JPH0515515U - Feeding terminal structure for glass antenna - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the loss of high-frequency transmission at the connection between the antenna terminal of a glass antenna for automobiles and the coaxial cable, improve the matching performance level, and improve the reception performance. [Structure] By selecting the optimum position while varying the positional relationship of the insulating base portion 11 with respect to the core wire side power feeding portion 13 and the shield wire side power feeding portion 14 of an automobile glass antenna,
Impedance matching is performed under the entire circuit including the inductance circuit unit 17 while changing the capacitance of the variable capacitor formed between the first electrode unit 16 and the core side power feeding unit 13.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power supply terminal structure for a glass antenna part, and more particularly, it is formed by a conductor pattern such as a linear print conductor formed on a glass plate surface for a car window such as an automobile windshield. The present invention relates to a power supply terminal structure for a glass antenna part, which can connect a coaxial cable to the glass antenna part side while reducing loss in high-frequency transmission.

[0002]

[Prior Art]

 Recently, the automobile telephone has come to be used as a communication means between the inside and the outside of the automobile when the automobile is running.

Radio waves used in such a car telephone are mainly those belonging to the frequency band of 860 to 940 MHz, and in that case, a pole antenna is usually used as a transmitting and receiving antenna. ing.

By the way, when the above-mentioned pole antenna is used, although the required practical performance can be obtained, the pole antenna is used in a state in which it is projected in a rod shape from the vehicle body surface, which is dangerous, and it is dangerous while driving. It was pointed out that there were problems such as an unpleasant wind noise and a visually unpleasant appearance that made the appearance more complicated.

To solve such a problem, a linear printed conductor is formed by applying a conductive paste such as a silver paste in a proper pattern to a glass surface of a vehicle window such as a rear window or a side window of a vehicle such as a passenger car and sintering the same. In some cases, the conductor pattern is formed and is used as a glass antenna part for a car phone to improve it.

[0006]

[Problems to be solved by the device]

 By the way, when the glass antenna part consisting of a linear printed conductor is used as an antenna for a car phone, etc., the shield wire side of the coaxial cable is connected to the vehicle body for grounding, and the core side is the glass antenna part consisting of a conductor pattern. Therefore, a power supply terminal structure will be adopted, which is connected to the power supply section provided for this purpose through a connector having an appropriate structure.

However, when the glass antenna part is used as an antenna of a high-frequency communication device such as a car telephone with the power supply terminal structure interposed, the glass antenna part is used as an impedance and a power supply line on the glass antenna part side. A mismatch is likely to occur with the characteristic impedance on the side of the coaxial cable that is used, and this impedance mismatch causes a loss of power and significantly deteriorates the antenna characteristics. there were.

[0008]

[Means for Solving the Problems]

 The present invention has been made in view of the above problems found in the prior art, and its structural feature is that the core wire electrode portion is electrically connected to the core wire side connection terminal portion of the fixed coaxial receptacle. And an insulating base part provided with an electrode part for the shield wire which is electrically connected to the shield wire side connection terminal part, and an electrode part for the core wire in the insulating base part are connected via a dielectric layer to form a glass. The core wire side power supply part formed on the glass surface to enable power supply to the antenna part side and the shield wire side power supply part formed on the glass surface by connecting to the shield wire electrode part via the dielectric layer. The core wire electrode portion includes a first electrode portion that is directly connected to the core wire side connection terminal portion, a second electrode portion that is a connection portion to the core wire side power feeding portion, and the first electrode portion and the second electrode portion. It is composed of an inductance circuit part provided between the electrode part and the first electrode. The second electrode portion while forming the variable capacitor between the core-side feed unit and in that is connected to the core wire-side power supply portion through a dielectric layer made of an insulating adhesive.

It is desirable to connect the insulating base portion to the core-side power feeding portion and the shield wire-side power feeding portion via the dielectric layer by using a photo-curable adhesive. At least the second electrode portion of the flexible base portion is connected to the core side power feeding portion by curing with a light having a wavelength of 200 nm to 500 nm, and a photocurable insulating adhesive having a dielectric constant in the range of 2 to 10 is used. It is preferable to use it.

[0010]

[Action]

 Therefore, by selecting the optimum position while changing the arrangement relationship of the insulating base part with respect to the core wire side power supply part and the shield wire side power supply part, it is formed between the first electrode part and the core wire side power supply part. Impedance matching can be achieved under the whole circuit including the inductance circuit while changing the capacitance of the variable capacitor.

Thus, under the selected optimum positional relationship, the core wire electrode section and the shield wire electrode section are connected to the core wire side power supply section and the shield wire side power supply section with an insulating adhesive interposed. By fixing the insulating base part by adhering to each other, the mismatch condition between the glass antenna part and the coaxial cable can be improved, so that the power loss can be minimized and Excellent antenna performance with less unnecessary radiation can be obtained.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

[0013] A car window glass plate 21 mounted on a window frame of a required portion such as a rear window or a side window of an automobile has an inner glass surface 22 mainly serving as an antenna element for an automobile telephone, and a radio wave in a frequency band of 860 to 940 MHz. The glass antenna portion 23 made of an antenna conductor having an appropriate pattern having a suitable antenna gain is formed by printing a conductive paste made of silver paste or the like and firing it.

