JP2008294732A - Antenna device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna device capable of making the orientation of beams wide-band and asymmetrical without tilting an antenna itself. <P>SOLUTION: The antenna device includes: a dielectric substrate 1; first and second conductors 2 and 3 which are so formed on the dielectric substrate 1 as to face in opposite directions, keeping a symmetrical relationship about a center line 6 of the dielectric substrate 1, to constitute a tapered slot line 4 on the dielectric substrate 1; the tapered slot line 4 which is constructed on the dielectric substrate 1 as a region held between the first and second conductors 2 and 3, with a line width gradually expanding while keeping a symmetrical relationship about the center line 6 of the dielectric substrate 1, and has its end being an open end; and a feeding means which is installed for a feed point 5 disposed at the other end of the tapered slot line 4 and feeds power to the feed point 5. Either of the first or second conductors 2 and 3, which constitute the tapered slot line 4, is formed with a cutout 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an antenna device, and more particularly to an antenna device having a tapered slot line.

  In recent years, radar and sensor antennas have been selected that have broadband characteristics in order to improve detection and identification performance. One example is a tapered slot antenna (see, for example, Patent Document 1).

  FIG. 6 shows a structure of a general tapered slot antenna with reference to Patent Document 1. In the figure, 41 is a dielectric substrate, 42 is a first conductor patterned on one surface of the dielectric substrate 41, 43 is a second conductor similarly patterned on one surface of the dielectric substrate 41, 44 is formed between the first conductor 42 and the second conductor 43 and has a tapered slot line having a tapered end, 45 is a microstrip line, and 46 is provided at an end of the microstrip line 45. This is a through hole that is electrically connected to the first conductor 42.

  Next, the operation will be described. The input signal is electromagnetically coupled to the taper slot line 44 via the microstrip line 45. At this time, the microstrip line 45 is electrically connected to the first conductor 42 through a through hole 46 provided in the dielectric substrate 41 immediately after intersecting the taper slot line 44. Therefore, the input signal is electromagnetically coupled to the tapered slot line 44 efficiently over a wide band. The signal transmitted to the taper slot line 44 propagates toward the opening end of the taper slot line 44 and radiates from a desired position. In the low frequency range, the light is radiated from the side near the opening end, and in the high frequency range, the light is radiated from the feeding side. That is, since this antenna has a structure in which the slot line width is gradually increased toward the opening end, there is a feature that the matching with the space can be realized over a wide band. In this description, the power supply method using the microstrip line 45 is shown, but the power supply method to the taper slot line 44 may be another type. For example, there is a system using a coaxial line.

  Now, it is conceivable that radars and sensors are affected by reflections from the surrounding environment depending on their use conditions. For example, there is a demand to reduce the influence of the ground radar as much as possible and the ship-borne radar as much as possible from the sea surface. For this reason, it is considered that an array antenna element that reduces radiation in the ground and sea surface directions and radiates only in the coverage direction is effective. In addition, it is generally said that vertically polarized waves are not easily affected by the ground and the sea surface, and have been conventionally used in various radars.

  In the case of the tapered slot antenna described above, the ideal radiation direction is usually the front of the antenna as shown in FIG. For this reason, the amount of radiation is also large in the direction of the ground and the sea surface, and is easily affected. In addition, although the method of arrange | positioning an antenna by inclining to a coverage direction from the beginning is considered, in this case, it is anticipated that it becomes complicated on a structure.

JP 11-163626 A

  As shown in the above description of the prior art, the radiation direction of a general tapered slot antenna is the front of the antenna, and the radiation pattern shape is also substantially symmetric. However, radars and sensors require an asymmetrical coverage by avoiding radiation in the direction of the ground or sea surface depending on the use environment, but there is a problem that the conventional technology as described above cannot cope.

  In Patent Document 1, a taper slot antenna having an asymmetric pattern shape is described as a countermeasure for such a case. However, in this document, as a method for obtaining an asymmetric pattern, dielectrics on both sides of the antenna are described. Since the corrugated structure is provided on the body substrate and the dimensions thereof are different from each other, the manufacturing process is difficult and there is a problem that it cannot be made variable in the beam directing direction.

