JP6861901B2 - Antenna device - Google Patents

Description

The present invention relates to an antenna device.

Conventionally, an antenna device using a so-called "microstrip array antenna" has been developed (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-225935

The central feeding array antenna (C) described in Patent Document 1 is provided with a central feeding portion (5) between the pair of array antennas (A) (see FIG. 3 and the like in Patent Document 1). That is, while the individual array antennas (A) are of the end feeding system, the entire central feeding array antenna (C) is of the central feeding system.

In the central feeding array antenna (C) described in Patent Document 1, since the central feeding portion (5) is provided between the pair of array antennas (A), so-called "blocking" occurs. Due to this blocking, there is a problem that the radiation characteristics are deteriorated. Specifically, for example, there is a problem that the level of so-called "side lobes" increases.

Further, in the centrally fed array antenna (C) described in Patent Document 1, a plurality of crank-shaped transmission lines for phase adjustment are provided in each array antenna (A) (see FIG. 1 and the like in Patent Document 1). ). These crank-shaped transmission lines have a problem of increasing power supply loss.

The present invention has been made to solve the above problems, and an object of the present invention is to suppress the occurrence of blocking and reduce the feeding loss in an antenna device using a microstrip array antenna.

The antenna device of the present invention is electrically connected between a first radiating element group including a plurality of first radiating elements arranged in the first direction and a first radiating element adjacent to each other in the first radiating element group. The first feeding line, the second feeding line electrically connected to any first radiating element except the first radiating element arranged at both ends in the first radiating element group, and the first direction. A second radiation element group including a plurality of second radiation elements arranged in the above, a third feeding line electrically connected between the second radiation elements adjacent to each other in the second radiation element group, and a second radiation. A microstrip array having a fourth feeding line electrically connected to any second radiating element other than the second radiating element arranged at both ends of the element group, and a microstrip array. In the antenna portion, a plurality of first radiating elements and a plurality of second radiating elements are arranged in a one-dimensional array, and the plurality of first radiating elements and the plurality of second radiating elements are arranged with each other. A plurality of first feeding lines and a plurality of third feeding lines are arranged axially symmetrically with each other, and the second feeding line and the fourth feeding line are arranged with each other. They are arranged axially symmetrically .

According to the present invention, since it is configured as described above, in an antenna device using a microstrip array antenna, it is possible to suppress the occurrence of blocking and reduce the power supply loss.

It is a top view which shows the main part of the antenna device which concerns on Embodiment 1. FIG. It is a top view which shows the main part of the antenna device for comparison with respect to the antenna device which concerns on Embodiment 1. FIG. It is a top view which shows the main part of another antenna device for comparison with respect to the antenna device which concerns on Embodiment 1. FIG. It is a top view which shows the main part of the antenna device which concerns on Embodiment 2. FIG. It is explanatory drawing which shows the electromagnetic field simulation result of the radiation pattern by the antenna device which concerns on Embodiment 2. It is a top view which shows the main part of the antenna device which concerns on Embodiment 3. FIG. It is a top view which shows the main part of the antenna device which concerns on Embodiment 4. FIG. It is a top view which shows the main part of another antenna device which concerns on Embodiment 4. FIG. It is a top view which shows the main part of another antenna device which concerns on Embodiment 4. FIG.

Hereinafter, in order to explain the present invention in more detail, a mode for carrying out the present invention will be described with reference to the accompanying drawings.

Embodiment 1.
FIG. 1 is a plan view showing a main part of the antenna device according to the first embodiment. The antenna device 100 of the first embodiment will be described with reference to FIG.

In the figure, 1 is a dielectric substrate. A ground conductor pattern (not shown) is provided on the back surface of the dielectric substrate 1, and a pair of conductor patterns 2 are provided on the front surface of the dielectric substrate 1. _{One conductor pattern 2 1} of the pair of conductor patterns 2 is a portion corresponding to N radiating elements (hereinafter referred to as “first radiating element”) 3 and M feeding lines (hereinafter referred to as “first feeding line”). It has a part corresponding to 4 and a part corresponding to another power feeding line (hereinafter referred to as “second power feeding line”) 5. Other conductor patterns 2 ₂ of the pair of the conductor pattern 2, N number of radiating elements (hereinafter "second radiating element" hereinafter.) Portions corresponding to 6, M number of feed lines (hereinafter "third feed line It has a part corresponding to 7 and a part corresponding to another power supply line (hereinafter referred to as “fourth power supply line”) 8. In this way, the microstrip array antenna portion 9 is configured.

Hereinafter, a group of radiating elements consisting of N first radiating elements 3 will be referred to as a "first radiating element group". Further, a group of radiating elements consisting of N second radiating elements 6 is referred to as a "second radiating element group".

Here, N is an arbitrary integer of 3 or more, and in the example shown in FIG. 1, N = 5. That is, in the example shown in FIG. 1, a microstrip array antenna unit 9 has a first radiating element ₃ 1 to 3 ₅ and five second radiating element _{6 through 65} five. Further, M is an integer of N-1, and in the example shown in FIG. 1, M = 4. That is, in the example shown in FIG. 1, a microstrip array antenna unit 9 has a first feed line _{41 to 4} and four third feed line ₇ 1-7 ₄ 4.

In the microstrip array antenna portion 9, N first radiating elements 3 are arranged in a row, and N second radiating elements 6 are also arranged in a row. More specifically, the arrangement direction of the N first radiating elements 3 and the arrangement direction of the N second radiating elements 6 are the same as each other, and these radiating elements 3 and 6 are linear, that is, primary. They are arranged in the original array. Hereinafter, the arrangement direction of these radiating elements 3 and 6 is referred to as a "first direction". In the example shown in FIG. 1, each first radiating element 3 has a rectangular shape, and each second radiating element 6 also has a rectangular shape.

The X-axis in the figure is a virtual axis along the first direction. In the figure, the Y-axis is a virtual axis that is orthogonal to the first direction and is parallel to the plate surface of the dielectric substrate 1. In the figure, the Z axis is a virtual axis that is orthogonal to the first direction and is along the direction orthogonal to the plate surface of the dielectric substrate 1. That is, the X-axis, Y-axis, and Z-axis are orthogonal to each other.

Hereinafter, a virtual plane that is parallel to the X-axis and the Z-axis and passes through the central portion of each first radiation element 3 and the central portion of each second radiation element 6 is referred to as an “XZ plane”. Further, a virtual plane that is parallel to the Y-axis and the Z-axis and passes through the central portion of the microstrip array antenna portion 9 (that is, passes through the central axis A) is referred to as a “YZ plane”.

Each of the first feeding lines 4 is provided between each of the two first radiating elements 3 adjacent to each other, and is electrically connected to the two first radiating elements 3. In the example shown in FIG. 1, the first feed line _{4 1} is provided, the first feed line _{4 2} between the first radiating element ₃ 2, _{3 3} provided between the first radiating element ₃ 1, _{3 2} is and has first feed line _{4 3} is provided between the first radiating element ₃ 3, _{3 4,} the first feed line _{4 4} is provided between the first radiating element ₃ 4, _{3 5.} Each first power feeding line 4 is composed of a linear line along the first direction.

