JP2003069328A - Window glass antenna for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a window glass antenna for automobiles that obtains sufficient sensitivity for FM broadcasting or the like with enhanced directivity. SOLUTION: The antenna is configured such that a distance between the center of a feeding point 6L of a first antenna conductor 4L and the left side of a rear window glass pane 1 is selected to b 30 to 300 mm, a distance between the center of the feeding point 6L and the upper side of the rear window glass pane 1 is selected within 100 mm, a distance between the center of a feeding point 6R of a second antenna conductor 4R and the right side of the rear window glass pane 1 is selected to be within 30 to 300 mm, a distance between the center of the feeding point 6R and the upper side of the rear window glass pane 1 is selected within 100 mm, and a distance between the center of the feeding point 6L and the center of the feeding point 6R is selected to be 300 mm or more.

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] The present invention relates to a Japanese radio FM.
Broadcast band (76-90 MHz), US radio FM broadcast band
Automotive window glass suitable for (88-108 MHz) reception
Related to antennas. Hereafter, the Japanese radio FM broadcasting band
And the US radio FM broadcast band are simply called FM broadcast bands. [0002] [0002] AM broadcasting band (530 to 1605 kHz)
As a window glass antenna for both reception and FM broadcast band reception
Conventionally, as shown in FIG.
1 for FM broadcast antenna conductor 4_U4_DAnd for AM broadcasting
What was provided with the antenna conductor 5 was used.
However, in this conventional example, the sensitivity of FM broadcast is not sufficient.
There was a problem that was not directivity. In FIG. 5, reference numeral 1 denotes a rear window of an automobile.
Glass plate, 2 is heater wire, 7_U, 7 _DIs the preamplifier, 1
0 is a DC power supply, 11 is a capacitor, 16_UFor FM broadcast
Antenna conductor 4_U16 feeding points_DIs for FM broadcasting
N conductor 4_DThe feeding point 20 is a receiver. [0004] The present invention is based on the prior art.
Automotive window glass antenna that eliminates the aforementioned drawbacks
The purpose is to provide. [0005] The present invention provides a first antenna.
Supply of conductor, second antenna conductor, first antenna conductor
The power point and the feeding point of the second antenna conductor is the rear window of the car
To the window glass antenna for automobiles provided on the glass plate
The center of the feeding point of the first antenna conductor and the rear window
The distance from the left side of the lath plate is 30 to 300 mm,
The center of the feeding point of the first antenna conductor and the rear window glass
The distance from the top side of the plate is within 100 mm, and the second
Distance between the center of the feeding point of the tena conductor and the right side of the rear window glass plate
The separation is 30 to 300 mm and the second antenna guide
The distance between the center of the body feeding point and the upper side of the rear window glass plate is 1
Within 00 mm, and the supply of the first antenna conductor
The distance between the center of the electrical point and the center of the feed point of the second antenna conductor
An automobile characterized by being separated by 300 mm or more
A window glass antenna is provided. [0006] DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings.
Explained. FIG. 1 shows an automotive glass antenna device according to the present invention.
It is a block diagram of one Example of a device. In FIG. 1, 1 is automatic
Car rear window glass plate, 2 heater wire, 3 defogger,
4_LIs the first antenna placed on the left side of the rear window glass plate 1
N conductor 4_RIs the second arranged on the right side of the rear window glass plate 1
Antenna conductor 5 for AM broadcasting antenna conductor 5_SIs
Feed point for antenna conductor for AM broadcasting, 7_LIs the first An
Tena conductor 4_LAnd AM broadcasting antenna conductor 5
Antenna peripheral circuit, 7_RIs the second antenna conductor 4_RFor
Antenna peripheral circuit, 6_LIs the antenna conductor 4_LFeeding point, 6
_RIs the antenna conductor 4_RFeeding point 10 is a DC power source 11
Is a capacitor, and 20 is a receiver. The AM broadcast antenna conductor 5 is a rear window glass.
