thus allowing for more flexible arrangement of devices and signal lines, facilitating layout and routing; small space: the space occupied by active devices is reduced, and the reduction in wiring and chips leads to a reduction in the number of board layers and thickness, resulting in a smaller space for the RF section.
Description
Technical Field
The present invention relates to the field of antennas, and in particular, to an antenna and method based on a pattern reconfigurable irregular subarray.
Background
The antenna is a key device for realizing the mutual conversion between the guiding current in the receiver and the transmitter and the electromagnetic wave in the free space, and is one of the basic components of the wireless communication system. Due to limited gain and insufficient directivity of a single antenna element, modern communication devices commonly employ an array antenna, which works cooperatively with multiple elements to increase gain and directivity. Furthermore, the phase shifter is used for applying controllable phase offset to each antenna unit in the array, so that the direction of the synthesized beam in space can be adjusted as required, which is the core principle of the phased array antenna.
However, in order to realize the independent regulation of the feeding amplitude and the feeding phase of each unit, each antenna unit must be provided with a set of independent feeding channels, and the independent feeding channels mainly comprise an active solid-state transceiver component (T/R component), a radio frequency cable, a radio frequency connector and the like. This results in a significant increase in the cost of the multi-channel phased array system. In the electronic devices used in the radio frequency channels described above, the T/R assembly occupies a major cost.
The main stream of phased array antennas include Brick (bridge), tile (Tile) and the highly integrated architecture based on Antenna packages (AoB) that have been raised in recent years. With the development of technology, phased array antennas continue to evolve towards high integration, and AOB structures are increasingly popular, and component layout density is continuously improved. In a highly integrated phased array antenna, if each unit is provided with a T/R assembly at the back end and the assembly is fully constrained within the confines of each unit, this results in a high concentration of heat generated by the T/R assembly, which presents a significant challenge for the heat dissipation of the phased array antenna. Particularly in space environments where air is lacking as a thermal convection medium, the problem of heat dissipation of phased array antennas is particularly pronounced.
The T/R assembly is arranged for each antenna unit, so that the cost of the phased array antenna is increased, the difficulty in heat dissipation is increased, and the size and the weight of the phased array antenna are increased obviously. In the field of satellite-borne platforms with wider phased array antenna application, the requirements for equipment miniaturization and light weight are particularly urgent. Thus, a way to reduce the use of T/R components in an array has arisen. At present, the directions for achieving the purpose mainly comprise the following two types, but the defects exist:
(1) Sparse array scheme
The sparse array is used for selectively reducing the number of used antenna units under the condition that the physical caliber of the array antenna is unchanged, so as to achieve the purpose of reducing the number of used radio frequency channels. In the process of selecting the sparse unit, the sparse array can be optimized through an algorithm to ensure that grating lobes are not generated and the side lobe inhibition capability is maintained when the sparse array is scanned as much as possible. Although the aperture of the antenna array surface is not changed, the reduction of the number of antenna units tends to reduce the utilization efficiency of the aperture of the array, which makes the gain of the sparse array relatively low in the array scheme with the same aperture.
(2) Irregular subarray scheme
The irregular subarray is a scheme that on the basis of a conventional phased array antenna, a plurality of adjacent antenna units in the array are connected to the same channel, the same phase and amplitude are adopted, so that subarrays with different shapes and different sizes are formed, and the subarrays are combined into the irregular flexible antenna array. The scheme breaks the periodicity of the antenna array surface while reducing the use of the channel number, avoids the generation of grating lobes, and greatly reduces the phase flexibility among the antenna units. At wide angle scans (scan off-axis angles greater than 45 °), the irregular subarrays may exhibit faster side lobe elevation than regular antenna arrays, which limits their application to wide angle scan scenarios.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an antenna and a method based on an irregular subarray with a reconfigurable directional diagram.