  The present invention has been made to solve such a problem, and an object of the present invention is to obtain an antenna device capable of making the beam directing direction a broadband and asymmetric without tilting the antenna itself.

  In order to form a tapered slot line in the dielectric substrate and the dielectric substrate, the present invention faces the dielectric substrate so as to maintain a symmetrical relationship with respect to the center line of the dielectric substrate. It is configured on the dielectric substrate as a region sandwiched between the first and second conductors provided, the first conductor and the second conductor, and the line width is set to the center line of the dielectric substrate. A taper slot line that gradually spreads while maintaining a symmetrical relationship with respect to the taper slot line, and a feeding means that feeds the feeding point provided to a feeding point provided at the other end of the tapered slot line. The antenna device is characterized in that a cut is provided in one of the first and second conductors constituting the tapered slot line.

  In order to form a tapered slot line in the dielectric substrate and the dielectric substrate, the present invention faces the dielectric substrate so as to maintain a symmetrical relationship with respect to the center line of the dielectric substrate. It is configured on the dielectric substrate as a region sandwiched between the first and second conductors provided, the first conductor and the second conductor, and the line width is set to the center line of the dielectric substrate. A taper slot line that gradually spreads while maintaining a symmetrical relationship with respect to the taper slot line, and a feeding means that feeds the feeding point provided to a feeding point provided at the other end of the tapered slot line. Since the antenna device is characterized in that a cut is provided in one of the first and second conductors constituting the tapered slot line, the antenna itself is Tilting Ku, it is possible to make the beam pointing direction to broadband and asymmetric.

  Hereinafter, an antenna device according to an embodiment of the present invention will be described. In the embodiment described below, an antenna structure that can handle both transmission and reception will be described as an example.

Embodiment 1 FIG.
FIG. 1 shows a basic configuration of an antenna apparatus according to Embodiment 1 of the present invention. In the figure, 1 is a dielectric substrate having a substantially rectangular plate shape, 2 is a first conductor formed on one surface (main surface) of the dielectric substrate 1, and 3 is a first conductor 2. 2 is a taper slot line configured as a region sandwiched between the first conductor 2 and the second conductor 3, and 5 is a feeding point and is a reference point for convenience. To do. Reference numeral 6 denotes a center line of the tapered slot line passing through the reference point 5, and reference numeral 7 denotes a notch provided in a conductor portion in the middle of the tapered slot line. Each of the first conductor 2 and the second conductor 3 has a shape resembling a quarter shape when the ellipse is cut along the major axis and the minor axis. For this reason, the taper slot line 4 formed between them draws a straight line near the reference point 5 and gradually opens in a tapered shape while drawing a curve toward the opening end. Therefore, it is divided into a straight line part and a curved line part.

  Next, the operation will be described assuming a transmission system. A signal input to the slot line at the reference (feed) point 5 propagates through the tapered slot line 4 and is radiated from a desired position of the tapered slot line 4 depending on the frequency band. In the low frequency range, the light is radiated from the side near the opening end, and in the high frequency range, the light is radiated from the feeding side. The method for feeding power to the taper slot line 4 is not particularly limited, so that it is possible to select an application or one that can be easily connected to a module or the like connected at a later stage.

  Here, assuming the case where the notch 7 is not provided, the curved portions of the first conductor 2 and the second conductor 3 constituting the tapered slot line 4 have a symmetric structure with respect to the center line 6. Will be. At that time, currents of equal amplitude and opposite phase are present at the ends of the taper slot line 4, that is, in the vicinity of the curved portions of the first conductor 2 and the second conductor 3, and at equal distances from the reference point 5. Flowing. The electric field generated due to this current also propagates in the tapered slot line 4 while maintaining the vector direction orthogonal to the center line 6 and is orthogonal to the antenna front direction, that is, the horizontal direction parallel to the center line 6. Radiated with polarization direction.