The individual third feeding lines 7 are provided between each of the two second radiating elements 6 adjacent to each other, and are electrically connected to the two second radiating elements 6. In the example shown in FIG. 1, a third feed line ₇₁ is provided on the second radiating element ₆ 1, ₆ between the _two, a third feed line _{7 2} provided between the second radiating element ₆ 2, _{6 3} is and has third feed line _{7 3} is provided between the second radiating element ₆ 3, _{6 4,} third feeding line _{7 4} is provided between the second radiating element ₆ 4, _{6 5.} Each third power feeding line 7 is composed of a linear line along the first direction.

One end of the second feeding line 5 (hereinafter referred to as "first end") is one or more first radiations excluding the two first radiation elements 3 arranged at both ends in the first radiation element group. It is electrically connected to the first radiating element 3 of any one of the elements 3. In the example shown in FIG. 1, one of the first first radiating element 3 ₁ 2 arranged on both ends in the radiation element _group, 3 of 3 except for the ₅ first radiating element 3 _{two or} three ₄ the first end of the second feed line 5 is electrically connected to the number of first radiating element 3 _2.

The second feeding line 5 is composed of a linear line that is orthogonal to the first direction and is parallel to the plate surface of the dielectric substrate 1. That is, the second feed line 5, extending from the first radiating element 3 of one is a connection target second feed line 5 (the first radiating element 3 ₂ in the example shown in FIG. ₁₎ in the direction along the Y axis Has a shaped shape. In the example shown in FIG. 1, the extension direction of the second feed line 5 to the first radiating element 3 ₂ is -Y direction.

One end of the fourth feeding line 8 (hereinafter referred to as “first end”) is one or more second radiations excluding the two second radiation elements 6 arranged at both ends in the second radiation element group. It is electrically connected to the second radiating element 6 of any one of the elements 6. In the example shown in FIG. 1, one of the second second radiation elements 6 ₁ of two disposed at opposite ends of the radiating element _group, 6 of three except the ₅ second radiating element 6 _{2-6 4} the first end of the fourth feed line 8 is electrically connected to the number of second radiating element 6 _2.

The fourth feeding line 8 is composed of a linear line that is orthogonal to the first direction and is parallel to the plate surface of the dielectric substrate 1. That is, the fourth feed line 8, (in the example shown in FIG. 1 the second radiating element 6 ₂₎ fourth one second radiating element 6 is a target for connection of the feed line 8 extending in the direction along the Y axis from the Has a shaped shape. In the example shown in FIG. 1, the stretching direction of the fourth feed line 8 to the second radiating element 6 ₂ is -Y direction.

The other end of the second feed line 5 (hereinafter referred to as "second end".) It is electrically connected to the feeding portion 10 _1. The feeding unit 10 ₁ supplies high frequency power (more specifically, an electromagnetic wave) to the second end of the second feeding line 5 when the antenna device 100 is used for the transmitting antenna. Power supply to the second end of the second feed line 5 by the feeding unit 10 _1, for example, those using RF (Radio Frequency) connector.

The other end of the fourth feed line 8 (hereinafter referred to as "second end".) It is electrically connected to the feeding portion 10 _2. Feeding portion 10 _2, when the antenna device 100 is used for transmitting antennas (more specifically, an electromagnetic wave) high-frequency power to the second end of the fourth feed line 8 and supplies the. Feeding by the feeding unit 10 ₂ for the second end of the fourth feed line 8, for example, those using a RF connector.

In the example shown in FIG. 1, the conductor pattern 2 ₁ and the conductor pattern 2 ₂ have shapes that are axisymmetric with each other. That, and five of the first radiating element ₃ 1 to 3 ₅ and five second radiating element _{6 through 65} are arranged in axial symmetry to each other and four first feed line ₄ 1 4 ₄ and 4 and the third feeding line 7 _{1-7 4} are arranged axially symmetrically to one another, and a second feed line 5 and the fourth feeding line 8 is disposed axially symmetrically. Sites second feed line 5 of the first radiating element 3 ₂ is connected (hereinafter referred to as "connecting portions".), The end of the first radiating element 3 ₂ in the + X side (the "right end".) Is located in. In contrast, the site where the fourth feeding line 8 in the second radiating element 6 ₂ is connected (hereinafter referred to as "connecting portions".) Is, the -X side end of the second radiating element 6 ₂ (hereinafter " It is located at the left end.) In the figure, A indicates the central axis of the axisymmetry.

In this way, the main part of the antenna device 100 is configured.

Next, the operation of the antenna device 100 will be described. More specifically, when the antenna device 100 is used as a transmitting antenna, an example when the antenna device 100 operates as a traveling wave type antenna will be mainly described.

First, the power feeding unit 10 ₁ supplies electric power to the second end of the second power feeding line 5. The supplied power can propagate in the + Y direction along the second feed line 5 is input to the first radiating element 3 _2. The portion of the power of the input power is radiated into space outside the antenna apparatus 100 by the first radiating element 3 ₂ as an electromagnetic wave. Further, another part of the power of the input power propagates in the + X direction along the first feed line 4 _1, space outside the antenna device 100 as an electromagnetic wave by the first radiating element 3 ₁ Is radiated to. Further, the other part of the power of the input power is propagated in the -X direction along the first feed line 4 _{2-4 4,} the electromagnetic wave by the first radiating element 3 _{3-3 5} It is radiated to the space outside the antenna device 100.

Similarly, supplies power to the feeding portion 10 ₂ and the second end of the fourth feed line 8. The supplied power is fourth propagates in the + Y direction along the feeding line 8, is input to the second radiating element 6 _2. The portion of the power of the input power is radiated as a second electromagnetic wave by radiating element 6 ₂ in the space outside the antenna device 100. Also, the other part of the power that is the input power is propagated in the -X direction along the third feeding line _71, the antenna device 100 outside of the second electromagnetic wave by radiating element 6 ₁ It is radiated into space. Further, another part of the power of the electric power the input is propagated to the third feeding line 7 _2-7 along the ₄ + X direction, as an electromagnetic wave by the second radiating element 6 _{3 through 65} It is radiated to the space outside the antenna device 100.

Here, each of the first radiating element 3 _{two or} three _4, together with those which function to emit electromagnetic waves to space outside the antenna device 100, functions to supply electric power to the first radiating element 3 adjacent It is a thing. In the first radiating element 3 _{two or} three ₄ thereof, passing phase is known to vary depending on the radiation dose. Therefore, set by setting the length of each of the first feed line ₄₁ to ₄ to a suitable value, i.e. the distance between the two first radiating element 3 adjacent to each other to an appropriate value it is therefore possible to excite all of the first radiating element 3 ₁ to 3 ₅ at the same phase with each other.

