KR100309188B1 - Antenna for vehicle window glass - Google Patents

Abstract

The window glass antenna device of the present invention includes an antenna pattern portion 12 made of a conductive wire E provided in the window glass 11 fitted into the opening 10 of the metal body, and a feed line 14 connected thereto. The antenna pattern portion 12 acts as an electric field antenna for wave reception, and the non-conductive slot portion 15 formed between the opening portion 10 and the antenna pattern portion 12 for FM wave reception receives the FM. It acts as a magnetic field antenna resonating in frequency. In addition, a device using a defroster 13 formed of a heater line H in the antenna device, or a second antenna pattern portion 16 is added to the antenna device to form an electric field antenna. The device and the magnetic field antenna enable FM wave diversity reception.

Description

Window glass antenna device {ANTENNA FOR VEHICLE WINDOW GLASS}

1 is a view showing the configuration of a window glass antenna device for a vehicle according to Embodiment 1 of the present invention;

2 is a view for explaining the AM wave reception function of the window glass antenna device for a vehicle according to Embodiment 1 of the present invention;

3 is a view for explaining the FM wave reception function of the window glass antenna device for a vehicle according to Embodiment 1 of the present invention;

4 is a view showing the configuration of a window glass antenna device for a vehicle according to a second embodiment of the present invention;

5 is a view showing the configuration of a window glass antenna device for a vehicle according to a third embodiment of the present invention;

6 is a view for explaining the AM wave reception function of the window glass antenna device for a vehicle according to Embodiment 3 of the present invention;

7 is a view for explaining the FM wave reception function of the window glass antenna device for a vehicle according to Embodiment 3 of the present invention;

8 is a view showing the configuration of a window glass antenna device for a vehicle according to a fourth embodiment of the present invention;

FIG. 9 is a view showing the characteristics of the window glass antenna device for a vehicle according to the first to fourth embodiments of the present invention, and shows the relationship between the electric field and the magnetic field when a standing wave is generated in the window glass antenna. Figure,

10 is a view showing the characteristics of the window glass antenna device for a vehicle according to the first embodiment to the fourth embodiment of the present invention, showing the return loss characteristics of the window glass antenna,

11 is a view showing a specific configuration of a test article according to an experimental example of the present invention,

12 is a characteristic measurement diagram for an experimental product according to an experimental example of the present invention, showing a Smith chart showing impedance characteristics;

FIG. 13 is a view showing characteristics of an experimental product according to an experimental example of the present invention and showing VSWR characteristics. FIG.

14 is a characteristic measurement diagram comparing the characteristics of the experimental product and the conventional product according to the experimental example of the present invention. FIG. 14 is a frequency characteristic diagram of an S.G output when an AM wave is received in a first antenna pattern part.

FIG. 15 is a characteristic measurement diagram comparing the characteristics of a test product and a conventional product according to an experimental example of the present invention, and showing a frequency characteristic of an SG output when receiving an FM wave (horizontal polarization) in a first antenna pattern part. Degree,

FIG. 16 is a characteristic measurement diagram comparing the characteristics of the experimental product and the conventional product according to the experimental example of the present invention, wherein the frequency characteristics of the SG output when the FM wave (vertical polarization) is received in the first antenna pattern part. Drawing,

FIG. 17 is a characteristic measurement diagram comparing the characteristics of the experimental product and the conventional product according to the experimental example of the present invention, wherein the frequency characteristics of the SG output when the FM wave (horizontal polarization) is received in the second antenna pattern part. Drawing,

FIG. 18 is a characteristic measurement diagram comparing the characteristics of the experimental product and the conventional product according to the experimental example of the present invention, wherein the frequency characteristics of the SG output when receiving the FM wave (vertical polarization) in the second antenna pattern portion Drawing,

19 is a diagram showing the configuration of a window glass antenna device for a vehicle according to one conventional example;

20 is a diagram showing the configuration of a window glass antenna device for a vehicle according to another conventional example.

* Explanation of symbols for the main parts of the drawings

10: metal body opening 12: antenna pattern portion

12a, 12b: wires 13 and 33: defroster

14 feeder 15 non-conductive slot portion

16: antenna pattern portion 16a, 16b: second antenna pattern portion

17: second feed line 18, 40: power supply circuit

19: active impedance converter 20: capacitance pattern portion

21: vertical line portion 30: the window frame of the metal body

31: window glass 32: dedicated antenna pattern portion

41: high frequency choke coil for AM wave 42: high frequency choke coil for FM wave

43: compensation circuit 44: AM wave wideband preamplifier

45: FM wave broadband preamplifier

[Purpose of invention]

[Technical Field to which the Invention belongs and Prior Art in the Field]

TECHNICAL FIELD This invention relates to the window glass antenna apparatus which used the thin wire provided in the rear window glass of an automobile, etc. as an antenna for reception of AM wave and FM wave, for example.

As a window glass antenna device for automobiles known in the art, for example, a defogger made of an anti-defrost heater wire provided in advance in a rear window glass of an automobile is used as an electric field antenna, or separately from the defroster, For example, a dedicated antenna pattern made of strip-shaped thin wires is formed on the window glass and used as an electric field antenna.