  In the antenna device according to the first embodiment of the present invention, a notch 7 is provided in the conductor at a desired position of the curved portion of the first conductor 2 as shown in FIG. As a result, the current path is detoured at the notch 7 and the phase is delayed there. As a result, the currents at the positions of the curved portions of the first conductor 2 and the second conductor 3 after the notch 7 and equidistant from the reference point 5 are not in a reverse phase relationship. Therefore, the electric field propagating in the tapered slot line 4 propagates with an inclination not orthogonal to the center line 6 and is radiated at a desired position. As a result, radiation is performed in a direction having a certain inclination as shown in FIG. 1, and the beam directing direction is tilted (asymmetric pattern shape) from the front of the antenna. As described above, in the first embodiment, the beam directing direction can be tilted without tilting the antenna device itself, so that there is an advantage that the mechanical burden is small.

  Moreover, the beam directing direction can be tilted over a wide band by bringing the position where the notch 7 is provided closer to the reference point 5 side.

  Furthermore, although the notch 7 is provided in the direction orthogonal to the center line 6 in FIG. 1, this direction may be arbitrary and the shape is not limited to a rectangle.

  In addition, the conductor provided with the notch 7 may be the second conductor 3 instead of the first conductor 2. In that case, the beam directing direction tilts to the opposite side with the center line 6 as the axis of symmetry.

  As described above, in the first embodiment, the first conductor 2 and the second conductor 3 that are formed so as to gradually spread while maintaining a symmetrical relationship with respect to the center line of the dielectric substrate 1, and those A tapered slot line 4 having an open end and a reference (feeding) point 5 that is provided at the other end of the tapered slot line 4 and that feeds power to the tapered slot line. In the tapered slot antenna, in either one of the first conductor 2 and the second conductor 3 forming the tapered slot line 4, a notch 7 is formed between the reference (feed) point 5 and the open end. Since it is provided, the beam directing direction can be tilted without tilting the antenna device itself, so that the manufacturing process is easy and the mechanical burden is small. Moreover, broadband tilt is also possible.

Embodiment 2. FIG.
In the above-described first embodiment, the antenna device in which the notch 7 is formed in the one end curve of the tapered slot line 4 on one surface of the dielectric substrate 1 has been described, but in the second embodiment, The antenna device in which notches are formed in one end curve of the taper slot line by regarding the conductors patterned on the front and back surfaces of the dielectric substrate 1 as a pair will be described.

  FIG. 2 shows a configuration of an antenna apparatus according to Embodiment 2 of the present invention. In the figure, 11 is a dielectric substrate, 12 is a first conductor formed on the surface of the dielectric substrate 11, 13 is a second conductor formed on the back surface of the dielectric substrate 11, and 14 is a first conductor 12. And parallel two lines configured by considering a part of the second conductor 13 as a pair, 15 is a tapered slot line configured by curved portions of the first conductor 12 and the second conductor 13 facing each other, 16 A microstrip line constituted by combining a strip line constituted by a part of the first conductor 12 and a ground conductor constituted by a part of the second conductor 13, 17 is a parallel two line 14 and a microstrip line 16 is a notch provided in the middle of the taper slot line 15.

  That is, in the second embodiment, as shown in FIG. 2, parallel wires 14 are formed by arranging conductor lines on the front and back surfaces of the dielectric substrate so that the widths are equal and overlap each other. The front ends (open ends) of the parallel two lines 14 are curved and extend in directions opposite to each other, and the extended portions become the first conductor 12 and the second conductor 13. Yes. The first conductor 12 is bent in the upper left direction in the figure, and the second conductor 13 is bent in the lower left direction in the figure. Further, the first conductor 12 and the second conductor 13 are extended while gradually changing the widths of the first conductor 12 and the second conductor 13 so as to gradually spread in the extending direction. It is a radiation part patterned as a structure. As described above, since the first conductor 12 and the second conductor 13 are provided on the dielectric substrate 11, a tapered slot line 15 is formed in a portion surrounded by these conductors. Further, at a desired position between the feeding point of the parallel two wires 14 and the open end inside one of the first conductor 12 and the second conductor 13 constituting the tapered slot line 15, a desired A cut 18 having a length is provided. In the example of FIG. 2, a cut 18 is formed in the second conductor 13. Although not shown, a power feeding means (power feeding point) to the microstrip line 16 is provided at the other end (power feeding point) of the microstrip line 16.

