WO2009101750A1 - Loop antenna and immunity test method - Google Patents

Loop antenna and immunity test method Download PDF

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Publication number
WO2009101750A1
WO2009101750A1 PCT/JP2008/072937 JP2008072937W WO2009101750A1 WO 2009101750 A1 WO2009101750 A1 WO 2009101750A1 JP 2008072937 W JP2008072937 W JP 2008072937W WO 2009101750 A1 WO2009101750 A1 WO 2009101750A1
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WO
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Patent type
Prior art keywords
annular conductor
conductor
loop antenna
annular
magnetic field
Prior art date
Application number
PCT/JP2008/072937
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French (fr)
Japanese (ja)
Inventor
Norio Masuda
Original Assignee
Nec Corporation
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/12Supports; Mounting means
    • H01Q1/22Supports; Mounting means by structural association with other equipment or articles
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/36Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop

Abstract

Provided is a loop antenna capable of accurately identifying circuits and components having low immunity performances. The loop antenna is provided with a first ring-shaped conductor and one or more second ring-shaped conductors smaller than the first ring-shaped conductor and disposed inside the ring of the first ring-shaped conductor. The first ring-shaped conductor and the second ring-shaped conductors are connected in series and disposed in the same plane. In this case, in the area surrounded by the first ring-shaped conductor and the second ring-shaped conductors, the direction of a magnetic field generated by the first ring-shaped conductor is opposite to those generated by the second ring-shaped conductors.

Description

Loop antenna and immunity test methods

The present invention relates to a loop antenna, particularly to a compact loop antenna to perform communication by generating an antenna or a magnetic field, testing the electromagnetic susceptibility and immunity performance by irradiating a magnetic field.

When the electronic apparatus is operated, the electromagnetic field is reached that occurs with the operation of other electronic devices and mechanical devices, that the electromagnetic field causes electromagnetic interference, electromagnetic interference: cause (EMI Electromagnetic Interference), the electronic equipment performance it is possible to generate degradation. On the other hand, in an environment where there is such an electromagnetic interference, improve the immunity that can operate without the electronic device is decreased performance, in order to prevent the performance degradation due to electromagnetic interference, at the design stage of the electronic device, identify the electromagnetic susceptibility strong position to elucidate the mechanism of electromagnetic interference, it is important to design with improved immunity.

For electromagnetic susceptibility to identify the weak points, large scale integrated circuits (LSI) or a printed wiring board (PWB: Printed Wiring Board) by installing an antenna in the vicinity of the irradiation with the electromagnetic field, the generation and degradation of malfunctions examine the state test has been carried out. Such tests help identify electromagnetic immunity weak circuits and mounted parts.

Figure 11 is a configuration example in evaluating immunity performance by installing an antenna for radiating a magnetic field just above the LSI.

11A is a diagram viewed from above the LSI, the antenna 10 is directly above the QFP (Quad Flat Pack) 1 that LSI is mounted, is installed to be constant height from QFP 1. In the example of FIG. 11A, the antenna 10 is fabricated in a multilayer substrate, the loop wiring 11 for generating a magnetic field is formed by printed wiring. Figure 11B is a view of the same structure as that of FIG. 11A from the side. Peripheral circuits required for the on mount board 5 for operating the LSI has also been implemented. Circuitry for on top mounting board 5 for monitoring the operation of the LSI is also implemented.

In FIG. 1, 2 tip portion of the QFP 1, 3 is a lead frame QFP 1.

Antenna 10, as shown in FIG. 12, it consists of the loop wire 11 and the lead 12 and a connector 14 that is formed by printed wiring on the printed wiring board 13. RF signal sent from the signal generator 17, the coaxial cable 16, connector 14, is transmitted by a lead 12, it is ultimately fed to the loop line 11. Although the periphery of the loop line 11 produces a magnetic field around the loop plane in accordance with the laws of electromagnetism, this time, the magnetic field in the direction perpendicular to the loop plane is dominant are common. Accordingly, as shown in FIG. 11B, when placed at an appropriate distance so as to be parallel to the QFP that is mounted on a mounting board 5 the antenna 10, to irradiate the low magnetic field strength varies over the entire surface of the QFP it can. Signal generator 17 sets the magnetic field intensity and modulation for generating change of, while controlling the waveform to determine the cause of the LSI malfunctions. In FIG. 11A, but using substantially the same size as the antenna and QFP, some test methods for irradiating a limited extent by using a smaller antenna than QFP. In this case, while scanning over the QFP small antennas at a predetermined height by irradiating a magnetic field, immunity to identify the weak circuit.

