CN104011936B - Antenna assembly - Google Patents

Abstract

This invention is provided with antenna element (10), for receiving BW broadcasting wave and the signal sent being superimposed upon on BW broadcasting wave；And earth element (30), there is predetermined length, earth element (30) is configured such that the relative position that can adjust relative to antenna element (10).This invention is additionally provided with feed-in element (Fp), antenna element (10) and earth element (30) are connected to feed-in element (Fp), and obtain the signal received by antenna element (10) from feed-in element (Fp).

Description

Antenna assembly

Technical field

It relates to a kind of antenna assembly being suitable to receive broadcast singal in the mobile object of such as vehicle.

Background technology

Usually as the automobile navigation apparatus being arranged in vehicle and the PND being attached on vehicle (personal navigation dress Put) antenna, the commonly used bar antenna being attached at outside vehicle maybe can bond to windshield or the thin film sky of rear glass Line.

In the case of mobile object (such as vehicle) receives broadcast, due to the impact of decay, the letter of received signal Number level changes the most greatly, and therefore, in order to make up the purpose of the decline of the reception signal caused by the impact decayed, often Perform diversity reception.But, in order to perform diversity reception, it is necessary to arrange multiple antenna.

Because so, as the antenna for performing diversity reception, because the quantity of antenna increases, so, compare and damage The bar antenna of outward appearance, more frequently being selects to have little influence on the film antenna of outward appearance.

Such as, in patent documentation 1, by installing thin film on the four of vehicle surfaces (the most forward and backward, surface, left and right) Antenna realizes the technology of the stable reception of BW broadcasting wave.

Prior art literature

Patent documentation

Patent documentation 1:JPH11-017595A

Summary of the invention

Technical problem

However, it is difficult to film antenna is attached on window, therefore, in order in an advantageous manner film antenna is bonded to Suitable position, user needs to ask experts to perform attachment.In this case, except the expense of film antenna, user is also Need to pay the expense of attachment work.

Additionally, because film antenna uses conductivity not to be good component as antenna element, and antenna cable Length is the longest, so comparing bar antenna etc., antenna gain is low.In order to solve this problem, also make in a lot of film antennas Use amplifier.But, if arranging amplifier, power consumption can be caused to increase and need the such problem of special connector.

The purpose of the disclosure is to provide a kind of excellent and antenna assembly of being easily attached in terms of receptivity.

The solution of problem

The antenna assembly of the disclosure includes: antenna element, is configured to receive BW broadcasting wave and be superimposed upon on BW broadcasting wave And the signal sent subsequently；And earth element, there is predetermined length being configured such that and can regulate relative to sky The relative angle of kind of thread elements.Further it is provided that a kind of feed-in parts, antenna element and grounded antenna are connected to this feed-in parts, And obtain the signal received by antenna element from feed-in parts.

Utilize this configuration, by adjusting the earth element angle relative to antenna element, vehicle-mounted with installation at earth element Capacitance Coupled is there is between the car body metal part of antenna.Therefore, with the ground connection acting on the antenna assembly receiving broadcast singal The area of part increase, and this improves the reception characteristic of antenna assembly.Additionally, only by by antenna element and connecing Ground element is arranged on the instrument board etc. of such as car body and forms antenna assembly, and therefore, it is possible to is attached sky easily Line apparatus.

The beneficial effect of the invention

According to the disclosure, it is provided that a kind of excellent and antenna assembly of being easily attached in terms of receptivity.

Accompanying drawing explanation

[Fig. 1] Fig. 1 is the explanatory diagram of the profile instance of the car antenna illustrating the first embodiment according to the disclosure.

The C of the A to Fig. 2 of [Fig. 2] Fig. 2 is that the car antenna illustrating the first embodiment according to the disclosure is in UHF waveband The curve chart of frequency-gain characteristic and form, wherein, the A of Fig. 2 is curve chart, and the B of Fig. 2 is to illustrate when receiving vertical polarization The form of gain characteristic during ripple, and the C of Fig. 2 is to illustrate the form of gain characteristic when receiving vertically polarized wave.

[Fig. 3] Fig. 3 is the explanatory diagram of the arrangement examples illustrating the car antenna according to the disclosure the first embodiment.

[Fig. 4] Fig. 4 A and Fig. 4 B is the song of the reception characteristic of the car antenna illustrating the first embodiment according to the disclosure Line chart, wherein, Fig. 4 A is the curve chart illustrating the C/N ratio in the signal received by conventional films antenna, and Fig. 4 B be illustrate by C/N ratio in the signal that the car antenna of the disclosure receives.

[Fig. 5] Fig. 5 is the profile instance of the car antenna of the variation 1 illustrating the first embodiment according to the disclosure Explanatory diagram.

The C of the A to Fig. 6 of [Fig. 6] Fig. 6 is the car antenna of the variation 1 illustrating the first embodiment according to the disclosure At the curve chart of frequency-gain characteristic and the form of UHF waveband, wherein, the A of Fig. 6 is curve chart, and the B of Fig. 6 is to illustrate when receiving The form of gain characteristic during vertically polarized wave, and the C of Fig. 6 is to illustrate the table of gain characteristic when receiving vertically polarized wave Lattice.

