JP2013026828A - Glass antenna for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circular polarization antenna for a vehicle that can perform antenna tuning with excellent work efficiency when performing antenna tuning so that a desired antenna performance is obtained at a vehicle equipped with the circular polarization antenna for a vehicle receiving a circular polarization radio wave in a quasi-microwave band from a satellite.SOLUTION: A circular polarization antenna for a vehicle has a positive pole side element and a negative pole side element arranged on the same plane. The positive pole side element comprises at least a positive pole side feeding point, a positive pole side planar body on which the positive pole side feeding point is placed, and a positive pole side main wire connected to the positive pole side planar body. The negative pole side element comprises at least a negative pole side feeding point, a negative pole side planar body on which the negative pole side feeding point is placed, and a negative pole side main wire connected to the negative pole side planar body. An end of the positive pole side main wire and an end of the negative pole side main wire overlap and are capacitively coupled with each other.

Description

  The present invention is a circularly polarized antenna suitable for transmitting and receiving radio waves in the quasi-microwave band of 1 to 3 GHz disposed on a window glass of an automobile. For example, XM satellite radio and Sirius serviced in North America The present invention relates to a circularly polarized antenna for a vehicle that can be used for reception of satellite radio broadcasts such as satellite digital radio (SDARS) such as satellite radio and reception of radio waves from GPS (Global Positioning System) satellites.

  In SDARS (Satellite Digital Audio Service) and GPS (Global Positioning System) such as XM satellite radio and Sirius satellite radio that are serviced in North America, radio waves from satellites arrive in circular polarization, so the radio waves are efficiently transmitted. A circularly polarized antenna is used for reception.

  Conventionally, in order to receive radio waves from a satellite by a vehicle, a patch antenna is attached to the roof of the vehicle. When the patch antenna is mounted on the roof of the vehicle, the patch antenna can achieve good antenna performance, but when the patch antenna is mounted on the roof, the patch antenna becomes conspicuous, and the aesthetic appearance of the vehicle is impaired. It was thought.

  Therefore, as an antenna that does not stand out even if it is arranged in a vehicle, for example, an antenna that is used by attaching a transparent film on which an antenna is printed with a conductive paint as described in JP-A-2006-311497 to a window glass. (Patent Document 1) is proposed, or a method (Patent Document 2) in which a patch antenna as described in JP-A-2002-52957 is arranged in the vicinity of the receiver in the dashboard is proposed. doing.

JP 2006-311497 A JP 2002-52957 A

  In general, when an antenna is disposed on a window glass of a vehicle, not only when receiving a radio wave in a quasi-microwave band, but depending on the shape of the vehicle to which the antenna is attached and the position at which the antenna is attached, Is affected. Therefore, even if the antenna is arranged on a single glass plate and desired antenna performance is obtained, the desired antenna performance may not be obtained when the antenna is attached to the window glass of the vehicle. Therefore, in order to obtain the desired performance with the antenna, the antenna is actually formed using a conductive tape or the like, and the reception performance is measured while actually measuring the size and length of the antenna components. It is necessary to perform antenna tuning so that desired reception performance can be obtained when the antenna is attached to the vehicle by changing the interval or the like.

  The antenna described in Patent Document 1 realizes an antenna suitable for circular polarization by bringing a parasitic element close to a loop-shaped element. When tuning the antenna with this antenna attached to the vehicle, the size of the loop element, the length of the parasitic element, the interval between the loop element and the parasitic element, etc. can be adjusted. In order to change the size of the antenna, the loop-shaped element must be reattached every time tuning is performed, and the antenna tuning work cannot be performed efficiently.

  In addition, since the patch antenna mounting method described in Patent Document 2 is arranged in the dashboard, the patch antenna is attached to the roof because it is electromagnetically affected by metal parts around the patch antenna. There was a problem that good reception performance could not be obtained.

  The present invention seeks to solve these problems. That is, with respect to a circularly polarized antenna for a vehicle that receives a circularly polarized radio wave in a quasi-microwave band from a satellite, antenna tuning is performed so that a desired antenna performance is obtained in a vehicle equipped with the circularly polarized antenna. It is an object of the present invention to provide a circularly polarized antenna for a vehicle that can perform antenna tuning efficiently.

  The antenna of the present invention is a circularly polarized antenna for a vehicle in which a positive electrode side element and a negative electrode side element are arranged on the same plane. The positive electrode side element includes at least a positive electrode feeding point, a positive electrode side surface on which the positive electrode feeding point is placed, and a positive electrode main line connected to the positive electrode side surface, the negative electrode side The element includes at least a negative electrode side feeding point, a negative electrode side surface on which the negative electrode side feeding point is placed, and a negative electrode side main filament connected to the negative electrode side surface. And the front-end | tip part of the said positive electrode side main filament and the front-end | tip part of the said negative electrode side main filament are arrange | positioned with a clearance gap, and are capacitively coupled mutually.

  The antenna of the present invention may be provided with at least one auxiliary line for adjusting the axial ratio of the circularly polarized wave in either the positive electrode side element or the negative electrode side element.

  At least two auxiliary filaments are connected to the positive electrode side element, and two auxiliary filaments among the auxiliary filaments provided are the positive electrode side surface or the positive electrode main line. It is even better to extend the wire in a direction away from the negative electrode side element.

  Furthermore, the antenna of the present invention can be disposed on a vehicle glass. Or it can also print on a transparent film.

  The circularly polarized antenna for a vehicle for transmitting and receiving the quasi-microwave according to the present invention includes a length and size of each component of the antenna while the antenna is formed by a conductive tape and the sensitivity of the antenna is measured. Since it is easy to perform antenna tuning to find a configuration that can obtain the desired antenna sensitivity by changing the positional relationship, many antenna patterns can be obtained in a short time when the antenna is attached to the window glass of a vehicle. And can be adjusted so that a desired antenna sensitivity can be obtained quickly.