Figure 13 is an explanatory diagram of a method of measuring the magnetic field of the surface of the antenna 10 of Figure 12 with a small magnetic field probe 15. FIG. 13A, as shown in B, a small magnetic field probe 15 to measure the magnetic field while scanning in the XY-axis direction loop wiring 11 of constant placed near height, visualized figure diagrams 14A. In Figure 14A, the magnetic field of the loop line 11 near the X, Y, because it has a Z-direction component, while changing the installation shaft of a small magnetic field probe 15, X-direction component (Hx), Y direction component (Hy), Z-direction the intensity of the component (Hz) was measured, Hxyz = (x 2 + y 2 + z 2) (1/2) are displayed combined and at.

The measurement was performed by connecting a small magnetic field probe 15 to the measuring instrument such as a spectrum analyzer, and the antenna 10 is oscillated by measuring the output of a small magnetic field probe 15 in 10 MHz. Figure 14A, which displays the results of measurement by scanning a small magnetic field probe 15 over the loop entirely in (b). Figure 14A, at (b), the center of the loop line 11 has a (x, y) = (18mm, 18mm). The outer shape of the loop line 11 in FIG. 13B, 24 mm square, the width of the loop wire 11 is 1 mm, as measured away 6mm a miniature magnetic field probe 15. In Figure 14A, it can be seen that a strong magnetic field is generated over the entire surface in a range surrounded by the loop line 11. Figure 14B, Y, as constant Z coordinate, the results of measuring the magnetic field while scanning one-dimensionally the A-A 'line passing through the center of the loop line 11 in FIG. 13B. The position of X = 18 mm in FIG. 14B, which means that the center of the loop wiring 11 is small magnetic field probe 15. Although asymmetry due to an error in measurement is recognized, it is substantially symmetrical distribution.

As seen from FIG. 14B, Hz predominates in the area surrounded by the loop line 11. Although near the loop line 11 is also the region where Hx is increased, its strength is low compared to Hz. Measured distance of a small magnetic field probe 15 is further reduced, but Hx becomes smaller than 1mm can sometimes become dominant compared to Hz, taking into account the distance between the loop and the object in a state that is normal use Then, the distribution shape of FIG. 14A is a typical distribution. Since Hy is in principle it is in the direction not observed magnetic field, has a very low value. x, y, the magnitude of Hxyz a combined magnetic field in the z-direction = (x 2 + y 2 + z 2) (1/2) is similar to generally Hz distribution, Hxyz in the region where Hx is strong There is larger than Hz. Therefore, in the case of FIG. 14B, Hxyz is substantially of Hz and Hx synthesis. In the region surrounded by the loop line 11, the intensity variation of the resultant magnetic field Hxyz less, has remained change of about 8%. Note that displays normalized in FIG. 14A, B are both maximum. The loop line 11 made in a size comparable to the QFP, as shown in FIG. 11A, when placed on the QFP, can be irradiated with substantially magnetic field of a constant intensity over the QFP entire surface.

Figure 15A illustrates schematically a test method for irradiating a magnetic field described above. A region where the shaded area to generate a strong magnetic field, the inside of the loop line 11 belongs substantially to the region. And changing the distance QFP1 and the antenna 11 also changes the distribution type, but to carry out the tests at nearby made such measurement distance uniform distribution is generally used. In detail, when the antenna 10 is very close to the LSI chip 1 and the lead frame 3 to be tested generates strong magnetic field only in the vicinity of the loop wiring 11, the magnetic field intensity at the center portion of the loop wire 11 is low. In other words, an annular magnetic field distribution occurs. However, in the case of QFP, because of the thickness of the package, the loop wiring 11 placed forced away from the chip 1 and the lead frame 3. In this case, the magnetic field near the center of the loop wire 11 becomes strong, as a result, a strong magnetic field is generated in the loop plane illustrated in FIG. 14A. Therefore, to generate the magnetic field of the annular changing the installation distance of the antenna 10, the constraint is large.