[Fig. 7] Fig. 7 is the profile instance illustrating the car antenna in the variation 2 according to the disclosure the first embodiment Explanatory diagram.

The C of the A to Fig. 8 of [Fig. 8] Fig. 8 is the car antenna of the variation 2 illustrating the first embodiment according to the disclosure At the curve chart of frequency-gain characteristic and the form of UHF waveband, wherein, the A of Fig. 8 is curve chart, and the B of Fig. 8 is to illustrate when receiving The form of gain characteristic during vertically polarized wave, and the C of Fig. 8 is to illustrate the table of gain characteristic when receiving vertically polarized wave Lattice.

[Fig. 9] Fig. 9 is saying of the profile instance of the car antenna illustrating the variation 3 according to the disclosure the first embodiment Bright figure.

[Figure 10] Figure 10 is the explanatory diagram of the profile instance illustrating the car antenna according to the disclosure the second embodiment.

[Figure 11] Figure 11 is the profile instance of the car antenna of the variation illustrating the second embodiment according to the disclosure Explanatory diagram.

The C of the A to Figure 12 of [Figure 12] Figure 12 is the vehicle-mounted sky of the variation illustrating the second embodiment according to the disclosure Line is at the curve chart of the frequency-gain characteristic of UHF waveband and form, and wherein, the A of Figure 12 is curve chart, and the B of Figure 12 is to illustrate to work as Receive the form of gain characteristic during vertically polarized wave, and the C of Figure 12 is to illustrate the gain characteristic when receiving vertically polarized wave Form.

Detailed description of the invention

In the following, it is described that embody the preferred implementation of the disclosure.Provide description in the following order.

1. the first embodiment example (example that wherein antenna element and earth element connect via substrate)

2. the variation of the first embodiment

The variation 1 (example that wherein antenna element is configured by substrate) of 2-1. the first embodiment

The variation 2 of 2-2. the first embodiment (wherein antenna element configured by substrate and J-type antenna by with connect The example of the grounded parts configuration that ground element is different with antenna element)

The variation 3 of 2-3. the first embodiment (which provided multiple antenna element and shares and have earth element The example of connection member)

3. the second embodiment example (example that wherein earth element is configured by bar antenna)

The variation of 3-1. the second embodiment (which provided the reality of multiple earth element configured by bar antenna Example)

The most various variation

<1. the first embodiment example>

Fig. 1 is the schematic diagram of the profile instance of the car antenna illustrating the first embodiment according to the disclosure.Shown in Fig. 1 Car antenna 1 include antenna element 10, high frequency transmission line 20, earth element 30 and the coaxial line 40 as antenna cable.? In present embodiment, antenna element 10 is configured by conductor material (such as metal bar), and antenna element 10 is connected to lead to Cross the signal pattern (holding wire) 21 of the high frequency transmission line 20 of ground connection complanar line configuration.Complanar line is that wherein holding wire and ground connection are led Body is present in the transmission line on same plane.

As it has been described above, in high frequency transmission line 20, employ ground connection complanar line, and at the base being made up of plate-like dielectric Plate 21 directly on a surface or signal pattern 22 and earth conductor 23 are set via dielectric film.At signal pattern 22 and earth conductor Between 23, the slit 24 for line style gap with proper width is set.Earth conductor 23 is also formed on the back side of substrate 21, And generally it is connected with earth conductor 23 on the top via through hole etc., and is configured to as ground.By connecing Ground complanar line configuring high-frequency transmission line 20, the dielectric loss of substrate is suppressed to the lowest, and therefore, it can allow by antenna element The high-frequency signal that part 10 receives does not has and passes through damply.

The earth conductor 23 that the earth element 30 configured by conductor material (such as metal bar) is connected on substrate 21.Utilize This configuration, antenna is configured by antenna element 10 and earth element 30.By by the length of antenna element 10 and earth element 30 The total length of length be set to about to expect λ/2 of the frequency received so that can receive desired by car antenna 1 Frequency.It requires, in fact, suitably regulate unit according to material, the material of earth element 30 and the reception frequency of antenna element 10 Part.In the present embodiment, such as, by the length of antenna element 10 being set to 13cm, and by the length of earth element 30 Degree is set to 10cm, and antenna is configured to receive the frequency in UHF waveband.

In the opposition side of the side that antenna element 10 is connected to, the heart yearn 41 of coaxial line 40 is connected to the signal on substrate 21 The end of pattern 22, and the external conductor 43 of coaxial line 40 is connected to the end of earth conductor 23.In other words, at coaxial line The tip portion of 40, protective cover (protective covering) 44 and external conductor 43 are removed from coaxial line 40, to realize it The state that middle electrolyte 42 and heart yearn 41 are exposed.The load point FP of the car antenna 1 according to present embodiment is wherein antenna Element 10 is in FIG from the part that earth conductor 23 is prominent along direction to the left.In other words, at antenna element 10 and signal In the part that pattern 22 connects, form load point FP.