Fig. 19 shows a conventional example in which a defroster 33 made of electrons, i.e., a heater line H, is used as an antenna. As shown, between the defroster 33 made of the heater wire H provided on the window glass 31 and the power supply circuit 40, a high frequency choke coil for AM waves for separating and separating the heater wire H at high frequency ( The defroster 33 can be used as an electric field antenna via 41) (1 mH to 3 mH) and a high frequency choke coil 42 (3 mu H to 10 mu H) for FM waves.

Since the high frequency choke coils 41 and 42 flow a DC high current of about 10 to 30 amps, the high frequency choke circuits 41 and 42 can flow the DC high current while ensuring necessary inductance. It is necessary to provide the thing. In particular, as the high frequency choke coil 41 for AM waves, a choke coil or the like having a thick wire as a bifilar winding in a high autonomous ferrite core is required.

In addition, since the defroster 33 is not essentially designed for an antenna, in order to have a function as an antenna (especially to obtain a reception function of an FM wave), a compensation circuit 43 is added to the entire FM wave band. It is necessary to obtain resonance over. The AM wave wideband preamplifier 44 and the FM wave wideband preamplifier are used to improve the matching between the antenna A side and the feed line F side for both the AM wave and the FM wave, and to improve the sensitivity. 45 is inserted.

20 shows a latter example, that is, a conventional example in which the dedicated antenna pattern portion 32 is separately formed. As shown, the dedicated antenna pattern portion 32 is shaped so that good characteristics can be obtained as an electric field antenna (especially as an FM wave receiving antenna). However, since the antenna pattern portion 32 has a large reception loss with respect to AM wave reception, the defroster 33 is generally used at the high frequency choke coil 41 for AM waves as in the case shown in FIG. In addition to separation and independence, the gap G between the antenna pattern portion 32 and the heater wire H is narrowed to electrostatically couple both to improve sensitivity. In addition, in order to improve the matching between the antenna A side and the feed line F side with respect to both the AM wave and the FM wave, and to improve the sensitivity, the AM wave wideband preamplifier 44 and the FM wave wideband preamble are similarly shown in FIG. 19. The amplifier 45 is inserted.

[Technical problem to be achieved]

In the conventional window glass antenna device, the first to fourth problems described below exist.

First, in the case of the window glass antenna device using the defroster 33 made of the heater line H as an antenna, the defroster 33 made of the heater line H is provided with a power supply circuit 40 and a metal body. It is preferable to separate and independence from the window frame 30 of a high frequency. For this purpose, large high-frequency choke coils 41 and 42 capable of withstanding the flow of a large direct current (heater current) of about 10 to 30 amps and ensuring a predetermined inductance are required. In addition, since the high frequency choke coil 41 for AM waves cannot easily obtain a desired function, it becomes considerably expensive. In addition, in order to function the heater wire H as an antenna capable of receiving FM waves, a compensating circuit 43 having a complicated configuration is required. In order to improve the matching between the antenna A side and the feed line F side and to improve the sensitivity, a special AM wave wideband preamplifier 44 and an FM wave wideband preamplifier 45 are required. Therefore, the window glass antenna device shown in FIG. 19 has a drawback that it is necessary to add a large and complicated high-cost circuit device in order to function as an antenna.

Secondly, in the case of the window glass antenna device using the dedicated antenna pattern portion 32 shown in Fig. 20, since the antenna pattern portion 32 is formed so as to obtain necessary characteristics as an antenna, a specific frequency AM wave and A relatively good reception characteristic is obtained for the FM wave. However, since the dedicated antenna pattern portion 32 is formed of a thin wire, it is not possible to sufficiently secure the frequency band required for reception by this alone. In addition, since the conductor area necessary for the antenna cannot be sufficiently obtained, the antenna capacitance Ca which contributes to radiation becomes small for AM waves, and the capacity division loss with the feeder capacity Cf becomes large. Therefore, there is a drawback that the reception sensitivity becomes remarkably low. Therefore, in a typical case, as illustrated, the defroster 33 made of the heater line H is also used as a part of the AM wave antenna to improve the sensitivity. Therefore, in the case of FIG. 20, similarly to the case of FIG. 19, at least an AM wave high-frequency choke coil 41 is required, and, similarly to the former, has a drawback in that it has a large and complicated configuration and cannot be manufactured at low cost.

Third, also in the case of Figs. 19 and 20, in order to improve the matching between the antenna A side and the feed line F side and to raise the sensitivity, the AM broadband amplifier 44 and the FM broadband amplifier 45 are used. For this reason, due to the influence of thermal noise generated from the wide-band amplifiers 44 and 45, the sensitivity increases in reception in the weak electric field, but the noise also increases. Therefore, practical sensitivity (S / N) hardly improves. In the strong electric field, the inputs of the band amplifiers 44 and 45 become overloaded, intermodulation and intermodulation occur, and interference or voice distortion occurs. In addition, since the broadband amplifiers 44 and 45 are expensive, the price increase is also a big problem.

Fourth, even in the case of Figs. 19 and 20, since no means for diversity reception of FM waves is provided, diversity reception of FM waves is not performed. However, even if a separate field antenna for enabling FM wave diversity reception is formed in the same window glass, since the same field antenna cannot take sufficient distances from the main antenna, a space diversity effect can be obtained. I can hardly get it.

The object of the present invention is to provide a window glass antenna device as described below, namely

(a) Window glass antenna device having high gain, wideband, low noise AM / FM wave reception characteristics.

(b) A window glass antenna arrangement that enables effective reception of diversity of FM waves.