The front view when the glass-mounted antenna for vehicles concerning Example 1 is seen from the vehicle inner surface side. The front view when the glass-mounted antenna for vehicles concerning Example 2 is seen from the vehicle inner surface side. The front view when the glass-mounted antenna for vehicles concerning Example 3 is seen from the vehicle inner surface side. The front view when the glass-mounted antenna for vehicles concerning Example 4 is seen from the vehicle inner surface side. The front view when the glass-mounted antenna for vehicles concerning Example 5 is seen from the vehicle inner surface side. The front view when the glass-mounted antenna for vehicles concerning Example 6 is seen from the vehicle inner surface side. The front view when the glass-mounted antenna for vehicles concerning Example 7 is seen from the vehicle inner surface side. The front view when the glass-mounted antenna for vehicles concerning Example 8 is seen from the vehicle inner surface side. The front view when the glass-mounted antenna for vehicles concerning Example 9 is seen from the vehicle inner surface side. The front view when the glass-mounted antenna for vehicles concerning Example 10 is seen from the vehicle inner surface side. The front view when the glass-mounted antenna for vehicles concerning Example 11 is seen from the vehicle inner surface side. The front view when the glass-mounted antenna for vehicles concerning Example 12 is seen from the vehicle inner surface side. The front view when the glass-mounted antenna for vehicles concerning Example 13 is seen from the vehicle inner surface side. The axial ratio calculated | required by the simulation in the GPS zone | band of the glass antenna for vehicles of Example 1. FIG. The cross polarization discrimination degree calculated | required by the simulation in the GPS band of the glass antenna for vehicles of Example 1. FIG. The figure seen from the vehicle inner side when the glass antenna for vehicles of Example 1 is arrange | positioned in a windshield. Measurement result of antenna sensitivity for each elevation angle when the antenna to be measured is attached to the vehicle (solid line: glass antenna for vehicle of Example 1 arranged on windshield as shown in FIG. 16, broken line: patch mounted on dashboard antenna)

<Overall configuration of the present invention>
The antenna of the present invention has a configuration as shown in FIG. 1 when viewed from the vehicle inner surface side, and includes a positive electrode side element 10 and a negative electrode side element 20. The positive electrode side element includes a positive electrode side surface body 12, a positive electrode side feeding point 11 disposed on the positive electrode side surface body 12, and a positive electrode side main filament 13 extending from the positive electrode side surface body 12. At least. Further, the negative electrode side element includes a negative electrode side surface 22, a negative electrode side feeding point 21 disposed on the negative electrode side surface 22, and a negative electrode side main filament 23 extending from the negative electrode side surface 22. At least.

  The positive electrode side surface body 12 and the negative electrode side surface body 22 are arranged such that the edges facing each other are separated from each other by a distance f, and the positive electrode side main filament 13 and the negative electrode side main filament 23 are arranged. However, the circularly polarized wave is received by arranging the front end portion so as to overlap with a certain interval. Further, in FIG. 1, a plurality of auxiliary elements for adjusting the axial ratio of the antenna of the present invention so that the positive electrode side element 10 includes a positive electrode side first auxiliary wire 14 and a positive electrode side second auxiliary wire 15. A filament can be provided in the positive electrode side element or the negative electrode side element, or both the positive electrode side element and the negative electrode side element.

<Ease of antenna tuning of the antenna of the present invention>
The antenna of the present invention adjusts the length of the positive main line 13 in the positive element 10, the length of the negative main line 23 in the negative element 20, and the peripheral length of the negative side surface 22. Thus, the input impedance of the antenna of the present invention can be matched with the characteristic impedance of the coaxial line connected to the antenna of the present invention at a desired frequency.

  Moreover, the overlap length b of the location where the front-end | tip part of the positive electrode side main filament 13 and the front-end | tip part of the negative electrode side main filament 23 overlap, and the front-end | tip of the positive electrode side main filament 13 of the overlap location The phase of the current induced in the antenna of the present invention can be adjusted by adjusting the distance g between the first portion and the tip of the negative main wire 23, and the axial ratio of the antenna of the present invention can be adjusted. Can do. Since the overlap length b is greater than α · λ / 4 (α: wavelength reduction rate of the glass plate to which the antenna of the present invention is attached, λ: wavelength of the radio wave to be transmitted / received), the overlap length b cannot be obtained. It is better to adjust at / 4 or less. Moreover, since the capacitive coupling of the positive side main filament 13 and the negative side main filament 23 will become weak when the value of the space | interval g becomes larger than 10 mm, it is good to adjust it to 10 mm or less.

  Further, since the distance c from the edge of the negative electrode side surface at the overlapping portion affects the current distribution of current induced by receiving radio waves with the antenna of the present invention, the distance c is By adjusting, the current distribution in the antenna of the present invention is adjusted, and an optimum axial ratio can be obtained.

  When the antenna of the present invention is attached to the window glass of a vehicle, in addition to the direct wave from the transmission source, the reflected wave from the metal body around the window glass arrives at the antenna of the present invention. The reflected wave is usually different in direction and phase of arrival from the direct wave. For this reason, the current induced in the antenna of the present invention is a large antenna which is strengthened in some cases by overlapping the current induced in the antenna by the direct wave and the current induced in the antenna by the reflected wave. Sensitivity can be obtained, but in some cases it can be weakened and only a small antenna sensitivity can be obtained.

  Therefore, in the antenna of the present invention, with the antenna of the present invention attached to the window glass of a vehicle, the length of the positive main line 13, the length of the negative main line 23, A current induced in the antenna by the reflected wave and a current induced in the antenna by the direct wave by variously adjusting the overlap length b, the interval g, and the distance c of the wrapping portion Even if they overlap, it is possible to prevent the current from being weakened by the antenna, and it is possible to prevent a decrease in antenna sensitivity.

  When performing antenna tuning, the antenna of the present invention uses a conductive tape, and the conductive tape forms part or all of the antenna, and the positive main line 13 and the negative main line 13 Each time the length or arrangement is changed, the antenna sensitivity is measured to find the optimum arrangement of the respective filaments. In the antenna of the present invention, all the filaments provided in the positive electrode side element 10 and the negative electrode side element 20 are filaments whose one ends are open ends. For example, the wires constituting the antenna in advance are long. It is possible to easily perform antenna tuning such as attaching a strip to the window glass of the vehicle and changing the length of the strip to an optimum length. Therefore, during antenna tuning, it is possible to try many antenna configurations in a short time, and it is possible to quickly obtain an antenna configuration with good reception performance.

  Further, in the antenna of the present invention, a plurality of auxiliary adjustments for the axial ratio, such as the positive first auxiliary line 14 and the positive second auxiliary line 15 provided in the positive element 10 of FIG. It can be equipped with filaments. These auxiliary filaments serve to change the axial ratio of the antenna of the present invention by changing the phase of the current induced when the antenna of the present invention receives radio waves. By appropriately adjusting the phase of the current induced by the reflected wave incident from various directions by changing the number, the mounting position, and the length of the strip, it is possible to suppress the decrease in the antenna sensitivity of the present invention. It contributes.

  By providing such an auxiliary wire with the antenna of the present invention, it is possible to provide more parameters that can be changed than when performing antenna tuning using only the positive-side main wire 13 and the negative-side main wire 23. This makes it easier to obtain better antenna sensitivity.

<About shapes of positive electrode side surface and negative electrode side surface>
There is no problem as long as the size of the positive electrode side surface body 12 is larger than the size of the power supply portion of a power supply terminal (not shown) disposed at each power supply point. Further, the shape of the positive electrode side surface body 12 may be a square shape as shown in FIG. 1 if the size of the positive electrode side surface body 12 is about the size of the power supply portion of the power supply terminal. Whether it is a polygonal shape or a circular shape, it is not a big problem in obtaining good antenna performance.