The connection member of the part of high frequency transmission line 20 it is connected to as antenna element 10, earth element 30 and coaxial line 40 50 are moulded by resin 51 (such as lactoprene).In other words, resin 51 is formed to cover substrate 21, signal pattern 22 and Earth conductor 23.In the opposition side of the side being connected to connection member 50, coaxial connector 45 is attached to the end of coaxial line 40.

Additionally, the FERRITE CORE 60 as high frequency attenuation component is arranged in a part for coaxial line 40.By arranging FERRITE CORE 60, will not sense (induce) from FERRITE CORE 60 to coaxially connecting on the external conductor 43 of concentric conductor 40 Connect the radio wave of device 45.Therefore, antenna element 10 picture current received and noise flow through external conductor 43 from connecting portion Part 50 is to FERRITE CORE 60.In other words, this part is used as the ground connection of antenna element 10.Accordingly it is possible to prevent be used as antenna The external conductor 43 of coaxial line 40 sense the radio wave of undesired frequencies.

Additionally, because the part as the ground connection of antenna extends, so improving the reception characteristic of antenna element 10.Assume The frequency etc. received according to expectation can by arrange on coaxial line 40 FERRITE CORE 60 position (to connection member 50 away from From) it is adjusted to any position.In the present embodiment, by and connecting portion 50 be spaced the position of 7 centimetres and ferrite be set Core 60, can remove noise and the picture current of sensing on antenna element 10 most effectively.

Additionally, as it has been described above, the load point FP of car antenna 1 is configured in signal pattern 22 and the antenna of wherein substrate 21 The position that element 10 connects.By the length adjustment load point FP's of the on position of ferrite core 60 and antenna element 10 Impedance so that may determine that reception frequency.

The C of the A to Fig. 2 of Fig. 2 show the frequency when the car antenna 1 shown in Fig. 1 receives the broadcast in UHF waveband- Gain characteristic.As the coaxial line 40 shown in Fig. 1, use the coaxial line with 3m length.The A of Fig. 2 is curve chart, and the B of Fig. 2 Data are shown with the C of Fig. 2.Trunnion axis in the A of Fig. 2 represents frequency (MHz), and vertical axis represents peak gain (dBd).Bent Solid line in line chart represents the gain characteristic when receiving horizontal polarized wave, and dotted line represents the increasing when receiving vertically polarized wave Benefit characteristic.The B of Fig. 2 is the data representing the frequency-gain characteristic when receiving vertically polarized wave, and the C of Fig. 2 is to represent connecing The data of frequency-gain characteristic during receipts horizontal polarized wave.As shown in the C of the A to Fig. 2 of Fig. 2,470MHz to 870MHz's UHF waveband, determines and obtains about-10dB or more gain characteristic in horizontal polarized wave (i.e. the main polarization ripple of TV broadcast).

The B of A with Fig. 3 of Fig. 3 shows by the received signal before demodulation compared with the C/N of conventional films antenna ratio C/N ratio (carrier-to-noise ratio).The A of Fig. 3 is shown in car antenna 1 and receives UHF waveband (mid frequency is 475MHz) The curve chart of the C/N ratio of the received signal in the case of signal, and the B of Fig. 3 is to be shown in traditional film antenna to receive The curve chart of the C/N ratio of the received signal in the case of the signal of UHF waveband.As traditional film antenna, use Utilize amplifier so that the level of received signal to increase the film antenna of 15dB.In the B of A and Fig. 3 of Fig. 3, trunnion axis Represent frequency (MHz), and vertical axis represents signal level (dBm).

As shown in the A of Fig. 3, in the signal received by the car antenna 1 according to present embodiment, background noise is by void Value near the-122dBm that line represents, and signal level is the value near the-105dBm represented by length alternately and dash line. In contrast, in the signal received by traditional film antenna, it is attached that signal level increases to the-88dBm as shown in the B of Fig. 3 Closely.It is known, however, that together with signal level, background noise also increases near-108dBm.In other words, at the B of Fig. 3 In, represented by the interval between length and the dotted line of dash line and expression signal level alternately of expression background noise level C/N ratio, with the C/N of the car antenna 1 shown in the A of Fig. 3 than the most different.At some frequency, shown in the A of Fig. 3 The C/N ratio of car antenna 1 is the best.

Fig. 4 is the schematic diagram illustrating car antenna 1 to the arrangement examples of car body.Such as, use height is received at car antenna 1 In the case of the broadcast (the such as broadcast of all band broadcast) of rank modulating system, can be by arranging two car antennas 1 to hold Row diversity reception improves the reception characteristic of antenna.Fig. 4 is shown in which that two car antennas 1 are respectively disposed at and vehicle The right-hand member of the instrument board 102 that the base (base) of windshield 101 contacts and the example of left end.In left and right car antenna 1, Antenna element 10 is made to extend the most forward, the base of the windshield 101 to be parallel on instrument board 102, and make ground connection Element 30 extends along left side and the right side of windshield 101.