(c) To provide a window glass antenna device that is reliable and can be manufactured at low cost without requiring complicated and expensive high frequency choke coils, compensation circuits, and broadband amplifiers.

[Configuration of Invention]

In order to achieve the above object, the window glass antenna device of the present invention is configured as described below.

(1) The window glass antenna device of the present invention is connected to an antenna pattern portion 12 made of a lead E provided in a window glass 11 fitted into an opening 10 of a metal body, and connected to the antenna pattern portion 12. And an antenna pattern portion 12 as an electric field antenna for AM wave reception, and an opening 10 and the antenna pattern portion 12 of the metallic body for FM wave reception. A non-conductive slot 15 formed between the perimeters of?) Acts as a magnetic field antenna resonating with the FM wave reception frequency.

(2) The window glass antenna device of the present invention includes a frost eliminator 13 formed of a heater wire H provided in a window glass 11 fitted into an opening 10 of a metal body, and a frost remover 13. An antenna pattern portion 12 formed of a conductive line E provided adjacent to the window glass 11 and a feed line 14 connected to the antenna pattern portion 12, and the antenna pattern portion for AM wave reception. (12) acts as an electric field antenna, and is non-conductive formed around the opening 10 of the metallic body and the defroster 13 and the antenna pattern portion 12 with respect to FM wave reception. The slot 15 is characterized in that it acts as a magnetic field antenna resonant with the FM wave reception frequency.

(3) The window glass antenna device of the present invention includes a first antenna pattern portion 12 made of a conductive wire E provided in a first region of the window glass 11 fitted into the opening 10 of the metal body, and the first The second antenna pattern portion 16 comprising a first feed line 14 connected to the antenna pattern portion 12 and a lead E provided in a second region spaced apart from the first region of the window glass 11. And a second feed line 17 connected to the second antenna pattern portion 16, and with respect to AM wave reception, the first antenna pattern portion 12 acts as an electric field antenna EA and receives FM waves. As for the first FM wave reception antenna of the magnetic field type, in which the non-conductive slot portion 15 formed between the opening 10 of the metal body and the periphery of the antenna pattern portion 12 resonates with the FM wave reception frequency. At the same time, the second antenna pattern portion 16 serves as an electric field type second FM wave reception antenna. And FM wave diversity reception is enabled in the first FM wave receiving antenna and the second FM wave receiving antenna.

(4) The window glass antenna device of the present invention includes a frost eliminator 13 and a side of the frost remover 13 formed of the heater line H provided in the window glass 11 fitted into the opening 10 of the metal body. A first antenna pattern portion 12 made of a conductive wire E provided on the window glass 11 adjacent to the first antenna pattern portion 12, a first feed line 14 connected to the first antenna pattern portion 12, and the defrosting portion ( A second antenna pattern portion 16 formed of a conductive wire E provided on the window glass 11 adjacent to the other side of the window 13, and a second feed line 17 connected to the second antenna pattern portion 16; For the AM wave reception, the first antenna pattern portion 12 acts as an electric field antenna, and for the FM wave reception, the periphery of the opening 10 and the defroster 13 of the metal body and the first antenna pattern portion 12 are applied. Magnetic field in which the non-conductive slot portion 15 formed between the periphery of the antenna pattern portion 12 resonates with the FM wave reception frequency. Simultaneously acting as a first FM wave reception antenna, the second antenna pattern portion 16 acts as a second FM wave reception antenna of an electric field type, and the first FM wave reception antenna and the second FM. FM wave diversity reception is enabled by an antenna for receiving waves.

As a result of devising the means (1) to (4), the following actions occur respectively.

(1) In the window glass antenna device of the present invention, at the time of reception of AM wave (540-1620 kHz), since the antenna pattern part 12 which consists of conducting wire E provided suitable for reception of AM wave acts as an electric field antenna, This makes it possible to receive good AM waves. In addition, upon reception of FM waves (76 to 90 MHz), the slot 15 formed between the opening 10 of the metal body and the periphery of the antenna pattern portion 12 acts as a magnetic field antenna. That is, a circuit resonating with the FM reception frequency formed in the slot 15 is operated. As a result, good VSWR characteristics are obtained over the entire FM wave bandwidth.

(2) In the window glass antenna device of the present invention, the non-conductive slot portion 15 exhibits a required pattern due to the presence of the defrosting portion 13 adjacent to the antenna pattern portion 12. As a result, the function of the magnetic field antenna is accurately obtained.

(3) In the window glass antenna device of the present invention, [magnetic field / field] diversity reception is performed by a magnetic field antenna composed of the slot 15 and a linear field antenna composed of the second antenna pattern portion 16. Since it is configured to be possible, FM wave diversity reception can be effectively performed even in a limited narrow space.

(4) In the window glass antenna device of the present invention, the non-conductive slot portion 15 exhibits a required pattern due to the presence of the defrosting portion 13 adjacent to the first antenna pattern portion 12. The function of the antenna is accurately obtained, and the magnetic field antenna composed of the slot portion 15 and the linear field antenna composed of the second antenna pattern portion 16 enable the [magnetic field / electric field] diversity reception. Therefore, the FM wave diversity reception can be effectively performed even in a limited narrow space.