  The size of the positive electrode side surface body 12 may be larger than the size of the power supply terminal. However, when the positive electrode side body 12 is enlarged, the horizontal and vertical widths of the positive electrode side body 12 are changed and the shape of the peripheral portion is changed in consideration of the current distribution in the positive electrode side body 12. It is necessary to perform such antenna tuning.

  Since the negative electrode side surface 22 functions also as a ground, it needs a certain size. Therefore, the current distribution in the negative electrode side surface 22 also greatly affects the antenna sensitivity of the antenna of the present invention. Usually, antenna tuning is performed by changing the attachment position and length of the positive main line 13, the negative main line 23, and the auxiliary line for ease of antenna tuning. The antenna tuning can be performed by changing the size of the body 22 or by changing the shape of the negative electrode side body 22 as shown in FIG. Since the current induced in the negative electrode side body 22 becomes stronger at the peripheral edge thereof, for example, changing the rectangular shape as shown in FIG. 1 to the polygonal shape as shown in FIG. 10 will greatly affect the antenna sensitivity. Can do. In the antenna of the present invention, the shape of the negative electrode side surface body 22 may be, for example, a circle other than the polygonal shape, or may be hollowed out in the vicinity of the center of the negative electrode side surface body. In view of the above, it is not preferable to use these shapes.

<Position of positive-side feeding point and negative-side feeding point>
The antenna of the present invention uses a coaxial line as a feed line for transmitting a signal received by the antenna to a receiver. A feeding terminal (not shown) is connected to the tip of the coaxial line, and the feeding terminal is soldered to the positive electrode feeding point 11 and the negative electrode feeding point 21 of the antenna. The coaxial wire is connected to the positive electrode side of the power supply terminal, and the outer conductor of the coaxial wire is connected to the negative electrode side of the power supply terminal.

  As the power feeding terminal, for example, one positive power feeding part and one negative power feeding part are provided so that one positive power feeding point 11 and one negative power feeding point 12 are arranged in series in FIG. In the configuration (a) in which the power feeding parts are arranged in series, or two negative power feeding points 12 are arranged on both sides of the positive power feeding point 11 as shown in FIG. There is a configuration (b).

  When the feeding terminal used in the antenna has the configuration of (a), since the positive side feeding part and the negative side feeding part are generally separated from each other, the negative side feeding point as shown in FIG. 11 is often disposed inside the negative electrode side surface.

  Further, when the power feeding terminal used in the antenna has the configuration of (b), the positive power feeding part of the power feeding terminal is sandwiched from both sides by two negative power feeding parts. The positive electrode side feeding point and the negative electrode side feeding point cannot be arranged apart from each other. For example, as shown in FIG. 13, the negative electrode side feeding point 21 faces the positive electrode side surface body 12 of the negative electrode side surface body 22. It will be arranged in the vicinity of the edge.

<About the positive side main filament and the negative side main filament>
The positive-side main filament 13 and the negative-side main filament 23 are disposed so as to overlap each other as shown in FIG. For example, in FIG. 1, the tip of the positive-side main filament 13 is disposed at a position farther from the side surface of the positive electrode than the tip of the negative-side main filament 23, but this need not be the case. As shown in FIG. 2, the tip end portion of the negative-side main filament 23 may be disposed at a position farther from the positive-electrode side surface than the positive-side main filament 13.

  The connection position of the positive side main filament 13 with respect to the positive electrode side surface 12 is such that, when the size of the positive electrode side surface 12 is small as shown in FIG. There is no big change. However, the connection position of the negative-side main filament 23 with respect to the negative electrode side surface 22 greatly affects the antenna sensitivity depending on the position. Therefore, the connection position of the negative main wire 23 to the negative electrode side member 22 may be the farthest corner from the positive electrode side member of the negative electrode side member 22 as shown in FIG. If present, as shown in FIG. 9, it is somewhere on one side of the negative electrode side surface facing the portion where the front end of the positive main line 13 and the front end of the negative main line 23 overlap. In some cases, as shown in FIG. 12, the negative electrode side surface 22 may be a corner portion of the side facing the positive electrode side surface 12.

  For example, as shown in FIG. 1, both the positive-side main filament 13 and the negative-side main filament 23 are usually extended in a direction away from the positive electrode side body 12 and the negative electrode side body 22, respectively, and bent in the middle at a right angle, In many cases, the positive-side main filament bending portion 13a and the negative-side main filament bending portion 23a are respectively configured. This is because in this way, when performing antenna tuning, it is easier to apply a conductive tape for constituting each of the filaments. Therefore, in order to increase the antenna sensitivity, it is not particularly necessary to bend each main filament at a right angle as shown in FIG. 1. For example, it may be bent gently as shown in FIG. If the time and effort are not taken into consideration, the main filaments may be formed by gently bending the main filaments such as an arc shape.

<When receiving radio waves with right circular polarization, when receiving radio waves with left circular polarization>
When the antenna of the present invention receives right circularly polarized radio waves coming from the outside of the vehicle, as shown by the arrow k in FIG. A path from the feeding point 11 through the positive-side main filament 13, through the overlap between the positive-side main filament 13 and the negative-side main filament 23, and to the negative-side main filament 23 and the negative-electrode side surface, The positive-side main filament 13 and the negative-side main filament 23 may be disposed so as to be clockwise.

  When receiving a left circularly polarized radio wave arriving from the outside of the vehicle, as shown by an arrow k in FIG. 11, when the antenna of the present invention is viewed from the vehicle inner surface side, A path that passes through the positive main line 13, passes through the overlap between the positive main line 13 and the negative main line 23, and reaches the negative main line 23 and the negative electrode side surface is counterclockwise. Thus, the positive side main filament 13 and the negative side main filament 23 may be disposed. In addition, even when the positive-side main filament 13 and the negative-side main filament 23 are provided as shown in FIG. 12, it is possible to receive right circularly polarized radio waves coming from the outside of the vehicle.

<About auxiliary filaments>
The auxiliary filament is an element that can be provided in the positive electrode side element 10 or the negative electrode side element 20, or can be provided in both the positive electrode side element 10 and the negative electrode side element 20, and is used for the current induced in the antenna of the present invention. The axial ratio of the antenna of the present invention can be adjusted by changing the phase.

  For example, even if there is only one auxiliary wire, it can function as a wire for adjusting the axial ratio of the antenna of the present invention, and can be connected to the positive electrode side body 12 as shown in FIG. As shown in FIG. 6, it can be connected to the positive main line. In addition, two auxiliary filaments may be provided, and in particular, the auxiliary filaments on the positive element 10 such as the positive first auxiliary filament 14 and the positive second auxiliary filament 15 as shown in FIG. Are connected to each other, and the auxiliary wire is disposed so as to extend away from the negative electrode side surface 22, so that the axial ratio of the antenna of the present invention is different from each of the two auxiliary wires. The antenna tuning can be performed more easily because it is greatly influenced by the length of each other and the mutual positional relationship.