The coaxial connector 45 of the tip portion being arranged on each coaxial line 40 of left and right car antenna 1 is connected to PND200.Inside PND200, receptor 210 is configured and receptor 210 performs diversity reception and demodulates the signal of reception. In the present embodiment, as diversity reception, such as, the maximum-ratio combing system of space diversity is used.Demodulated by receptor 210 Signal show on the screen of display unit 220 including liquid crystal display etc..

By being arranged in such a way car antenna 1, it is positioned at the metallic object of vehicle of the end of windshield 101 with vehicle-mounted The earth element 30 of antenna 1 is capacity coupled, and the ground connection of antenna extends.Therefore, car antenna 1 signal received Level increases, and additionally, also improves reception characteristic in motion.

Car antenna 1 according to present embodiment, by the Capacitance Coupled of earth element 30 with the metal part of car body, sky The part as ground connection of line extends, and therefore so that the reception characteristic equal to or higher than conventional films antenna can be obtained Reception characteristic.Additionally, without antenna being bonded to windshield 101 or rear glass (not shown), and therefore so that permissible Use the hardware with superior electrical conductivity as the original material of antenna element 10.Moreover, it is no longer necessary to antenna is placed In position separate with automobile navigation apparatus or PND200, such as windshield 101 and the upper end of rear glass (not shown), and And and hence it is also possible to reduce the length of antenna cable (coaxial line 40).

Therefore, it is no longer necessary to the sky of the reduction that amplifier makes up the material by antenna element and cable length causes is set Line gain.Therefore, it is no longer necessary to the adapter that use is expensive, such as compatible with amplifier MCX adapter, and therefore, can To reduce manufacturing cost.In addition, may also suppress power consumption.Additionally, only need to place according to the car antenna 1 of present embodiment On instrument board 102, and therefore, user oneself can easily be attached.Therefore, it is no longer necessary to user pays attachment expense With.

Additionally, easily increase the quantity of antenna, and therefore, it can perform diversity reception.Therefore so that can receive complete Band broadcast, and therefore so that even if on the device (such as at PND200) that screen size is relatively large, it is also possible to clear Ground shows high-precision character and image.Even if additionally, increasing the quantity of car antenna 1 to perform the situation of diversity reception Under, car antenna 1 is not placed on the surface of windshield 101, and therefore, is no longer interfere with visuality when driving.Additionally, Need not by antenna attachment outside car body, and therefore, no longer damage the outward appearance of vehicle.

In the above-described embodiment, the antenna element 10 of car antenna 1 and earth element 30 are placed on the instrument board of vehicle On 102 but it also may fixed by holder (clamper) etc..

Additionally, in the above-described embodiment, antenna element 10 and earth element 30 are via being configured by ground connection complanar line High frequency transmission line 20 connects, but is not limited thereto.It is used as another kind of high frequency transmission line, such as microstrip line.Alternately, Antenna element 10 and earth element 30 may be coupled directly to coaxial line 40, and without using high frequency transmission line 20, in this situation Under, antenna element 10 is connected to the heart yearn 41 of coaxial line 40, and earth element 30 is connected to the external conductor 43 of coaxial line 40.

In the layout example shown in Fig. 4, give the reality being provided with two car antennas 1 to perform diversity reception Example, but may also set up the car antenna 1 of another quantity, such as four.Applying in the case of not performing diversity reception is also can Utilize, and in this case, only use a car antenna 1.

<the 2. variation of the first embodiment>

Then, with reference to Fig. 5 to Fig. 9, the configuration to the car antenna 1A of the variation according to above-mentioned first embodiment is real Example illustrates.

[2-1. variation 1]

Fig. 5 is the schematic diagram of the profile instance illustrating variation 1.In Figure 5, identical symbol be affixed to in Fig. 1 The corresponding part of part, and the repetitive description thereof will be omitted.The car antenna 1 shown in car antenna 1A Yu Fig. 1 shown in Fig. 5 Difference be that the substrate that antenna element 10a is made up of Sheet Conductor configures.

Specifically, width is arranged to the same widths (such as 15mm) from the end of two earth conductors 23 to end, And length in a longitudinal direction is arranged to 115mm.Do not have on substrate and the substrate 21 of the ground connection being arranged on the back side The end of signal pattern 22 is connected.The end of signal pattern 22 on the base plate (21 refers to heart yearn 41 or the ground connection unit of coaxial line 40 The side that part 30 is not connected to.Utilize this configuration, compare the area of car antenna 1 as described in the first embodiment, it is possible to more How to increase the area of antenna element 10a.In the present embodiment, the part that antenna element 10a is connected with substrate 21 is by resin Housing 51a covers.

