JP5231341B2 - Antenna device - Google Patents

Description

  The present invention relates to an antenna device including a patch antenna in which a planar antenna element is provided on a front surface of a rectangular parallelepiped dielectric material and an antenna ground is provided on a back surface of the dielectric material.

  In a patch antenna in which a planar antenna element is provided on the front surface of a rectangular parallelepiped dielectric material and an antenna ground is provided on the back surface of the dielectric material, the antenna ground is secured in order to secure a gain in the front direction. It is desirable that the length of one side is a length corresponding to 1/2 to 1 wavelength of the electromagnetic wave used. However, it is difficult to secure a length corresponding to 1/2 to 1 wavelength of the electromagnetic wave used for the reason that the operability is not hindered in a mode mounted on a handy terminal or the like that is held and used by the user. There is a problem. For these reasons, there is a demand for a configuration that can increase the gain in the front direction and increase the F / B ratio even if the physique of the antenna ground cannot be sufficiently secured.

  On the other hand, for example, Patent Document 1 discloses a configuration in which a ring-shaped parasitic element is provided on a side surface portion of a dielectric material in order to ensure directivity in a low elevation angle direction (side surface direction of the dielectric material) of the patch antenna. ing. Further, for example, in Patent Document 2, by providing a parasitic element at an end of an antenna substrate in which an antenna element is provided at the center portion, diffracted waves radiated from the parasitic element and radiation from the end of the antenna substrate are disclosed. A configuration is disclosed in which the diffracted wave is canceled and the diffracted wave as a whole is suppressed.

JP 2005-160050 A JP-A-11-284429

  With the configuration disclosed in Patent Document 1, it is possible to increase the gain in the low elevation angle direction, but it is impossible to increase the gain in the front direction, and it is difficult to increase the F / B ratio. is there. Moreover, in the structure currently disclosed by patent document 2, the parasitic element provided in the edge part of an antenna board | substrate needs to be the length equivalent to 1 wavelength of electromagnetic waves to be used, and it is a factor which obstructs size reduction of a physique. Become.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an antenna apparatus that can increase the F / B ratio and can reduce the size of the entire apparatus. is there.

  According to the first aspect of the present invention, the parasitic element formed in the ring shape having the entire length corresponding to one wavelength of the used electromagnetic wave transmitted and received by the patch antenna is flush with the ground plane of the antenna ground of the patch antenna. Since it is provided so as to go around the side surface of the antenna ground on the upper side or the back side of the ground surface, when power is supplied to the antenna element of the patch antenna, electromagnetic waves are radiated from the antenna element of the patch antenna in the front direction. At the same time, an induced current is generated in the parasitic element, the current distribution flowing through the parasitic element becomes a new radiation source of the electromagnetic wave, and the electromagnetic wave is also radiated from the parasitic element in the front direction. Thereby, the gain in the front direction can be increased by combining the electromagnetic wave radiated in the front direction from the antenna element of the patch antenna and the electromagnetic wave radiated in the front direction from the parasitic element. The ratio can be increased. In this case, the length of one side of the antenna ground does not need to be a length corresponding to 1/2 to 1 wavelength of the electromagnetic wave used, the size of the antenna ground can be reduced, and the size of the entire apparatus can be reduced. can do.

In addition , since the parasitic element is formed in a shape having a bent portion, the parasitic element is made smaller in size than the case where the parasitic element is formed in a linear shape by the amount of the bent portion. And the size of the entire apparatus can be further reduced.

Furthermore , since the parasitic element is formed in a shape having a bent portion at a portion facing the vicinity of the boundary between the side portions of the antenna ground, the current distribution becomes sparse near the boundary between the side portions of the antenna ground. By providing the bent portion at the portion where the current distribution is sparse, it is possible to suppress a decrease in the radiation efficiency of the electromagnetic wave from the parasitic element due to the bent portion.