  Further, three auxiliary wires may be connected to the positive element 10 as shown in FIG. Furthermore, the auxiliary filaments can be bent as shown in FIGS. Further, the auxiliary filaments can be connected to the negative electrode side element 20 as shown in FIGS.

<Regarding Method for Forming Antenna of the Present Invention>
The antenna of the present invention is formed of a conductive tape during antenna tuning. However, in the final verification of the antenna sensitivity, the antenna of the present invention can be printed using the same general conductive ceramic paste that forms the rear glass defogger, printed in the same way as the defogger, and baked in a furnace. Then, what is printed with a general conductive paint on a transparent film is attached to a window glass.

  Examples of the present invention will be described below.

<Example 1>
FIG. 1 is a front view of an antenna according to Embodiment 1 of the present invention when viewed from the vehicle inner surface side when the vehicle glass is disposed. The antenna according to the first embodiment includes a positive electrode side element 10 and a negative electrode side element 20.

  The positive electrode side element 10 includes a positive electrode side surface body 12, a positive electrode side feeding point 11 disposed on the positive electrode side surface body 12, a positive electrode side main filament 13 extending from the positive electrode side surface body 12, and a positive electrode side surface. The positive electrode side first auxiliary filament 14 extended from the rod-shaped body 12 and the positive electrode side second auxiliary filament 15 extended from the middle part of the positive electrode main line 13 are configured.

  The negative electrode side element 20 includes a negative electrode side surface body 22, a negative electrode side feeding point 21 disposed on the negative electrode side surface body 22, and a negative electrode side main filament 23 extending from the negative electrode side surface body 22. ing.

  The shape of the positive electrode side surface body 12 is square, and the shape of the negative electrode side surface body 22 is rectangular. Then, the positive electrode side surface body 12 and the negative electrode side surface body 22 are arranged on the glass surface at a distance f so as to be parallel to each other.

  The size of the positive electrode side surface body 12 only needs to be large enough to allow a power supply portion (not shown) on the core wire side of the power supply terminal to be completely placed. Moreover, since the negative electrode side surface body 22 will mount the electric power feeding part by the side of the outer conductor of the said electric power feeding terminal in the negative electrode side surface body 22, it is functioning also as a ground plane. For this reason, the negative electrode side surface 22 needs a certain size in order to stabilize the antenna performance. The position of the negative electrode side feeding point 21 where the feeding part on the outer conductor side of the feeding terminal is placed faces the negative electrode side surface body 22 of the positive electrode side surface body 12 from the positive electrode side feeding point 11. It comes to be on the virtual line a orthogonal to the side. Therefore, the distance m from the side of the negative electrode side surface 22 facing the positive electrode side surface 11 of the negative electrode side surface 22 is equal to the power supply portion on the core wire side of the power supply terminal used in the antenna of Example 1 and the outer skin. It is determined by the distance between the conductor-side power feeding portion and the distance f between the sides of the positive electrode side surface body 12 and the negative electrode side surface body 22 facing each other.

  The feeding terminal used in the antenna of Example 1 includes one core wire side feeding portion and one outer conductor side feeding portion. And the shape of each electric power feeding part is the same, and is an electroconductive square planar body.

  The negative main line 23 is connected to the corner of the negative electrode side surface 22 and extends so as to be orthogonal to a virtual line a passing through the positive electrode feeding point 11 and the negative electrode feeding point 21. It is bent at a right angle to form a negative-side main filament bent portion 23a.

  Moreover, the positive side main filament 13 is connected to the positive electrode side surface body 12, is extended in the same direction as the negative electrode side main filament, and the direction in which the negative electrode side main filament bent portion 23a is disposed in the middle. To be formed into a positive-side main filament bent portion 13a.

  The tip of the positive-side main filament bent portion 13a is disposed at a position farther from the negative electrode side surface body 22 than the negative-side main filament bent portion 23a, and the negative-side main filament bent portion 23a. The tip of the positive-side main wire bent portion 13a and the negative-side main wire bent portion 23a form an overlap portion.

  As indicated by the arrow k, the antenna of Example 1 passes from the positive-side feeding point 11 through the positive-side main wire 13 and passes through the positive-side main wire 13 when the antenna of this example is viewed from the vehicle inner surface side. Since the route that passes through the overlap portion between the bent portion 13a and the negative main wire bent portion 23a, passes through the negative main wire 23, and reaches the negative electrode side surface 22 is clockwise, it comes from the outside of the vehicle. Thus, the antenna can suitably receive the right circularly polarized radio wave.

  Moreover, the positive electrode side first auxiliary filament 14 is connected to the positive electrode side surface body 12 and extends straight in a direction away from the negative electrode side element 20, and the positive electrode side second auxiliary filament 15 is the positive electrode side main filament. 13 is connected to a bent point, and straightly extends in the same direction as the positive electrode side first auxiliary filament 14.

  In the state where the antenna of the present embodiment is disposed on the glass plate, a simulation was performed under the following conditions in order to find a condition suitable for reception at a frequency in the vicinity of a frequency of 1.57 GHz which is a GPS band.

  Calculation method: Finite element method.

Size of glass plate: 130 mm long × 130 mm wide 4 mm thick.

Specific permittivity of glass: 6.

The medium around the glass plate is air.

  When the antenna of this embodiment was attached to the glass plate, the antenna of this embodiment was made to look as shown in FIG.

  The antenna is disposed in this example so that the positive electrode feeding point 11 of the glass plate is at the center of the glass plate surface.

  As a result of this simulation, the optimum dimensions of the antenna of this example were as follows.

  Positive electrode side surface 12 = 10 mm × 10 mm.

Positive side main filament 13 = 50 mm.

Positive-side main filament bent part 13a = 20 mm.

Positive electrode side first auxiliary filament 14 = 20 mm.

Positive electrode side second auxiliary filament 15 = 40 mm.

The distance l between the positive electrode side first auxiliary filament 14 and the positive electrode side second auxiliary filament 15 is 30 mm.

The lateral dimension d of the negative electrode side surface 22 is 30 mm.

The vertical dimension e of the negative electrode side surface 22 is 20 mm.

Negative side main filament 23 = 50 mm.

Negative electrode side main filament bent portion 23a = 30 mm.

The distance f between the sides of the positive electrode side surface 12 and the negative electrode side surface facing each other is f = 5 mm.

Length b = 5 mm of the overlap portion between the positive-side main filament bent portion 13a and the negative-side main filament bent portion 23a.

The distance g between the positive-side main filament bent portion 13a and the negative-side main filament bent portion 23a is 5 mm.