The C of the A of Fig. 6 to 6 is to illustrate the frequency when the car antenna 1A of present embodiment receives the broadcast in UHF waveband The curve chart of rate-gain characteristic and form.The length of coaxial line 40 is arranged to 1.5m.The A of Fig. 6 is curve chart, and the B of Fig. 6 Data are shown with the C of Fig. 6.The trunnion axis of the A of Fig. 6 represents frequency (MHz), and vertical axis represents peak gain (dBd).In figure Solid line represent the gain characteristic when receiving horizontal polarized wave, and dotted line represents that the gain when receiving vertically polarized wave is special Property.The B of Fig. 6 is the data representing the frequency-gain characteristic when receiving vertically polarized wave, and the C of Fig. 6 is to represent receiving water The data of frequency-gain characteristic during flat polarized wave.As shown in the C of the A to Fig. 6 of Fig. 6, particularly 570MHz's to 770MHz Wave band, determines and all obtains about-10dB or more gain characteristic in vertically polarized wave and horizontal polarized wave.In other words, The known gain characteristic (seeing the C of the A to Fig. 2 of Fig. 2) comparing car antenna 1 as described in the first embodiment, significantly carries High reception characteristic.

Here, the width providing wherein antenna element 10a is set and identical to end of the end from earth conductor 23 The example of width, but this is not limited thereto.This is wider for width comparable, and if widen, then the electric current of different frequency flows through Antenna element 10a, and therefore, it can improve further especially in the reception characteristic of high frequency side.

[2-2. variation 2]

Fig. 7 is the schematic diagram of the profile instance of the variation 2 of the first embodiment illustrating the disclosure.In the figure 7, identical Symbol be affixed to the part corresponding with those in Fig. 1 and Fig. 6, and the repetitive description thereof will be omitted.Vehicle-mounted shown in Fig. 7 The earth conductor 23 that the difference of the car antenna 1A shown in antenna 1B with Fig. 6 is on substrate 21 extends and arranges and connect The second earth element 30a that ground element 30 is different.

Second earth element 30a is placed in parallel to antenna element 10b, and separates predetermined with antenna element 10a Interval, and the length that the length of its longitudinal direction is made into than antenna element 10b is shorter.Utilizing this configuration, J-type antenna leads to Cross antenna element 10a and the second earth element 30a configuration.

By regulating the length of the second earth element 30a and arriving the distance of antenna element 10a, antenna element 10a connecing The picture current at frequency received begins flow through the second earth element 30a.Therefore so that desired electric wave and image can be obtained The signal sum of electric current is as the signal received at load point, and it is thus possible to increase the level of received signal.Change Sentence is talked about, and can improve the receiving sensitivity of antenna.For concrete size, such as, in the situation of the signal receiving UHF waveband Under, the length and width of antenna element 10a is separately arranged as 130mm and 8mm, and the length of the second earth element 30a and Width is respectively set to 85mm and 3mm.Subsequently, the interval between antenna element 10a and the second earth element 30a is set, So that the signal received by antenna element 10a and the second earth element 30a respectively can be separated from one another.

The C of the A to Fig. 8 of Fig. 8 is to illustrate the frequency when the car antenna 1B of present embodiment receives the broadcast in UHF waveband The curve chart of rate-gain characteristic and form.The length of earth element 30 is arranged to 100mm, and the length quilt of coaxial line 40 It is set to 1.5m.The A of Fig. 8 is curve chart, and the C of B and Fig. 8 of Fig. 8 shows data.The trunnion axis of the A of Fig. 8 represents frequency , and vertical axis represents peak gain (dBd) (MHz).Solid line in curve chart represents that the gain when receiving horizontal polarized wave is special Property, and dotted line represent receive vertically polarized wave time gain characteristic.The B of Fig. 8 is to represent the frequency when receiving vertically polarized wave The data of rate-gain characteristic, and the C of Fig. 8 is to represent the data of frequency-gain characteristic when receiving horizontal polarized wave.Such as Fig. 8 A to Fig. 8 C shown in, in the part of altofrequency the most about 670MHz to 750MHz, determine in vertically polarized wave and level pole Change and ripple all obtains about-8dB or more gain characteristic.Particularly in horizontal polarized wave, it is thus achieved that-5dB or more Advantageous feature.In other words, it is known that compare the gain characteristic of the car antenna of above-mentioned each embodiment, improve significantly Receive characteristic.

For the car antenna 1B of present embodiment, also carry out on-the-spot test to assess its behavior in service.By passing The film antenna of system and the car antenna 1B of present embodiment be attached on a car and make its cross the faint region of electric field and Building radio wave below is faint and the region that is attenuated is to carry out on-the-spot test.Subsequently, by watching and listening to respectively The image of the predetermined BW broadcasting wave received by two antennas, checks how block noise (block noise) occurs in image.Change Sentence is talked about, and compares and produces the length at interval of block noise, the mode etc. of produced block noise appearance.Carry out the district of on-the-spot test The east in territory is around Ishikawa, land for growing field crops district, Tokyo (the Tokyo Tower about 10km away from sending BW broadcasting wave), and western end is new around Musashi City, Zhongyuan District, Kawasaki city (with the east at a distance of about 5km on southwestward).The North is around Naha city, generation Tian Guqu, and south End is around Shinmaruko, Zhongyuan District, Kawasaki city.

