JP2001189622A - Shared array antenna for two frequency bands - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shared array antenna for two frequency bands, with which a grating lobe does not occur in both frequency bands, mutual coupling between element antennas or influence cased by blocking upon a radiation pattern is settled within an allowable range and the element antennas are not physically interfered. SOLUTION: This array antenna is provided with basic array arrangement, with which an interval between the element antenna to operate in the low frequency band and the element antenna to operate in the high frequency band is equal to or more than an element antenna interval in the high frequency band, and real arrangement is determined by thinning the element antenna, with which the influence caused by blocking upon the radiation pattern exceeds the allowable range, or physically interfered element antenna from this basic arrangement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual frequency band shared array antenna used in two frequency bands separated by about twice or more.

[0002]

2. Description of the Related Art FIGS. 11 and 12 show, for example, Naohisa Goto and Kazuko Kamiyama, "Element Arrangement Method and Gain of Dual-Frequency Array Antenna" (Technical Report AP81-40, published by IEICE, June 1981). a layout view showing a conventional two-frequency band array antenna shown in month 26), in FIG., 1 is the second frequency band sharing device antenna operating in a low frequency band F _L and a high frequency band F _H position, 2 position of the antenna elements operating at a low frequency band F _L, 3 is the position of the element antenna operating in a high frequency band F _H.

Next, the operation will be described. In the dual frequency band shared array antenna shown in FIG. 11, a dual frequency band shared element antenna is periodically arranged as an element antenna, and the element antenna interval is set so that grating lobes do not appear in a high frequency band. By deciding,
The same aperture shares two frequency bands. Further, in the second frequency band array antenna shown in FIG. 12, separated by the element antenna operating in the antenna elements and the high frequency band F _H operating element antenna in the low frequency band F _L, arranged respectively alternately Thus, the same aperture shares two frequency bands.

[0004]

Since the conventional dual frequency band shared array antenna is configured as described above,
When sharing in two frequency bands separated by about twice or more, there were the following problems. (1) In the second frequency band array antenna shown in FIG. 11, when determining the antenna element spacing so as not to have a grating lobe at a high frequency band F _H, the low frequency band F _L
In, there is a problem that the mutual coupling between the element antennas becomes strong because the interval between the element antennas is extremely small as compared with the wavelength, and the element pattern in the array state is disturbed. (2) In the second frequency band array antenna shown in FIG. 12, when determining the antenna element spacing so as not to have a grating lobe at a high frequency band F _H, the low frequency band F _L
In the case, the mutual coupling between the element antennas becomes stronger because the element antenna interval becomes extremely smaller than the wavelength, and the problem that the element pattern in the array state is disturbed,
Conversely, when determining the antenna element spacing so as not to have grating lobes in the low frequency band F _L, the high frequency band F
_{In the case of H} , there is a problem that a grating lobe occurs because the interval between element antennas is larger than the wavelength. In the case of using a height different antennas to the antenna upper part from the base plate by the frequency band used, such as a dipole antenna or a notch antenna as the antenna element, is disposed in the vicinity of the antenna elements operating at a low frequency band F _L the element antenna operating in high frequency band F _H is affected by the blocking coming from difference in size of the antenna from the antenna elements, there is a problem that the element pattern is disturbed. Furthermore, in the case of a planar array in which element antennas are arranged in the same plane like a patch antenna, there is another problem that element antennas in both frequency bands physically interfere with each other.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and does not generate grating lobes in both frequency bands, and allows mutual coupling between element antennas and blocking to affect the radiation pattern. It is an object of the present invention to obtain a frequency band shared array antenna that falls within the range and does not physically interfere with the element antenna.

[0006]

Means for Solving the Problems] 2 band array antenna according to the invention, the vector P _H ^* that represents a deployable position of the antenna elements of the frequency band ^{_{F H, P H * = m}} H (d H1 ^{_{v 1 * + 0.5d H2 v 2}} *) +
The ^{_{n H (d H1 v 1 *}} -0.5d H2 v 2 *) vector representing the deployable position of the antenna elements of the frequency band ^{_{F L P L *, P L}} * = m L 2k 1 d H1 v 1 * _{+ n L k 2 d H2 v} 2
^{* _{Or, P L * = m L k}} 1 (d H1 v 1 * + 0.5d
^{_{H2 v 2 *) + n L}} k 2 (d H1 v 1 * -1.5d H2
v ₂ ^{*) _{or, P L * = m L k}} 1 (d H1 v 1 * + 1.5d
^{_{H2 v 2 *) + n L}} k 2 (d H1 v 1 * -0.5d H2
v 2 ^_*) and then, and the frequency band F _L possible placement positions of the antenna elements of P _L ^* and, one or more frequency bands F possible placement positions of the _H of the antenna elements P _H in the vicinity thereof
^{In addition to *} , conditions for actually arranging the element antennas at these positions are added, and the element antennas are arranged by thinning out the positions at which the element antennas can be arranged in the two frequency bands. .

[0007] second frequency band array antenna according to the present invention, use polarization at both frequency bands are all v ₁ ^* is the direction of linear polarization, the deployable position of the antenna elements of the frequency band F _H represents the vector ^{_{P H *, P H * =}} m H (d H1 v 1 * + 0.5d H2 v 2 *) + n H (d H1 v 1 * -0.5d H2 v 2 *) frequency band _{F L} of the element the vector _P ^{L *} representing a deployable position of the ^{_{antenna, P L * = m L 2k}} 1 d H1 v 1 * + n L k 2 d H2 v 2
^* + _D H1 _v ^{1 * _{or, P L * = m L k}} 1 (d H1 v 1 * + 0.5d
^{_{H2 v 2 *) + n L}} k 2 (d H1 v 1 * -1.5d H2
^{_{v 2 *) + d H1 v}} 1 * ^{_{or, P L * = m L k}} 1 (d H1 v 1 * + 1.5d
^{_{H2 v 2 *) + n L}} k 2 (d H1 v 1 * -0.5d H2
^{_{v 2 *) + d H1 v}} 1 * and then, and the frequency band _F disposed possible positions of the antenna elements of the _{L P} ^{L *,} 1 in the vicinity
The condition for actually arranging the element antennas at these positions is added between the positions P _H ^{* where} the element antennas of one or more frequency bands F _H can be arranged, and
The element antennas are arranged by thinning out the positions where the element antennas can be arranged in one frequency band.