The distance c = 20 mm between the negative electrode side main filament bent portion 23a and the side of the negative electrode side surface body 22 on the negative electrode side main filament bent portion side.

  The positive electrode feeding point 11 was disposed at the center of the positive electrode side surface.

  The distance m = 10 mm from the side of the negative electrode side feeding point 21 facing the positive electrode side surface 12 of the negative electrode side surface 22.

  The width of each filament = 0.7 mm.

  FIG. 14 shows the result of a simulation performed in accordance with the dimensions of the components of the antenna according to the present embodiment. FIG. 14 is a result of obtaining an axial ratio of circularly polarized waves transmitted and received in a direction perpendicular to the glass surface on the opposite side from the glass surface to which the antenna of the present example is attached with respect to a frequency around 1.57 GHz. is there. FIG. 15 shows the cross-polarization discrimination of the right circular polarization with respect to the left circular polarization transmitted and received in a direction perpendicular to the glass surface opposite to the glass surface on which the antenna of this embodiment is attached. It is the result calculated | required with respect to the frequency around 57 GHz.

  From FIG. 14 and FIG. 15, the axial ratio of the antenna of this embodiment and the cross discrimination degree of the right circular polarization with respect to the left circular polarization are the best values at 1.56 GHz. The axial ratio was a minimum value of 2.7 dB at 1.56 GHz, and the cross polarization discrimination of the right circular polarization with respect to the left circular polarization was 16.3 dB and the maximum value from FIG. These values are values that are comparable to the performance of patch antennas that are normally used for receiving circularly polarized waves.

  Thus, after simulating and determining the dimension of each component of the antenna of a present Example, the antenna of a present Example was affixed on the vehicle inner surface side of the vehicle windshield, and the measurement was performed.

  FIG. 16 shows the state of the antenna of the present embodiment when viewed from the vehicle inner surface side when the antenna of the present embodiment is disposed near the upper side of the windshield 30 and attached to the vehicle. The antenna of the example was arranged on the right side with respect to the center line h of the windshield 30 so that the positive electrode side element 10 was farther from the center line h than the negative electrode side element 20. The distance j between the flange peripheral edge 40 and the antenna of this embodiment was 30 mm, and the distance i from the center line h to the antenna of this embodiment was 100 mm. In FIG. 16, the dimensions of the constituent elements of the antenna of this example attached to the windshield were the same as the dimensions obtained from the simulation results.

  The antenna of the present embodiment is formed by printing on the inner surface side of the vehicle with a conductive ceramic paste so that the width of each filament is 0.7 mm, and after drying, baking it in a heating furnace. Thereafter, the core wire side power feeding part and the outer conductor side power feeding part of the power feeding terminal (not shown) were soldered to the positive electrode side feeding point 11 and the negative electrode side feeding point 21, respectively. Then, the windshield 30 is attached to the vehicle, the core wire side of the end of the coaxial cable extending from the tuner (not shown) is connected to the core wire side power feeding portion, and the outer conductor side power feeding portion at the front end of the coaxial cable is connected to the outer skin conductor side power feeding portion. Connected.

  FIG. 17 shows the average of the antenna sensitivity for the entire circumference of the antenna for 1.57 GHz radio waves for each elevation angle of the radio wave arrival direction when the antenna of this embodiment is arranged on the windshield 30 of the vehicle as shown in FIG. It is a figure showing a value (hereinafter referred to as antenna sensitivity). The solid line is a measurement result of the antenna sensitivity of the antenna of the present embodiment, and the broken line is a comparative example of the antenna of the present embodiment, and is for GPS disposed on the car navigation housing in the vehicle dashboard. It is a measurement result of the antenna sensitivity of a patch antenna. The arrangement of patch antennas shown in this comparative example is often used in general car navigation at present.

  From FIG. 17, the antenna sensitivity of the antenna of this example and the antenna sensitivity of the comparative example are almost the same in the range of the elevation angle from 0 degree to 60 degrees, and the antenna sensitivity of the antenna of this example is higher than the elevation angle of 60 degrees. The antenna sensitivity of the comparative example was greater than that of the comparative example, and good performance could be obtained without changing the dimensions of each component from the simulation results described above.

  Here, the dimensions of each component of the antenna of the present embodiment are the same as those obtained from the simulation results, but the antenna of the present embodiment obtained from the simulation results is made of a conductive material such as copper foil. The antenna sensitivity can be further improved by using antenna tape and performing antenna tuning.

<Example 2>
FIG. 2 is a front view of the antenna according to the second embodiment of the present invention when viewed from the vehicle inner surface side when the antenna is disposed on the vehicle glass. The antenna according to the second embodiment is such that the negative-side main line bending portion 23a is formed at a position farther from the negative electrode side surface body 22 than the positive-side main line bending portion 13a. In other respects, the configuration is the same.

  The antenna of the present example was simulated under the same conditions as in Example 1, and the dimensions of each component were determined so that radio waves around 1.57 GHz used in GPS could be received suitably. Then, the antenna of the present embodiment is formed with a conductive tape made of copper foil at the same position on the windshield as when the antenna of the first embodiment shown in FIG. 16 is formed on the windshield 30. The core wire side power feeding portion and the outer conductor side power feeding portion of the power feeding terminal (not shown) were soldered to the positive electrode side feeding point 11 and the negative electrode side feeding point 21, respectively. Then, the windshield is attached to the vehicle, the core wire side of the end of the coaxial cable extending from the tuner (not shown) is connected to the core wire side power supply section, and the outer conductor side power supply section of the front end of the coaxial cable is connected to the outer conductor side power supply Connected to the department.

  Then, while performing antenna tuning of the antenna of this embodiment while measuring the antenna sensitivity, the antenna tuning for changing the dimensions of each component of the antenna of this embodiment and the positional relationship between the components was performed. Similarly, good antenna sensitivity could be obtained for right circularly polarized radio waves coming from the outside of the vehicle in the GPS band.

<Example 3>
FIG. 3 is a front view of the antenna according to the third embodiment of the present invention when viewed from the vehicle inner surface side when the vehicle glass is disposed. In the antenna of Example 3, the positive electrode side first auxiliary wire 14 is bent at a right angle in the middle, and the tip of the negative electrode side first auxiliary wire 24 is located at the bent position of the negative electrode side main wire 23. The embodiment is that the negative-side first auxiliary wire 24 is bent in the middle so that the positive-side main wire-folded portion 13a is sandwiched together with the negative-side main-wire-folded portion 23a. This is different from the antenna 1 and has the same configuration in other points.