According to the invention described in claim 2 , since the parasitic element is formed in the shape having the matching element connecting portion to which the matching element is connected, the parasitic element is formed in a linear shape by the amount corresponding to the matching element connecting portion. The physique of the parasitic element can be made smaller than the case, and the physique of the entire apparatus can be further reduced in size.

According to the invention described in claim 3 , since the parasitic element is formed in the shape having the matching element connecting portion in the portion facing the vicinity of the boundary between the side portions of the antenna ground, the vicinity of the boundary between the side portions of the antenna ground. Since the current distribution becomes sparse, a decrease in the radiation efficiency of the electromagnetic wave from the parasitic element due to the matching element connection part can be suppressed by providing a matching element connection part in the part where the current distribution is sparse. .

According to the invention described in claim 4 , since the parasitic element is formed on the high dielectric constant substrate, the size of the parasitic element can be reduced, and the size of the entire apparatus can be further reduced. .

According to the invention described in claim 5 , the feed element formed in a ring shape having a total length corresponding to one wavelength of the electromagnetic wave used by the patch antenna is transmitted and received on the same plane as the ground plane of the antenna ground of the patch antenna. Alternatively, since it is provided so as to go around the side surface of the antenna ground on the back side from the ground surface, when power is supplied to the antenna element of the patch antenna and also to the power supply element, the antenna element of the patch antenna The electromagnetic wave is radiated in the front direction, and the electromagnetic wave is also radiated from the feed element in the front direction. Thereby, the gain in the front direction can be increased by combining the electromagnetic wave radiated in the front direction from the antenna element of the patch antenna and the electromagnetic wave radiated in the front direction from the feed element, and the F / B ratio. Can be increased. Also in this case, the length of one side of the antenna ground does not have to be a length corresponding to 1/2 to 1 wavelength of the electromagnetic wave used, and the size of the antenna ground can be reduced, and the overall size of the apparatus can be reduced. Can be miniaturized.

According to the invention described in claim 6 , since the power feeding element is formed in a shape having a bent portion, the power feeding element is formed more than the case where the power feeding element is formed in a linear shape by the amount having the bent portion. The physique of can be made small, and the physique of the whole apparatus can be further reduced in size.

According to the seventh aspect of the present invention, since the feeding element is formed in a shape having a bent portion at a portion facing the vicinity of the boundary between the side portions of the antenna ground, the current flows near the boundary between the side portions of the antenna ground. Since the distribution is sparse, by providing a bent portion at a portion where the current distribution is sparse, it is possible to suppress a decrease in radiation efficiency of the electromagnetic wave from the power feeding element due to the bent portion.

According to the eighth aspect of the present invention, since the feeding element is formed in a shape having a matching element connecting portion to which the matching element is connected, the feeding element is formed in a linear shape corresponding to the matching element connecting portion. Therefore, the physique of the power feeding element can be made smaller, and the physique of the entire apparatus can be further reduced in size.

According to the ninth aspect of the present invention, since the feeding element is formed in a shape having the matching element connecting portion in the portion facing the vicinity of the boundary between the side portions of the antenna ground, in the vicinity of the boundary between the side portions of the antenna ground, Since the current distribution becomes sparse, by providing the matching element connection portion at the portion where the current distribution becomes sparse, it is possible to suppress a decrease in the radiation efficiency of the electromagnetic wave from the power feeding element due to the matching element connection portion.

According to the invention described in claim 10 , since the feed element is formed on the high dielectric constant substrate, the size of the feed element can be reduced, and the size of the entire apparatus can be further reduced in size.

According to the eleventh aspect of the present invention, the power supply intensity ratio between the power supply to the patch antenna and the power supply to the power supply element is set to a predetermined ratio. By doing so, the gain in the front direction can be further increased, and the F / B ratio can be further increased.

According to the twelfth aspect of the present invention, since the feeding phase difference between the feeding to the patch antenna and the feeding to the feeding element is set to a predetermined angle, the feeding is performed with the feeding phase difference that can increase the gain in the front direction. By doing so, the gain in the front direction can be further increased, and the F / B ratio can be further increased.