Similarly, each of the second radiating element 6 _{2-6 4,} together with those which function to emit electromagnetic waves to space outside the antenna device 100, performs a function of supplying electric power to the second radiating element 6 adjacent It is a thing. In the second radiating element 6 _{2-6 4} thereof, passing phase is known to vary depending on the radiation dose. Therefore, set by setting the length of each of the third feed line 7 _{1-7 4} to an appropriate value, i.e. the distance between the two second radiating elements 6 adjacent to each other to an appropriate value it is therefore possible to excite all of the second radiating element 6 _{through 65} in phase with each other.

The field generated in the right end portion of the first radiating element 3 ₂ (i.e. + X side end) direction and the left end portion of the first radiating element 3 ₂ of the electric field generated by (or end of the -X side) It is known that the directions of are opposite to each other. More specifically, it is known that when the direction of one electric field is the + Z direction, the direction of the other electric field is the −Z direction. Likewise, generated by the second right end of the radiating element 6 ₂ (i.e. + end of X side) direction and a second left end of the radiating element 6 ₂ of the electric field generated by (or end of the -X side) It is known that the directions of the electric fields are opposite to each other. More specifically, it is known that when the direction of one electric field is the + Z direction, the direction of the other electric field is the −Z direction.

As described above, in the example shown in FIG. 1, the connecting portion of the second feed line 5 of the first radiating element 3 ₂ is disposed at the right end portion of the first radiating element 3 _2, and the second radiating element 6 connection of the fourth power supply line 8 is disposed at the left end portion of the second radiating element 6 ₂ in _2. Therefore, by setting the opposite phase to the feeding and the feeding by the feeding unit 10 ₁ by the power supply unit 10 _2, i.e., by setting the phase difference between these power supply to 180 °, the first radiating element 3 _{it can} be ₂ to excite by the second radiating element 6 ₂ and the phase with one another.

Next, the effect of the antenna device 100 will be described.

FIG. 2 shows an antenna device 100'for comparison with the antenna device 100 of the first embodiment. As shown in FIG. 2, a ground conductor pattern (not shown) is provided on the back surface of the dielectric substrate 1', and a pair of conductor patterns 2 ₁ ', ₂ 2'are provided on the front surface of the dielectric substrate 1'. Has been done. One conductor pattern _{2 1} ', five of the first radiation element _{3 1'} 'site corresponding to the four first feed line _{4 1'} to 3 ₅ portions corresponding to ~ 4 ₄ ', and a second It has a part corresponding to the power supply line 5'. Other conductor patterns _{2 2} ', five second radiating element _61' 'site corresponding to four third feed line _{7 1' through 65} sites corresponding to _7-4 ', and a fourth It has a part corresponding to the power supply line 8'. The five first radiating element 3 ₁ 'to 3 _5' and the first radiation element group is constituted, five second radiating element ₆₁ 'through _65' of the second radiation element group is constituted by There is. In this way, the microstrip array antenna portion 9'is configured. In the figure, A'indicates the central axis of axisymmetry in the microstrip array antenna portion 9'.

Here, the first end of the second power feeding line 5'is _{electrically connected to the first radiating element 3 1} ', and the second end of the second feeding line 5'is electrically connected to the feeding part 10 ₁ '. Is connected. The first end of the fourth feeding line 8'is _{electrically connected to the second radiating element 6 1} ', and the second end of the fourth feeding line 8'is electrically connected to the feeding section 10 ₂ '. Has been done. Each of the second feeding line 5'and the fourth feeding line 8'is composed of a linear line along the first direction. Thus, the power feeding unit 10 ₁ ', 10 _2' is arranged between 'the second radiating element _{6 1'} first radiating element _{3 1.}

Feeding unit 10 1 _', the second feed line 5' is for supplying radio frequency power (more specifically, an electromagnetic wave) to the second end of the. The supplied electric power propagates in the −X direction along the second feeding line 5 ′ and is input to _{the first radiating element 3 1 ′.} The portion of the power of the input power is radiated out of the space _'antenna device 100 as an electromagnetic wave by the' first radiating element 3 _1. Further, the other part of the input electric power _{propagates in the −X direction along the first feeding line 4 1} ′ to 4 ₄ ′, and the first radiating element 3 ₂ ′ to 3 It is radiated into the space outside the antenna device 100'as an electromagnetic wave by _5'.

Feeding portion 10 2 _', fourth feeding line 8' and supplies the high-frequency power (more specifically, an electromagnetic wave) to the second end of the. The supplied electric power propagates in the + X direction along the fourth feeding line 8'and is input to _{the second radiating element 6 1'.} The portion of the power of the input power is radiated out of the space _'antenna device 100 as an electromagnetic wave by' second radiating element _61. Also, the other part of the power of the input power, the third feed line 7 ₁ 'to 7 _4' propagates as the + X direction along the second radiating element 6 _{2 'through 65} It is radiated into the space outside the antenna device 100'as an electromagnetic wave.

That is, the first radiating element group in the antenna device 100'is the end feeding system, and the second radiating element group in the antenna device 100'is also the end feeding system. On the other hand, the entire microstrip array antenna portion 9'is a central feeding system.

Here, the actual feed portion 10 ₁ ', 10 _2' is a structure having a physical size. Therefore, especially in a high frequency band, the distance between the center of the central portion and the second radiating element _{61 ''} of the first radiating element 3 _{1 'in} the antenna device 100 D2 (see FIG. 2), the antenna device 100 It becomes larger than the distance between the first radiating element 3 _first center and the second center portion of the radiating element 6 ₁ D1 (see FIG. 1) in the. The antenna device 100'has a problem that the radiation characteristics are deteriorated because blocking occurs due to the large interval D2. Specifically, for example, there is a problem that the side lobe level becomes large.

On the other hand, in the antenna device 100 of the first embodiment, the second feeding line 5 is connected to one first radiation element 3 arranged inside in the first radiation element group, and the one in the example shown in the feeding direction is non-parallel to the first direction (FIG. 1 for the first radiating element 3, the feeding direction with respect to the first radiating element 3 ₂ is the + Y direction, the feeding direction is a first direction It is orthogonal to.). Further, the fourth feeding line 8 is connected to one second radiating element 6 arranged inside in the second radiating element group, and the feeding direction with respect to the one second radiating element 6 is in the first direction. it is not parallel for (in the example shown in FIG. 1, the feeding direction with respect to the second radiating element 6 ₂ is the + Y direction, the feeding direction is orthogonal to the first direction.). Hereinafter, such a power supply method is referred to as a "side power supply method".

By employing the lateral feeding system, as shown in FIG. 1, it is possible to prevent the power supply unit 10 _1, 10 ₂ is disposed in the first radiating element 3 ₁ and the second between radiating element _61. As a result, the interval D1 can be made smaller than the interval D2, so that the occurrence of blocking can be suppressed. As a result, the radiation characteristics can be improved as compared with the antenna device 100'. Specifically, for example, the sidelobe level can be reduced.