The aim of the invention is realized by the following technical scheme:
in a first aspect of the invention, there is provided a pattern reconfigurable irregular subarray-based antenna comprising antenna elements arranged at equal intervals horizontally and vertically;
The antenna units are divided into a first driving two subarrays and a first driving three subarrays, the first driving two subarrays comprise two adjacent antenna units, and the first driving three subarrays comprise three adjacent antenna units which are arranged in a straight line or in an L shape.
Further, the one-drive two subarrays and the one-drive three subarrays use phase shifters with three-gear phase shift values, and the sizes of X correspond to +X DEG, 0 DEG and-X DEG respectively, and are calculated by specific scanning maximum angles of the arrays.
Further, one antenna unit in the one-drive two subarrays is used as a reference to be directly connected with the radio frequency channel, and the other antenna unit is connected with the radio frequency channel through a phase shifter;
The antenna units in the middle of the one-drive three subarrays are directly connected with the radio frequency channel, and the antenna units on two sides are connected with the radio frequency channel through the phase shifters.
In a second aspect of the present invention, there is provided a method for generating an array of antennas based on irregular sub-arrays reconfigurable on a pattern according to the first aspect of the present invention, comprising the steps of:
s101, determining the maximum range of an antenna array, and determining the number x of one-drive two subarrays and the number y of one-drive three subarrays to be used in the array;
S102, encoding an array space into a two-dimensional array with equal size, wherein all values of an initial array are set to be 0;
S103, randomly marking the number of n positions in the array as 1, wherein n=x+y is 1.5, and rounding upwards;
S104, sequentially searching a position with a value of 0 for each position marked as1 around to pair with the position, changing the two paired positions into p, wherein p is initially 2, and the value of p is increased by one every time of marking;
S105, if a pairing-disabled result exists, returning to S103 to reinitialize the array;
S106, after obtaining the array with complete pairing, randomly selecting one-drive-two subarrays, and not repeatedly selecting until one-drive-two subarrays are selected to be adjacent to other two-drive-two subarrays without intervals, splitting the one-drive-two subarrays and respectively adding the two-drive-two subarrays to be adjacent to each other, and randomly distributing the two-drive-two subarrays to the two-drive-two subarrays if a plurality of adjacent one-drive-two subarrays exist;
s107, repeating the step S106 until the number of the one-drive three subarrays meets the requirement, and returning to the step S103 if the number of the one-drive three subarrays is insufficient and all the remaining one-drive two subarrays have no two adjacent one-drive two subarrays;
s108, counting the number of the remaining one-drive-two subarrays, and randomly selecting one-drive-two subarrays to be set to 0, namely blank if the number of the one-drive-two subarrays is 1 more than the required number because of the upward rounding in the step S103.
A third aspect of the present invention provides a pattern calculation method for an antenna based on a pattern reconfigurable irregular subarray according to the first aspect of the present invention, comprising the steps of:
S201, respectively simulating structures of an antenna unit, a first-drive second subarray and a first-drive third subarray by electromagnetic simulation software to obtain far-field pattern results of the antenna unit, the first-drive second subarray and the first-drive third subarray;
s202, independently calculating the composite array factors of each antenna unit, one-drive two-subarrays and one-drive three-subarrays, and multiplying the composite array factors with a unit directional diagram or a subarray directional diagram, wherein the calculation formula is as follows:
wherein, the N is the number of each calculated structure, k is the wave number, d is the cell pitch,For the off-axis angle of the antenna scan,For the phase difference of adjacent antenna elements,For the current amplitude of the excitation unit,Is a cell pattern or a one-drive multi-subarray pattern.
And S203, adding the results of the three parts of the antenna unit, the one-drive two subarrays and the one-drive three subarrays in the S202 to obtain the pattern result of the whole array.