Example 1

1 is a view showing the configuration of a window glass antenna device for a vehicle according to Embodiment 1 of the present invention. As shown in FIG. 1, an antenna made of an elongated conductor E in an upper region (region of FIG. 1) spaced apart by a gap G1 from an upper edge of the window glass 11 fitted into the opening 10 of the metal body of the automobile. The pattern part 12 is provided. In the center area | region of the said window glass 11, the frost removal part 13 which consists of frost prevention heater wire | line H is provided apart from the said antenna pattern part 12 by the gap G2.

At a predetermined position P of the antenna pattern portion 12 (for example, a position slightly shifted to the right side from the center position of the first antenna pattern portion 12, the optimum position of the matching is determined by experiment), the coaxial feed line At one end of (14), the center conductor a is connected. The outer conductor b of the feed line 14 is connected to the opening 10 of the metal body. The other end of the feed line 14 is connected to the work end of the receiver (not shown). In FIG. 1, the power supply circuit of the defroster 13 is omitted.

In this way, the non-conductive slot portion 15 is formed between the metallic body opening 10, the periphery of the antenna pattern portion 12, and the periphery of the defrosting portion 13. In addition, the conducting wire E constituting the antenna pattern portion 12 can sufficiently narrow the mutual gap and increase the number of the wires so that the antenna capacitance Ca which contributes to the radiation of the field-type antenna becomes large. In addition, the conducting wires E are short-circuited with the conducting wires 12a. Moreover, in order to resonate the magnetic field antenna which consists of the slot part 15 to FM reception frequency at predetermined frequency (76-90 MHz), the shape and dimension of the antenna pattern part 12 are adjusted suitably.

2 and 3 are diagrams for explaining the AM wave reception function and the FM wave reception function in the first embodiment shown in FIG. 1, respectively. In the window glass antenna device for automobiles of the first embodiment, as shown in FIG. 2 for AM wave reception, the first antenna pattern portion 12 acts as an electric field antenna EA. Regarding FM wave reception, as shown in FIG. 3, the non-conductive slot portion 15 acts as a magnetic field antenna MA resonating with the FM wave reception frequency.

Next, the operation of the window glass antenna device for automobile of Example 1 configured as described above will be described. At the reception of the AM wave (540-1620 kHz), the antenna pattern portion 12 made of the conducting wire E operates as an electric field antenna EA, but the length of the antenna pattern portion 12 is that of the AM wave having a frequency of 540-1620 kHz. It is extremely short compared to the wavelength of 555-185m. Therefore, the antenna pattern portion 12 is an antenna with high capacitiveness. The antenna capacitance Ca contributing to the radiation at this time is around 10 pF, and a loss of -20 dB or more occurs due to the capacitance division loss caused by the stray capacitance Cs of the antenna pattern portion 12 and the capacitance Cf of the feed line 14. By the way, in the window glass antenna device of the present embodiment, the AM wave reception loss is designed to be small. That is, since the conducting wire E of the antenna pattern part 12 has a narrow mutual space | interval enough, and also increases the number of the wires, antenna capacity becomes comparatively large and the said loss can be minimized. In this way, good AM wave reception is possible.

When receiving the FM wave (76 to 90 MHz), the slot portion 15 of the predetermined pattern formed between the periphery of the opening 10 and the antenna pattern portion 12 of the metal body and the periphery of the defrosting portion 13. ) Acts as a magnetic field antenna MA. That is, a circuit resonating with the FM wave reception frequency formed in the slot 15 is operated at a predetermined FM wave frequency. As a result, good VSWR characteristics are obtained over the entire FM wave bandwidth. In addition, even when the defrosting part 13 does not exist, the antenna pattern part 12 so that the slot part 15 of a predetermined pattern is formed between the opening part 10 of the metal body and the circumference | surroundings of the antenna pattern part 12. Is formed, the slot 15 acts as a magnetic field antenna MA.

Example 2

4 shows the configuration of a window glass antenna device for a vehicle according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected to the part which has the same function as FIG. As shown in FIG. 4, in Example 2, the 2nd antenna pattern part 16 which consists of conducting wire E is provided in the lower area | region (2nd area | region) of the window glass 11. As shown in FIG. The second feed line 17 is connected to the second antenna pattern portion 16. Other than the above, it is the same structure as Example 1 mentioned above.

Therefore, in the AM wave reception, similarly to the first embodiment, the first antenna pattern portion 12 acts as an electric field antenna EA, and in the FM wave reception, the opening 10 and the antenna pattern portion of the metallic body ( A non-conductive slot 15 formed between the periphery 12 acts as a magnetic field-type first FM wave receiving antenna FA1 that resonates with the FM reception frequency, and the second antenna pattern portion 16 is of an electric field type. It acts as an antenna FA2 for receiving the second FM wave. In this way, FM wave diversity reception is performed by the first FM wave receiving antenna FA1 and the second FM wave receiving antenna FA2.

In the vehicle window glass antenna device of the second embodiment as described above, the electric field-type second FM consisting of the magnetic field-type first FM wave receiving antenna FA1 of the slot portion 15 and the second antenna pattern portion 16 The wave reception antenna FA2 is configured to enable [magnetic / field] diversity reception. For this reason, FM wave diversity reception can be performed efficiently even in a limited narrow space. Except for the above, the same operation as in the above-described first embodiment occurs.