FIG. 1 is a vertical cross-sectional view showing an example of a power supply terminal structure for the glass antenna unit 23 having the above-described structure, and FIG. 2 is an overall perspective view corresponding to FIG.

According to these drawings, the whole of the feeding terminal structure for the glass antenna part according to the present invention is for the core wire which is electrically connected to the core side connecting terminal part 13 of the coaxial type receptacle 12 which is fixed. An insulating base portion 11 including an electrode portion 15 and a shield wire electrode portion 19 that is electrically connected to the shield wire side connection terminal portion 14, and a core wire electrode portion 15 in the insulating base portion 11. To connect to each other via a dielectric layer to enable power feeding to the glass antenna portion 23 side, a core wire side power feeding portion 24 formed on the vehicle interior glass surface 22 of the car window glass plate 21, a shield wire electrode portion 19, and It is composed of a shield wire side power feeding portion 25 which is formed on the same vehicle interior glass surface 22 by being connected through a dielectric layer.

Of these, in the insulating base portion 11, in addition to the glass material, the coaxial type receptacle 12 is fixedly mounted on the upper surface side of the base material made of a ceramic material, a synthetic resin material, or the like, and the silver on the bottom surface side of the base material. A conductive paste made of paste or the like is printed, and the core wire electrode portion 15 having an appropriate area formed by baking the paste is printed with the core wire side connection terminal portion 13 and also with the conductive paste, and is baked. The shield wire electrode portion 19 having an appropriate area is formed by electrically connecting the shield wire side connection terminal portions 14.

FIG. 3 shows a specific example of an arrangement pattern of the core wire electrode portion 15 and the shield wire electrode portion 19 formed on the insulating base portion 11.

Of these, the core wire electrode portion 15 formed on the bottom surface of the substrate is a first electrode portion 16 directly connected to the core wire side connection terminal portion 13 and a connection portion to the core wire side power supply portion 24. The second electrode portion 18 and the inductance circuit portion 17 provided between the first electrode portion 16 and the second electrode portion 18 are formed.

Although the inductance circuit section 17 in the illustrated example is shown as being integrally formed with the first electrode section 16 and the second electrode section 18, only the inductance circuit section 17 is used for surface mounting. It can also be formed by mounting the chip component of.

Further, the core wire electrode portion 15 of the insulating base portion 11 is provided with a dielectric layer on the core wire side power feeding portion 24 formed on the glass surface 22 inside the vehicle so that power can be fed to the glass antenna portion 23 side. Connected.

Specifically, the first electrode portion 16 side of the core wire electrode portion 15 in the insulating base portion 11 is variable between the core wire side power feeding portion 24 and the air layer as a dielectric layer. The capacitor 27 is formed and is in a conductive state in a high frequency because it has a low impedance at a carrier frequency of 860 to 940 MHz, and the second electrode portion 18 has the insulating adhesive 26 as a dielectric layer on the core wire. A capacitor 28 is formed between the side power supply section 24 and the side power supply section 24, and since the impedance is low at the carrier frequency, it becomes conductive at high frequencies.

On the side of the shielded wire electrode portion 19 of the insulating base portion 11, a capacitor 29 is formed between the shielded wire side power supply portion 25 and the insulating adhesive 26 as a dielectric layer. Has a low impedance, so it is placed in a conductive state at high frequencies.

A photo-curable insulating adhesive 26 is used to connect the core side power feeding section 24 and the shield wire side power feeding section 25 on the insulating base 11 side via a dielectric layer. The thickness at that time can be appropriately selected so that a desired capacitor capacity can be obtained.

In addition, at that time, at least the second electrode portion 18 in the insulating base portion 11 is connected to the core side power feeding portion 24, preferably, the core side power feeding portion 24 and the shield wire side of the insulating base portion 11. The connection between the power supply unit 25 and the core-side power supply unit 24 and the shield line-side power supply unit 25 is cured by light having a wavelength of 200 nm to 500 nm, and its dielectric constant is in the range of 2 to 10 and is a photo-curing type insulation. It is desirable to use a conductive adhesive 26.

Further, the respective areas of the core wire side power feeding portion 24 and the shield wire side power feeding portion 25 can be appropriately determined in relation to the individual capacitor capacities of the capacitors 27, 28 and 29 to be formed.

Since the present invention is configured in this manner, the core wire electrode portion 15 of the insulating base portion 11 is located on the core wire side power supply portion 24 side, and the shield wire electrode portion 19 is located on the shield wire side power supply portion. When connecting to the 25 side through the insulating adhesives 26, the position relationship of the insulating base 11 with respect to the core side power feeding section 24 and the shield wire side power feeding section 25 is optimized. Will be done.