The perspective view and side view which show one Embodiment of this invention Longitudinal side view schematically showing the internal configuration of the handy terminal (A) is a figure which shows roughly the structure used for the measurement, (b) is a figure which shows the change of the gain with respect to the outer periphery length of a parasitic element. (A) is a diagram showing a change in directivity, (b) is a diagram showing a current distribution of vertical polarization, and (c) is a diagram showing a current distribution of horizontal polarization. (A) is a diagram schematically showing a configuration used for measurement, (b) is a diagram showing changes in gain and F / B ratio with respect to the feeding intensity ratio, and (c) is a gain and F / B ratio with respect to the feeding phase difference. Diagram showing changes in Diagram showing the procedure for forming parasitic elements and feeder elements The figure which shows the relationship between the patch antenna and the parasitic element and the feeding element

Hereinafter, an embodiment in which the antenna device of the present invention is applied to an antenna device mounted on a handy terminal that is held and used by a user will be described with reference to the drawings.
FIG. 2 schematically shows the internal structure of the handy terminal in a longitudinal side view. The handy terminal 1 uses, for example, a function for reading recorded data (for example, an article code) recorded on an RFID tag 2 attached to an article such as a product with an electromagnetic wave and an information code 3 such as a barcode or a two-dimensional code. Reading function. In this case, the used electromagnetic wave is, for example, an electromagnetic wave in the UHF band of 950 [MHz], and can be communicated over a long distance as compared with, for example, the HF band or the microwave band. The communication distance is assumed. In addition to the function of reading the recording data recorded on the RFID tag 2, the recording data may be written on the RFID tag 2.

  The RFID tag 2 includes a rectifier circuit and a smoothing circuit that obtains an operating power from electromagnetic waves received from the handy terminal 1, a CPU that controls RFID communication, a modulation / demodulation circuit that modulates a transmission signal and demodulates a reception signal, and a control program And a memory for storing recording data and the like are configured in one chip.

  In the handy terminal 1, the base end side (right side in FIG. 2) of the housing 4 is a holding portion 4a having a linear shape that can be gripped by the user, and the distal end side (left side in FIG. 2) of the housing 4 is gradually increased. The reading unit 4b has a shape that is widened and bent so as to incline downward toward the front. The casing 4 is mainly configured by an RFID communication unit 5 that performs RFID communication with the RFID tag 2 through electromagnetic waves, an optical information reading unit 6 that optically reads the barcode 3, and a microcomputer. A control circuit 7, a display unit 8 including a liquid crystal display device, an operation unit 9 in which a plurality of keys are arranged, a battery pack 10, a printed wiring board 11, and the like are incorporated.

  The optical information reading unit 6 includes an image pickup device 12 made of, for example, a CCD area sensor, and a camera unit 14 disposed in the vicinity of the inside of the reading port 13 that is the front end side of the housing 4. The camera unit 14 is configured by unitizing an imaging lens 15 and an illumination light source 16 composed of a plurality of LEDs. In this case, when the user performs a reading operation with the operation unit 9 with the reading port 13 directed to the information code 3 to be read, the illumination light emitted from the illumination light source 16 is applied to the information code 3 and the reflection thereof. Light enters the imaging device 12 through the imaging lens 15, and an imaging signal output from the imaging device 12 is input to the control circuit 7 through the cable 17 and the printed wiring board 11. When the image pickup signal output from the image pickup device 12 is input, the control circuit 7 decodes the image data included in the image pickup signal and decodes the content recorded in the information code 3.

  The RFID communication unit 5 is configured by an antenna device 18 that is arranged below the printed wiring board 11 in a mode supported by the printed wiring board 11 by a support mechanism (not shown). FIG. 1 shows a perspective view and a side view of the antenna device 18. Hereinafter, the antenna device 18 will be described in detail.