It is arranged near the upper side of the plate 1 and the rear window glass plate 1
When viewed from the center, the direction of the AM broadcast antenna conductor 5 is upward.
is there. As shown in FIG.
Electric heating type defogger 3, AM broadcasting antenna conductor 5,
First antenna conductor 4_L, Second antenna conductor 4_R, Salary
Electric point 5_S, Feeding point 6_LAnd feeding point 6_RThere is a rear window glass plate
1 is provided. First antenna conductor 4_LAnd second
Antenna conductor 4_RIs the default of the rear window glass plate 1
Arranged above the area 3. In FIG. 1, the first antenna conductor 4_LIs feeding
Point 6_LAfter extending downward, bend and rear window glass plate
1 is extended toward the left and right center. I.e.
1 antenna conductor 4_LIs feeding point 6_LMore rear window glass plate
It has a part that extends toward the left and right center of 1
The In FIG. 1, the second antenna conductor 4_RIs feeding
Point 6_RAfter extending downward, bend and rear window glass plate
1 is extended toward the left and right center. I.e.
Two antenna conductors 4_RIs feeding point 6_RMore rear window glass plate
It has a portion that extends toward the left and right center of 1
The First antenna conductor 4_LReceived signal excited to
No. is feeding point 6_LAntenna peripheral circuit 7_LAnd cable
To the receiver 20. Second antenna conductor 4
_RThe received signal excited to the feed point 6_R, Around the antenna
Road 7_RAnd sent to the receiver 20 via a cable. A
The reception signal excited to the M broadcasting antenna conductor 5 is a feeding point.
5_SAntenna peripheral circuit 7_LAnd receive via cable
Sent to machine 20. The defogger 3 has a DC power supply 10
A direct current is applied. FIG. 2 shows a rear window glass plate 1 according to the present invention.
The hatched portion shown in FIG.
Point 6_L, Feeding point 6_RRear window glass plate that is arranged respectively
1 region is shown. In FIG. 2, a guide other than the defogger 3 is used.
The body part is omitted. In the present invention, the feeding point 6_LCenter and rear
Distance with left side of window glass plate 1 (D_{L 1}~ D_L2) Is 30
~ 300mm and feeding point 6_LCenter and rear window
Distance H from top side of glass plate 1_LIs within 100mm
The In addition, feeding point 6_RCenter and the right side of the rear window glass plate 1
Distance to (D_R1~ D_R2) Is 30-300mm
And feeding point 6_RCenter and upper side of rear window glass plate 1
Distance H_RIs within 100 mm. In addition, the feeding point
6_LCenter and feed point 6_RDistance D from the center of_cIs 300m
m or more. Feed point 6_LCenter and feed point 6_RThe center of
If each is located in the shaded area above,
1 antenna conductor 4_LDirectivity and second antenna conductor 4
_RThe difference from the directivity of is remarkable and preferable. In the present invention
Is the feeding point 6_LAnd feeding point 6_RStrong signal out of the received signal
Diversity reception that selects the signal is preferred.
Yes. This is because it can approach omnidirectionality. Antenna peripheral circuit 7_L, 7_RAs before
Preamplifier circuit, impedance matching circuit, resonance circuit
Etc., and are not particularly limited. For AM broadcasting
The antenna conductor 5 is provided as necessary,
AM broadcasting antenna conductor 5 may be used for other broadcasting bands
Yes. In the present invention, the first antenna conductor 4_L
And second antenna conductor 4_RAnd with FM broadcasts,
Instead of FM broadcasting, TV VHF band (90-108
MHz, 170-222 MHz), TV UHF band (4
70 to 770 MHz), TV VHF band in North America and Europe
(45-86 MHz, 175-225 MHz), automobile
800MHz band for telephone (810-960MHz), self
1.5 GHz band (1.429 to 1.501) for car phone
GHz), UHF band (300MHz to 3GHz), etc.
You may believe. [0017] DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described in detail below with reference to the drawings.
Light up. "Example 1 (Example)" Rear window glass of an automobile
A window glass antenna for automobiles as shown in FIG.