FIG. 3 shows another antenna device 100 "for comparison with the antenna device 100 of the first embodiment. As shown in FIG. 3, a ground conductor pattern (not shown) is provided on the back surface of the dielectric substrate 1". _{A pair of conductor patterns 2 1} ", 2 ₂ " are provided on the surface of the dielectric substrate 1 ". One conductor pattern 2 ₁ " has five first radiation elements 3 ₁ ". "portions corresponding to the four first feed line ₄ 1" to 3 ₅ has the "portion corresponding to, and a second feed line 5" to 4 ₄ portions corresponding to the. other conductor pattern 2 _{2 "is a part corresponding to 5} second radiation elements 6 ₁ " to 6 5 ", a part corresponding to 4 third power supply lines 7 ₁ " to 7 ₄ ", and a 4th power supply line 8". the .5 pieces first radiating element ₃ 1 "to 3 _5" that has a corresponding site is constituted the first radiation element group, five second radiating element ₆₁ by "6 ₅ ' The second radiation element group is configured. In this way, the microstrip array antenna portion 9 ”is configured. In the figure, A "indicates the central axis of axisymmetry in the microstrip array antenna portion 9".

The first end of the second feeding line 5 " _{is electrically connected to the first radiating element 3 1} ", and the second end of the second feeding line 5 "is electrically connected to the _{feeding part 10 1".} Has been done. The power feeding unit 10 ₁ "supplyes high frequency power (more specifically, an electromagnetic wave) to the second end of the second power feeding line 5". The supplied power is "propagating along the first radiating element 3 _1" second feed line 5 is input to. The portion of the power of the input power is radiated out of the space _"antenna device 100 as an electromagnetic wave by the" first radiating element 3 _1. In addition, the other part of the input electric power _{propagates in the −X direction along the first feeding line 4 1} “to 4 ₄ ”, and the first radiating element 3 ₂ “to 3”. It is radiated into the space outside the antenna device 100 "as an electromagnetic wave by _5".

The first end of the fourth feeding line 8 " _{is electrically connected to the second radiating element 6 1} ", and the second end of the fourth feeding line 8 "is electrically connected to the _{feeding section 10 2".} Has been done. The power feeding unit 10 ₂ "supplyes high frequency power (more specifically, an electromagnetic wave) to the second end of the fourth power feeding line 8". The supplied power is "propagating along the second radiating element 6 _1" fourth feeding line 8 is input to. The portion of the power of the input power is radiated out of the space _"antenna device 100 as an electromagnetic wave by" second radiating element _61. Also, the other part of the power of the input power, the third feed line 7 _{1 "to} 7 _4" propagates as the + X direction along the second radiating element 6 _{2 "6 5} As an electromagnetic wave, it is radiated into the space outside the antenna device 100.

Here, in the antenna device 100 ", each of the second feeding line 5" and the fourth feeding line 8 "is composed of substantially crank-shaped lines, that is, the second feeding line 5" and the fourth feeding line. Each of the 8 "has a plurality of bent portions, whereby the feeding portions 10 ₁ " and 10 ₂ "are arranged between the first radiating element 3 ₁ " and the second radiating element 6 _{1 ".} The distance D3 (see FIG. 3) between the center of the first radiating element 3 ₁ "and the center of the second radiating element 6 ₁ " is compared with the distance D2 (see FIG. 2). It can be made smaller. As a result, the occurrence of blocking can be suppressed.

However, it is generally known that when a microstrip line is provided with a discontinuity (bent portion, branch portion, etc.), unnecessary electromagnetic wave radiation is generated by the discontinuity portion, and the power supply loss increases. ing. The antenna device 100 "has a problem that the feeding loss increases due to a plurality of bent portions provided on each of the second feeding line 5" and the fourth feeding line 8 ".

On the other hand, the antenna device 100 of the first embodiment adopts the side feeding method as described above. Thus, by using the second power supply line 5 straight, the feeding portion 10 ₁ can be prevented from being disposed in the first radiating element 3 ₁ and the second between radiating element _61. Further, it is possible to use a fourth feed line 8 straight, to prevent the power supply unit 10 ₂ is disposed in the first radiating element 3 ₁ and the second between radiating element _61. As a result, it is possible to reduce the power supply loss as compared with the antenna device 100 "while suppressing the occurrence of blocking.

The antenna device 100 may operate as a standing wave type antenna.

Further, the antenna device 100 may be the one used for the receiving antenna.

Furthermore, (in the example shown in FIG. 1 3 ₂ first radiating _element) one first radiating element 3 which is a target for connection of the second feed line 5 first connecting portion of the second feed line 5 in which one said of is disposed at the right end portion of the first radiating element 3, and, (in the example shown in FIG. 1 the second radiating element 6 ₂₎ fourth one second radiating element 6 is a target for connection of the feed line 8 first in 4 The connecting portion of the feeding line 8 may be arranged at the right end portion of the one second radiating element 6. Alternatively, the connection portion of the second feeding line 5 in the one first radiating element 3 is arranged at the left end portion in the one first radiating element 3, and the one second radiating element 6 is arranged. The connection portion of the fourth feeding line 8 in the above may be arranged at the left end portion of the one second radiating element 6. In this case, by setting the phase with each other and a power supply and the power supply by the power supply unit 10 ₁ by the power supply unit 10 _2, i.e., by setting the phase difference between these power supply to 0 °, the first one the of The radiating element 3 and the one second radiating element 6 can be excited with each other in the same phase.

Further, the antenna device 100 may have a ground conductor plate instead of the ground conductor pattern, and may have a pair of conductor plates instead of the pair of conductor patterns 2. One of the conductive plates of the pair of conductor plates are those having the same shape as the conductor pattern 2 _1, other conductor plate of the pair of conductor plates are those having the same shape as the conductor pattern 2 ₂ is there. In this case, a spacer may be provided between the grounding conductor plate and the pair of conductor plates instead of the dielectric substrate 1.

Further, the shape of each first radiating element 3 is not limited to a rectangular shape. The individual first radiating elements 3 may have, for example, an elliptical shape or a polygonal shape. Similarly, the shape of each second radiating element 6 is not limited to a rectangular shape. The individual second radiating element 6 may have, for example, an elliptical shape or a polygonal shape.

Further, the antenna device 100 is circularly polarized because the individual first radiating elements 3 are provided with a pair of notches and the individual second radiating elements 6 are provided with a pair of notches. It may operate as an antenna. Alternatively, the antenna device 100 may operate as a circularly polarized antenna because the polarizer is arranged so as to face the surface portion of the dielectric substrate 1.

Further, the phase of excitation in the N first radiating elements 3 (that is, the phase of feeding to the N first radiating elements 3) can be individually set, and the excitation phase in the N second radiating elements 6 can be set individually. The phase (that is, the phase of feeding to the N second radiating elements 6) may be individually adjustable. As a result, the antenna device 100 may operate as a so-called "phased array antenna".