In the above, a case has been exemplified to be tested by irradiating the magnetic field, using the antenna to generate a uniform electric field can be applied to the malfunction test by the electric field.

In Figure 15A, since the result is irradiated field over the QFP1 entire surface, it is possible to evaluate the overall immunity QFP1, it can not be evaluated for each component. As shown in FIG. 15B, it is possible to irradiate the magnetic field only to the chip 2 that LSI is formed by creating a loop line 11 outside dimensions are small, the connection pads of the lead frame 3, QFP 1 and the chip it is impossible to irradiate the magnetic field only the bonding wires 4. In particular, in the following frequency bands 1 GHz, the noise is caused by the lead frame 3 and the bonding wires 4 by electromagnetic fields coming from outside, in some cases greater than the noise generated inside the chip 2 by the same external electromagnetic field. In this case, the noise occurring in the lead frame 3 and the bonding wires 4 becomes conductive noise, to cause contamination malfunctioning from the terminal unit in the chip 2, even the measures electromagnetic field does not penetrate from the outside into the chip 2 effect can not be expected. Therefore, by performing a test by selecting the lead frame 3 and the bonding wires 4 is important to select the correct noise suppression.

Figure 15C shows a case where the bonding wire 4 and the bonding wire 4 makes a magnetic field irradiation test by selecting the portion (i.e. the portion that tapers to a lead frame 3) which is connected to the lead frame 3, FIG. 15D, mounting even including wiring 6 on the board 5 is a case of performing a test of irradiating the magnetic field. Thus, by using the magnetic field generation method to produce strong magnetic field in an annular, chip 2, the bonding wires 4, the lead frame 3, it is possible to test a combination of wire 6 on the mounting board, strong electromagnetic susceptibility, it is possible to specify the mounting components which cause the immunity decreased.

Figure 16 is an example of irradiating the magnetic field selected for each circuit. In Figure 16A, instead of the selection of the implementation component level, do all inclusive test components connected to the circuit to be tested. Examples of the circuit, the power supply circuit, a data port, but such I / O port for signal transmission may be mentioned, pin connected to similar circuits often are adjacent on QFP. In that case, as shown in FIG. 16B, for example, the particular lead frame 3 may not want to irradiation.

As described above, in the prior art, it is impossible to irradiate the magnetic field from the outside and select the mounted components and circuits, specific immunity performance is lower circuits and components there is a drawback that can not be made sufficiently.

It will now be described known documents the applicant is aware.

Patent Document 1 includes a first half-loop 3c and the circular loop 3e and a second half-loop 3g connected in series, the first annular consisting of a first half-loop 3c and the second half-loop 3g was formed in the same size and a second annular antenna portion consisting of the antenna portion and a circular loop 3e in the same shape, the loop antenna is disclosed in which are brought into close contact with the antenna portion of the first and second annular.

In Patent Document 1, without the Radio Law of problems have been described as capable of performing the signal electrical transmission. This is believed to be the magnetic field distribution problems in distance field loop antenna occurs is sufficiently synthesized.

Further, FIG. 2C in Patent Document 2, a coil antenna for contactless communication device having an increased magnetic field strength wound plural times the loop portion of the loop antenna is disclosed.

Incidentally, none of the Patent Documents 1 and 2, not intended to be used in the measurement of the immunity.

Further, in Patent Document 1, without the Radio Law of problems have been described as capable of performing the signal electrical transmission. This magnetic field loop antenna occurs is sufficiently synthesized, i.e., it is considered that the magnetic field distribution at a sufficient distance from the loop antenna problems. In contrast, the present invention, the magnetic field distribution in the vicinity of the loop antenna and an object, and controls the magnetic field distribution in the vicinity of the loop antenna.
JP-A-62-61430 JP JP 2006-74348 JP (second embodiment)

The present invention has been made in view of the above, it is an object by controlling the magnetic field distribution in the vicinity of the loop antenna, it allows the generation of a magnetic field distribution of circular to match the measured, is to provide a novel loop antenna immunity performance has been low circuits and components to accurately identify possible.