That is, on the side of the first electrode portion 16 of the core wire electrode portion 15 in the insulating base portion 11, the facing area with the core wire side power feeding portion 24 can be changed by changing the positional relationship. As a result, the capacitance of the variable capacitor 27 formed between the first electrode portion 16 and the core side power feeding portion 24 can be changed.

Therefore, the capacitance of the variable capacitor 27 can be changed, and the impedance matching can be achieved as a whole while taking into consideration the inductance of the inductance circuit unit 17 and the capacitance of the second electrode unit 18. .

Therefore, the optimum position where such impedance matching can be achieved is selected, and the second electrode portion 18 of the core wire electrode portion 15 is made to interpose the insulating adhesive 26 under the selected position. An equivalent circuit as shown in FIG. 4 can be formed by adhering and fixing it on the side of the core side power feeding section 24. With such a circuit configuration, there is no gap between the glass antenna section 23 and the coaxial cable. It is possible to improve the matching state, suppress the power loss to the minimum limit, and obtain the antenna performance with less unnecessary radiation.

The connection on the side of the insulating base 11 with respect to the core wire side power feed section 24 and the shield wire side power feed section 25 is cured by light having a wavelength of 200 nm to 500 nm, and its dielectric constant is in the range of 2 to 10. When it is performed using the photo-curing type insulating adhesive 26 in Fig. 3, it is particularly suitable for use as a dielectric layer which can maintain a particularly preferable fixing strength and at the same time obtain a necessary capacitor capacity. can do.

[0031]

[Effect of the device]

 As described above, according to the present invention, the optimum position is selected by changing the arrangement relationship of the insulating base portion with respect to the core wire side power feeding portion and the shield wire side power feeding portion. Impedance matching can be achieved under the entire circuit including the inductance circuit section while changing the capacitor capacity of the variable capacitor formed between the core side power feeding section.

Therefore, under the selected optimum positional relationship, the core wire electrode portion and the shield wire electrode portion are connected to the core wire side power supply portion and the shield wire side power supply portion with an insulating adhesive interposed. By fixing the insulative base part by adhering each of them, the mismatch condition between the glass antenna part and the coaxial cable can be improved, so that the power loss can be minimized and Therefore, excellent antenna performance with less unnecessary radiation can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an example of a power supply terminal structure for a glass antenna unit according to the present invention.

2 is an overall perspective view of the embodiment of FIG.

FIG. 3 is a bottom view showing an example of an arrangement state of a core wire electrode portion and a shield wire electrode portion formed on an insulating base according to the present invention.

FIG. 4 is an equivalent circuit diagram of a power supply terminal structure according to the present invention.

[Explanation of symbols]

 11 Insulating Base Section 12 Coaxial Receptacle 13 Core Wire Side Connection Terminal Section 14 Shield Wire Side Connection Terminal Section 15 Core Wire Electrode Section 16 First Electrode Section 17 Inductance Circuit Section 18 Second Electrode Section 19 Shield Wire Electrode Section 21 Car Window Glass plate for use 22 Inside glass surface 23 Glass antenna part 24 Core side power feeding part 25 Shield wire side power feeding part 26 Insulating adhesive 27 Variable capacitor part 28 Capacitor part 29 Capacitor part

Claims (3)

[Scope of utility model registration request] 1. An insulating property provided with a core wire electrode portion which is electrically connected to a core wire side connecting terminal portion of a fixed coaxial receptacle and a shield wire electrode portion which is electrically connected to the shield wire side connecting terminal portion. The base part and the core wire side power supply part formed on the glass surface so that power can be supplied to the glass antenna part side by connecting the core wire electrode part in the insulating base part through the dielectric layer, and the shield wire And a shield wire side power supply section formed on the glass surface by connecting the electrode section for use with a dielectric layer,
The core wire electrode portion includes a first electrode portion that is directly connected to the core wire side connection terminal portion, a second electrode portion that is a connection portion to the core wire side power supply portion, and the first electrode portion and the second electrode portion. And an inductance circuit section provided between the first electrode section and the core wire side power supply section while forming a variable capacitor between the second electrode section and the core wire side power supply via a dielectric layer made of an insulating adhesive. A terminal structure for power supply for a glass antenna part, characterized in that it is connected to the part. 2. A photocurable adhesive is used to connect the insulating base portion to the core side power feeding portion and the shield wire side power feeding portion via a dielectric layer. 1. A power supply terminal structure for the glass antenna part according to 1. 3. A wavelength of 200 nm to 500 for connecting at least the second electrode portion of the insulating base portion to the core wire side power feeding portion.
3. A power supply terminal structure for a glass antenna part according to claim 1 or 2, which is a photocurable insulating adhesive which is cured by light having a wavelength of nm and has a dielectric constant in the range of 2 to 10.