As film antenna, it is provided with two antennas to perform diversity reception, and antenna is glued to the glass that keeps out the wind respectively The upper right portion of glass and upper left.On the other hand, similarly, two car antenna 1B (seeing Fig. 7) are set and cloth respectively Put in the right part of instrument board and left part, and make each earth element 30 extend along the left and right pillar of car body.Receive Channel is that (physical channel: UHF waveband 20ch, mid frequency: 515MHz send output: 3kW) to TOKYO MX.Carry out on-the-spot survey The weather on the same day of examination is fine.

As the result of on-the-spot test, around Shinmaruko, Musashinakahara and Musashishinjo In house street, for the car antenna 1B of film antenna and the disclosure, the mode that block noise occurs in image is essentially identical. In contrast, in the part from the beautiful river IC to the rugged IC of capital creek of great San Jingbang highway, from the Ishikawa of national highway 312 to beautiful river IC's Region, and from the Ishikawa of national highway 311 region to Shinmaruko, for the car antenna 1B of the disclosure, occur less Block noise.In other words, it is determined to receive characteristic more excellent than the reception characteristic of film antenna.Additionally, vehicle-mounted in the disclosure In the case of antenna 1B is placed on distance pillar 10cm, it is possible to obtain essentially identical reception characteristic.

In other words, according to present embodiment, it is thus achieved that with the effect of the car antenna according to above-mentioned each embodiment The effect of equivalence, and further improve the reception characteristic of antenna.

In the configuration shown in Fig. 7, give the side and second that wherein antenna element 10a is placed on coaxial line 40 and connect Ground element 30a is placed on the example above antenna element 10a, but this is not limited thereto, and acceptable layout in contrast. In other words, the second earth element 30a can be placed in the side of coaxial line 40, and antenna element 10a can be placed in second and connects Above ground element 30a.

[2-3. variation 3]

Then, with reference to Fig. 9, the profile instance of car antenna 1C according to modified embodiment of the present embodiment 3 is described.At Fig. 9 In, identical symbol is affixed to the part corresponding to those in Fig. 1, Fig. 5, Fig. 7, and the repetitive description thereof will be omitted.Fig. 9 institute The car antenna 1C shown has and which provided two antenna elements and the second earth element being made up of linear metal parts 30 configurations shared by two antenna elements.Antenna element 10-1 and antenna element 10-2 is arranged to towards different directions, So that the dependency of reception state between two antennas is the least.

Two groups of signal patterns 22 it are provided with on substrate 21b, and earth conductor 23 and antenna element 10-1 and antenna element Part 10-2 is connected respectively to different signal patterns 22.Subsequently, in the side not being attached antenna element of signal pattern 22, single Solely it is provided for the coaxial line 40-1 of antenna element 10-1 and for the coaxial line 40-2 of antenna element 10-2.

Utilize this configuration, even if in the case of two antenna elements of needs are to perform diversity reception, it is only necessary in instrument Car antenna 1C is placed on the side of plate (not shown).Even if additionally, in the feelings using four antenna elements to perform diversity reception Under condition, the most only need to place two car antenna 1C on the both sides of instrument board.Car antenna 1C according to present embodiment, can The effect of the equivalent to obtain and obtained in above-mentioned each embodiment.

In the present embodiment, give wherein antenna element 10-1 and antenna element 10-2 by identical component (metal Component) example that configures, but this is not limited thereto.For example, it is also possible to by substrate configuration two antenna elements in wherein One, and configured another by metal line materials.Now, by arranging the antenna element that configured by substrate so that its relative to Instrument board is level, and by configured another antenna by line style hardware and arrange this antenna element so that its vertically Hold up, it is possible to reduce the degree of correlation between two antenna elements.

<3. the second embodiment example>

Then, the profile instance of the car antenna of the second embodiment according to the disclosure is described with reference to Figure 10.At Figure 10 In, identical symbol is affixed to those the corresponding parts with Fig. 1, Fig. 5, Fig. 7 and Fig. 9, and the repetitive description thereof will be omitted. In the car antenna 1D according to present embodiment, antenna element 10b and earth element 30b is joined by bar antenna (bar antenna) Put.

As the bar antenna as earth element 30b, such as, wherein antenna part and supporting part (phase para-position are used Put) angle that formed can be adjusted to the type of any angle.Antenna element 10b and earth element 30b is via above-mentioned height Frequently transmission line (not shown) etc. are connected, and coupling part is covered by resin-case.In the present embodiment, earth element The coupling part of the substrate with high frequency transmission line of 30b is provided with rotating mechanism 31, and rotating mechanism 31 includesThe earphone of 3.5 is inserted Hole (earphone jack), and by earth element 30b is inserted in rotating mechanism 31 so that can be by earth element The 30b angle adjustment relative to antenna element 10b is to any angle.