Example 3

5 shows the configuration of a window glass antenna device for a vehicle according to Embodiment 3 of the present invention. As shown in FIG. 5, an antenna pattern portion 12 made of an elongated lead E is provided in the upper region (first region) of the window glass 11 fitted into the opening 10 of the metal body of the automobile. have. In the center area | region of the said window glass 11 adjacent to the lower end part of this antenna pattern part 12, the frost removal part 13 which consists of frost prevention heater wires H is provided. In the lower region (second region) of the window glass 11 adjacent to the lower end portion of the defrosting portion 13, second antenna pattern portions 16 (16a, 16b) made of conductive wires E are provided.

One end of the first feed line 14 is connected to the predetermined position P of the first antenna pattern portion 12 similarly to the first embodiment. The power supply circuit 18 is connected to both ends of the heater wire of the defroster 13. One end of the second feed line 17 is connected to the base end of the second antenna pattern portion 16 (16a, 16b). In this way, a non-conductive slot portion 15 is formed between the opening 10 of the metal body, the circumference of the defroster 13, and the circumferences of the first and second antenna pattern portions 12, 16. . In addition, a plurality of conductors 12a and 12b (two in this embodiment) between the middle portions of the conductor E so that the antenna capacitance Ca which contributes to the radiation of the electric field antenna composed of the first antenna pattern portion 12 becomes large. Short circuit). The same as in Example 1 except for the above.

6 and 7 are diagrams for explaining the reception functions of the AM wave and the FM wave in the third embodiment shown in FIG. In the automotive window glass antenna device of this embodiment, as shown in Fig. 6, the first antenna pattern portion 12 acts as an electric field antenna EM with respect to AM wave reception. As shown in Fig. 7, the non-conductive slot section 15 acts as a magnetic field-type first FM wave reception antenna FA1 that resonates with the FM reception frequency and receives a second antenna for FM wave reception. The pattern portion 16 acts as an electric field type second FM wave reception antenna FA2. In this way, the first FM wave receiving antenna FA1 and the second FM wave receiving antenna FA2 are configured to enable FM wave diversity reception.

In the vehicle window glass antenna device of the third embodiment as described above, the magnetic field-type first FM wave receiving antenna FA1 consisting of the slot portion 15 and the second antenna pattern portions 16 (16a, 16b) are provided. It is comprised so that [magnetic / field] diversity reception is possible by the 2nd electric field type | mold FM wave receiving antenna FA2. For this reason, FM wave diversity reception can be performed efficiently even in a limited narrow space. Except for the above, the same operation as in the above-described first embodiment occurs.

Example 4

8 is a view showing the configuration of a window glass antenna device for a vehicle according to a fourth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same part as FIG. As shown in FIG. 8, in Example 4, the antenna pattern part 12 consists of the transparent conductive film T also including the conducting wire E and this conducting wire E so that it may be in an electrically conductive state. An AM wave active impedance converter 19 is interposed between the first antenna pattern portion 12 and the first feed line 14. This active impedance converter 19 is an electronic device for converting an input impedance (hundreds of kHz) into a low output impedance (hundreds of kHz) without changing the signal level. In addition, a capacitance pattern portion 20 is formed between the defrosting portion 13 and the opening 10 of the metal body, and the defrosting portion 13 and the metal body pass through the capacitance pattern portion 20. The short circuits between the openings 10 are made to cause the FM wave to fall to the earth at high frequency by the vertical line portion 21 of the capacitance pattern portion 20. Therefore, it is possible to adjust the equivalent electric field (that is, the resonance frequency) of the slot 15 by the position where the vertical line portion 21 is provided. Except for the above, the same operation as in the above-described third embodiment occurs.

In the window glass antenna device for a vehicle of Example 4 comprised as mentioned above, since the conducting wire E which comprises the 1st antenna pattern part 12 is coat | covered with the transparent conductive film (including the semi-transparent conductive film) T, The effective area of the first antenna pattern portion is increased by the transparent conductive film T, and the antenna capacitance Ca which contributes to the radiation of the field-type antenna is larger than that in the third embodiment. In addition, since the AM wave active impedance converter 19 is interposed between the first antenna pattern portion 12 and the first feed line 14, the apparent active impedance is lowered by several hundreds of kHz. The loss is less. Specifically, a loss of -20 dB or more is about-several dB.

In addition, the slot length of the slot portion 15 is equivalent by the position of the vertical line portion 21 of the capacitance pattern portion 20 formed between a part of the defrosting portion 13 and the opening portion 10 of the metal body. Since the magnetic field antenna formed of the slot 15 can be accurately resonated at a predetermined frequency (76 to 90 MHz). Except for the above, the same operation as in Example 1 occurs.

FIG. 9 is a diagram showing the characteristics of the window glass antenna device for automobiles according to the first to fourth embodiments, showing a relationship between an electric field and a magnetic field when standing waves occur in the window glass antenna. As shown in the figure, the electric field and the magnetic field have a phase shift of 90 °.

FIG. 10 is a diagram showing the characteristics of the window glass antenna device for automobiles according to the first to fourth embodiments, and shows the reflection loss (return loss) characteristics of the window glass antenna. As shown in the figure, the reflection loss in the FM band is suppressed within the range of -9 dB to -15 dB.