Another object of the present invention, an electronic apparatus having an extremely short distance communication function, by selectively attenuating the magnetic field of the peripheral components that do not want to irradiate the magnetic field, desirable to provide an electronic apparatus capable of preventing erroneous operation it is.

The present invention, in order to achieve the above object, basically, is to employ a technique configured as described below.
That is, the first aspect of the loop antenna according to the present invention,
A first annular conductor,
The smaller than the first annular conductor has a second annular conductor one or more located inside the ring of the first annular conductor,
The second annular conductor being connected to the first annular conductor in series,
And characterized in that said first annular conductor and the second annular conductor is arranged on the same plane,
In addition, the second aspect,
A first annular conductor formed on the substrate,
The smaller than the first annular conductor has a second annular conductor one or more located inside the ring of the first annular conductor,
The second annular conductor being connected to the first annular conductor in series,
Said first annular conductor and the second annular conductor, which is characterized in that disposed on different surfaces of the substrate,
In addition, the third aspect,
An annular conductor,
A metal plate member and disposed inside the ring of the annular conductor,
Which is characterized in that the annular conductor and the metal plate body is disposed on the same plane,
The fourth aspect,
An annular conductor formed on the substrate,
A metal plate member and disposed inside the ring of the annular conductor,
Wherein the ring conductor and the metal plate body, which is characterized in that disposed on different surfaces of the substrate,
In addition, a fifth aspect of,
And the substrate,
An annular conductor provided on the first surface of the substrate,
Wherein provided inside the annular conductor ring at the first surface of the substrate, and a metal pad for connecting the inner conductor or the outer conductor of the coaxial cable,
Provided on a first surface is different from a second surface of the substrate, a metal plate member and which are connected by the metal pads and a plurality of vias,
And characterized in that the connecting perpendicularly the coaxial cable to the substrate surface,
In addition, aspects of the sixth,
And the substrate,
An annular conductor provided on the first surface of the substrate,
Wherein provided inside the annular conductor ring at the first surface is different from a second surface of said substrate, and a metal pad for connecting the inner conductor or the outer conductor of the coaxial cable,
Provided on the first surface of the substrate, a metal plate member and which are connected by the metal pads and a plurality of vias,
Is characterized in that the connecting perpendicularly the coaxial cable on the substrate surface.

Also, aspects of the magnetic field generating method according to the present invention,
A first annular conductor, the smaller than the first annular conductor has a second annular conductor one or more located inside the ring of the first annular conductor, said second annular conductor a loop antenna connected to the first annular conductor in series, driven at a frequency having a sufficiently long wavelength as compared to the entire length of said first annular conductor and a second annular conductor, annular magnetic field distribution it is characterized in that to generate.

Loop antenna of the present invention, since the structure described above, it becomes possible to selectively irradiate magnetic fields has facilitated the immunity performance identifies the lower part.

Also, mounting method of the loop antenna of the present invention, an electronic apparatus having an extremely short-range communications function, because it is possible to selectively attenuate the magnetic field near the component you do not want to irradiate the magnetic field, it is possible to prevent the malfunction.