[0008] Dual frequency band shared array antenna according to the present invention
Tena has both polarizations used in both frequency bands.₂ ^*One
Linear polarization, and the frequency band F_HElement antenna
Vector P that represents the position where it can be placed_H ^*To P_H ^*= M_H(D_H1v₁ ^*+ 0.5d_H2v₂ ^*) +
n_H(D_H1v₁ ^*-0.5d_H2v₂ ^*) Frequency band F_LRepresents the possible positions of the element antennas
Vector P_L ^*To P_L ^*= M_L2k₁d_H1v₁ ^*+ N_Lk₂d_H2v₂
^*+ 0.5d_H2v₂ ^*Or P_L ^*= M_Lk₁(D_H1v₁ ^*+ 0.5d
_H2v₂ ^*) + N_Lk₂(D_H1v₁ ^*-1.5d_H2
v₂ ^*) + 0.5d_H2v₂ ^*Or P_L ^*= M_Lk₁(D_H1v₁ ^*+ 1.5d
_H2v₂ ^*) + N_Lk₂(D_H1v₁ ^*-0.5d_H2
v₂ ^*) + 0.5d_H2v₂ ^*And the frequency band
F_LPosition P at which element antennas can be arranged_L ^*And near
One or more nearby frequency bands F_HElement antenna
Possible position P_H ^*Between these positions actually
After adding the condition for arranging the element antenna to
Element antennas can be arranged in the above two frequency bands
The element antennas are arranged by thinning
You.

[0009] second frequency band array antenna according to the present invention, the k _1, k _2, in the frequency band F _L, and the largest integer among which satisfies the condition which does not generate grating lobes within the desired beam scanning range It was done.

[0010] second frequency band array antenna according to the present invention, the frequency band F disposed possible positions of _L antenna elements P _L ^*, deployable position of the antenna elements of the N frequency bands F _H in the vicinity thereof between P _Hi ^*, 2 frequency of these actual conditions added to place the antenna elements in position, the position P _L ^* can be used in both frequency bands of the frequency band F _H and the frequency band F _L or arranging the common element antenna, or, or to place the antenna elements of the frequency band F _L, or whether to place the antenna elements of the frequency band F _H, or is either or not arranged antenna elements, and, in the case of arranging the antenna elements in position P _L ^* 2 frequency sharing element antenna or frequency band F _L, the position P _Hi ^* is the element antennas of the frequency band F _H It is obtained by the condition that except from the location possible positions.

[0011] second frequency band array antenna according to the present invention, the frequency band F disposed possible positions of _L antenna elements P _L ^*, deployable position of the antenna elements of the N frequency bands F _H in the vicinity thereof between P _Hi ^*, 2 frequency of these actual conditions added to place the antenna elements in position, the position P _L ^* can be used in both frequency bands of the frequency band F _H and the frequency band F _L or arranging the common element antenna, or, or to place the antenna elements of the frequency band F _H, or is either or not arranged antenna elements, and arranging two frequency sharing element antenna to a position P _L ^* when the position P _Hi ^* is obtained by the condition that excluded from placeable position antenna elements of the frequency band F _H.

[0012] A dual frequency band shared array antenna according to the present invention.
Tena has frequency band F_LPossible position of element antenna
Place P_L ^*And N frequency bands F in the vicinity_HElement A
Position P where antenna can be placed_Hi ^*These positions between
Conditions added to actually place the element antenna on the device
At position P_L ^*Has a frequency band F_LOf element antennas
Or the frequency band F_HOf element antennas
Or no element antenna.
And the position P_L ^*Frequency band F _LElement
When arranging the antenna, position P_Hi ^*(I = 1 ~
N) is the frequency band F_HWhere the element antennas can be placed
From the condition.

[0013] second frequency band array antenna according to the present invention, the frequency band F disposed possible positions of _L antenna elements P _L ^*, deployable position of the antenna elements of the N frequency bands F _H in the vicinity thereof P _Hi ^* and between either of these actual conditions added to place the antenna elements in position, the position P _L ^* to place antenna elements frequency band F _L, or, placing the antenna elements It is either one of not, and, provided that when arranging the antenna elements of the frequency band F _L at the position P _L ^* is located P _Hi ^* excluding the deployable position of the antenna elements of the frequency band F _H It is what it was.

[0014] second frequency band array antenna according to the invention is an array of the element antennas of the array antenna in the frequency band F element antenna and the frequency band of the antenna array _H F _L are arranged in different planes, respectively, The condition added for actually arranging the element antennas is a condition that the effects of mutual coupling of the arranged element antennas are within an allowable range.

The second frequency band array antenna according to the present invention, both the antenna elements of the array antenna in the frequency band F antenna element of the array antenna and the frequency band of the _H F _L is located in the dipole antenna and the ground plane the same plane The dual frequency element antenna is a log-periodic antenna having the same plane as the plane as a ground plane.

The second frequency band array antenna according to the present invention, an array antenna of the array antenna and the frequency band F _L frequency band F _H is either a plane array those element antennas are arranged in the same plane In addition, the condition added to actually arrange the element antennas is a condition that the arranged element antennas do not physically interfere with each other.