As described above, the antenna device 100 of the first embodiment includes a first radiating element group including a plurality of first radiating elements 3 arranged in the first direction, and a first radiating element group adjacent to each other in the first radiating element group. Electrically to the first feeding line 4 electrically connected between the radiating elements 3 and any first radiating element 3 except the first radiating element 3 arranged at both ends of the first radiating element group. A microstrip array antenna portion 9 having a second feeding line 5 connected to the above is provided. Thereby, the side power supply system can be realized. Therefore, when the microstrip array antenna unit 9 has another radiating element group similar to the first radiating element group (that is, the second radiating element group), it is between the first radiating element group and the second radiating element group. It is possible to avoid arranging the power feeding units 10 ₁ and 10 _2. As a result, the occurrence of blocking can be suppressed. Further, at this time, the discontinuity in the feeding line between the first radiating elements 3 adjacent to each other (that is, the first feeding line 4) can be eliminated, and the feeding between the second radiating elements 6 adjacent to each other can be eliminated. Not only the discontinuity in the line (that is, the third feeding line 7) can be eliminated, but also the discontinuity in the feeding line (that is, the second feeding line 5) between the feeding _{section 10 1 and the first radiating element 3} the continuous portion can be eliminated, and a discontinuous portion and the feeding portion 10 ₂ in the feed line between the second radiating element 6 (i.e. the fourth feeding line 8) can be eliminated. As a result, the power supply loss can be reduced. Further, at this time, the operating gain of the antenna device 100 can be increased by improving the radiation characteristics and reducing the feeding loss. As a result, electromagnetic waves can be efficiently radiated in the so-called "broadside direction".

Further, the microstrip array antenna unit 9 is located between a second radiating element group including a plurality of second radiating elements 6 arranged in the first direction and a second radiating element 6 adjacent to each other in the second radiating element group. The third power feeding line 7 electrically connected and the second radiating element 6 electrically connected to any of the second radiating elements 6 except the second radiating element 6 arranged at both ends in the second radiating element group. A plurality of first radiating elements 3 and a plurality of second radiating elements 6 are arranged in a one-dimensional array shape in the microstrip array antenna portion 9 having 4 feeding lines 8. As a result, as shown in FIG. 1, a so-called "linear array antenna" can be realized.

Further, in the microstrip array antenna portion 9, the plurality of first radiation elements 3 and the plurality of second radiation elements 6 are arranged axially symmetrically with each other, and the plurality of first feeding lines 4 and the plurality of first feeding lines 4 are arranged. The third feeding lines 7 are arranged axially symmetrically with each other, and the second feeding line 5 and the fourth feeding line 8 are arranged axially symmetrically with each other. Thereby, the shape of the radiation pattern by the antenna device 100 can be made substantially axisymmetric. In particular, the shape of the radiation pattern in the XZ plane can be made substantially axisymmetric.

Further, each first power feeding line 4 is composed of a linear line along the first direction, and each third power feeding line 7 is composed of a straight line along the first direction. Since these feeding lines are linear, it is possible to avoid the generation of unnecessary electromagnetic waves due to the discontinuity.

Further, the second feeding line 5 is composed of a linear line along the direction orthogonal to the first direction, and the fourth feeding line 8 is composed of a straight line along the direction orthogonal to the first direction. There is. Since these feeding lines are linear, it is possible to avoid the generation of unnecessary electromagnetic waves due to the discontinuity.

The meaning of the term "axisymmetric" described in the claims of the present application is not limited to a completely axisymmetric mode, but includes a substantially axisymmetric mode. Further, the meaning of the term "straight line" described in the claims of the present application is not limited to a completely linear mode, but includes a substantially linear mode. Further, the meaning of the term "orthogonal direction" described in the claims of the present application is not limited to a completely orthogonal direction, but includes a substantially orthogonal direction.

Embodiment 2.
FIG. 4 is a plan view showing a main part of the antenna device according to the second embodiment. The antenna device 100a of the second embodiment will be described with reference to FIG. In FIG. 4, the same components as those shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 4, the first radiating element 3 _1, has a recess 21 ₁ pair of notch-like arranged on both sides with respect to the first feed line 4 ₁ in the first feed line 4 _first connecting portion There is. First radiating element 3 ₂ has a recess 21 ₂ a pair of notch-like arranged on both sides with respect to the first feed line 4 ₁ in the first feed line 4 _first connection portion. First radiating element 3 ₂ includes a first feed line 4 ₂ of the first feed line 4 _second recess 21 ₃ pair of notch-like arranged on both sides with respect to the connecting portion. First radiating element 3 ₃ includes a first feed line 4 ₂ of the first feed line 4 ₂ pair of notch-like recesses 21 ₄ arranged on opposite sides with respect to the connecting portion. First radiating element 3 ₃ has a recess 21 ₅ pair of notch-like arranged on both sides with respect to the first feed line 4 ₃ at the connecting portion of the first feed line 4 _3. First radiating element 3 ₄ has a first feed line 4 first feed line 4 ₃ recesses 21 ₆ pair of notch-like arranged on both sides for the connection of _3. First radiating element 3 ₄ has a first feed line 4 ₄ of the first feed line 4 a pair of notch-like recesses 21 ₇ disposed on opposite sides with respect to ₄ at a connection. First radiating element ₃₅ has a first feed line 4 ₄ of the first feed line 4 a pair of notch-like recesses 21 ₈ arranged on opposite sides with respect to ₄ at a connection.

Similarly, the second radiating element ₆₁ has a third feed line ₇₁ of the recess 22 ₁ a pair of notch-like arranged on opposite sides with respect to the third feed line ₇₁ at the connection portion. The second radiating element 6 ₂ comprises a third feed line ₇₁ of the pair of notch-like recesses 22 ₂ disposed on opposite sides with respect to the third feed line ₇₁ at the connection portion. The second radiating element 6 ₂ comprises a third feed line 7 at the _second connection portion third feeding line 7 ₂ recesses 22 ₃ pair of notch-like arranged on both sides against. The second radiating element 6 ₃ has a third feed line 7 ₂ of the third feeding line 7 ₂ pair of notch-like recesses 22 ₄ arranged on opposite sides with respect to the connecting portion. The second radiating element 6 ₃ has a third feed line 7 third feed line 7 recesses 22 ₅ of the pair of notched arranged on opposite sides with respect to ₃ at a connection of the _3. The second radiating element 6 ₄ has a third feed line 7 third feed line 7 recesses 22 ₆ of the pair of notched arranged on opposite sides with respect to ₃ at a connection of the _3. The second radiating element 6 ₄ has a third feed line 7 ₄ third feed line 7 pair of notch-like recesses 22 ₇ disposed on opposite sides with respect to ₄ at a connection. The second radiating element 6 _5, and a third feed line 7 ₄ third feed line 7 pair of notch-like recesses 22 ₈ arranged on opposite sides with respect to ₄ at a connection.