  Next, the operation will be described. As described above, the antenna opening side end (opening end) of the parallel two lines 14 draws a curve in a direction in which the first conductor 12 and the second conductor 13 do not overlap with each other, and changes the conductor width. Patterning. As a result, as shown in the figure, a tapered slot line 15 is formed by pairing the first conductor 12 and the second conductor 13. On the other hand, the feeding end (feeding point) of the parallel two lines 14 is connected to the taper balun 17 and further to the microstrip line 16 by regarding the first conductor 12 and the second conductor 13 as a pair. By adopting this structure, a signal (an electric field in a direction perpendicular to the paper surface of the drawing) input from the power supply side end of the microstrip line 16 is efficiently parallel to the two wires through the taper balun 17. 14 propagates. Subsequently, since the first conductor 12 and the second conductor 13 are gradually expanded from the parallel two lines 14 to form the tapered slot line 15, power is smoothly supplied to the tapered slot line 15 without electromagnetic coupling in the middle. Is possible. The electric field gradually rotates as it propagates in the taper slot line 15, and is in a direction substantially parallel to the drawing sheet. Thereafter, it further propagates through the tapered slot line 15 and radiates from a desired position, and operates as a tapered slot antenna that generates linearly polarized waves in a direction substantially parallel to the paper surface of the figure.

  Here, since the notch 18 is provided in the conductor at a desired position of the curved portion of the second conductor 13 as shown in FIG. 2, the current path is bypassed in the notch 18 portion. Therefore, the phase flowing through the end of the taper slot is delayed. As a result, the currents at the positions of the curved portions of the first conductor 12 and the second conductor 13 after the notch 18 and at the same distance from the parallel two lines 14 are not in a reverse phase relationship. Therefore, the electric field propagating in the taper slot line 15 propagates with a slope that is not orthogonal to the center line of the taper slot line 15 and is radiated at a desired position. As a result, as in FIG. 1, radiation is performed in a direction with a certain inclination, and the beam directing direction is tilted from the front of the antenna. As described above, since the beam directing direction can be tilted without tilting the antenna itself, there is an advantage that the mechanical burden is small.

  Moreover, the beam directing direction can be tilted over a wide band by bringing the position where the notch 18 is provided closer to the parallel two-line 14 side.

  Further, the direction and shape of the notch 18 are not limited to those shown in FIG. In addition, the conductor provided with the notch 18 may be the first conductor 12 instead of the second conductor 13. In that case, the beam directing direction is tilted to the opposite side with respect to the line segment obtained by extending the center line of the tapered slot line 15 as an axis.

  There is also an advantage that the microstrip line 16 to the taper slot line 15 can be easily manufactured only by the patterning of the conductor using the dielectric substrate. In addition, since the power is fed by a microstrip line, it is easy to connect to a module or the like connected to the latter stage of the antenna, and the module can be integrally mounted on the antenna substrate.

  As described above, in the present embodiment, conductor lines are arranged parallel to the front surface and the back surface of the dielectric substrate 11 so that the widths are equal and their positions overlap each other (when viewed from above). The two conductors 14 are formed, and the conductors in the front and back surfaces are extended while gradually changing the width so that the width of the tip of the parallel two wires 14 gradually increases in the extending direction. It is configured as a region sandwiched between the first and second conductors 12 and 13 and the parallel two lines 14 and the first and second conductors 12 and 13, and the line width is the center line of the dielectric substrate 1. A tapered slot line 15 is provided which gradually spreads while maintaining a symmetrical relationship with respect to each other, the tip of which is a radiating portion (open end), and a feeding means (feeding point) to the tapered slot line 15 is provided at the end of the parallel two lines 14 Tapered slot antenna for Since the notch 18 is provided between the feeding point of the parallel two lines 14 and the open end on the inner side of one of the first and second conductors 12 and 13 constituting the tapered slot line 15, Since the beam directing direction can be tilted without tilting the antenna device itself, the manufacturing process is easy and the mechanical burden is small. Moreover, broadband tilt is also possible.