[0017] The second frequency band array antenna according to the invention, both the antenna elements of the array antenna in the frequency band F antenna element of the array antenna and the frequency band of the _H F _L is a patch antenna, 2 frequency sharing element antennas Is an annular patch antenna.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 1 to 3
2 frequency band shared array antenna according to Embodiment 1 of the present invention
FIG. 4 is a layout diagram showing positions where teners can be arranged, and
11 indicated by ◎ is the low frequency band F_LElement that works with
Antenna and high frequency band F_HOf the element antenna that works with
Position where all can be arranged, 13 indicated by ○ is high frequency
Band F_HWhere only element antennas operating on
It is. Here, in the case of a triangular array, the high frequency band F_Hof
Vector P representing position 13 where element antenna can be arranged_H
^*Is generally P_H ^*= M_H(D_H1v₁ ^*+ 0.5d_H2v₂ ^*) +
n_H(D_H1v₁ ^*-0.5d_H2v₂ ^*) It can be expressed as. Where m_H, N_HIs any integer
Number, v₁ ^*, V₂ ^*Indicates the direction of the element antenna array.
A unit vector orthogonal to d_H1, D_H2Are each
v₁ ^*, V₂ ^*It is the element antenna interval in the direction. to this
On the other hand, the low frequency band F_LElement antenna can be arranged
Vector P representing position_L ^*As in Sequence 1 shown in FIG.
, P_L ^*= M_L2k₁d_H1v₁ ^*+ N_Lk₂d_H2v₂
^*  Where m_L, N_LIs any integer, k₁, K₂Each
An integer that satisfies₁≧ 1 and k₂≧ 2 also
Is P, as in array 2 shown in FIG._L ^*= M_Lk₁(D_H1v₁ ^*+ 0.5d
_H2v₂ ^*) + N_Lk₂(D_H1v₁ ^*-1.5d_H2
v₂ ^*) Where m_L, N_LIs any integer, k₁, K₂Each
An integer that satisfies₁≧ 1 and k₂≧ 2 also
Is P, as in array 3 shown in FIG._L ^*= M_Lk₁(D_H1v₁ ^*+ 1.5d
_H2v₂ ^*) + N_Lk₂(D_H1v₁ ^*-0.5d_H2
v₂ ^*) Where m_L, N_LIs any integer, k₁, K₂Each
An integer that satisfies₁≧ 1 and k₂≧ 2
ing. That is, under the above conditions, the low frequency band F_LElement
By determining the position where the child antenna can be arranged, P_L
^*= P_H ^*Position 11 where the element antennas
Excluding low frequency band F_LElement antenna can be arranged
Position 11 and high frequency band F_HElement antennas can be arranged
The minimum element antenna spacing from the position 13 is set to the high frequency band F
_HElement antenna spacing d of the element antenna_H1, D_H2Less than
To increase the mutual coupling between element antennas.
I can do it. Specifically, P_L ^*Of the above three conditions
Depending on the choice of deviation, the basic arrangement as shown in FIGS.
Conceivable. k₁, K₂Is the element antenna spacing d
_H1, D_H2Similarly, the low frequency band F_LSetting
Meter frequency and high frequency band F_HOf the design frequency and the bee
In any frequency band depending on the scanning angle range
Satisfy the condition that does not generate grating lobe
It is a value to be determined, but for simplicity,
Is k₁, K₂Is 1 or 2.

FIG. 4 is a structural view showing a case where element antennas are actually arranged in the basic arrangement shown in FIG. 2, FIG. 4 (a) is a plan view thereof, and FIG. 4 (b) is a sectional view thereof. . In the figure, 22 is the element antenna and the high frequency band F low frequency band either the element antennas operating is placed in position 11 can be arranged at _H F _L of antenna elements operating at a low frequency band F _L, 23 high frequency band F _H antenna elements placed in the high frequency band F _H of the element placement possible positions of the antennas 13, 24 is a base plate. When this state to place the antenna elements 22 and 23, as shown in FIG. 4 (a), the antenna elements 22 of the low frequency band _{F L} is a high frequency band _{F H} of the antenna elements 23a, 23b, or 23c and physically interfere as shown in FIG. 4 (b), each of the element antennas 22, 23, v ₂ ^* when configured in polarization dipole antenna is a high frequency band F _H disposed in the vicinity of the antenna elements 22 Working element antenna 2
The elements 3a, 23b, and 23c are affected by blocking caused by a difference in antenna size due to the element antenna 22.

FIGS. 5 to 8 show a first embodiment of the present invention.
Indicating the arrangement position of the dual-band shared array antenna
In the figure, 31 indicated by ◎ is a low frequency band.
Area F _LAnd high frequency band F_HDual-frequency element operating with
The position where the child antenna is arranged.
Band F_LThe position where the element antenna 22 operating at
33 indicated by ○ indicates a high frequency band F_HElement operating with
The position at which the tenner 23 is arranged, and 34 indicated by
This is a position thinned out from the positions 11 and 13 where positions can be arranged.
The arrangement of these element antennas is the same as the element antenna shown in FIG.
Physical interference and blocking issues in tena arrays
In order to avoid this, the low frequency band F in FIG. _LWorks with
Element antenna and high frequency band F_HDevice operating with
Position 2 where both antennas can be placed.
Element antenna or low frequency band F_LElement operating with
When arranging the antenna 22, the element antenna shown in FIG.
High frequency at positions corresponding to the antennas 23a, 23b and 23c.
Band F_HThat no element antenna that operates on
After adding the matter, two frequency bands F_H, F_LSmell
From the position where the element antenna can be placed
An array of tenas.

[0021] Specifically, FIG. 5 is any of the antenna elements operating at the antenna elements operating at a low frequency band F _L high frequency band F _H which can position in FIG. 1 11
The, or arranging two frequency sharing element antennas, placing the element antenna 22 operating at a low frequency band F _L or,
Or arranging the antenna elements 23 that operate at high frequency band F _H, or is either one of neither place any element antennas, also of only the element antenna 23 operating at high frequency band F _H is locatable in position 13 is either or not placed or placing element antenna 23 operating at high frequency band F _H, also located 11 to 2 frequency sharing element antennas or the low-frequency band element antenna 2
In the case where the antenna element 2 is arranged, the actual element antenna is not provided on the condition that the element antenna 23 for the high frequency band is not arranged at the position corresponding to the position of the element antennas 23a, 23b and 23c with respect to the position of the element antenna 22 in FIG. Is determined. In this case, the sequence of the actual antenna elements, so that the performance of such side-lobe characteristics in the low frequency band F _L, and the high frequency band F _H in the array antenna satisfies the desired performance, for example, using genetic algorithm It can be determined by a thinning method or the like. The design procedure for that purpose, first, operates at a low frequency band F _L in position 11 either a possible arrangement of the element antennas 23 to operate the device antenna 22 operating at a low frequency band F _L in the high frequency band F _H Whether to place the element antenna 22 or not
Determined by conventional thinning method using a genetic algorithm so as to satisfy the desired performance at low frequency band F _L, then,
High frequency band F element only element antenna 23 operating at _H is shown in FIG. 4 from the deployable position 13 antenna 23
a, except positions corresponding to 23c, whether placing element antenna 23 operating at high frequency band F _H, at a thinning method using a genetic algorithm so as to satisfy the desired performance in the high frequency band F _H determined, the antenna elements operating at a low frequency band F _L at positions corresponding to the element antenna 23b 2
Conditions when placing both the antenna elements 23 operating at 2 and high frequency band F _H is to be considered a method of arranging two frequency sharing element antenna in this position, also, that the first, described above to satisfy, so as to satisfy the desired performance in both frequency bands of the low frequency band F _L and a high frequency band F _H, the method is also conceivable that thinned simultaneously 2 frequency using a genetic algorithm.