  The antenna of the present example was simulated under the same conditions as in Example 1, and the dimensions of each component were determined so that radio waves around 1.57 GHz used in GPS could be received suitably. Then, the antenna of this example is formed with a conductive tape made of copper foil at the same position on the windshield as when the antenna of Example 1 shown in FIG. 16 was formed on the windshield, The core wire side power supply portion and the outer conductor side power supply portion of the power supply terminal (not shown) were soldered to the positive electrode side power supply point 11 and the negative electrode side power supply point 21, respectively. Then, the windshield is attached to the vehicle, the core wire side of the end of the coaxial cable extending from the tuner (not shown) is connected to the core wire side power supply section, and the outer conductor side power supply section of the front end of the coaxial cable is connected to the outer conductor side power supply Connected to the department.

  Then, while performing antenna tuning of the antenna of this embodiment while measuring the antenna sensitivity, the antenna tuning for changing the dimensions of each component of the antenna of this embodiment and the positional relationship between the components was performed. Similarly, good antenna sensitivity could be obtained for right circularly polarized radio waves coming from the outside of the vehicle in the GPS band.

<Example 4>
FIG. 4 is a front view of the antenna according to the fourth embodiment of the present invention when viewed from the vehicle inner surface side when the vehicle glass is disposed. The antenna of Example 4 is different from the antenna of Example 1 in that the positive electrode side third auxiliary filament 16 is added, and has the same configuration in other points.

  The antenna of the present example was simulated under the same conditions as in Example 1, and the dimensions of each component were determined so that radio waves around 1.57 GHz used in GPS could be received suitably. Then, the antenna of this example is formed with a conductive tape made of copper foil at the same position on the windshield as when the antenna of Example 1 shown in FIG. 16 was formed on the windshield, The core wire side power supply portion and the outer conductor side power supply portion of the power supply terminal (not shown) were soldered to the positive electrode side power supply point 11 and the negative electrode side power supply point 21, respectively. Then, the windshield is attached to the vehicle, the core wire side of the end of the coaxial cable extending from the tuner (not shown) is connected to the core wire side power supply section, and the outer conductor side power supply section of the front end of the coaxial cable is connected to the outer conductor side power supply Connected to the department.

  Then, while performing antenna tuning of the antenna of this embodiment while measuring the antenna sensitivity, the antenna tuning for changing the dimensions of each component of the antenna of this embodiment and the positional relationship between the components was performed. Similarly, good antenna sensitivity could be obtained for right circularly polarized radio waves coming from the outside of the vehicle in the GPS band.

<Example 5>
FIG. 5 is a front view of the antenna according to the fifth embodiment of the present invention when viewed from the vehicle inner surface side when the vehicle glass is disposed. The antenna of the fifth embodiment is different from the antenna of the first embodiment in that the second auxiliary filament 15 on the positive electrode side is not present, and has the same configuration in other respects.

  The antenna of the present example was simulated under the same conditions as in Example 1, and the dimensions of each component were determined so that radio waves around 1.57 GHz used in GPS could be received suitably. Then, the antenna of this example is formed with a conductive tape made of copper foil at the same position on the windshield as when the antenna of Example 1 shown in FIG. 16 was formed on the windshield, The core wire side power supply portion and the outer conductor side power supply portion of the power supply terminal (not shown) were soldered to the positive electrode side power supply point 11 and the negative electrode side power supply point 21, respectively. Then, the windshield is attached to the vehicle, the core wire side of the end of the coaxial cable extending from the tuner (not shown) is connected to the core wire side power supply section, and the outer conductor side power supply section of the front end of the coaxial cable is connected to the outer conductor side power supply Connected to the department.

  Then, while performing antenna tuning of the antenna of this embodiment while measuring the antenna sensitivity, the antenna tuning for changing the dimensions of each component of the antenna of this embodiment and the positional relationship between the components was performed. Similarly, good antenna sensitivity could be obtained for right circularly polarized radio waves coming from the outside of the vehicle in the GPS band.

<Example 6>
FIG. 6 is a front view of the antenna according to the sixth embodiment of the present invention when viewed from the vehicle inner surface side when the antenna is disposed on the vehicle glass. The antenna of the sixth embodiment is different from the antenna of the fifth embodiment in that the positive-side first auxiliary filament 14 is connected to the positive-side main filament instead of the positive-electrode side surface. This is the same configuration.

  The antenna of the present example was simulated under the same conditions as in Example 1, and the dimensions of each component were determined so that radio waves around 1.57 GHz used in GPS could be received suitably. Then, the antenna of this example is formed with a conductive tape made of copper foil at the same position on the windshield as when the antenna of Example 1 shown in FIG. 16 was formed on the windshield, The core wire side power supply portion and the outer conductor side power supply portion of the power supply terminal (not shown) were soldered to the positive electrode side power supply point 11 and the negative electrode side power supply point 21, respectively. Then, the windshield is attached to the vehicle, the core wire side of the end of the coaxial cable extending from the tuner (not shown) is connected to the core wire side power supply section, and the outer conductor side power supply section of the front end of the coaxial cable is connected to the outer conductor side power supply Connected to the department.

  Then, while performing antenna tuning of the antenna of this embodiment while measuring the antenna sensitivity, the antenna tuning for changing the dimensions of each component of the antenna of this embodiment and the positional relationship between the components was performed. Similarly, good antenna sensitivity could be obtained for right circularly polarized radio waves coming from the outside of the vehicle in the GPS band.

<Example 7>
FIG. 7 is a front view of the antenna according to the seventh embodiment of the present invention when viewed from the vehicle inner surface side when the vehicle glass is disposed. The antenna of Example 7 is different from Example 5 in that there is no auxiliary filament, and has the same configuration in other points.

  The antenna of the present example was simulated under the same conditions as in Example 1, and the dimensions of each component were determined so that radio waves around 1.57 GHz used in GPS could be received suitably. Then, the antenna of this example is formed with a conductive tape made of copper foil at the same position on the windshield as when the antenna of Example 1 shown in FIG. 16 was formed on the windshield, The core wire side power supply portion and the outer conductor side power supply portion of the power supply terminal (not shown) were soldered to the positive electrode side power supply point 11 and the negative electrode side power supply point 21, respectively. Then, the windshield is attached to the vehicle, the core wire side of the end of the coaxial cable extending from the tuner (not shown) is connected to the core wire side power supply section, and the outer conductor side power supply section of the front end of the coaxial cable is connected to the outer conductor side power supply Connected to the department.

  Then, while performing antenna tuning of the antenna of this embodiment while measuring the antenna sensitivity, the antenna tuning for changing the dimensions of each component of the antenna of this embodiment and the positional relationship between the components was performed. Similarly, good antenna sensitivity could be obtained for right circularly polarized radio waves coming from the outside of the vehicle in the GPS band.

<Example 8>
FIG. 8 is a front view of the antenna according to the eighth embodiment of the present invention when viewed from the vehicle inner surface side when disposed on the vehicle glass. In the antenna of Example 8, the negative electrode side first auxiliary filament 24 is connected to the corner portion of the negative electrode side surface body 22 to which the negative electrode side main filament 23 is connected, and the antenna is extended away from the positive electrode side surface body 12. The negative electrode side second auxiliary filament 25 is connected to the bent point of the negative electrode main filament 23 and is extended away from the positive electrode side surface 12. Are different and are otherwise identical in construction.