According to a fourth aspect of the present invention, there is provided a method for calculating a shift position of an antenna based on a pattern reconfigurable irregular subarray according to the first aspect of the present invention, comprising the steps of:
s301, during array scanning, the theoretical phase difference between two adjacent units is Wherein d is the spacing between the units,The phase shift phase difference proportion parameter is used for adjusting the direction of the subarray directional diagram and defaults to 1; Calculating the wavelength of the frequency point;
S302, dividing the theoretical phase difference into two cases of horizontal units, namely a y axis, and vertical units, namely an x axis:
Horizontal inter-unit: ;
vertical inter-cell: ;
Wherein the method comprises the steps of A rotation angle for antenna scanning;
S303, if the antenna scans to the maximum angle only in the axial direction Phase shift gear X of antennaP represents a phase-shift phase difference proportion parameter, which is used for adjusting the direction of the subarray directional diagram, and the value of 1;X is adjusted according to the scanning directional diagram condition after calculation;
if the antenna scans to the maximum angle in all directions X is taken asAnd the value of X is adjusted according to the result of the directional diagram after calculation.
The beneficial effects of the invention are as follows:
In an exemplary embodiment of the invention, the antenna unit is divided into a first-drive second subarray and a first-drive third subarray, and the antenna unit has the advantages of (1) low cost, namely the number of T/R components used is far smaller than that of a conventional active phased array antenna, namely only 1/3 to 1/2 of the number of the T/R components used in the conventional mode, (2) easy layout, namely the size of an antenna array surface is consistent with that of the conventional phased array antenna, but the number of channels used is smaller than that of the conventional phased array antenna, the active period density of the rear end of the antenna array surface is greatly reduced, so that devices and signal lines are more loosely arranged to facilitate layout wiring, (3) small space, the occupied space of the active devices is reduced, the number of layers of plate layers is reduced due to the reduction of wires and chips, the thickness is reduced due to the combination of the two factors, the space of a radio frequency part is smaller, and (4) heat is easy to dissipate heat, namely the total quantity of the active channels used by the phased array is reduced to be reduced to 1/3-1/2 of the total heat productivity of the conventional phased array antenna. Meanwhile, the density of the device is reduced, so that the radiating pipes or radiating fins are conveniently arranged below the array surface, and the device is more beneficial to radiating.
Drawings
Fig. 1 is a schematic diagram of an antenna based on a pattern reconfigurable irregular sub-array according to an exemplary embodiment of the present invention;
FIG. 2 is a schematic diagram of a conventional equal phase one-drive multi-scheme in the prior art;
FIG. 3 is a scan pattern provided by an exemplary embodiment of the present invention;
FIG. 4 is a graph showing a comparison of two versions of the scan provided by an exemplary embodiment of the present invention;
FIG. 5 is a schematic diagram of a phase shifter with a two-drive subarray according to an exemplary embodiment of the present invention;
FIG. 6 is a schematic diagram of a phase shifter with a three-subarray drive according to an exemplary embodiment of the present invention;
FIG. 7 is a schematic diagram of a phase shifter with a three-subarray drive according to another exemplary embodiment of the present invention;
FIG. 8 is a schematic diagram of a relationship between phase application and scanning direction in a two-drive subarray according to an exemplary embodiment of the present invention;
FIG. 9 is a schematic diagram of a relationship between phase application and scanning direction in a one-drive three-subarray according to an exemplary embodiment of the present invention;
fig. 10 is a flowchart of a method for generating an array of antennas based on a pattern reconfigurable irregular sub-array according to an exemplary embodiment of the present invention;
Fig. 11 is a flowchart of a method for calculating a pattern of an antenna based on a pattern reconfigurable irregular sub-array according to an exemplary embodiment of the present invention;
fig. 12 is a flowchart of a method for calculating a phase shift position of an antenna based on a pattern reconfigurable irregular sub-array according to an exemplary embodiment of the present invention;
in the figure, a 1-antenna unit, a 2-one-drive two subarrays and a 3-one-drive three subarrays.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully understood from the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Referring to fig. 1, fig. 1 shows a schematic diagram of an antenna based on a pattern reconfigurable irregular subarray according to an exemplary embodiment of the present invention, including antenna elements 1 arranged at equal intervals horizontally and vertically;
The antenna unit 1 is divided into a two-drive subarray 2 and a three-drive subarray 3, wherein the two-drive subarray 2 comprises two adjacent antenna units 1, and the three-drive subarray 3 comprises three adjacent antenna units 1 which are arranged in a straight line or in an L shape.