FIG. 6 shows the low frequency band F_LDevice operating with
Antenna 22 and high frequency band F_HElement antenna that works with
In position 11 where any of 23 can be arranged,
Or a high frequency band F_HWorks with
Element antenna 23 to be arranged, or
The condition that either the element antenna of
Other conditions are the same as those in FIG. Figure
7 is the low frequency band F_LOperate with element antenna 22 and high
Frequency band F_HAny of the element antennas 23 operating with
Is located at a position 11 where the low frequency band F _LWorks with
Or the high frequency band F_Hso
An operating element antenna 23 is arranged or
The condition of either not disposing the displaced element antenna
Other conditions are the same as in FIG.
You. In these cases, the actual device is formed in the same procedure as in FIG.
The arrangement of the antenna can be determined.

[0023] As described above, according to the first embodiment, by determining the deployable position of the antenna elements 22 of the low frequency band F _L under the above conditions, P L ^{_* =} P _{H *} to become element antenna excluding the deployable position 11, can be placed in the low frequency band F arrangeable position and a high frequency band of the antenna element 22 of _L F _H of the element antenna 23 position 1
3 can be set to be _{equal to} or longer than the element antenna distances d _H1 and d _H2 of the element antenna 23 in the high frequency band F _H , so that the disturbance of the element antenna pattern in the array state can be reduced and the physical distance between the element antennas Element antennas are thinned out in consideration of the conditions for avoiding the problem of global interference and blocking, so that good performance in side lobe characteristics and the like can be realized even in two frequency bands.

Embodiment 2 FIG. FIG. 8 shows an embodiment of the present invention.
Possible to arrange a dual-frequency band array antenna according to state 2.
It is a layout diagram showing a position, in the figure, 12 indicated by x.
Is the low frequency band F_LOnly element antennas that operate on
Position, and the polarization used in both frequency bands is
v₂ ^*Direction of linear polarization, and correspond to the basic arrangement shown in FIG.
And the low frequency band F_LPossible position of element antenna
0.5d_H2Only v₂ ^*Element when moved in the direction
It shows a position where an antenna can be arranged. This place
If P _L ^*= P_H ^*Possible position of element antenna
The position 11 does not exist. FIG. 9 shows the basic arrangement shown in FIG.
Configuration showing the case where element antennas are actually arranged in a row
FIG. 9A is a plan view, and FIG.
FIG. In the figure, 22 is a low frequency band F_L
In a position where an element antenna operating in
Frequency band F_LThe element antenna 23 has a high frequency band F
_HHigh frequency placed at position 13 where element antennas can be arranged
Wavenumber band F_H, 24 is a ground plane. this
At this time, as shown in FIG._LElement
Physical interference with the secondary antenna 22 or as shown in FIG.
As shown in FIG.
Difference in antenna size when configured with
High frequencies that will be affected by blocking
Several bands F_HElement antennas 23a and 23b
You.

FIG. 10 shows a second embodiment according to the second embodiment of the present invention.
FIG. 3 is a layout diagram showing the layout position of a frequency band shared array antenna, in which 32 indicated by x is a low frequency band _FL.
Element antenna 23 to operate in a position of arranging the antenna elements 22 operating, 33 shown in ○ in the high frequency band F _H
Is the position where is arranged, and 34 indicated by is the position thinned out from the positions 12 and 13 where the element antennas can be arranged. The sequences of these antenna elements, in order to avoid physical interference or blocking problems in the array antenna elements shown in FIG. 9, the antenna elements 22 that operate in the low frequency band F _L
To but deployable position 12, when arranging the antenna elements 22 that operate in the low frequency band F _L is the element antenna 23a for element antenna 22 in FIG. 9, the position corresponding to 23b in the high frequency band F _H After adding a condition that no operating element antenna is arranged, the element antennas are arranged by thinning out the positions where the element antennas can be arranged in the two frequency bands F _L and F _H. At this time, the actual arrangement of the element antennas can be determined in the same procedure as in FIG.

As described above, according to the second embodiment, the high frequency band F _{H with} respect to the position of the element antenna 22
Are those capable of the number of positions that do not place the antenna elements 23 into two, thereby, since the locatable element antenna 23 in the high frequency band F _H position increases, more, to increase the degree of freedom of design it can.

In the second embodiment, both frequency bands
Area F_L, F_HThe polarization used at₂ ^*Directional line
Polarization, low frequency band with respect to the basic arrangement shown in FIG.
Area F _LThe position where the element antenna 22 can be arranged is 0.5d
_H2Only v₂ ^*Antenna arrangement when moving in the
The possible positions are shown, but both frequency bands F_L, F_HAt
The polarization used is v₁ ^*Direction of linear polarization, and
For the basic arrangement shown, the low frequency band F_LElement en
The position where the tener 22 can be arranged is 0.5d._H1Only v₁ ^*One
When the antenna is moved in the direction
The same effect can be obtained.

In the above embodiment, k ₁ , k
_2, in the frequency band F _L, if the largest integer among which satisfies the condition which does not generate grating lobes within the desired beam scanning range, the two frequency bands F _L, because the grating lobes are not generated in F _H , it is possible to realize a radiation pattern with low side lobe levels, it is possible to increase the distance between the antenna elements of the frequency band F _L, can reduce the influence of mutual coupling.

Furthermore, in the above embodiment, a dipole antenna for the frequency band F element of the array antenna of _H antenna and the frequency band F ground plane 24 the same plane as the antenna element of the array antenna none is _L, 2 Frequency The common element antenna is placed on the ground plane 24
If As is log-periodic antennas with, since it equivalent to the size of the antenna elements using the magnitude of the second frequency sharing element antennas in the frequency band F _L, when considering the conditions for arranging the antenna elements, Since the two types of element antennas can be considered under the same conditions, the design becomes easy. Also, since the radiation characteristics of the dipole antenna and the log-periodic antenna in the same frequency band can be made substantially the same, the generation of grating lobes due to the use of two types of element antennas in one frequency band can be reduced. A lobe-level radiation pattern can be realized.