  The antenna of the present example was simulated under the same conditions as in Example 1, and the dimensions of each component were determined so that radio waves around 1.57 GHz used in GPS could be received suitably. Then, the antenna of this example is formed with a conductive tape made of copper foil at the same position on the windshield as when the antenna of Example 1 shown in FIG. 16 was formed on the windshield, The core wire side power supply portion and the outer conductor side power supply portion of the power supply terminal (not shown) were soldered to the positive electrode side power supply point 11 and the negative electrode side power supply point 21, respectively. Then, the windshield is attached to the vehicle, the core wire side of the end of the coaxial cable extending from the tuner (not shown) is connected to the core wire side power supply section, and the outer conductor side power supply section of the front end of the coaxial cable is connected to the outer conductor side power supply Connected to the department.

  Then, while performing antenna tuning of the antenna of this embodiment while measuring the antenna sensitivity, the antenna tuning for changing the dimensions of each component of the antenna of this embodiment and the positional relationship between the components was performed. Similarly, good antenna sensitivity could be obtained for right circularly polarized radio waves coming from the outside of the vehicle in the GPS band.

<Example 9>
FIG. 9: is a front view when the antenna concerning Example 9 of this invention is seen from the vehicle inner surface side when arrange | positioned on the glass for vehicles. In the antenna of Example 9, the connection position of the negative-side main filament 23 to the negative-electrode side-shaped body is set so that the negative-side main-line bent portion 23 a and the positive-side main filament are out of the sides of the negative-electrode side-shaped body 22. The antenna is different from the antenna of the first embodiment in that it is provided at an arbitrary position on the side where the overlapping portion with the bent portion 13a is present, and the other configuration is the same.

  The antenna of the present example was simulated under the same conditions as in Example 1, and the dimensions of each component were determined so that radio waves around 1.57 GHz used in GPS could be received suitably. Then, the antenna of this example is formed with a conductive tape made of copper foil at the same position on the windshield as when the antenna of Example 1 shown in FIG. 16 was formed on the windshield, The core wire side power supply portion and the outer conductor side power supply portion of the power supply terminal (not shown) were soldered to the positive electrode side power supply point 11 and the negative electrode side power supply point 21, respectively. Then, the windshield is attached to the vehicle, the core wire side of the end of the coaxial cable extending from the tuner (not shown) is connected to the core wire side power supply section, and the outer conductor side power supply section of the front end of the coaxial cable is connected to the outer conductor side power supply Connected to the department.

  Then, while performing antenna tuning of the antenna of this embodiment while measuring the antenna sensitivity, the antenna tuning for changing the dimensions of each component of the antenna of this embodiment and the positional relationship between the components was performed. Similarly, good antenna sensitivity could be obtained for right circularly polarized radio waves coming from the outside of the vehicle in the GPS band.

<Example 10>
FIG. 10 is a front view of the antenna according to the tenth embodiment of the present invention when viewed from the vehicle inner surface side when disposed on the vehicle glass. In the antenna of Example 10, the negative electrode side surface 22 has a polygonal shape, and both the positive electrode side main wire 13 and the negative electrode side main wire 23 are connected to the positive electrode side surface 12 and the negative electrode side surface. The antenna 22 is different from the antenna of the first embodiment in that it extends obliquely from the phantom line a with respect to the imaginary line a, and the other configurations are the same.

  The antenna of the present example was simulated under the same conditions as in Example 1, and the dimensions of each component were determined so that radio waves around 1.57 GHz used in GPS could be received suitably. Then, the antenna of this example is formed with a conductive tape made of copper foil at the same position on the windshield as when the antenna of Example 1 shown in FIG. 16 was formed on the windshield, The core wire side power supply portion and the outer conductor side power supply portion of the power supply terminal (not shown) were soldered to the positive electrode side power supply point 11 and the negative electrode side power supply point 21, respectively. Then, the windshield is attached to the vehicle, the core wire side of the end of the coaxial cable extending from the tuner (not shown) is connected to the core wire side power supply section, and the outer conductor side power supply section of the front end of the coaxial cable is connected to the outer conductor side power supply Connected to the department.

  Then, while performing antenna tuning of the antenna of this embodiment while measuring the antenna sensitivity, the antenna tuning for changing the dimensions of each component of the antenna of this embodiment and the positional relationship between the components was performed. Similarly, good antenna sensitivity could be obtained for right circularly polarized radio waves coming from the outside of the vehicle in the GPS band.

<Example 11>
FIG. 11: is a front view when the antenna concerning Example 11 of this invention is seen from the vehicle inner surface side when arrange | positioned on the glass for vehicles. The antenna of Example 11 is an antenna arranged on the glass so that the positional relationship of each component is axisymmetric with respect to the virtual line a. In the antenna of the present embodiment, the positive electrode side feed line 11 passes through the positive electrode main line 13 and passes through the overlap between the positive electrode main line bent part 13a and the negative electrode main line bent part 23a. Unlike the embodiment, the path that passes through the side main filament 23 and reaches the negative electrode side surface 22 is counterclockwise unlike the embodiment, so that the left circularly polarized radio wave coming from the outside of the vehicle is On the other hand, the antenna exhibits good performance.

  The antenna of the present example was simulated under the same conditions as in Example 1, and the dimensions of each component were determined so that radio waves around 1.57 GHz used in GPS could be received suitably. Then, the antenna of this example is formed with a conductive tape made of copper foil at the same position on the windshield as when the antenna of Example 1 shown in FIG. 16 was formed on the windshield, The core wire side power supply portion and the outer conductor side power supply portion of the power supply terminal (not shown) were soldered to the positive electrode side power supply point 11 and the negative electrode side power supply point 21, respectively. Then, the windshield is attached to the vehicle, the core wire side of the end of the coaxial cable extending from the tuner (not shown) is connected to the core wire side power supply section, and the outer conductor side power supply section of the front end of the coaxial cable is connected to the outer conductor side power supply Connected to the department.

  Then, while measuring the antenna sensitivity of the antenna of this embodiment, antenna tuning was performed to change the dimensions of each component of the antenna of this embodiment and the positional relationship between the components. Good antenna sensitivity was obtained for the left-circularly polarized radio wave coming from.