Utilize this configuration so that can by rotate earth element 30b by earth element 30b and car body (not shown) it Between be intervally adjusted to any interval.In other words, earth element 30b can be placed on wherein earth element 30b and car body Between the Capacitance Coupled that occurs be most suitable position, and therefore so that antenna performance can be improved easily.This Outward, by the angle adjustment of earth element 30b to pillar relative to any angle of ground connection, and can therefore, it can vehicle-mounted Antenna 1D is attached to any car body.In the present embodiment, give the example that wherein rotating mechanism 31 is formed by earphone jack, But this is unrestricted, and special rotating mechanism 31 can also be formed.In addition it is also possible to use be configured to rotate, The bar antenna extended and shrink, the bar antenna for watching and listening to single band broadcast in such as mobile phone.

[3-1. variation]

Can also by wherein antenna element 10b as shown in Figure 10 and earth element 30b by bar antenna configure vehicle-mounted Antenna 1D is configured to J-type antenna.The profile instance of car antenna 1E arranged as described above figure 11 illustrates.As in the figure 7 Shown configuration, arranges the second earth element 30c separated with earth element 30b.Subsequently, the second earth element 30c is placed For be parallel to antenna element 10b and and antenna element 10a separate predetermined interval, and its length in a longitudinal direction is made The length becoming than antenna element 10b is short.

Utilize this configuration, can make to flow through the second ground connection unit at the picture current of the frequency received by antenna element 10a Part 30c, and simultaneously, make the electric current of the length corresponding to earth element 30c also move at antenna element effluent, and therefore, make Obtain and can extend receivable wave band.

The C of the A to Figure 12 of Figure 12 shows when the car antenna 1E (seeing Figure 11) of present embodiment receives at UHF ripple The curve chart of frequency-gain characteristic during the broadcast of section and form.The length of earth element 30 is arranged to 120mm, and same The length of axis 40 is arranged to 1.5m.Additionally, the length of antenna element 10b is arranged to 130mm, the second earth element 30c The length angle that is arranged between 85mm, and antenna element 10b and the second earth element 30c be arranged to 135 °.

The A of Figure 12 is curve chart, and the C of B and Figure 12 of Figure 12 shows data.The trunnion axis of the A of Figure 12 represents frequency , and vertical axis represents peak gain (dBd) (MHz).Solid line in figure represents the gain characteristic when receiving horizontal polarized wave, and Dotted line represents the gain characteristic when receiving vertically polarized wave.The B of Figure 12 is to represent the frequency-increasing when receiving vertically polarized wave The data of benefit characteristic, and the C of Figure 12 is to represent the data of frequency-gain characteristic when receiving horizontal polarized wave.A such as Figure 12 To shown in Figure 12, the particularly HFS near 670MHz to 750MHz, determine at vertically polarized wave and horizontal polarized wave In all obtain about-8dB or more gain characteristic.In other words, although with the gain characteristic shown in the C of the A to Fig. 8 of Fig. 8 Compare superiority slightly worse, but known obtain the reception characteristic of other car antenna being not configured to J-type than the disclosure more Excellent characteristic.

<the most various variation>

In above-mentioned each embodiment, wherein car antenna 1 is received UHF waveband radio wave situation as One example, but this is not restricted by.Each embodiment can also be applied to receive the antenna of such as VHF wave band.

Additionally, in above-mentioned each embodiment, give the example that wherein car antenna 1 does not have amplifier, but also Amplifier can be set on the high frequency transmission line 20 be configured to complanar line.By arranging amplifier, it is inserted into amplifier The front and back of part in terms of high frequency on and therefore separated, it is no longer necessary to FERRITE CORE 60 is inserted into coaxially In line 40.

Additionally, in above-mentioned each embodiment, give wherein car antenna 1 and guider (such as PND200) warp The example connected by coaxial line 40, but car antenna 1 may be incorporated in PND200.For example, it is also possible to design wherein antenna element It is embedded in part above the display screen of housing etc. and earth element 30 optional turn is arranged on upper right or a left side for housing The configuration of upper part.

Additionally, in above-mentioned each embodiment, give wherein car antenna 1 and be connected to guider (such as PND200) example, but this is not restricted by, it is also possible to and configuration car antenna 1 is so as to be attached to portable unit, such as Mobile telephone terminal and tablet terminal.In this case, such as, it is only necessary to earth element 30 is inserted into terminal, the most micro- Type USB (USB microterminal), and it is also possible that with arranging the antenna of terminal as standard set-up, and it is not provided with antenna element 10。

Additionally, the disclosure can also configure as follows.

(1)

A kind of antenna assembly, including:

Antenna element, is configured to receive broadcast wave and the signal being superimposed upon on BW broadcasting wave and being sent subsequently；

Earth element, has predetermined length, and this earth element is configured to adjust relative relative to antenna element Position；And

Feed-in parts, antenna element and earth element are connected to this feed-in parts, and connect by antenna element from its acquirement The signal received.

(2)

According to the antenna assembly described in (1),

Wherein, antenna element and earth element are formed by conductive member.