Is a diagram illustrating an example of the loop antenna construction of the present invention. It is a side view of FIG. 1A. Is a diagram showing the magnetic field distribution in the vicinity of the loop antenna of the present invention. Is a diagram showing the magnetic field distribution in the vicinity of the loop antenna of the present invention. It is a diagram illustrating another configuration example of the loop antenna of the present invention. It is a diagram illustrating another configuration example of the loop antenna of the present invention. It is a diagram illustrating another configuration example of the loop antenna of the present invention. It is a diagram illustrating a configuration of a loop antenna having a conductive plate of the present invention. In view of Figure 4A the connection pads is a diagram showing an example in which the inside of the annular conductor. Is a diagram showing a conductor plate provided on the other surface of the printed wiring board of FIG. 4B. It is a diagram illustrating another configuration example of the loop antenna of the present invention. It is a diagram illustrating another configuration example of the loop antenna of the present invention. It is a diagram illustrating another configuration example of the loop antenna of the present invention. It is a diagram illustrating another configuration example of the loop antenna of the present invention. 45 degree direction QFP is a diagram showing that the lead frame does not exist. It is a diagram illustrating another configuration example of the loop antenna of the present invention. It is a diagram illustrating another configuration example of the loop antenna of the present invention. The loop antenna of the present invention. FIG applied to SiP. It is a side view of Figure 9A. Both chip shown in FIG. 9A is a diagram showing that it is connected by wiring on the interposer. Is a diagram comparing the magnetic field distribution between the loop antenna and the conventional loop antenna of the present invention. It is a diagram illustrating a conventional immunity testing method. Is a side view of FIG. 11A. It is a diagram illustrating a conventional loop antenna. It is a diagram for explaining a method of measuring the magnetic field distribution of the conventional loop antenna vicinity. Is a top view of FIG. 13A. Is a diagram illustrating an example of a magnetic field distribution of the conventional loop antenna vicinity. Is a diagram illustrating an example of a magnetic field distribution of the conventional loop antenna vicinity. It is a diagram illustrating a case of irradiating the magnetic field over the QFP entire surface in the magnetic field irradiation method. Is a diagram showing a case where create a loop line having a small outer diameter for irradiating a magnetic field only in chip LSI is formed in the magnetic field irradiation method. Bonding wire and the bonding wire in the magnetic field irradiation method is a diagram showing a case of irradiating the magnetic field by selecting a portion to be connected to the lead frame. It is a diagram illustrating a case of irradiating the magnetic field, including up wiring on the mounting board in a magnetic field irradiation method. Is a diagram illustrating a case where a test that contains all of the components connected to the circuit under test in a magnetic field irradiation method. In particular the lead frame in the magnetic field irradiation method is a diagram showing a case where not irradiated field.

DESCRIPTION OF SYMBOLS

1 QFP
2 chip 3 lead frame 4 bonding wire 5 mounted board 6 wires 10 antenna 11 loop line 12 leads 13 printed wiring board 14 the connector 15 miniature magnetic field probe 16 coaxial cable 17 a signal generator 18 probe head 20 loop antenna 21 printed wiring board 22 annular conductor 23 ring conductor 24 connecting wiring 25 connection wiring 26 coaxial cable 27 sleeve 28 conductive pattern 30a pad 30b pads 31a current 31b current 32 conductive plate 33 via 34 via 50 interposer 51 chips 52 chips 58 wiring 59 wiring 60 spacer 61 ring conductor 62 annular conductor

Loop antenna of the present invention comprises a first annular conductor, smaller than the first annular conductor, and one or more second annular conductor located inside the ring of the first annular conductor, first those in the ring conductor and the region sandwiched between the second annular conductor by configured to effect a magnetic field of an annular, which selectively irradiated with the magnetic field, is configured as immunity performance identifies the lower part it is.

Incidentally, the loop antenna of the present invention, a first annular conductor and the second annular conductor connected in series, may be configured to drive a single signal source, a first annular conductor second annular conductor and a may be driven by separate signal source.

As the shape of the annular conductor of the present invention is intended to include polygonal including rectangular, circular.

Next, embodiments of the present invention will be described with reference to FIG.

Figure 1 is a diagram for explaining an embodiment of the loop antenna 20 of the present invention.

Loop antenna 20 of the present invention, a printed wiring board 21 and formed thereon a conductor pattern 28.. Conductive pattern 28 includes an annular conductor 22 formed so as to surround the outer, the annular conductor 23 connected in series to a portion thereof, and a connection wiring 24 for connecting the respective annular conductors. Annular conductor 23 has a smaller outside dimension than the annular conductor 22 is disposed inside the annular conductor 22. Annular conductor 22 is connected to the connection wiring 25, the other end of the connecting wire 25, the pad 30a, and is connected to 30b. Side view of FIG. 1B shows a state of connecting vertically coaxial cable 26 to the printed wiring board 21, while the center conductor of the coaxial cable to have electrical conduction with a method such as soldering to a pad 30a It is fixed. On the other hand, the outer conductor of the coaxial cable is connected to the pad 30b through the sleeve 27. By performing such connection, it can be connected while suppressing the coaxial structure collapses, and perpendicular to the conductor pattern 28. The other end of the coaxial cable 26 is connected to the signal generator 17, signals sent from the signal generator 17 is transmitted to the annular conductor 22 and 23, to generate a magnetic field in accordance with the laws of electromagnetism to the peripheral annular conductor 22 . By fixing the coaxial cable 26 vertically, it can be brought close to the antenna 20 at a constant height as shown in FIG. 11B to QFP 1.