<Example 12>
FIG. 12 is a front view of the antenna according to the twelfth embodiment of the present invention when viewed from the vehicle inner surface side when the antenna is disposed on the vehicle glass. In the antenna of Example 12, both the positive-side main filament 13 and the negative-side main filament 23 are connected to the imaginary line a from the positive-electrode side surface body 12 and the negative-electrode side surface body 22 to which the respective wires are connected. Although it differs from the antenna of Example 11 by extending so that it may become parallel, it is the same structure in another point. In the antenna of this example, like the antenna of Example 12, the positive side main wire 13 passes through the positive side main wire 13 from the positive side feeding point 11, and the positive side main wire bent portion 13a and the negative side main wire bent portion 23a. Unlike the embodiment, the route from the main body 23 through the negative electrode main line 23 to the negative electrode side surface 22 is counterclockwise as shown by the arrow k ′, and thus comes from the outside of the vehicle. It is an antenna that exhibits good performance for left-circularly polarized radio waves.

  The antenna of the present example was simulated under the same conditions as in Example 1, and the dimensions of each component were determined so that radio waves around 1.57 GHz used in GPS could be received suitably. Then, the antenna of this example is formed with a conductive tape made of copper foil at the same position on the windshield as when the antenna of Example 1 shown in FIG. 16 was formed on the windshield, The core wire side power supply portion and the outer conductor side power supply portion of the power supply terminal (not shown) were soldered to the positive electrode side power supply point 11 and the negative electrode side power supply point 21, respectively. Then, the windshield is attached to the vehicle, the core wire side of the end of the coaxial cable extending from the tuner (not shown) is connected to the core wire side power supply section, and the outer conductor side power supply section of the front end of the coaxial cable is connected to the outer conductor side power supply Connected to the department.

  Then, while measuring the antenna sensitivity of the antenna of this embodiment, antenna tuning was performed to change the dimensions of each component of the antenna of this embodiment and the positional relationship between the components. Good antenna sensitivity was obtained for the left-circularly polarized radio wave coming from.

<Example 13>
FIG. 13: is a front view when the antenna concerning Example 13 of this invention is seen from the vehicle inner surface side when arrange | positioned on the glass for vehicles. In the antenna of the thirteenth embodiment, there are two negative-side feeding points 21 so as to sandwich the virtual line a, and a feeding terminal (not shown) is composed of one core-side feeding unit and two outer conductor-side feeding units. The point that the core wire side power feeding part is sandwiched between the two outer conductor side power feeding parts is different from the antenna of the first embodiment, and other points are the same as in the embodiment. 1 has the same configuration.

  The antenna of the present example was simulated under the same conditions as in Example 1, and the dimensions of each component were determined so that radio waves around 1.57 GHz used in GPS could be received suitably. Then, the antenna of this example is formed with a conductive tape made of copper foil at the same position on the windshield as when the antenna of Example 1 shown in FIG. 16 was formed on the windshield, The core wire side power supply portion and the outer conductor side power supply portion of the power supply terminal (not shown) were soldered to the positive electrode side power supply point 11 and the negative electrode side power supply point 21, respectively. Then, the windshield is attached to the vehicle, the core wire side of the end of the coaxial cable extending from the tuner (not shown) is connected to the core wire side power supply section, and the outer conductor side power supply section of the front end of the coaxial cable is connected to the outer conductor side power supply Connected to the department.

  Then, the antenna sensitivity was measured and the antenna tuning was performed while changing the dimensions of the components of the antenna of this example and the positional relationship between the components. As with the antenna of Example 1, the GPS band was measured. The antenna sensitivity was good for left circularly polarized radio waves coming from outside the car.

  The antennas of the embodiments described above are antennas that have been tuned so that suitable antenna sensitivity can be obtained in the GPS band, but not limited to the GPS band, for example, a quasi-microwave band of 1 GHz to 3 GHz, for example, It goes without saying that the dimensions of each component of the antenna of the present invention and the positional relationship between the components can be adjusted so as to be used as an SDARS antenna such as an XM satellite radio or Sirius satellite radio using the 2.3 GHz band.

  Although the preferred embodiment has been described above, the present invention is not limited to this, and various applications can be considered.

DESCRIPTION OF SYMBOLS 10 Positive electrode side element 11 Positive electrode side feeding point 12 Positive electrode side surface body 13 Positive electrode side main filament 13a Positive electrode side main filament bending part 14 Positive electrode side 1st auxiliary filament 15 Positive electrode side 2nd auxiliary filament 16 Positive electrode side 3rd Auxiliary wire 20 Negative electrode side element 21 Negative electrode side feeding point 22 Negative electrode side surface 23 Negative electrode side main wire 23a Negative electrode side main wire bent portion 24 Negative electrode side first auxiliary wire 25 Negative electrode side second auxiliary wire 30 Front Glass 40 Flange peripheral edge a Virtual line b passing through the positive electrode side feeding point and orthogonal to the side facing the positive electrode side surface of the negative electrode side surface body Overlap length c between the positive side main line and the negative side main line c Positive electrode The distance between the overlap between the side main wire and the negative side main wire to the negative electrode side surface d Negative electrode side surface horizontal dimension e Negative electrode side surface vertical dimension f Positive electrode side surface edge and negative electrode side object side Distance between edges g Distance h at the overlap between the main wire and the negative main wire h Centerline i of the windshield i Distance between the centerline of the windshield and the antenna of the first embodiment j Between the peripheral edge of the flange and the antenna of the first embodiment Interval k Clockwise arrow as seen from the inside of the car k 'Counterclockwise arrow as seen from the inside of the car

Claims (5)

In the vehicle circularly polarized wave antenna in which the positive electrode side element (10) and the negative electrode side element (20) are arranged on the same plane,
The positive electrode side element (10) is connected to at least a positive electrode feeding point (11), a positive electrode side surface (12) on which the positive electrode feeding point (11) is placed, and the positive electrode side surface. A positive main wire (13),
The negative electrode side element (20) includes at least a negative electrode side feeding point (21), a negative electrode side surface (22) on which the negative electrode side feeding point (21) is placed, and the negative electrode side surface (22). A negative-side main wire (23) to be connected;
A vehicle circle characterized in that the tip of the positive-side main filament (13) and the tip of the negative-side main filament (23) overlap each other with a gap therebetween and are capacitively coupled to each other. Polarized antenna.   Any one of the positive electrode side element (10) and the negative electrode side element (20) is provided with at least one auxiliary filament (14, 15, 24, 25) for adjusting the axial ratio of the circularly polarized wave. The vehicle circularly polarized wave antenna according to claim 1.   The positive electrode side element (10) is provided with at least two auxiliary filaments, and two auxiliary filaments (14, 15) of the auxiliary filaments provided are the positive electrode side surface or 3. The vehicular circularly polarized wave antenna according to claim 1, wherein the vehicular circularly polarized wave antenna is connected to the positive side main wire and extends in a direction away from the negative side element.   The glass for vehicles by which the circularly polarized wave antenna for vehicles as described in any one of Claims 1 thru | or 3 was arrange | positioned. A transparent film on which the vehicle circularly polarized antenna according to any one of claims 1 to 4 is printed.

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