(3)

According to the antenna assembly described in (1) or (2),

Wherein, the electricity occurred between the metal part of earth element and the car body of the vehicle being wherein mounted with antenna assembly The size of the coupling electric capacity holding coupling changes according to the relative position relation between earth element and antenna element.

(4)

According to the antenna assembly described in any one in (1) to (3),

Wherein, with the total length radio wave that essentially expectation receives of the length of antenna element and the length of earth element The mode of λ/2 of wavelength adjust antenna element and earth element length in a longitudinal direction.

(5)

According to the antenna assembly described in any one in (1) to (4), farther include:

Second earth element, is arranged to be basically parallel to antenna element, and the second earth element has than antenna element Length that length is short and be connected to feed-in parts.

(6)

According to the antenna assembly described in any one in (1) to (4),

Wherein, coaxial line is connected to feed-in parts, and antenna assembly farther includes different from antenna element Two antenna elements.

(7)

According to the antenna assembly described in any one in (1) to (6),

Wherein, antenna element and the second antenna element are with the different direction of antenna element and the second antenna element face each other Mode arrange.

(8)

According to the antenna assembly described in any one in (1) to (7),

Wherein, antenna element is connected to the conductive component with the substrate of conductive component and grounded parts, the conduction of substrate Parts include the first conductive component for antenna element and the second conductive component for the second antenna element, the first conductive part Part is connected to coaxial line, and the second conductive component is connected to second coaxial line different from coaxial line.

(9)

According to the antenna assembly described in any one in (1) to (4),

Wherein, coaxial line is connected to feed-in parts, and the high frequency attenuation parts being configured to decay high frequency electric are set Put the part at coaxial line.

(10)

According to the antenna assembly described in any one in (1) to (4),

Wherein, antenna element is connected to the conductive component with the substrate of conductive component and grounded parts, and ground connection unit Part is connected with the grounded parts of substrate.

(11)

According to the antenna assembly described in any one in (1) to (4),

Wherein, antenna element is connected to the heart yearn of coaxial line, and earth element is connected to the external conductor of coaxial line.

Symbol description

1,1A, 1B, 1C, 1D, 1E car antenna

10,10-1,10-2,10a, 10b antenna element

20 high frequency transmission lines

21 substrates

22 signal patterns

23 earth conductors

24 slits

30 earth elements

30a the second earth element

30b earth element

30c the second earth element

31 rotating mechanisms

40 coaxial lines

40-1,40-2 coaxial line

41 heart yearns

42 electrolytes

43 external conductors

44 protective covers

45 coaxial connectors

50 connection members

51 resins

51A resin-case

60 FERRITE CORE

101 windshield

102 instrument boards

200 PND

210 receptors

220 display units

Claims (10)

1. an antenna assembly, including:

Antenna element, is configured to the signal receiving BW broadcasting wave and being superimposed upon on described BW broadcasting wave；And

Earth element, has predetermined length, and described earth element is configured to adjust relative to described antenna element Position relatively；And

Wherein, couple between described earth element with the metal part of the car body of the vehicle being mounted with described antenna assembly Electric capacity is so that the area of grounded part of described antenna assembly increases, and the size of described coupling electric capacity depends on described ground connection Relative position relation between element and described antenna element.

Antenna assembly the most according to claim 1,

Wherein, the total length with the length of described antenna element and the length of described earth element is the radio wave that expectation receives Wavelength 1/2 mode adjust described antenna element and described earth element length in a longitudinal direction.

Antenna assembly the most according to claim 2, farther includes:

Feed-in parts, described antenna element and described earth element are connected to described feed-in parts, and from described feed-in parts Obtain the described signal received by described antenna element；And

Second earth element, is arranged to be parallel to described antenna element, and described second earth element has than described antenna element Length that the length of part is shorter and be connected to described feed-in parts.

Antenna assembly the most according to claim 3,

Wherein, coaxial line is connected to described feed-in parts, and described antenna assembly farther includes to be different from described antenna element Second antenna element of part.

Antenna assembly the most according to claim 4,

Wherein, described antenna element and described second antenna element with described antenna element and described second antenna element towards that The mode in this different direction is arranged.

Antenna assembly the most according to claim 5,

Wherein, described antenna element is connected to the described conductive component with the substrate of conductive component and grounded parts, described base The described conductive component of plate include the first conductive component for described antenna element and for described second antenna element Two conductive components, described first conductive component is connected to described coaxial line, and described second conductive component is connected to be different from Second coaxial line of described coaxial line.

Antenna assembly the most according to claim 4,

Wherein, in a part for described coaxial line, setting is configured to the high frequency attenuation parts of decay high frequency electric.

Antenna assembly the most according to claim 2,

Wherein, described antenna element is connected to the conductive component with the substrate of conductive component and grounded parts, and described in connect Ground element is connected to the described grounded parts of described substrate.

Antenna assembly the most according to claim 4,

Wherein, described antenna element is connected to the heart yearn of described coaxial line, and described earth element is connected to described coaxial line External conductor.

10. a navigator, including according to the antenna assembly according to any one of claim 1-9.