Figure 2A, B is the result of a magnetic field on the loop antenna 20 was measured in FIG. 13A, the same measurement system as B. Each figure is displayed is normalized by the maximum value. In FIG. 2A (x, y) = (18mm, 18mm) are centered annular conductor of the loop antenna 20 in. Dimensions of outer dimensions of the annular conductor 24 is 24 mm, the annular conductor 23 is 15 mm, the wiring width is 1 mm. Figure magnetic field strength in the central portion in 2A is reduced, it can be seen that a strong magnetic field in the annular occurs. Figure 2B is a result of measuring the A-A 'distribution on line in FIG. 13B, peaks are observed at two locations.

This peak is substantially located within the region sandwiched between the annular conductor 22 and ring conductor 23. In Figure 1A, assuming current 31a supplied from the signal generator 17 to the annular conductor 22 is flowing, annular conductor 22 produces a magnetic field from the front of the sheet in a direction penetrating the back at the center thereof. At this time, since the current 31b flowing through the annular conductor 23 is opposite direction to the current 31a, resulting in the magnetic field from the back side of the paper in the center portion in a direction penetrating the front side.

In Figure 1A, because the center of the annular conductor 22 and ring conductor 23 are matched, a combined magnetic field of the annular conductor 22 and the annular conductor 23, the strength is reduced in the vicinity of its center. This can also be considered a conductor pattern 28 is provided with two different loop antennas oriented to oscillate in the same phase.

The above results, in Figure 1A, the two loop antennas, a case of driving with a signal of a frequency having a sufficiently long wavelength as compared to the full length of the annular conductor 22 and 23, selecting such a frequency it makes annular conductor 22 and 23 are driven in phase, to produce a magnetic field, it is possible to obtain a magnetic field distribution of the annular shown in Figure 2A. Effect of voltage and current distribution on the annular conductor as the wavelength is shorter than the length of the annular conductor is increased, it becomes impossible to generate a circular magnetic field distribution with a uniform magnetic field strength.

In Figure 1A, the annular conductor 22, 23 has a shape close to a square. When the measurement object and QFP, the test can be carried out over the entire surface of the object by a square. Usually, the QFP1 and chip 2, a substantially square, each side is a positional relationship as to be parallel. Therefore, as shown in FIG. 1A, by arranging the annular conductor 23 to the center of the annular conductor 22 such that each sides are parallel, it can be irradiated by selecting the irradiation range shown in FIG. 15.

When the measurement object is desired to be irradiated with the magnetic field to a portion of the case and the measurement object is a circle, it may be designed to conductive pattern 28 to match the shape thereof. Accordingly, the conductor pattern 28 according to the purpose, rectangular, trapezoidal, circular, elliptical, is made of a polygon. Annular conductor 22 and the annular conductor 23 need not be the same shape, a combination of different shapes as shown in FIG. 3A is acceptable. Figure 3C shows an example in which a plurality of annular conductors 23.

Moreover, it is not necessary to match the center of the annular conductor 23 of the annular conductor 22, it is also possible to install the ring conductor 23 to the asymmetrical position relative to the annular conductor 22. The packages such as SiP (System in Package), there are also many that the chip is mounted asymmetrically located, it is adaptable to such a mounting system.

By using the loop antenna 20 as described above, FIG. 15C, it is possible to irradiate the magnetic field in the annular area shown in FIG. 15D, help identify electromagnetic sensitive components and circuits.

Chip 2, the bonding wires 4, the lead frame 3, factors printed wiring 6, respectively A, factor B, factor C, and assigned to factor D, in the test according to the conventional antenna 10, will always contain the factor A. That is, by performing the test while changing the outer dimensions of the loop line 11, factors A, factor (A + B), factor (A + B + C), factor (A + B + C), measuring the electromagnetic immunity in combination such factors (A + B + C + D) become. In the method of selecting the irradiation area in such addition type, for example, when the contribution to immunity factors A large, it is impossible to separate the contribution of other factors, each factor when the interaction between each factor is large effect of there has been a disadvantage, such as difficult separation. In the present invention, an example and a source (B + C), factor (C + D), since the test was partially eliminated factors in the adjacent place to such as factor C is possible, it is easy to factor analysis, electromagnetic susceptibility It helps identify the high parts and circuits.