Experimental Example

11-18 is a figure which shows the experiment example which concerns on this invention, and FIG. 11 is a figure which shows the specific structure of the experiment article V. As shown in FIG. As shown in the drawing, the first antenna pattern portion 12 is provided in the upper region (first region) of the window glass 11 in the rear of the vehicle body fitted into the opening 10 of the metal body. That is, the first antenna pattern portion 12 has its upper end separated from the upper edge of the opening 10 of the metal body by a gap G1 (about 40 mm), and both left and right ends thereof from the left and right edges of the opening 10 of the metal body. It is provided in the position separated by distance L1 (about 80 mm). In the first antenna pattern portion 12, six thin wires E extending in the horizontal direction are arranged in parallel at equal intervals S1 (about 15 mm), and both the left and right ends of the wire E and near the center are conductive wires 12a to 12c. It is short-circuited by). The position P which is shifted outwardly by L2 (about 50 mm) from the center position 0 in the horizontal direction of the first antenna pattern portion 12, that is, the position of the approximately center portion shorted by the conducting wire is the upper edge of the opening 10. It is connected to the coaxial feeder connection terminal T1 attached to the part.

The defrosting part 13 is provided in the center region of the window glass 11. That is, the defrosting part 13 has an upper end thereof separated from the lower part of the first antenna pattern part 12 by a gap G2 (about 30 mm), and the left end portions of the defrosting part 13 are separated from the left and right edges of the opening 10 of the metal body. It is provided by the distance L3 (about 15 mm) in the upper end part, and is provided in the position separated by the distance L4 (about 10 mm) in the lower end part. The defrosting part 13 has 14 thin heater wires H extending in the horizontal direction arranged in parallel at equal intervals S2 (about 18 mm), and the left end of the heater wires H is short-circuited with a relay lead 13c, The right end part of the said heater wire H is each short-circuited by the positive side conductor line 13a and the negative side conductor line 13b, respectively. Both leads 13a and 13b are connected to heater power supply terminals X and Y, respectively.

The second antenna pattern portion 16 is provided in the lower region (second region) of the window glass 11. That is, the second antenna pattern portion 16 is approximately at the center portion in the left-right direction of the opening portion 10 of the metal body, and its upper end portion is spaced apart from the lower portion of the defroster 13 by a gap G3 (about 13 mm), The lower end part is provided in the position spaced apart by the gap G4 (about 9 mm) from the lower edge part of the opening part 10 of the metal body. The second antenna pattern portion 16 includes a first element 16a formed of a lead E having a length L5 (about 1093 mm) extending in a horizontal direction, and a second element made of a lead E having a length L6 (about 720 mm). 16b is arrange | positioned in parallel by space | interval S3 (about 20 mm), and both have comprised the form connected by the conducting wire 16c. The connection point by the conducting wire 16c is a position separated by the distance L7 (about 175 mm) from the right end of the 1st element 16a. The right end of the second element 16b of the second antenna pattern portion 16 is connected to the coaxial feed line connection terminal T2 attached to the lower edge portion of the opening 10.

In addition, the experimental product V is designed to exhibit good reception characteristics in a relatively high frequency band of about 88 to 108 MHz with respect to FM waves.

FIG. 12 is a Smith chart showing the results of measuring impedance characteristics with respect to the experimental article V shown in FIG. 11, and FIG. 13 is a graph showing the results of measuring VSWR characteristics with respect to the same experimental article V. FIG.

As can be seen from FIG. 12 and FIG. 13, this experimental product V has impedance characteristics and VSWR characteristics that can be practically used over an FM wave bandwidth (oversea band) of 88 to 108 [MHz].

FIG. 14 shows the SG output (MOD 400Hz, 30% transmission wave when AM wave is received by the first antenna pattern portion 12 using the experimental product V and the conventional product W shown in FIG. 11 as contrast samples. Fig. 2 shows the results of the actual measurement on the frequency characteristics of S / N = 20dB (SG output when acquiring radio sound quality of about 10%).

15 and 16 show the SG output (MOD) when the FM wave (horizontal polarization and vertical polarization) are respectively received by the first antenna pattern portion 12 using the experimental product V and the conventional product W as contrast samples. Figure 1 shows the results of the measurement of the frequency characteristics when a radio frequency of 1 KHz, DEM 22.5 KHz and S / N = 30 dB (THD about 3%) are obtained.

17 and 18 show the SG output (MOD) when the FM wave (horizontal polarization and vertical polarization) are respectively received by the second antenna pattern portion 16 using the same experimental product V and the conventional product W as contrast samples. Figure 1 shows the results of the measurement of the frequency characteristics when a radio frequency of 1 KHz, DEM 22.5 KHz and S / N = 30 dB (THD about 3%) are obtained.

As can be seen from the measured results of Figs. 14 to 18, the experimental product V has a larger negative value of the SG output than the conventional product W in the relatively high frequency band of 88 to 108 MHz, and shows good reception characteristics. Confirmed.

[Modification]

In addition, the present invention is not limited to Examples 1 to 4 and Experimental Examples, and the following modifications are possible. For example, the above embodiment shows an example in which the present invention is applied to a window glass antenna device for an automobile, but may be widely applied to another vehicle or a window glass antenna device for a building, such as a train or a ship.

[Synthesis of Example]

The configuration and operational effects of the window glass antenna device shown in the embodiment are as follows.