That is, a notch-shaped recess 21 is formed at the connection portion of the first power feeding line 4 in each first radiation element 3. Further, a notch-shaped recess 22 is formed in the connection portion of the third feeding line 7 in each second radiating element 6.

In this way, the microstrip array antenna portion 9a is configured.

Next, the operation of the antenna device 100a will be described. More specifically, when the antenna device 100a is used as a transmitting antenna, an example when the antenna device 100a operates as a traveling wave type antenna will be mainly described.

First, the power feeding unit 10 ₁ supplies electric power to the second end of the second power feeding line 5. The supplied power can propagate in the + Y direction along the second feed line 5 is input to the first radiating element 3 _2. The portion of the power of the input power is radiated into space outside the antenna device 100a by the first radiating element 3 ₂ as an electromagnetic wave. Also, the other part of the power of the input power propagates in the + X direction along the first feed line 4 _1, space outside the antenna device 100a as a first electromagnetic wave by radiating element 3 ₁ Is radiated to. Further, the other part of the power of the input power is propagated in the -X direction along the first feed line 4 _{2-4 4,} the electromagnetic wave by the first radiating element 3 _{3-3 5} Is radiated into the space outside the antenna device 100a.

Similarly, supplies power to the feeding portion 10 ₂ and the second end of the fourth feed line 8. The supplied power is fourth propagates in the + Y direction along the feeding line 8, is input to the second radiating element 6 _2. The portion of the power of the input power is radiated into space outside the antenna device 100a as the second electromagnetic wave by radiating element 6 _2. Also, the other part of the power that is the input power is propagated in the -X direction along the third feeding line _71, outside the antenna device 100a as the second electromagnetic wave by radiating element 6 ₁ It is radiated into space. Further, another part of the power of the electric power the input is propagated to the third feeding line 7 _2-7 along the ₄ + X direction, as an electromagnetic wave by the second radiating element 6 _{3 through 65} It is radiated to the space outside the antenna device 100a.

Here, assuming the case where the concave portion 21 to each of the first radiation element 3 is not formed, a portion of the power to be radiated to the space outside the antenna device 100a as a first electromagnetic wave by radiating element 3 ₁ is first radiation without being radiated to the space outside the antenna device 100a as an electromagnetic wave by the element 3 _1, it may be reflected by the first radiating element 3 _1. Some of the power of the reflected power, the first feed line 4 _1, and the first radiating element 3 ₂ and a second feed line 5 is sequentially passed, return to the feeding section 10 ₁ (i.e., so-called ""Reflectedwave" is generated.). Further, another part of the power of the reflected power, the first feed line 4 _1, the first radiating element 3 ₂ and the first feed line 4 ₂ sequentially passes through the first radiating element 3 ₃ to 3 ₅ is radiated into space outside the antenna device 100a as an electromagnetic wave by (i.e., so-called "unnecessary radiation wave" occurs.).

Further, if the case where the concave portion 21 to each of the first radiation element 3 is not formed, a portion of the power to be radiated to the space outside the antenna device 100a as the electromagnetic wave by the first radiating element 3 _{3-3 5,} the without being radiated to the space outside the antenna device 100a as the electromagnetic wave by the first radiating element ₃ 3-3 _5, may be reflected by the first radiating element ₃ 3-3 _5. Some of the power of the reflected power, the first power supply line 4 _2, and the first radiating element 3 ₂ and a second feed line 5 is sequentially passed, return to the feeding section 10 ₁ (i.e., the reflected wave Occurs.). Further, the other part of the reflected power _{passes through the first feeding line 42 2} , the first radiating element 3 ₂ and the first feeding line 4 ₁ in order, and the first radiating element 3 ₁ As an electromagnetic wave, it is radiated into the space outside the antenna device 100a (that is, an unnecessary radiated wave is generated).

On the other hand, since the recess 21 is formed in each of the first radiating elements 3, it is possible to suppress the generation of reflected waves and unnecessary radiating waves in the first radiating element group. As a result, the power supply loss can be further reduced and the radiation characteristics can be further improved.

Similarly, if the case where the concave portion 22 to the respective second radiating element 6 is not formed, a portion of the power to be radiated to the space outside the antenna device 100a as the second electromagnetic wave by radiating element ₆₁ is a second radiation without being radiated to the space outside the antenna device 100a as an electromagnetic wave by an element 6 _1, which may be reflected by the second radiating element _61. Some of the power of the reflected power, the third feed line _71, and a second radiating element 6 _second and fourth feed lines 8 sequentially passes through, back to the feeding portion 10 ₂ (i.e., the reflected wave Occurs.). Further, the other part of the reflected power _{passes through the third feeding line 71 1} , the second radiating element 6 ₂ and the third feeding line 7 ₂ in order, and the second radiating element 63 ₃ 6 ₅ is radiated to the space outside the antenna device 100a as an electromagnetic wave by (i.e., unnecessary radiation wave is generated.).

Further, if the case where the concave portion 22 to the respective second radiating element 6 is not formed, a portion of the power to be radiated to the space outside the antenna device 100a as the electromagnetic wave by the second radiating element 6 _{3-6 5,} the the second radiation element ₆ 3 _{through 65} without being emitted to the space outside the antenna device 100a as an electromagnetic wave, may be reflected by the second radiating element ₆ 3 _{through 65.} Some of the power of the reflected power, the third feed line 7 _2, and the second radiating element 6 _second and fourth feed lines 8 sequentially passes through, back to the feeding portion 10 ₂ (i.e., the reflected wave Occurs.). Further, another part of the power of the reflected power, the third feed line 7 _2, the second radiation element 6, _second and third successively passes through the feed line _71, the second radiating element 6 ₁ As an electromagnetic wave, it is radiated into the space outside the antenna device 100a (that is, an unnecessary radiated wave is generated).

On the other hand, since the recess 22 is formed in each of the second radiating elements 6, it is possible to suppress the generation of reflected waves and unnecessary radiating waves in the second radiating element group. As a result, the power supply loss can be further reduced and the radiation characteristics can be further improved.

Next, the effect of the antenna device 100a will be described.

FIG. 5 shows the electromagnetic field simulation result of the radiation pattern by the antenna device 100a. In the figure, I corresponds to the main polarization in the XZ plane, and II in the figure corresponds to the main polarization in the YZ plane. Further, θ = 0 ° in FIG. 5 corresponds to the + Z direction in FIG. As shown in FIG. 5, the radiation pattern by the antenna device 100a has directivity in the broadside direction and has a small sidelobe level. By using the side-fed antenna device 100a, such a good radiation pattern can be obtained.

As the antenna device 100a, various modifications similar to those described in the first embodiment, that is, various modifications similar to the antenna device 100 can be adopted.