  The antenna device 18 includes a patch antenna 19 and a ring-shaped parasitic element 20 disposed around the patch antenna 19. The patch antenna 19 is configured such that a planar antenna element 22 is disposed on a front surface portion 21 a of a rectangular parallelepiped dielectric material 21 and an antenna ground 23 is disposed on a rear surface portion 21 b of the dielectric material 21.

  The antenna element 22 is provided with a feeding point 24 at a position slightly off one side (the lower side in FIG. 1) from the center position. The antenna ground 23 is formed in a concave shape by being bent at a right angle in a direction (backward direction) opposite to a direction (front direction) on which the four sides of the square plate are mounted with the dielectric material 21. And four side surfaces 23b to 23e. In this case, the length of each side in the plane direction of the antenna ground 23 (the length of each side of the front portion 23a) (indicated by “L1” in FIG. 1) is 50 [mm], which is about 1 of the electromagnetic wave used. A length corresponding to / 4 wavelength. The height of the antenna ground 23 (the length in the height direction of the side portions 23b to 23e) (indicated by “H1” in FIG. 1) is 8 [mm], and the height of the dielectric material 21 and the antenna ground 23 The sum of the height (indicated by “H2” in FIG. 1) is 15 [mm]. The antenna ground 23 is formed in a shape having a front surface portion 23a on one surface and side surface portions 23b to 23e on four surfaces (the entire surface is concave). The front part 23a and the side parts 23b to 23e act as a ground plane.

  The parasitic element 20 is formed in a “B” -shaped ring shape in which four side portions 25 to 28 are connected so as to go around the four side portions 23 b to 23 e of the antenna ground 23. The side portions 25 to 28 face the side surface portions 23 b to 23 e of the antenna ground 23 with a predetermined interval, and are disposed on the same plane as the ground surface of the antenna ground 23. In this case, the center position of the patch antenna 19 in the vertical direction (direction orthogonal to the ground plane of the antenna ground 23) and the center position of the parasitic element 20 in the vertical direction are the same.

  The meander portions 25a to 28a and 25b to 28b (referred to in the present invention) are located on the four sides 25 to 28 constituting the parasitic element 20 and facing the vicinity of the boundary between the side portions 23b to 23e of the antenna ground 23. A bent portion) is formed. In this case, the length of each side of the parasitic element 20 in the planar direction (indicated by “L2” in FIG. 1) is 54 [mm], and adjacent sides of the meander portions 25a to 28a and 25b to 28b are adjacent to each other. The interval (indicated by “D” in FIG. 1) is 3 [mm]. The heights of the meander portions 25a to 28a and 25b to 28b are the same as the height of the antenna ground 23 (8 [mm]). The line width of the parasitic element 20 is 0.5 [mm].

  The meander portions 25a to 28a and 25b to 28b are formed to secure a length corresponding to about one wavelength of the used electromagnetic wave as the total length (path length) of the parasitic element 20, and correspond to about one wavelength of the used electromagnetic wave. There is an advantage that the size of the parasitic element 20 can be reduced (the opening area of the ring can be reduced) as compared with the case where the parasitic element having the length to be formed is formed in a linear shape (a shape in which the meander portion is not formed). Even when the matching elements are connected instead of forming the meander portions 25a to 28a and 25b to 28b, the same effect can be obtained. Further, even when the parasitic element 20 is formed on a high dielectric constant substrate, the same effect can be obtained.

  According to the configuration described above, when power is supplied to the feeding point 24 of the antenna element 22, electromagnetic waves are radiated from the antenna element 22 in the front direction (indicated by “arrow A” in FIG. 1). An induced current is generated in the ring-shaped parasitic element 20 that is arranged on the same plane as the ground plane, and the current distribution flowing through the parasitic element 20 becomes a new radiation source of electromagnetic waves. Is emitted in the front direction. As a result, the electromagnetic wave radiated in the front direction from the antenna element 22 and the electromagnetic wave radiated in the front direction from the parasitic element 20 are combined, thereby increasing the gain in the front direction and increasing the F / B ratio. It is done.