Embodiment 3 FIG.
In the second embodiment described above, the antenna device is described in which the conductors patterned on the front and back surfaces of the dielectric substrate are regarded as a pair to form a tapered slot line, and a notch is formed in the middle of one of the conductors. However, in the third embodiment, an antenna apparatus having a structure in which notches and switches for switching between short-circuiting / opening of the notches are provided in both conductors constituting the tapered slot line will be described.

  FIG. 3 shows the structure of a tapered slot antenna according to the third embodiment. In the figure, 21 is a dielectric substrate, 22 is a first conductor formed on the back surface of the dielectric substrate 21, 23 is a second conductor formed on the surface of the dielectric substrate 21, and 24 is a second conductor in the middle of the slot line. 1 is a notch provided in the conductor 22, 25 is a switch loaded on the notch 24, 26 is a notch provided in the second conductor 23 in the middle of the slot line, and 27 is on the notch 26. Loaded switch. The shapes of the first conductor 22 and the second conductor 23 are basically the same as the shapes of the first conductor 12 and the second conductor 13 shown in FIG. Is omitted.

  Next, the operation will be described. Since the basic operation as a taper slot antenna of a type fed by a microstrip line has been described in Embodiment 2, it is omitted here. Here, as shown in FIG. 3, a notch 24 and a notch 26 are provided at desired positions of the curved portions of the first conductor 22 and the second conductor 23, respectively. As described in the second embodiment, the effect of these notches is that the current path is detoured at the notch, and the phase flowing through the end of the taper slot is delayed. Due to this phenomenon, the electric field propagating in the tapered slot line is inclined, and the beam directing direction is tilted when radiated. By the way, the notch 24 and the notch 26 are loaded with a switch 25 and a switch 27 for switching the short-circuit / opening of the notch, respectively, and these alternately switch the ON / OFF state. With this operation, when the notch 24 is open, the notch 26 is short-circuited. Conversely, when the notch 24 is short-circuited, the notch 26 is open. Therefore, by loading the switch, the effect of the notch can be switched between the first conductor 22 and the second conductor 23, so that the beam directing direction can be switched. Since the beam directing direction can be switched by a single element without tilting the antenna itself, the mechanical burden is small, and there is an effect that it can be realized in a space-saving manner.

  Moreover, as a switch, application of a semiconductor switch or a MEMS switch can be considered. In FIG. 3, two switches are provided in each notch, but the number of switches is not limited, and any number can be provided.

  Further, in FIG. 3, both the first conductor 22 and the second conductor 23 are provided with a notch 24 and a switch 25, and a notch 26 and a switch 27. Even in a structure in which only the notch 24 and the switch 25 are provided and not provided in the second conductor 23, the radiation pattern can be switched between a symmetric shape and an asymmetric shape by switching the ON / OFF state of the switch 25. Moreover, when it is provided only on the second conductor 23 side, it is possible to switch the radiation pattern whose tilt direction is different from the above.

  FIG. 4 shows a modification of the third embodiment, and shows the structure of a tapered slot antenna in which a plurality of notches loaded with switches are provided in each conductor. In the figure, 28 is formed at a position close to the opening end and is effective in a low frequency band, and a switch 29 is formed at a position closer to the feeding point than 28 and is effective in a high frequency band. Some notches and switches.