Specifically, in the present exemplary embodiment, the antenna unit 1 is divided into the one-drive-two subarrays 2 and the one-drive-three subarrays 3, wherein a single free unit that is not excited is allowed to appear during the division, the one-drive-two subarrays 2, i.e., every two antenna units 1, are subjected to one drive, and the one-drive-three subarrays 3, i.e., every three antenna units 1, are subjected to one drive. Has the following advantages:
(1) low cost, T/R components use much less than conventional active phased array antennas, only 1/3 to 1/2 of the conventional way; the array antenna is easy to layout, the size of the array surface of the antenna is consistent with that of a conventional phased array, but the number of channels used is less than that of the conventional phased array antenna, the density of active periods at the rear end of the array surface of the antenna is greatly reduced, so that devices and signal lines are more loosely arranged, wiring is conveniently laid out, 3 the space is small, the occupied space of active devices is reduced, the number of layers of a plate layer is reduced and the thickness is reduced due to the reduction of wiring and chips, the space of a radio frequency part is smaller due to the combination of the two factors, 4 the heat is less, the heat is easy to dissipate, the total quantity of active devices is reduced to 1/3-1/2 of that of the conventional phased array antenna due to the reduction of the active channels used by the phased array, and the total heat productivity of the array surface is synchronously reduced. Meanwhile, the density of the device is reduced, so that the radiating pipes or radiating fins are conveniently arranged below the array surface, and the device is more beneficial to radiating.
In order to use the number of antenna channels as small as possible, the average number of cells in the subarrays is increased as much as possible during design, but the scanning capability of the antenna array is deteriorated too severely by adopting one-drive-three subarrays, so that a compromise scheme is adopted in array plane design, and a mode of combining one-drive-two subarrays 2 and one-drive-three subarrays 3 is adopted. Meanwhile, the outline of the antenna array approximates a polygon or a circle (fig. 1 is a quadrangle).
More preferably, in an exemplary embodiment, the one-drive-two subarrays 2 and one-drive-three subarrays 3 use phase shifters with three shift values, and the sizes of X are calculated from the specific scan maximum angles of the array, respectively corresponding to +x°, 0 °, -x°.
Specifically, in this exemplary embodiment, as shown in fig. 1, the antenna is entirely composed of a first-drive second subarray 2 and a first-drive third subarray 3, wherein the darkest color is a horizontal first-drive second subarray 2, the darkest color is a first-drive third subarray 3, and the darkest color is a longitudinal first-drive second subarray 2. It can be seen that when the conventional equiphase one-drive multi-array scanning is carried out to 45 degrees, the side lobe inhibition index is-9.49 dBc, and after the mode of the exemplary embodiment is adopted, the side lobe inhibition value is changed to-11.94 dBc, and the side lobe inhibition index is improved by about 2.5dB, so that the improvement is very obvious.
Fig. 4 is a comparison of the off-axis 45 scan patterns of the two scan schemes, and it can be seen that the array scan pointing angle is greater with the addition of the phase shifter in the present exemplary embodiment. Through graph peak statistics, the beam peak point of the conventional equal-phase feeding scheme is 44.25 degrees, the beam peak point angle of the present exemplary embodiment is 45 degrees, and the pointing angle of the present exemplary embodiment is closer to the ideal pointing direction of the phased array, and the pointing is more accurate.
In addition, compared with the arrangement mode of phase shifters in part of the prior art, the number of the phase shifters is not reduced, but 1/3 to 1/2 of the phase shifters are changed into phase shifters with only 3 fixed gears, and the complexity and the cost of the phase shifters are far smaller than those of multi-gear phase shifters used by conventional phased array antennas.