  The inventor measured how much the gain in the front direction can be increased by the above-described configuration, that is, the configuration in which the ring-shaped parasitic element 20 is arranged on the same plane as the ground surface of the antenna ground 23. FIG. 3A schematically shows the configuration of the antenna device used for the measurement. In the antenna device 31 shown in FIG. 3A, a planar antenna element 33 is disposed on the front surface of a rectangular parallelepiped dielectric material 32, and a substrate 34 is disposed on the back surface of the dielectric material 32. The antenna element 32 is provided with a feeding point 35 at a position slightly off one side from the center position. The substrate 34 has a square inner conductor region 36 (a hatched region in FIG. 3) and a ring outer conductor region 37 (a cross hatched region in FIG. 3). Are formed with the insulating region 38 interposed therebetween. That is, the patch antenna composed of the dielectric material 32, the antenna element 33, and the inner conductor region 36 is equivalent to the patch antenna 19 described in FIG. 1, and the outer conductor region 37 is the parasitic element described in FIG. 20, and the four sides of the outer conductor region 37 are equivalent to the four sides 25 to 28 of the parasitic element 20 described in FIG. 1.

  FIG. 3B shows a change in the gain in the front direction when the circumferential length (outer circumferential length) of the outer conductor region 37 equivalent to a ring-shaped parasitic element is changed. As apparent from FIG. 3B, when the wavelength of the electromagnetic wave used is “λ”, the practical level is obtained when the circumferential length of the outer conductor region 37 is set to a range of about 0.97 to 1.1λ. It can be seen that a gain of, for example, 4 [dBi] or more that can be guaranteed is secured.

  FIG. 4A shows a change in directivity due to the provision of an outer conductor region 37 equivalent to a ring-shaped parasitic element. As is clear from FIG. 4A, it is understood that the directivity is biased in the front direction as a whole by providing the outer conductor region 37.

  FIG. 4B shows a change in current distribution. As is clear from FIG. 4B, the distribution of current flowing in two opposing sides of the four sides of the outer conductor region 37 is dense (strong) at the center side, but sparse (weak) at the end side. )Become. That is, in this embodiment, the meander portions 25a to 28a and 25b to 28b are formed at locations where the current distribution is sparse, and the meander portions 25a to 28a and 25b to 28b are formed at locations where the current distribution is sparse. Thus, there is an advantage of suppressing a decrease in the radiation efficiency of the electromagnetic wave from the parasitic element 20 due to the meander portions 25a to 28a and 25b to 28b. 4B shows the current distribution of vertical polarization, the current distribution of horizontal polarization is the same as shown in FIG. 4C.

  Further, the inventor measured how much the gain in the front direction can be increased by disposing the feed element instead of the parasitic element 20. FIG. 5A shows the configuration of the antenna device used for the measurement. In the antenna device 41 shown in FIG. 5A, a planar antenna element 43 is disposed on the front surface of a rectangular parallelepiped dielectric material 42, and a substrate 44 is disposed on the back surface of the dielectric material 42. The antenna element 42 is provided with a feeding point 45 at a position slightly off one side from the center position. The substrate 44 has a square inner conductor region 46 (a hatched region in FIG. 5) and a ring outer conductor region 47 (a cross hatched region in FIG. 5). Are formed with the insulating region 48 interposed therebetween. That is, the patch antenna composed of the dielectric material 42, the antenna element 43, and the inner conductor region 46 is equivalent to the patch antenna 19 described in FIG. In this case, the feeding point 49 is provided on one of the four sides of the outer conductor region 47, and the outer conductor region 47 functions as a feeding element.