Furthermore, in the above embodiment, both the antenna elements of the array antenna in the frequency band F element antenna and the frequency band of the antenna array _H F _L is a patch antenna, 2 frequency sharing element antenna circular patch If as is the antenna, since it equivalent to the size of the antenna elements using the magnitude of the second frequency sharing element antennas in the frequency band F _L, when considering the conditions for arranging the antenna elements, the two Since the element antenna can be considered under the same conditions, the design becomes easy. Further, since the radiation characteristics of the patch antenna and the ring patch antenna in the same frequency band can be made substantially the same, the generation of grating lobes due to the use of two types of element antennas in one frequency band can be reduced. A radiation pattern at a side lobe level can be realized.

[0031]

As is evident from the foregoing description, according to the present invention, the vector _P ^{H *} that represents a deployable position of the antenna elements of the frequency band ^{_{F H, P H * = m}} H (d H1 v 1 * +0. 5d _H2 v ₂ ^*) +
The ^{_{n H (d H1 v 1 *}} -0.5d H2 v 2 *) vector representing the deployable position of the antenna elements of the frequency band ^{_{F L P L *, P L}} * = m L 2k 1 d H1 v 1 * _{+ n L k 2 d H2 v} 2
^{* _{Or, P L * = m L k}} 1 (d H1 v 1 * + 0.5d
^{_{H2 v 2 *) + n L}} k 2 (d H1 v 1 * -1.5d H2
v ₂ ^{*) _{or, P L * = m L k}} 1 (d H1 v 1 * + 1.5d
^{_{H2 v 2 *) + n L}} k 2 (d H1 v 1 * -0.5d H2
v 2 ^_*) and then, and the frequency band F _L possible placement positions of the antenna elements of P _L ^* and, one or more frequency bands F possible placement positions of the _H of the antenna elements P _H in the vicinity thereof
^In addition, a condition for actually arranging the element antennas at these positions is added between them, and the element antennas are arranged by decimating from the positions where the element antennas can be arranged in the above two frequency bands. since the, the distance between the antenna elements used in the frequency band F element used in _H antenna and the frequency band F _L, and limits the array of actual antenna elements and away above the antenna element spacing used in at least the frequency band F _H Therefore, the influence of the mutual coupling on the radiation pattern can be reduced. Also, two frequency bands F _L, by thinning out simultaneously antenna elements of F _H, the effect that can be two frequency bands F _L, with F _H realizes radiation characteristics such as low sidelobe level is obtained.

According to the present invention, use in both frequency bands
Both polarizations are v₁ ^*Direction linear polarization, frequency band
Area F_HVector representing the position where the element antennas can be arranged
P_H ^*To P_H ^*= M_H(D_H1v₁ ^*+ 0.5d_H2v₂ ^*) +
n_H(D_H1v₁ ^*-0.5d_H2v₂ ^*) Frequency band F_LRepresents the possible positions of the element antennas
Vector P_L ^*To P_L ^*= M_L2k₁d_H1v₁ ^*+ N_Lk₂d_H2v₂
^*+ D_H1v₁ ^*Or P_L ^*= M_Lk₁(D_H1v₁ ^*+ 0.5d
_H2v₂ ^*) + N_Lk₂(D_H1v₁ ^*-1.5d_H2
v₂ ^*) + D_H1v₁ ^*Or P_L ^*= M_Lk₁(D_H1v₁ ^*+ 1.5d
_H2v₂ ^*) + N_Lk₂(D_H1v₁ ^*-0.5d_H2
v₂ ^*) + D_H1v₁ ^*And the frequency band F_Lof
Position P where element antenna can be arranged_L ^*And 1 near it
One or more frequency bands F_HElement antenna arrangement
Possible position P_H ^*Between these positions actually the element
After adding the conditions for arranging the antenna,
Possible locations of element antennas in two frequency bands
It is configured to arrange element antennas by thinning out from
And v₁ ^*The frequency band F_Hso
Element antenna used and frequency band F_LElement used in
At least the frequency band F_HElement used in
Actually so that it is separated by at least 1/2 of the antenna spacing
Because the array of element antennas is limited, mutual coupling
Of the radiation pattern can be reduced. Ma
Two frequency bands F_L, F_HElement antennas at the same time
, Two frequency bands F_L, F_HAt low
Radiation characteristics such as side lobe level can be realized.
A clear effect can be obtained.

According to the present invention, use in both frequency bands
Both polarizations are v₂ ^*Direction linear polarization, frequency band
Area F_HVector representing the position where the element antennas can be arranged
P_H ^*To P_H ^*= M_H(D_H1v₁ ^*+ 0.5d_H2v₂ ^*) +
n_H(D_H1v₁ ^*-0.5d_H2v₂ ^*) Frequency band F_LRepresents the possible positions of the element antennas
Vector P_L ^*To P_L ^*= M_L2k₁d_H1v₁ ^*+ N_Lk₂d_H2v₂
^*+ 0.5d_H2v₂ ^*Or P_L ^*= M_Lk₁(D_H1v₁ ^*+ 0.5d
_H2v₂ ^*) + N_Lk₂(D_H1v₁ ^*-1.5d_H2
v₂ ^*) + 0.5d_H2v₂ ^*Or P_L ^*= M_Lk₁(D_H1v₁ ^*+ 1.5d
_H2v₂ ^*) + N_Lk₂(D_H1v₁ ^*-0.5d_H2
v₂ ^*) + 0.5d_H2v₂ ^*And the frequency band
F_LPosition P at which element antennas can be arranged_L ^*And near
One or more nearby frequency bands F_HElement antenna
Possible position P_H ^*Between these positions actually
After adding the condition for arranging the element antenna to
Element antennas can be arranged in the above two frequency bands
To arrange element antennas by thinning them out from different positions
So v₂ ^*Frequency band for linear polarization
F_HAntenna and frequency band F used in_LElement used in
At least the frequency band F_HFor
At least 1/2 of the element antenna spacing
Because the actual arrangement of element antennas is limited,
The effect on the radiation pattern due to coupling can be reduced
You. Also, two frequency bands F_L, F_HElement antenna
At the same time, two frequency bands F_L, F
_HTo achieve radiation characteristics such as low sidelobe levels.
The effect that can be obtained is obtained.

According to the present invention, the k _1, k _2, in the frequency band F _L, and then, is the largest integer among which satisfies the condition which does not generate grating lobes within the desired beam scanning range since the two frequency bands F _L, is a grating lobe in the F _H does not occur, an effect that can realize a radiation pattern with low side-lobe level is obtained, it is possible to increase the distance between the antenna elements of the frequency band F _L, mutual coupling Influence can be reduced.