As described above, in the antenna device 100a of the second embodiment, the notch-shaped recess 21 is formed in the connection portion of the first feeding line 4 in the individual first radiating element 3, and the individual second radiating element 3 is formed. A notch-shaped recess 22 is formed at the connection portion of the third power feeding line 7 in No. 6. As a result, it is possible to suppress the generation of reflected waves and unnecessary radiated waves in each radiating element group. As a result, the power supply loss can be further reduced and the radiation characteristics can be further improved.

Embodiment 3.
FIG. 6 is a plan view showing a main part of the antenna device according to the third embodiment. The antenna device 100b of the third embodiment will be described with reference to FIG. In FIG. 6, the same components as those shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 6, a waveguide 31 is provided on the back surface of the dielectric substrate 1. In the example shown in FIG. 6, the waveguide 31 is composed of a rectangular waveguide. The waveguide 31 is provided so that its axis is orthogonal to the plate surface of the dielectric substrate 1.

A rectangular through hole (hereinafter referred to as “coupling hole”) 32 is formed at a position corresponding to the central portion of the waveguide 31 in the ground conductor pattern. Further, a rectangular conductor pattern 33 is provided at a position corresponding to the central portion of the waveguide 31 on the surface portion of the dielectric substrate 1. The feeding portion 10b is composed of the waveguide 31, the coupling hole 32, and the conductor pattern 33.

The conductor pattern 2 ₁ has a portion corresponding to a feeding line (hereinafter referred to as “fifth feeding line”) 34 provided between the feeding portion 10b and the second end portion of the second feeding line 5. .. That is, one end of the fifth feeding line 34 (hereinafter referred to as "first end") is electrically connected to the second end of the second feeding line 5, and the other end of the fifth feeding line 34. (Hereinafter referred to as “second end”) is electrically connected to the waveguide 31 via the conductor pattern 33 and the coupling hole 32. The fifth power feeding line 34 is composed of a linear line along the first direction.

The conductor pattern 2 ₂ has a portion corresponding to a feeding line (hereinafter referred to as “sixth feeding line”) 35 provided between the feeding portion 10b and the second end portion of the fourth feeding line 8. .. That is, one end of the sixth feeding line 35 (hereinafter referred to as "first end") is electrically connected to the second end of the fourth feeding line 8, and the other end of the sixth feeding line 35. (Hereinafter referred to as “second end”) is electrically connected to the waveguide 31 via the conductor pattern 33 and the coupling hole 32. The sixth feeding line 35 is composed of a straight line along the first direction.

In this way, the microstrip array antenna portion 9b is configured.

In the example shown in FIG. 6, the power feeding unit 10b is arranged on the central axis A. As a result, in the microstrip array antenna portion 9b, the fifth feeding line 34 and the sixth feeding line 35 are arranged axially symmetrically with each other. That is, the conductor pattern 2 ₁ and the conductor pattern 2 ₂ have shapes that are axisymmetric to each other.

The conductor pattern 33 is provided for impedance matching between the waveguide 31 and the coupling hole 32 and the fifth feeding line 34 and the sixth feeding line 35. The coupling between the waveguide 31 and the fifth feed line 34 and the sixth feed line 35 according to the dimensions of the coupling hole 32 (more specifically, the dimension along the X-axis and the dimension along the Y-axis). The amount can be adjusted. Further, depending on the dimensions of the conductor pattern 33 (more specifically, the dimension with respect to the direction along the X axis and the dimension with respect to the direction along the Y axis), between the waveguide 31 and the fifth feeding line 34 and the sixth feeding line 35. The amount of binding can be adjusted.

Next, the operation of the antenna device 100b will be described. More specifically, when the antenna device 100b is used as a transmitting antenna, an example when the antenna device 100b operates as a traveling wave type antenna will be mainly described.

First, the power feeding unit 10b supplies high frequency power (more specifically, electromagnetic waves) to the second end of the fifth power feeding line 34. The supplied power is propagated along the fifth feed line 34 and a second feed line 5 is input to the first radiating element 3 _2. Since the behavior of the input power is the same as that described in the first embodiment, the description will be omitted again.

Further, the power feeding unit 10b supplies high frequency power (more specifically, an electromagnetic wave) to the second end of the sixth power feeding line 35. The supplied power is propagated along the sixth feed line 35 and the fourth feeding line 8, is input to the second radiating element 6 _2. Since the behavior of the input power is the same as that described in the first embodiment, the description will be omitted again.

As the antenna device 100b, various modifications similar to those described in the first embodiment, that is, various modifications similar to the antenna device 100 can be adopted.

Further, the individual first radiating element 3 in the antenna device 100b may have a recess 21 similar to the individual first radiating element 3 in the antenna device 100a. The individual second radiating element 6 in the antenna device 100b may have a recess 22 similar to the individual second radiating element 6 in the antenna device 100a.

Further, the shape of the coupling hole 32 is not limited to a rectangular shape. The coupling hole 32 may have, for example, an elliptical shape or a polygonal shape.

Further, when a gap is formed between the back surface portion of the dielectric substrate 1 and the waveguide 31, a leakage current is generated. In this case, the waveguide 31 may have a so-called "choke structure". As a result, the leaked current can be cut off.

As described above, the antenna device 100b of the third embodiment includes the feeding section 10b using the waveguide 31, and the microstrip array antenna section 9b electrically connects the second feeding line 5 and the feeding section 10b. It has a fifth power supply line 34 connected, and a sixth power supply line 35 electrically connected between the fourth power supply line 8 and the power supply unit 10b. As a result, the side feeding method can be realized as in the antenna device 100 of the first embodiment. As a result, the occurrence of blocking can be suppressed and the power supply loss can be reduced.

Further, the fifth power feeding line 34 is composed of a linear line along the first direction, and the sixth feeding line 35 is composed of a straight line along the first direction. Since these feeding lines are linear, the number of bent portions in the feeding line between the feeding section 10b and the first radiating element 3 (that is, the second feeding line 5 and the fifth feeding line 34) is reduced to one. In addition, the number of bent portions in the feeding line between the feeding section 10b and the second radiating element 6 (that is, the fourth feeding line 8 and the sixth feeding line 35) can be reduced to one. As a result, it is possible to suppress the generation of unnecessary electromagnetic wave radiation due to the discontinuous portion as compared with the antenna device 100 ”.

Embodiment 4.
FIG. 7 is a plan view showing a main part of the antenna device according to the fourth embodiment. FIG. 8 is a plan view showing a main part of another antenna device according to the fourth embodiment. FIG. 9 is a plan view showing a main part of another antenna device according to the fourth embodiment. The antenna devices 100c, 100d, 100e of the fourth embodiment will be described with reference to FIGS. 7 to 9.