FIG. 5B shows changes in the gain and F / B ratio in the front direction when the feed strength ratio of the outer conductor region 57 equivalent to the patch antenna and the feed element is changed. As is apparent from FIG. 5B, when the feed strength ratio between the patch antenna and the feed element is in the range of 1: 0.4 to 0.4: 1, it can be guaranteed as a practical level, for example, 6 [dB]. It can be seen that the above F / B ratio is secured.

  FIG. 5C shows changes in the gain and F / B ratio in the front direction when the feed phase difference ratio between the patch antenna and the outer conductor region 57 equivalent to the feed element is changed. As is clear from FIG. 5C, the feeding phase difference between the patch antenna and the feeding element is −20 to −80 degrees when feeding to the patch antenna is a reference (feeding to the patch antenna is feeding to the patch antenna). It can be seen that an F / B ratio of, for example, 6 [dB] or more that can be guaranteed as a practical level is ensured when the range of 20 to 80 degrees is set.

  By the way, as a method of forming the parasitic element and the feeding element described above, there is a method shown in FIG. That is, as shown in FIG. 6A, a parasitic element or a feeding element may be formed by bending a wire 51 or a linear member cut out from a conductive flat plate member. Further, as shown in FIG. 6B, a conductive pattern 53 corresponding to the shape of a parasitic element or a feeding element is formed on a flexible flexible substrate 52, and the flexible substrate 52 is wound around a patch antenna. good. Further, as shown in FIG. 6C, one plane side of the double-sided board 54 is used as an antenna ground of the patch antenna, and a conductor pattern 55 corresponding to the shape of a parasitic element or a feed element is provided on the other plane side. It may be formed. Further, as shown in FIG. 6D, a linear conductor pattern 57 may be formed on the substrate 56, and the meander portion may be formed by a wire 58. Furthermore, if it is the structure mounted in the handy terminal 1, you may form the conductor pattern equivalent to the shape of a parasitic element or a feed element inside the housing | casing 4 by metal vapor deposition.

  Further, as shown in FIG. 7A, by forming an inner conductor region 62 and an outer conductor region 63 on a rectangular substrate 61, the inner conductor region 62 equivalent to the antenna ground is made rectangular. It is also possible to form the outer conductor region 63 that is equivalent to a parasitic element or a feeder element in a shape having a rectangular opening. Further, as shown in FIG. 7B, the vertical center position of the dielectric material 32 and the vertical center position of the rectangular substrate 61 may not be the same. Further, as shown in FIG. 7C, a first substrate 64 is provided, a second substrate 65 is provided on the back side of the first substrate 64, and the first substrate 64 is equivalent to an antenna ground. By forming an inner conductor region 66 and forming an outer conductor region 67 equivalent to a parasitic element or a feeder element on the second substrate 65, the inner conductor region 66 and the outer conductor region 67 are separated from each other. You may form in. That is, a parasitic element or a feeding element may be provided on the back side of the ground surface of the antenna ground.

  As described above, according to this embodiment, the ring-shaped parasitic element 20 having the entire length corresponding to one wavelength of the electromagnetic wave used by the patch antenna 19 is transmitted to the ground plane of the antenna ground 23 of the patch antenna 19. Since the configuration is such that the side surfaces 23b to 23e of the antenna ground 23 circulate on the same plane, when power is supplied to the patch antenna 19, electromagnetic waves are radiated from the patch antenna 19 in the front direction, and the parasitic element Inductive current is generated in 20 and the current distribution flowing through the parasitic element 20 becomes a new radiation source of electromagnetic waves. And the electromagnetic wave radiated from the parasitic element 20 in the front direction can be combined to increase the gain in the front direction. Can be can be, increase the F / B ratio.

  In addition, if the power feeding element is provided instead of the parasitic element 20, the patch antenna 19 is fed and when the power feeding element is also fed, an electromagnetic wave is emitted from the patch antenna 19 in the front direction. Electromagnetic waves are also radiated in the front direction from the feed element, and the gain in the front direction is increased by combining the electromagnetic waves radiated in the front direction from the patch antenna 19 and the electromagnetic waves radiated in the front direction from the feed element. And the F / B ratio can be increased. In this case, the length of one side of the antenna ground 23 does not need to be a length corresponding to 1/2 to 1 wavelength of the electromagnetic wave used, and the size of the antenna ground 23 can be reduced, and the size of the entire apparatus can be reduced. It can be downsized.