[1] The window glass antenna device shown in the embodiment includes an antenna pattern portion 12 made of a lead E provided in a window glass 11 fitted into an opening 10 of a metal body, and the antenna pattern portion 12 The feeder line 14 is connected, and the antenna pattern portion 12 acts as an electric field antenna for AM wave reception, and the opening 10 and the antenna pattern portion of the metallic body for FM wave reception. The non-conductive slot portion 15 formed between the periphery 12 is configured to act as a magnetic field antenna resonating with the FM reception frequency.

Therefore, in the window glass antenna device, when the AM wave (540 to 1620 kHz) is received, since the antenna pattern portion 12 made of the conducting wire E, which is formed to be suitable for the reception of the AM wave, acts as an electric field antenna, good AM wave reception This becomes possible. When receiving the FM wave (76 to 90 MHz), the slot portion 15 formed between the opening 10 of the metal body and the periphery of the antenna pattern portion 12 acts as a magnetic field antenna. That is, a circuit resonating with the FM reception frequency formed in the slot 15 is operated. As a result, good MSWR characteristics are obtained over the entire FM wave bandwidth.

[2] The window glass antenna device shown in the embodiment includes a frost eliminator 13 and a frost eliminator 13 formed of a heater line H attached to a window glass 11 fitted into an opening 10 of a metal body. And an antenna pattern portion 12 made of a conductive wire E provided on the window glass 11 adjacent to and a feed line 14 connected to the antenna pattern portion 12. The antenna pattern is received with respect to AM wave reception. The portion 12 acts as an electric field antenna, and a non-conductive material is formed between the opening 10 of the metallic body and the circumference of the defroster 13 and the circumference of the antenna pattern portion 12 with respect to FM wave reception. The slot portion 15 is configured to act as a magnetic field antenna resonant with the FM reception frequency.

Therefore, in the window glass antenna device, since the non-conductive slot portion 15 exhibits a required pattern due to the presence of the defrosting portion 13 adjacent to the antenna pattern portion 12, the function of the magnetic field antenna is precisely corrected. Obtained.

[3] The window glass antenna device shown in the embodiment includes a first antenna pattern portion 12 made of a lead E provided in a first area of the window glass 11 fitted into the opening 10 of the metal body, and The second antenna pattern portion 16 consisting of a first feed line 14 connected to the first antenna pattern portion 12 and a conductive wire E provided in the second region spaced apart from the first region of the window glass 11. ) And a second feed line 17 connected to the second antenna pattern portion 16, wherein the first antenna pattern portion 12 acts as an electric field antenna when receiving AM waves, and receives FM waves. As for the non-conductive slot portion 15 formed between the opening 10 of the metallic body and the periphery of the antenna pattern portion 12, it acts as an antenna for receiving the first FM wave of the magnetic field type which resonates with the FM reception frequency. At the same time, the second antenna pattern portion 16 acts as an antenna for receiving the second FM wave of the electric field type. The first FM wave receiving antenna and the second FM wave receiving antenna are configured to enable FM wave diversity reception.

Therefore, in the window glass antenna apparatus, the magnetic field antenna composed of the slot portion 15 and the linear field antenna composed of the second antenna pattern portion 16 are configured to enable [magnetic field / field] diversity reception. Therefore, it is possible to effectively perform FM wave diversity reception even in a limited narrow space.

[4] The window glass antenna device shown in the embodiment includes a frost eliminator 13 formed of a heater line H provided in a window glass 11 fitted into an opening 10 of a metal body, and the frost remover 13. A first antenna pattern portion 12 made of a conductive wire E attached to the window glass 11 adjacent to one side of the first antenna line, a first feed line 14 connected to the first antenna pattern portion 12, and A second antenna pattern portion 16 made of a conductive wire E provided on the window glass 11 adjacent to the other side of the removing portion 13, and a second feed line 17 connected to the second antenna pattern portion 16; The first antenna pattern portion 12 serves as an electric field antenna for AM wave reception, and the periphery of the opening 10 and the defroster 13 of the metal body for FM wave reception. And the non-conductive slot portion 15 formed between the first antenna pattern portion 12 and the periphery of the first antenna pattern portion 12 are resonant with the FM wave reception frequency. Acts as an antenna for receiving a magnetic field type first FM wave, and at the same time, the second antenna pattern portion 16 acts as an antenna for receiving an electric field type second FM wave, and the first FM wave receiving antenna and the second The FM wave reception antenna is configured to enable FM wave diversity reception.

Accordingly, in the window glass antenna device, on the one hand, the non-conductive slot portion 15 exhibits a required pattern due to the presence of the defrosting portion 13 adjacent to the first antenna pattern portion 12. The function of the type antenna is obtained accurately. On the other hand, since the magnetic field antenna composed of the slot portion 15 and the linear field antenna composed of the second antenna pattern portion 16 are configured to enable [magnetic field / electric field] diversity reception, Even in a limited narrow space, it becomes possible to effectively perform FM wave diversity reception.

[5] The window glass antenna device shown in the embodiment is the window glass antenna device described in each of [1] to [4] above, wherein the antenna pattern portion 12 includes a conductive line E containing a transparent conductive film (including a translucent conductive film). It is characterized by being covered with T.

Therefore, in the wing pane glass antenna device, since the conducting wire E is covered by the transparent conductive film (including the semi-transparent conductive film) T, the effective area of the first antenna pattern portion 12 is determined by this transparent conductive film T. Increasingly, the antenna capacitance Ca which contributes to the radiation of the field antenna becomes larger.