  The operation of FIG. 4 will be described. The basic operation as a tapered slot antenna that is fed by a microstrip line and that can switch the beam directing direction has been described above, and is therefore omitted here. In this modification, as shown in FIG. 4, since the notch and the switch 28 are provided on the antenna opening side, the notch and the switch 29 are provided on the power feeding side. Therefore, it operates in a high frequency band. Accordingly, there is an advantage that the beam directing direction can be switched over a wide band by switching to use either 28 or 29. Note that the number of notches and switches is not limited, and the wider the number, the wider the bandwidth.

  In the above description, the example of switching to use either 28 or 29 has been described. However, the present invention is not limited to this, and all the cuts on the first conductor side are turned ON and the cuts on the second conductor side are made. It is also possible to perform switching so that all are turned off (or vice versa).

  In addition, the length of the cut can be changed as appropriate, and the number of loads may be different on the first conductor side and the second conductor side. A combination of these may be applied.

  As described above, in the present embodiment, similarly to the second embodiment, the conductor lines are arranged on the front surface and the back surface of the dielectric substrate 21 so as to have the same width and overlap each other. The first and second conductors 22 and 23 in the front and back surfaces are extended while gradually changing their widths so that the ends of the parallel two lines gradually spread in the extending direction. A tapered slot antenna having a radiating portion (opening end) patterned as a structure and having a feeding means (feeding point) to the tapered slot line at the other end, which is a first slot constituting the tapered slot line Inside each of the conductor lines of the conductor 22 and the second conductor 23, a cut is provided between the feed point of the parallel two lines to the open end, and a short-circuit / open state switching means is provided at both cut portions. As a result, the same effects as those of the second embodiment described above can be obtained, and furthermore, in this embodiment, the switch is loaded so that the first conductor 22 and the second conductor 23 are notched. Therefore, the beam directing direction can be switched.

  In the third embodiment, an example in which a switch is provided for the same configuration as that of the second embodiment has been described. However, the present embodiment is not limited to this case, and the present embodiment is applied to the configuration of the first embodiment shown in FIG. The switch described in the third embodiment may be applied.

Embodiment 4 FIG.
In the above-described third embodiment, the antenna device having a structure in which the radiation direction can be switched by the tapered slot antenna provided with the notch and the switch has been described. In this embodiment, the antenna device described in the third embodiment is described. An array antenna using a tapered slot antenna that enables beam tilt as an element will be described.

  FIG. 5 shows the fourth embodiment and shows a conceptual structure of an array antenna having a tapered slot antenna as an element antenna. In the figure, 31 is a reflector, 32 is an element antenna, and 33 is an array pattern directing direction. As shown in FIG. 5, a plurality of element antennas 32 are arranged in a substantially lattice pattern on one surface of the reflector 31. However, since the height positions are shifted every other vertical column, adjacent element antennas are disposed so as to partially overlap in the height direction.

  Next, the operation will be described. A module incorporating an amplifier, a phase shifter, etc., a distribution / synthesis circuit, and the like are arranged at the subsequent stage of the reflector 31 to constitute an active phased array antenna. The radiation mechanism for beam tilting from the power feeding in the element antenna 32 and the mechanism for changing the beam tilt direction have been described in the above-described embodiment, and will be omitted. Since each element antenna can realize radiation in which the beam directing direction is tilted obliquely upward from the ground, the array pattern by directivity synthesis can also increase the gain in that direction as compared with the conventional case. Further, even if the beam scanning is performed further upward, the gain reduction can be reduced as compared with the conventional case. Furthermore, unnecessary radiation to the ground can be reduced, and performance degradation due to reflected waves or the like can be prevented.

  In FIG. 5, the element antenna 32 is arranged on a plane such as the reflector 31. However, the present invention is not limited to this. For example, the element antenna 32 is arranged three-dimensionally on a curved surface or a polyhedron. May be. Moreover, there is no problem even if it is arranged in one dimension as a simple form.

  In FIG. 5, the mechanism for supplying power to the two parallel wires is configured on the back side of the reflector 31. In this case, the reflector is provided with an appropriately sized hole so as not to conduct with the two parallel lines. The hole shape may be arbitrary. For example, the element antenna 32 may be formed in a slot shape so that it can be inserted and removed from the entire surface of the reflector 31.