The present invention is not limited to the above-described embodiment, and can be modified or expanded as follows.
The configuration is not limited to an antenna device mounted on a handy terminal that is held and used by a user, and may be a configuration applied to an antenna device for other purposes.
A configuration may be adopted in which two feeding points are provided in the antenna element of the patch antenna to switch between vertical polarization and horizontal polarization.

  In the drawings, 18 is an antenna device, 19 is a patch antenna, 20 is a parasitic element, 21 is a dielectric material, 21a is a front portion, 21b is a back portion, 22 is an antenna element, 23 is an antenna ground, and 23b to 23e are side portions. , 25a to 28a and 25b to 28b are meander portions (folded portions), 31 is an antenna device, 32 is a dielectric material, 33 is an antenna element, 36 is an inner conductor region (antenna ground), and 37 is an outer conductor region ( Parasitic element), 41 is an antenna device, 42 is a dielectric material, 43 is an antenna element, 46 is an inner conductor region (antenna ground), and 47 is an outer conductor region (feed element).

Claims (12)

A patch antenna in which a planar antenna element is provided on the front surface of a rectangular parallelepiped dielectric material and an antenna ground is provided on the back surface of the dielectric material;
It is formed in a ring shape having a total length corresponding to one wavelength of the electromagnetic wave used by the patch antenna, and the antenna ground is on the same plane as the antenna ground of the patch antenna or on the back side of the ground plane. A parasitic element provided so as to go around the side surface ,
The antenna device, wherein the parasitic element is formed in a shape having a bent portion at a portion facing a boundary between side portions of the antenna ground . The antenna device according to claim 1, wherein
The parasitic element is formed in a shape having a matching element connecting portion to which a matching element is connected . In the antenna device according to claim 2,
The antenna device is characterized in that the parasitic element is formed in a shape having the matching element connecting portion at a portion facing the vicinity of a boundary between side portions of the antenna ground. The antenna device according to claim 1, wherein
The parasitic element is formed on a high dielectric constant substrate . A patch antenna in which a planar antenna element is provided on the front surface of a rectangular parallelepiped dielectric material and an antenna ground is provided on the back surface of the dielectric material;
It is formed in a ring shape having a total length corresponding to one wavelength of the electromagnetic wave used by the patch antenna, and the antenna ground is on the same plane as the antenna ground of the patch antenna or on the back side of the ground plane. An antenna device comprising: a feeding element provided so as to go around the side surface portion . The antenna device according to claim 5 , wherein
Before SL feeding conductive element is an antenna apparatus characterized by being formed into a shape having a fold portion are folded. The antenna device according to claim 6, wherein
The antenna device, wherein the feeding element is formed in a shape having the bent portion at a portion facing the vicinity of a boundary between side portions of the antenna ground . The antenna device according to claim 5 , wherein
The antenna device, wherein the feeding element is formed in a shape having a matching element connecting portion to which a matching element is connected . The antenna device according to claim 8, wherein
The antenna device according to claim 1, wherein the feeding element is formed in a shape having the matching element connecting portion at a portion facing the vicinity of a boundary between side portions of the antenna ground. The antenna device according to claim 5 , wherein
The antenna device is characterized in that the feed element is formed on a high dielectric constant substrate . In the antenna device according to any one of claims 5 to 10 ,
2. An antenna device according to claim 1, wherein a feeding intensity ratio between feeding to the patch antenna and feeding to the feeding element is a predetermined ratio . The antenna device according to any one of claims 5 to 11 ,
An antenna apparatus, wherein a feeding phase difference between feeding to the patch antenna and feeding to the feeding element is a predetermined angle .

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