I made na. The dimensions of each part are as follows. FM
FIG. 3 shows frequency-sensitivity characteristics in the broadcast band. Also,
When the direction of the electric field of the incoming radio wave is inclined 45 degrees with respect to the ground
Directivity characteristics of the finger when receiving at 88 MHz
The direction characteristics are shown in FIG. In FIG. 4, the 0 ° direction is the direction of the car
It is the front and the 90 ° direction is to the left of the car. Of FIG.
The same applies to the directivity diagram. 3 and 4,
The solid line is the first antenna conductor 4_LThe broken line is the number
Two antenna conductors 4_RIt is a characteristic. Feeding point 6_LThe distance between the center of and the left side of the rear window glass plate 1 is 100 mm, Feeding point 6_LThe distance H between the center of the window and the upper side of the rear window glass plate 1_L        30mm, Feeding point 6_RThe distance between the center of and the right side of the rear window glass plate 1 is 100 mm, Feeding point 6_RThe distance H between the center of the window and the upper side of the rear window glass plate 1_R        30mm, Feeding point 6_LCenter and feed point 6_RDistance D from the center of_c            800 mm. "Example 2 (comparative example)" Rear window glass of an automobile
A window glass antenna for automobiles as shown in FIG.
I made na. Feeding point 16_uCenter and feed point 16_Din
Distance D with heart_cWas 500 mm. Figure shows frequency-sensitivity characteristics in the FM broadcast band.
It is shown in FIG. The direction of the electric field of the incoming radio wave is
This is the directivity when tilted 45 degrees.
The directivity characteristics during reception are shown in the figure. 6 and 7
The solid line indicates the FM broadcast antenna conductor 4._UIs the characteristic of
The broken line indicates the FM broadcast antenna conductor 4_DIt is a characteristic. [0021] In the present invention, the first antenna conductor is fed.
The distance between the center of the point and the center of the feed point of the second antenna conductor
Is sufficiently separated in the left-right direction, so the sensitivity of FM broadcasting etc.
Sufficiently obtained and improved directivity.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of an embodiment of an automotive window glass antenna of the present invention. Figure 2 is a plan view showing a region of the rear window glass sheet 1 which the feeding point 6 _L feeding point 6R is disposed. 3 is a frequency-sensitivity characteristic diagram in the FM broadcast band of Example 1. FIG. 4 is a directional characteristic diagram at the time of reception at 88 MHz in Example 1. FIG. FIG. 5 is a configuration diagram of a conventional automobile window glass antenna. 6 is a frequency-sensitivity characteristic diagram in the FM broadcast band of Example 2. FIG. 7 is a directional characteristic diagram at the time of reception at 88 MHz in Example 2. FIG. [Description of Symbols] 1: Rear window glass plate of automobile 2: Heater wire 4 _L : First antenna conductor 4 _R : Second antenna conductor 5: AM broadcast antenna conductor 5 _S : For AM broadcast antenna conductor 5 7 _L , 7 _R : antenna peripheral circuit 6 _L : first antenna conductor 4 _L feeding point 6 _R : second antenna conductor 4 _R feeding point 10: DC power supply 11: capacitor 20: receiver

Claims (1)

What is claimed is: 1. A first antenna conductor, a second antenna conductor, a feeding point for a first antenna conductor and a feeding point for a second antenna conductor are provided on a rear window glass plate of an automobile. In the automotive window glass antenna, the distance between the center of the feeding point of the first antenna conductor and the left side of the rear window glass plate is 30 to 300 mm, and the center and rear of the feeding point of the first antenna conductor The distance between the upper side of the window glass plate is 100 mm or less, the distance between the center of the feeding point of the second antenna conductor and the right side of the rear window glass plate is 30 to 300 mm, and the feeding of the second antenna conductor The distance between the center of the point and the upper side of the rear window glass plate is within 100 mm, and the distance between the center of the feeding point of the first antenna conductor and the center of the feeding point of the second antenna conductor is 300 mm or more apart. A window glass antenna for automobiles.