As shown in FIG. 7, the antenna device 100c of the fourth embodiment has a plurality of microstrip array antenna portions 9 arranged in a direction different from the first direction (hereinafter referred to as “second direction”). .. The individual microstrip array antenna portions 9 are the same as those described in the first embodiment. In the plurality of microstrip array antenna units 9, the plurality of first radiation elements 3 and the plurality of second radiation elements 6 are arranged in a plane, that is, in a two-dimensional array. In the example shown in FIG. 7, the second direction is set in the direction along the Y axis, that is, in the direction orthogonal to the first direction. In FIG. 7, the reference numerals of the respective parts in the individual conductor patterns 2 are not shown.

Alternatively, as shown in FIG. 8, the antenna device 100d of the fourth embodiment has a plurality of microstrip array antenna portions 9a arranged in the second direction. The individual microstrip array antenna portions 9a are the same as those described in the second embodiment. In the plurality of microstrip array antenna portions 9a, the plurality of first radiation elements 3 and the plurality of second radiation elements 6 are arranged in a plane, that is, in a two-dimensional array. In the example shown in FIG. 8, the second direction is set in the direction along the Y axis, that is, in the direction orthogonal to the first direction. In FIG. 8, the symbols of the respective parts, the symbols of the individual recesses 21, and the symbols of the individual recesses 22 in the individual conductor patterns 2 are not shown.

Alternatively, as shown in FIG. 9, the antenna device 100e of the fourth embodiment has a plurality of microstrip array antenna portions 9b arranged in the second direction. The individual microstrip array antenna portions 9b are the same as those described in the third embodiment. In the plurality of microstrip array antenna portions 9b, a plurality of first radiation elements 3 and a plurality of second radiation elements 6 are arranged in a plane, that is, in a two-dimensional array. In the example shown in FIG. 9, the second direction is set in the direction along the Y axis, that is, in the direction orthogonal to the first direction. In FIG. 9, the reference numerals of the respective parts in the individual conductor patterns 2 and the reference numerals of the respective parts in the individual power feeding portions 10b are not shown.

The second direction is not limited to the direction orthogonal to the first direction. The second direction may be an oblique direction with respect to the first direction.

Further, as the individual microstrip array antenna unit 9 in the antenna device 100c, various modifications similar to those described in the first embodiment can be adopted.

Further, as the individual microstrip array antenna portion 9a in the antenna device 100d, various modifications similar to those described in the second embodiment can be adopted.

Further, as the individual microstrip array antenna portion 9b in the antenna device 100e, various modifications similar to those described in the third embodiment can be adopted. For example, in the antenna device 100e, the individual first radiating element 3 may have a recess 21, or the individual second radiating element 6 may have a recess 22.

Further, as the individual power feeding unit 10b in the antenna device 100e, various modifications similar to those described in the third embodiment can be adopted.

As described above, the antenna device 100c of the fourth embodiment includes a plurality of microstrip array antenna units 9 arranged in a second direction different from the first direction, and the plurality of microstrip array antenna units 9 include the plurality of microstrip array antenna units 9. A plurality of first radiating elements 3 and a plurality of second radiating elements 6 are arranged in a two-dimensional array. As a result, as shown in FIG. 7, a so-called "planar array antenna" can be realized.

Further, the antenna device 100d of the fourth embodiment includes a plurality of microstrip array antenna portions 9a arranged in a second direction different from the first direction, and a plurality of microstrip array antenna portions 9a are provided. The first radiating element 3 and the plurality of second radiating elements 6 are arranged in a two-dimensional array. As a result, as shown in FIG. 8, a planar array antenna can be realized.

Further, the antenna device 100e of the fourth embodiment includes a plurality of microstrip array antenna portions 9b arranged in a second direction different from the first direction, and a plurality of microstrip array antenna portions 9b are provided. The first radiating element 3 and the plurality of second radiating elements 6 are arranged in a two-dimensional array. As a result, as shown in FIG. 9, a planar array antenna can be realized.

In the present invention, within the scope of the invention, it is possible to freely combine each embodiment, modify any component of each embodiment, or omit any component in each embodiment. ..

The antenna device of the present invention can be used, for example, in a radar device.

1 Dielectric substrate, 2 Conductor pattern, 3 Radiating element (1st radiating element), 4 Feeding line (1st feeding line), 5 Feeding line (2nd feeding line), 6 Radiating element (2nd radiating element), 7 Feeding line (3rd feeding line), 8 feeding line (4th feeding line), 9,9a, 9b microstrip array antenna part, 10,10b feeding part, 21 recesses, 22 recesses, 31 waveguides, 32 coupling holes , 33 Conductor pattern, 34 feed line (fifth feed line), 35 feed line (sixth feed line), 100, 100a, 100b, 100c, 100d, 100e antenna device.

Claims (7)

A group of first radiating elements including a plurality of first radiating elements arranged in the first direction,
A first feeding line electrically connected between the first radiating elements adjacent to each other in the first radiating element group, and a first feeding line.
A second feeding line electrically connected to any one of the first radiating elements except the first radiating element arranged at both ends of the first radiating element group.
A group of second radiating elements including a plurality of second radiating elements arranged in the first direction, and a group of second radiating elements.
A third feeding line electrically connected between the second radiating elements adjacent to each other in the second radiating element group, and a third feeding line.
A microstrip array antenna portion having a fourth feeding line electrically connected to any of the second radiating elements excluding the second radiating element arranged at both ends of the second radiating element group. With
In the microstrip array antenna portion
A plurality of the first radiating elements and a plurality of the second radiating elements are arranged in a one-dimensional array, and the plurality of the first radiating elements and the plurality of the second radiating elements are arranged with each other. The first feeding line and the third feeding line are arranged axisymmetrically with each other, and the second feeding line and the fourth feeding line are arranged symmetrically with each other. An antenna device characterized in that the tracks are arranged axisymmetrically with each other. Equipped with a feeding section using a waveguide,
The microstrip array antenna unit includes a fifth power supply line electrically connected between the second power supply line and the power supply unit, and a sixth power supply line electrically connected between the fourth power supply line and the power supply unit. The antenna device according to claim 1, further comprising a feeding line. Each of the first feeding lines is composed of a linear line along the first direction.
The antenna device according to claim 2, wherein each of the third feeding lines is composed of a linear line along the first direction. The second feeding line is composed of a linear line along a direction orthogonal to the first direction.
The antenna device according to claim 1, wherein the fourth feeding line is composed of a linear line along a direction orthogonal to the first direction. The fifth feeding line is composed of a linear line along the first direction.
The antenna device according to claim 2, wherein the sixth feeding line is composed of a linear line along the first direction. A notch-shaped recess is formed in the connection portion of the first feeding line in each of the first radiating elements.
The antenna device according to claim 1, wherein a notch-shaped recess is formed in a connection portion of the third feeding line in each of the second radiating elements. A plurality of the microstrip array antenna portions arranged in a second direction different from the first direction are provided.
Claims 1 to 6 are characterized in that, in the plurality of microstrip array antenna portions, a plurality of the first radiating elements and a plurality of the second radiating elements are arranged in a two-dimensional array. The antenna device according to any one of the above.

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