According to this invention, the frequency band F _L and element placement possible position of the antenna P _L ^* of, deployable position P _Hi antenna elements of the N frequency bands F _H in the vicinity thereof
^* And between the additional criteria in order to place actually element antennas at these positions, the position P _L ^* frequency band F _H and the frequency band F 2 frequency sharing device that can be used in both frequency bands of the _L is the or placing the antenna, or, or to place the antenna elements of the frequency band F _L, or whether to place the antenna elements of the frequency band F _H, or is either or not arranged antenna elements, and, Position P _L
When placing the antenna elements of the second frequency sharing element antenna or frequency band F _L is the ^*, the position P _Hi ^* is constructed as a condition that excluded from placeable position antenna elements of the frequency band F _H an element antenna used in a frequency band F _H, the element antenna used in a frequency band F _L, 2 two frequency bands F _L, for using the three antenna elements and antenna elements used in F _H, the array of antenna elements Deterioration of radiation characteristics due to the restriction can be reduced. Furthermore, by limiting the arrangement of the element antennas, the influence on the radiation pattern due to mutual coupling can be reduced, and the influence on the radiation pattern due to blocking does not exceed an allowable range or physically interfere. The effect of being able to realize a simple arrangement of element antennas is obtained.

According to the present invention, the frequency band F_LElement
Position P where antenna can be arranged_L ^*And N nearby
Frequency band F_HPosition P at which element antennas can be arranged_Hi
^*Element antennas are actually placed at these positions between
The condition added to perform_L ^*Has a frequency band
F_HAnd frequency band F_L2 frequencies that can be used for both frequencies
A shared element antenna is arranged or the frequency band F
_HOf the element antenna or the element antenna
Is not arranged, and the position P_L ^*To
When a dual frequency element antenna is arranged, the position P
_Hi ^*Is the frequency band F_HPossible position of element antenna
The frequency is excluded from the
Several bands F_HAntenna and two frequency bands
F_L, F _HAnd two types of element antennas
Due to the use of the antenna, the antenna
Radiation characteristic degradation can be minimized and low cost
Is possible. In addition, restrict the arrangement of element antennas
Effect on the radiation pattern due to mutual coupling
Can be reduced, and the
The effect on the firing pattern may exceed the
The arrangement of element antennas that does not interfere
The effect that can be obtained is obtained.

[0037] According to the present invention, the frequency band F _L and element placement possible position of the antenna P _L ^* of, deployable position P _Hi antenna elements of the N frequency bands F _H in the vicinity thereof
^* Between the, these actual conditions added to place the antenna elements in position, or the position P _L ^* to place antenna elements frequency band F _L, or, elements of the frequency band F _H Either the antenna is arranged or the element antenna is not arranged, and the position P _L ^*
When placing the antenna elements of the frequency band F _L is the,
Since the position P _Hi ^* is constructed as a condition that excluded from placeable position antenna elements of the frequency band F _H, 2 kinds of antenna elements used in the antenna elements and the frequency band F _L used in the frequency band F _H order to use the antenna elements, together with the cost reduction is possible, two frequency bands F _L, is by the ratio of F _H it is possible to realize a configuration that does not use a hard 2 frequency sharing element antenna implementation. Furthermore, by limiting the arrangement of the element antennas, the influence on the radiation pattern due to mutual coupling can be further reduced, and the influence on the radiation pattern due to blocking does not exceed an allowable range or does not physically interfere. The effect of realizing such an arrangement of element antennas is obtained.

According to this invention, the frequency band F _L and element placement possible position of the antenna P _L ^* of, deployable position P _Hi antenna elements of the N frequency bands F _H in the vicinity thereof
^* Between the these indeed conditions added to place the antenna elements in position, or the position P _L ^* to place antenna elements frequency band F _L, or, if not disposed element antennas And the position P _L ^*
When placing the antenna elements of the frequency band F _L is the,
Position since P _Hi ^* is constructed as a condition that excluded from placeable position antenna elements of the frequency band F _H, the linear polarization element used in frequency band F element used in _H antenna and the frequency band F _L since the use of two types of element antennas with antenna, as well as a cost can be reduced, two frequency bands F _L, it is by the ratio of F _H realizing a structure that does not use a hard 2 frequency sharing element antenna realization be able to. Furthermore, by restricting the arrangement of the element antennas, the influence on the radiation pattern due to mutual coupling can be further reduced, and the influence on the radiation pattern due to blocking exceeds an allowable range.
The effect of being able to realize an array of element antennas that does not physically interfere is obtained.

[0039] According to the invention, an array of the element antennas of the array antenna in the frequency band F element antenna and the frequency band of the antenna array _H F _L are arranged in different planes, respectively, actually place the element antennas the additional criteria for, since the placed element antenna effect of mutual coupling with each other and adapted to the condition that falls within the allowable range, the element used in the frequency band F _H by element antenna used in a frequency band F _L Since the effect on the radiation pattern due to the blocking on the antenna is within the allowable range, the effect of reducing the influence on the radiation pattern can be obtained.

According to the present invention, both the antenna elements of the array antenna in the frequency band F antenna element of the array antenna and the frequency band of the _H F _L is a dipole antenna to the ground plane the same plane, 2 frequency sharing element antennas since there was configured to be a log-periodic antenna for a ground plane of the planar and coplanar, since it equivalent to the size of the antenna elements using the magnitude of the second frequency sharing element antennas in the frequency band F _L, arranged antenna elements When considering the conditions for performing these operations, the two types of element antennas may be considered under the same conditions, which facilitates the design. In addition, since the radiation characteristics of the dipole antenna and the logarithmic periodic antenna at the same frequency can be made substantially the same, the generation of grating lobes due to the use of two types of element antennas for one frequency band can be reduced. The effect that a radiation pattern of a level can be realized is obtained.

According to this invention, the array antenna of the array antenna and the frequency band F _L frequency band F _H is both a planar array of these antenna elements are arranged in the same plane, actually the element antenna Since the conditions added for arranging are arranged so that the arranged element antennas do not physically interfere with each other,
Frequency band F element used in _H antenna and the frequency band F _L
When arranged on the same plane and an element antenna to be used, the two frequency bands F _H, but the antenna elements used in F _L can not be placed by physical interference is a problem, thereby, so as not to interfere The effect that the arrangement | sequence of a simple element antenna can be implement | achieved is acquired.