More preferably, in an exemplary embodiment, as shown in fig. 5, one antenna unit 1 of the two-drive subarray 2 is directly connected to the rf channel as a reference, and the other antenna unit 1 is connected to the rf channel through a phase shifter;
As shown in fig. 6 and 7, the antenna units 1 in the middle of the one-drive three subarrays 3 are directly connected with the radio frequency channel, and the antenna units 1 at two sides are connected with the radio frequency channel through phase shifters.
Specifically, in the present exemplary embodiment, a method of adding a phase shifter in a subarray is disclosed. When the phase shifter is in a gear position where no phase shift occurs, the phases of the antenna elements 1 in the subarrays are identical. The phase of the antenna directly connected to the radio frequency channel without the insertion of the phase shifter does not change with the phase shift of the phase shifter, and is regarded as a reference of 0 °. More specifically, as shown in fig. 8, the phase relationship during scanning is such that the phase shifter shift state between the two cells is changed only when the projection value of the vector in the scanning angle direction in the arrangement direction of the two cells in the one-drive-two-subarray 2 reaches a certain magnitude, and the phase difference is applied. The relationship between the phase application and the scanning direction in the one-drive-three subarrays 3 is shown in fig. 9, and the principle is the same as that of the one-drive-two subarrays 2, and the description thereof is omitted. Under the condition of maintaining the advantages of the irregular subarrays, the phase shifters are introduced into the subarrays, so that the reconfigurable function of the subarray directional diagram is realized, and the scanning performance of the array on a large angle is optimized in a targeted manner.
It should be noted that, in part of the prior art, in the form of an array of two parts, the phase shifter is connected to a common link between two antenna units 1, and the phase changes of the phase shifter act on both antenna units at the same time, and their phases are identical. In the present exemplary embodiment, the phase shifter is applied between the two antenna units 1, and is used for adjusting and controlling the phase difference between the two antenna units 1, and the phase between the antenna units 1 in the subarray can be flexibly adjusted.
Meanwhile, when the array scans at a large angle, the state of the phase shifter is changed, so that the subarray directional diagram is changed, and the scanning drop and sidelobe suppression are improved. Specifically, the synthesized sub-pattern peak value formed by the ideal unit of the normal phase is also pointed to the normal phase, and when the phase difference exists between the two antenna units 1, the pattern peak value can deviate from the direction of the pattern with smaller phase, because the two units with the same phase need to move by a wave path difference to compensate the difference value of the excitation phase during pattern synthesis. The beam direction is related to the cell spacing, signal frequency and phase difference, and the formula is sin theta = lambda/d delta phi/2 pi, wherein lambda is wavelength, d is cell spacing, delta phi is adjacent cell phase difference. When the cell pattern is shifted in the scanning direction, the cell pattern gain value at the scanning angle increases, and the cell pattern gain value at the angle opposite to the scanning angle decreases. Therefore, the peak gain of the main lobe of the scan is increased, the grating lobe and the side lobe value in the opposite direction are reduced, and the scan drop and the side lobe suppression are improved.