  Furthermore, by arranging the element antenna 32 horizontally with respect to the ground so as to radiate horizontally polarized waves, the beam tilt direction can be switched in the horizontal plane.

  As described above, in the present embodiment, the tapered slot antenna shown in the third embodiment is used as an element antenna, and a plurality of them are arranged to form an array antenna. The same effect can be obtained, and each element antenna can realize radiation in which the beam directing direction is tilted obliquely upward from the ground. Therefore, the array pattern by directivity synthesis can also increase the gain in the same direction compared to the conventional case. Further, even if beam scanning is performed further upward, the gain reduction can be reduced as compared with the conventional case. Furthermore, unnecessary radiation to the ground can be reduced, and performance degradation due to reflected waves or the like can be prevented.

  In this embodiment, an example in which the tapered slot antenna shown in Embodiment 3 is used as an element antenna and a plurality of them are arranged to form an array antenna has been described. However, Embodiments 1 and 2 have been described. The taper slot antenna may be an element antenna, and a plurality of them may be arranged to constitute an array antenna. In this case, it goes without saying that the same effect can be obtained.

It is the top view which showed the structure of the antenna device which concerns on Embodiment 1 of this invention. It is the top view which showed the structure of the antenna device which concerns on Embodiment 2 of this invention. It is the top view which showed the structure of the antenna device which concerns on Embodiment 3 of this invention. It is the top view which showed the structure of the modification of the antenna device which concerns on Embodiment 3 of this invention. It is the top view which showed the structure of the antenna device which concerns on Embodiment 4 of this invention. It is explanatory drawing which showed the structure of the conventional general taper slot antenna.

Explanation of symbols

  1, 11, 21, 41 Dielectric substrate, 2, 12, 22, 42 First conductor, 3, 13, 23, 43 Second conductor, 4, 15, 44 Tapered slot line, 5 Reference point (feed point) ), 6 center line, 7, 18, 24, 26 notch, 14 parallel 2 lines, 25, 27 switch, 31 reflector, 32 element antenna, 33 beam, 45 microstrip line, 46 through hole.

Claims (5)

A dielectric substrate;
In order to form a tapered slot line on the dielectric substrate, first and second opposingly provided on the dielectric substrate so as to maintain a symmetrical relationship with respect to the center line of the dielectric substrate. Conductors,
The region sandwiched between the first conductor and the second conductor is configured on the dielectric substrate, and the line width gradually increases while maintaining a symmetrical relationship with respect to the center line of the dielectric substrate, A taper slot line whose tip is an open end; and
An antenna device comprising: a feeding point provided at the other end of the tapered slot line; and feeding means for feeding power to the feeding point,
An antenna device, wherein a cut is provided in one of the first and second conductors constituting the tapered slot line. A dielectric substrate;
Parallel two lines composed of conductor lines arranged such that the line width is equal and the positions thereof overlap each other on the first surface of the dielectric substrate and the second surface opposite to the first surface When,
The end portions of the parallel two lines of the conductor lines on the first and second surfaces so as to gradually spread in the extending direction while maintaining a symmetric relationship with respect to the center line of the dielectric substrate. First and second conductors configured to extend while gradually changing the width;
A region sandwiched between the two parallel lines, the first conductor, and the second conductor is formed on the dielectric substrate, and the line width is symmetrical with respect to the center line of the dielectric substrate. A taper slot line that gradually expands and maintains an open end, and
An antenna device comprising: a feeding point provided at the other end of the tapered slot line; and feeding means for feeding power to the feeding point,
An antenna device, wherein a cut is provided in one of the first and second conductors constituting the tapered slot line.   The antenna apparatus according to claim 1, further comprising a switching unit that is provided for the cut and switches a short circuit / open state of the cut.   The antenna device according to any one of claims 1 to 3, wherein a plurality of the cuts are provided.   5. An antenna device comprising a plurality of antenna devices according to claim 1 as element antennas.

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