[0042] According to the present invention, both the antenna elements of the array antenna in the frequency band F element antenna and the frequency band of the antenna array _H F _L is a patch antenna, 2 frequency sharing element antenna with circular patch antenna Having constructed is so, since it equivalent to the size of the antenna elements using the magnitude of the second frequency sharing element antennas in the frequency band F _L, when considering the conditions for arranging the antenna elements, the two elements Since the antenna may be considered under the same conditions, the design becomes easy. Further, since the radiation characteristics of the patch antenna and the ring patch antenna in the same frequency band can be made substantially the same, the generation of grating lobes due to the use of two types of element antennas in one frequency band can be reduced. The effect of realizing the radiation pattern at the side lobe level is obtained.

[Brief description of the drawings]

FIG. 1 is a layout diagram showing positions where a dual-frequency-band shared array antenna according to a first embodiment of the present invention can be arranged.

FIG. 2 is a layout diagram showing positions where a dual-frequency band array antenna according to Embodiment 1 of the present invention can be arranged.

FIG. 3 is a layout diagram showing positions where a dual-frequency band shared array antenna according to the first embodiment of the present invention can be arranged.

FIG. 4 is a configuration diagram showing a case where element antennas are actually arranged in the basic arrangement shown in FIG. 1;

FIG. 5 is a layout diagram showing a layout position of a dual frequency band shared array antenna according to the first embodiment of the present invention.

FIG. 6 is a layout diagram showing a layout position of a dual-frequency-band shared array antenna according to the first embodiment of the present invention.

FIG. 7 is a layout diagram showing a layout position of a dual-frequency-band shared array antenna according to the first embodiment of the present invention.

FIG. 8 is a layout diagram showing a position where a two-frequency band shared array antenna according to a second embodiment of the present invention can be arranged.

FIG. 9 is a configuration diagram showing a case where element antennas are actually arranged in the basic arrangement shown in FIG. 8;

FIG. 10 is a layout diagram showing a layout position of a dual-frequency-band shared array antenna according to a second embodiment of the present invention.

FIG. 11 is a layout diagram showing a conventional two-frequency band shared array antenna.

FIG. 12 is a layout diagram showing a conventional dual frequency band shared array antenna.

[Explanation of symbols]

11 A position where both an element antenna operating in a low frequency band and an element antenna operating in a high frequency band can be arranged, 12 A position where only an element antenna operating in a low frequency band can be arranged, 13 An operation in a high frequency band Position where only element antenna can be arranged, 22 element antenna in low frequency band, 23, 23a, 23b, 23c element antenna in high frequency band, 24 ground plane, 31 dual frequency shared element operating in low frequency band and high frequency band The positions where the antennas are arranged, 32 where the element antennas operating in the low frequency band are arranged, 33 positions where the element antennas operating in the high frequency band are arranged, and 34 positions where the element antennas can be arranged are thinned out.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazufumi Nishizawa, 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Yoshio Inazawa 2-3-2, Marunouchi, Chiyoda-ku, Tokyo F term in Mitsubishi Electric Corporation (reference) 5J021 AA05 AA09 AA13 AB01 GA05 JA03

Claims (12)