Referring to fig. 10, fig. 10 shows a method for generating an array of antennas based on irregular sub-arrays reconfigurable on a pattern as shown in fig. 1 according to an exemplary embodiment of the present invention, including the steps of:
S101, determining the maximum range of an antenna array, and determining the number x of one-drive two subarrays 2 and the number y of one-drive three subarrays 3 to be used in the array;
S102, encoding an array space into a two-dimensional array with equal size, wherein all values of an initial array are set to be 0;
S103, randomly marking the number of n positions in the array as 1, wherein n=x+y is 1.5, and rounding upwards;
S104, sequentially searching a position with a value of 0 for each position marked as1 around to pair with the position, changing the two paired positions into p, wherein p is initially 2, and the value of p is increased by one every time of marking;
S105, if a pairing-disabled result exists, returning to S103 to reinitialize the array;
S106, after obtaining the array with complete pairing, randomly selecting one first-drive and second-drive subarrays 2 for pairing, and not repeatedly selecting until one first-drive and second-drive subarrays 2 for pairing are selected to be adjacent to other two first-drive and second-drive subarrays 2 without intervals, splitting the two first-drive and second-drive subarrays and respectively adding the two first-drive and second-drive subarrays to the two adjacent first-drive and second-drive subarrays 2 for pairing, and randomly distributing the two first-drive and second-drive subarrays 2 if a plurality of adjacent first-drive and second-drive subarrays 2 exist;
S107, repeating S106 until the number of the one-drive three subarrays 3 meets the requirement, and returning to the step S103 if the number of the one-drive three subarrays 3 is insufficient and all the remaining one-drive two subarrays 2 have no two adjacent one-drive two subarrays 2;
S108, counting the number of the remaining one-drive-two subarrays 2, and randomly selecting one-drive-two subarrays 2 to be set to 0, namely blank if the number of the one-drive-two subarrays 2 is 1 more than the required number because of the upward rounding in the step S103.
Specifically, the present exemplary embodiment provides an array generation method of an antenna based on an irregular subarray of which a pattern is reconfigurable. It should be noted that, a more optimal array structure may be obtained according to the subsequent parameter calculation result after the generation.
Referring to fig. 11, fig. 11 shows a pattern calculation method of an antenna based on a pattern reconfigurable irregular subarray as described in fig. 1 according to an exemplary embodiment of the present invention, including the following steps:
s201, respectively simulating structures of an antenna unit 1, a one-drive two-subarray 2 and a one-drive three-subarray 3 through electromagnetic simulation software to obtain far-field pattern results of the antenna unit 1, the one-drive two-subarray 2 and the one-drive three-subarray 3;
S202, independently calculating the composite array factors of each antenna unit 1, one-drive two-subarray 2 and one-drive three-subarray 3, multiplying the composite array factors with a unit directional diagram or a subarray directional diagram, and the calculation formula is as follows:
wherein, the N is the number of each calculated structure, k is the wave number, d is the cell pitch,For the off-axis angle of the antenna scan,For the phase difference of adjacent antenna elements,For the current amplitude of the excitation unit,Is a cell pattern or a one-drive multi-subarray pattern.
And S203, adding the results of the three parts of the antenna unit 1, the one-drive two-subarray 2 and the one-drive three-subarray 3 in the S202 to obtain the pattern result of the whole array.
Referring to fig. 12, fig. 12 shows a phase shift gear calculation method of an antenna based on a pattern reconfigurable irregular subarray as described in fig. 1 according to an exemplary embodiment of the present invention, which includes the following steps:
s301, during array scanning, the theoretical phase difference between two adjacent units is Wherein d is the spacing between the units,For the off-axis angle of the antenna scan,Calculating the wavelength of the frequency point;
S302, dividing the theoretical phase difference into two cases of horizontal units, namely a y axis, and vertical units, namely an x axis:
Horizontal inter-unit: ;
vertical inter-cell: ;
Wherein the method comprises the steps of A rotation angle for antenna scanning;
S303, if the antenna scans to the maximum angle only in the axial direction Phase shift gear X of antennaP represents a phase-shifting phase difference proportion parameter used for adjusting the direction of the subarray directional diagram, and the value of 1;X is adjusted according to the scanning directional diagram condition after calculation;
if the antenna scans to the maximum angle in all directions X is taken asAnd the value of X is adjusted according to the result of the directional diagram after calculation.
The present exemplary embodiment may calculate the theoretical X angle, and then perform pattern simulation of the array by using the method of fig. 11. And then, the direction diagram of the gear position of the phase shifter, which is adjusted by 0 degrees and is +X degrees, can be compared and calculated to show a better switching angle.
It is apparent that the above examples are given by way of illustration only and not by way of limitation, and that other variations or modifications may be made in the various forms based on the above description by those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (6)
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