[6] The window glass antenna device shown in the embodiment is the window glass antenna device described in each of [1] to [4] above, wherein the feed line 14 has a predetermined distance in one direction from the center of the antenna pattern portion 12. It is characterized by being connected to the shifted position.

Therefore, in the window glass antenna device, matching between the antenna pattern portion 12 and the feed line 14 is performed well, thereby widening the bandwidth.

[7] The window glass antenna device shown in the embodiment is a window glass antenna device as described in the above [1] to [4], and an active impedance converter for AM waves at the connection portion between the antenna pattern portion 12 and the feed line 15 19) are interposed.

Accordingly, in the window glass antenna device, since the AM impedance active impedance converter 19 is interposed between the first antenna pattern portion 12 and the first feed line 14, the active impedance is apparently low in the order of several hundred kΩ. Therefore, the amount lost at the first feed line 14 is reduced. Specifically, a loss of -20 dB or more is about-several dB.

[8] The window glass antenna device shown in the embodiment is the window glass antenna device described in the above [2] or [4], wherein the capacitive pattern portion is disposed between the defrosting portion 13 and the opening portion 10 of the metal body. And forming a short circuit between the defroster 13 and the opening 10 of the metallic body via the capacitive pattern portion 20, and the FM wave is a vertical line of the capacitive pattern portion 20. The part 21 is made to fall to earth at high frequency.

Therefore, in the window glass antenna device, the slot portion 15 is positioned according to the position of the vertical line portion 21 of the capacitance pattern portion 20 formed between the defroster 13 and the opening 10 of the metal body. Since the slot length can be changed equivalently, it becomes possible to accurately resonate the magnetic field antenna composed of the slot portion 15 at a predetermined frequency (76 to 90 MHz).

[Effects of the Invention]

According to the invention, the window glass antenna device as follows, namely

(a) a window glass antenna device having high gain, wideband, low noise AM / FM wave reception characteristics;

(b) window glass antenna arrangements for effective diversity reception of FM waves;

(c) It is possible to provide a window glass antenna device which is reliable and can be manufactured at low cost without requiring complicated and expensive high frequency choke coils, compensation circuits, and broadband amplifiers.

Claims (4)

The antenna pattern part 12 which consists of the conducting wire provided in the window glass 11 inserted in the opening part 10 of a metal body, and the feeder line 14 connected to this antenna pattern part 12 are received, and AM wave reception is received. As for the antenna pattern portion 12 acts as an electric field antenna, and for the reception of FM waves, a non-conductive slot portion 15 formed between the opening 10 of the metal body and the periphery of the antenna pattern portion 12. ) Acts as a magnetic field antenna resonating to the FM reception frequency. Defrosting part 13 which consists of heater wire H provided in the window glass 11 inserted in the opening 10 of the metal body, and the conducting wire provided in the said window glass 11 adjacent to this defrosting part 13 An antenna pattern portion 12 made of E, and a feed line 14 connected to the antenna pattern portion 12, wherein the antenna pattern portion 12 acts as an electric field antenna for AM wave reception. Regarding the wave reception, as the magnetic field antenna in which the non-conductive slot portion 15 formed between the opening portion 10 of the metal body, the defrosting portion 13, and the periphery of the antenna pattern portion resonates with the FM reception frequency. A window glass antenna device, characterized in that the function. A first antenna pattern portion 12 made of a conductive wire E provided in a first region of the window glass 11 fitted into the opening 10 of the metal body, and a first antenna connected to the first antenna pattern portion 12. On the second antenna pattern portion 16 and the second antenna pattern portion 16 made up of a feed line 14, a lead E provided in a second region spaced apart from the first region of the window glass 11. A second feed line 17 connected, wherein the first antenna pattern portion 12 acts as an electric field antenna for AM wave reception, and the opening 10 and the metal body for FM wave reception. The non-conductive slot portion 15 formed between the periphery of the antenna pattern portion 12 acts as an antenna for receiving the first magnetic field type FM wave resonating with the FM reception frequency, and the second antenna pattern portion 16 is It acts as an electric field type second FM wave receiving antenna, and the first FM wave receiving antenna A window glass antenna device which enables FM wave diversity reception by an FM wave reception antenna. The frost elimination part 13 which consists of the heater wire H provided in the window glass 11 inserted in the opening 10 of the metal body, and adjacent to one side of this frost removal part 13 is attached to the said window glass 11 The window glass adjacent to the other side of the first antenna pattern portion 12 made of the conductive wire E, the first feed line 14 connected to the first antenna pattern portion 12, and the defroster 13. And a second antenna pattern portion 16 formed of the conducting wire E provided in (11), and a second feed line 17 connected to the second antenna pattern portion 16, wherein the AM wave reception is performed in the first manner. The antenna pattern portion 12 acts as an electric field antenna, and between the opening 10 of the metal body and the circumference of the defroster 13 and the circumference of the first antenna pattern portion 12 with respect to FM wave reception. The non-conductive slot portion 15 formed in the main portion acts as an antenna for receiving the first magnetic field type FM wave resonating with the FM wave reception frequency. At the same time, the second antenna pattern portion 16 acts as an electric field-type second FM wave receiving antenna, so that FM wave diversity reception is possible by the first FM wave receiving antenna and the second FM wave receiving antenna. Window glass antenna device, characterized in that.