[Claims] 1. A two-frequency band shared array antenna sharing an aperture in two frequency bands of F H and F L (F H > F L ), wherein a vector representing a position where an element antenna of a frequency band F H can be arranged. the P H *, P H * = m H (d H1 v 1 * + 0.5d H2 v 2 *) +
n H (d H1 v 1 * -0.5d H2 v 2 *) , where, m H, n H is an arbitrary integer, v 1 *, v 2 * is the unit vector orthogonal to each other representing the direction of the element antenna array , d H1, d H2 respectively v 1 *, when the v 2 * direction of the element antenna spacing, the vector P L * representing a deployable position of the antenna elements of the frequency band F L, P L * = m L 2k 1 d H1 v 1 * + n L k 2 d H2 v 2
* Here, m L and n L are arbitrary integers, k 1 and k 2 are integers satisfying the following conditions, respectively, k 1 ≧ 1 and k 2 ≧ 2, or P L * = m L k 1 (d H1 v 1 * + 0.5d
H2 v 2 *) + n L k 2 (d H1 v 1 * -1.5d H2
v 2 * ) Here, m L and n L are arbitrary integers, k 1 and k 2 are integers satisfying the following conditions, respectively, k 1 ≧ 1 and k 2 ≧ 2, or P L * = m L k 1 (d H1 v 1 * + 1.5d
H2 v 2 *) + n L k 2 (d H1 v 1 * -0.5d H2
v 2 * ) Here, m L and n L are arbitrary integers, k 1 and k 2 are integers satisfying the following conditions, respectively, k 1 ≧ 1 and k 2 ≧ 2, and the frequency band FL is Between the position P L * where the element antenna can be arranged and the position P H * where the element antenna of one or more frequency bands F H in the vicinity can be arranged, the element antenna is actually placed at these positions. A two-frequency band shared array antenna, wherein element antennas are arranged by decimating from positions where element antennas can be arranged in the two frequency bands, after adding conditions for arrangement. 2. FH, FL(FH> FLTwo frequencies
Dual frequency band shared array antenna that shares aperture in several bands
, The polarization used in both frequency bands is v1 *
Direction linear polarization, frequency band FHRepresents the possible positions of the element antennas
Vector PH *To PH *= MH(DH1v1 *+ 0.5dH2v2 *) +
nH(DH1v1 *-0.5dH2v2 *) Where mH, NHIs any integer, v1 *, V2 *Is
Unit vectors orthogonal to each other indicating the direction of the sub-antenna array
Le, dH1, DH2Is v1 *, V2 *Element of direction
Frequency band FLRepresents the possible positions of the element antennas
Vector PL *To PL *= ML2k1dH1v1 *+ NLk2dH2v2
*+ DH1v1 * Where mL, NLIs any integer, k1, K2Each
An integer that satisfies1≧ 1 and k2≧ 1 and
Is PL *= MLk1(DH1v1 *+ 0.5d
H2v2 *) + NLk2(DH1v1 *-1.5dH2
v2 *) + DH1v1 * Where mL, NLIs any integer, k1, K2Each
An integer that satisfies1≧ 2 and k2≧ 1 and
Is PL *= MLk1(DH1v1 *+ 1.5d
H2v2 *) + NLk2(DH1v1 *-0.5dH2
v2 *) + DH1v1 *  Where mL, NLIs any integer, k1, K2Each
An integer that satisfies1≧ 1 and k2≧ 2
And the frequency band FLElement antenna can be arranged
Position PL *And one or more frequency bands in the vicinity
Area FHPosition P at which element antennas can be arrangedH *Between
In order to actually place the element antenna at these positions,
After adding the condition of
Thin out the antennas where they can be
Array having two frequency bands
Antenna. 3. FH, FL(FH> FLTwo frequencies
Dual frequency band shared array antenna that shares aperture in several bands
, The polarization used in both frequency bands is v2 *
Direction linear polarization, frequency band FHRepresents the possible positions of the element antennas
Vector PH *To PH *= MH(DH1v1 *+ 0.5dH2v2 *) +
nH(DH1v1 *-0.5dH2v2 *) Where mH, NHIs any integer, v1 *, V2 *Is
Unit vectors orthogonal to each other indicating the direction of the sub-antenna array
Le, dH1, DH2Is v1 *, V2 *Element of direction
Frequency band FLRepresents the possible positions of the element antennas
Vector PL *To PL *= ML2k1dH1v1 *+ NLk2dH2v2
*+ 0.5dH2v2 * Where mL, NLIs any integer, k1, K2Each
An integer that satisfies1≧ 1 and k2≧ 1 and
Is PL *= MLk1(DH1v1 *+ 0.5d
H2v2 *) + NLk2(DH1v1 *-1.5dH2
v2 *) + 0.5dH2v2 *  Where mL, NLIs any integer, k1, K2Each
An integer that satisfies1≧ 2 and k2≧ 1 and
Is PL *= MLk1(DH1v1 *+ 1.5d
H2v2 *) + NLk2(DH1v1 *-0.5dH2
v2 *) + 0.5dH2v2 *  Where mL, NLIs any integer, k1, K2Each
An integer that satisfies1≧ 1 and k2≧ 2
And the frequency band FLElement antenna can be arranged
Position PL *And one or more frequency bands in the vicinity
Area FHPosition P at which element antennas can be arrangedH *Between
In order to actually place the element antenna at these positions,
After adding the condition of
Thin out the antennas where they can be
Array having two frequency bands
Antenna. The 4. k 1, k 2, in the frequency band F L, the preceding claims, characterized in that the largest integer among which satisfies the condition which does not generate grating lobes within the desired beam scanning range The dual-frequency band shared array antenna according to claim 3. 5. A frequency band F disposed possible positions of the antenna elements of the L P L *, a frequency band F disposed possible positions of the antenna elements of H P Hi of N near (N is an integer of 1 or more) * (i = 1~N) between these actual conditions added to place the antenna elements in position, both frequency bands of the positions P L * to the frequency band F H and the frequency band F L , oR arranging two frequency sharing antenna elements can be used, or whether to place the antenna elements of the frequency band F L, or whether to place the antenna elements of the frequency band F H, or, if not disposed element antennas is any one, and, in the case of arranging the antenna elements in position P L * 2 frequency sharing element antenna or frequency band F L, the position P Hi * (i = 1~N) the element of frequency bands F H Ante 2 band array antenna of claim 1, wherein it is a condition that excluded from the arrangement possible positions. 6. the frequency band F disposed possible positions of the antenna elements of the L P L *, a frequency band F disposed possible positions of the antenna elements of H P Hi of N near (N is an integer of 1 or more) * (i = 1~N) between these actual conditions added to place the antenna elements in position, both frequency bands of the positions P L * to the frequency band F H and the frequency band F L , oR arranging two frequency sharing antenna elements can be used, or whether to place the antenna elements of the frequency band F H, or is either or not arranged antenna elements, and the position P L * 2 frequency when placing a shared antenna elements, located P Hi * (i = 1~N) is according to claim 1, characterized in that the condition that excluded from placeable position antenna elements of the frequency band F H 2 frequency bands shared Array antenna. 7. the frequency band F disposed possible positions of the antenna elements of the L P L *, a frequency band F disposed possible positions of the antenna elements of H P Hi of N near (N is an integer of 1 or more) * between (i = 1 to N), these actual conditions added to place the antenna elements in position, or the position P L * to place antenna elements frequency band F L, or either placing the antenna elements of the frequency band F H, or is either or not arranged antenna elements, and, in case of arranging the antenna elements of the frequency band F L at the position P L *, the position P Hi * (i = 1~N) 2 according to claim 1, characterized in that the condition that excluded from placeable position antenna elements of the frequency band F H
Array antenna for shared frequency band. 8. Frequency band FLElement antennas can be arranged
Effective position PL *And N neighboring (N is one or more integers)
Frequency band F)HWhere the element antennas can be placed
PHi *(I = 1 to N) at these positions
The condition added to place the element antenna at
PL *Has a frequency band FLPlace element antennas
Or without an element antenna
Yes, and position PL *Frequency band FLElement antenna
Position the position PHi *(I = 1 to N) is
Frequency band FHFrom the positions where element antennas can be placed.
Claim 2 or Claim 3
3. The dual frequency band shared array antenna according to claim 3. 9. A array and the frequency band F _H of the array antenna of the antenna element and the frequency band F _L of the array antenna of the antenna elements are arranged in different planes, respectively, added to actually place the element antennas 4. The two-frequency band shared array according to claim 1, wherein the condition set is a condition that an effect of mutual coupling of the arranged element antennas is within an allowable range. antenna. 10. Both the antenna elements of the array antenna in the frequency band F element _H of the array antenna the antenna and the frequency band F _L is a dipole antenna to the ground plane the same plane, 2 frequency sharing element antenna and the planar 10. The dual frequency band shared array antenna according to claim 9, wherein the antenna is a log-periodic antenna having a ground plane on the same plane. 11. A array antenna in the frequency band F array antenna and the frequency band of the _H F _L are both a planar array of these antenna elements are arranged in the same plane, in order to actually place the element antennas The dual-band shared array antenna according to any one of claims 1 to 3, wherein the condition added to (1) is a condition that the arranged element antennas do not physically interfere with each other. 12. Both the antenna elements of the array antenna in the frequency band F element _H of the array antenna the antenna and the frequency band F _L is a patch antenna, wherein the 2 frequency sharing element antennas are circular patch antenna The dual-band shared array antenna according to claim 11, wherein