In Figure 4A, a substituted structure inside the annular conductor 23 in the conductor plate 32 made of a metal plate having a predetermined area. Conductive plate 32 in FIG. 4A is disposed at a center portion of the annular conductor 22. Driving annular conductor 22 at a predetermined frequency, but results in a strong magnetic field in the interior of the ring, the conductor plate 32 if thicker to such an extent that the magnetic field can not penetrate, the magnetic field in the central portion of the conductive plate 32 is attenuated. It is not an operation that cancels the magnetic field aggressively as the loop antenna 20, but it is possible to obtain the same annular distribution loop antenna 20. If each side of the conductor plate 32 by forming in parallel to each side of the annular conductor 22, it is possible to generate a magnetic field distribution shown in FIG. 15B, C. The shape of the conductive plate 32, in accordance with the state of measuring may be selected trapezoid any shape. Further, the shape of the shape and the metal plate annular conductor may be configured differently.

In FIG. 4A, the pads 30a for connecting a coaxial cable 26, 30b is, is a disposed Configurations outside the annular conductor 22 provided on one surface of the printed wiring board 21, Fig. 4B , the connection pad 31a, and 31b is an example in which the inside of the annular conductor 22.

Figure 4C is a conductive plate 32 provided on the other surface of the printed wiring board 21 of FIG. 4B, the conductive plate 32 is connected to a pad 31b and the via 33, the ground conductor of the coaxial cable 26 together with pads 31b It is connected to. Again, the magnetic field is attenuated in the conductive plate 32 near as in FIG. 4A. Downsizing can be achieved because the coaxial cable 26 can be installed inside the annular conductor 22.

Although not shown, with a conductive plate 32 arranged on the inner side of the annular conductor 22 and the conductive plate 32 is formed in the same plane and the annular conductor 22, opposite the pad 31a, and 31b to the conductive plate 32 conductor it may be configured so as to provide the surface with different surfaces plate 32 is provided.

Figure 5A, the shape of the annular conductor 22 and the polygon is a shape that applies a magnetic field only in the region indicated by oblique lines in FIG. 16A. Although normal loop antenna is rectangular, annular, as shown in FIG. 5A,, combined with the shape of the lead frame of the QFP, it is possible to irradiate the magnetic field only to a lead frame to be tested. Furthermore, as shown in FIG. 5B, by forming the annular conductor in the interior, it is possible to attenuate the magnetic field strength in the surrounding Ridoburemu so, do not want to test as shown in Figure 16B.

In Figure 6A, when the parallel connection wire and QFP edges 24, 25 are arranged, in one embodiment of the present invention. Thus magnetic field connection wiring 25 around to form the connection wiring 25 is formed originally not required distribution, reduced magnetic field strength, the part of the lead frame is a possibility that the magnetic field is not irradiated with sufficient strength . On the other hand, in FIG. 1A or FIG. 6B, the connection wiring 25 is connected to the corner portion of the annular conductor 22 formed into a rectangle is drawn out to form an angle of each side and 45 degrees of the annular interconnection. On the other hand, a connection wiring 24 is arranged adjacent to the connection wiring 25, the angle of the connecting wires 24, 25 is zero degrees. When the measurement object and QFP, often lead frame is not in a corner portion located. Therefore, FIG. 1A, as shown in FIG. 6C, although QFP internal lead frame is extended relative to the adjacent sides of the QFP, therefore 45 degrees direction is wider spacing. By arranging the lead frame connected to the diagonal there is no wiring 25, to the space required for the test, can be irradiated with a uniform magnetic field. Connection wiring 25 need not be disposed at the connection wiring 24 and the linear shape, but may form an angle of 45 degrees. In FIG. 6B, the connection wiring 24 and connection wiring 25 has a structure that is partially shared.

Further, when the annular conductor is a polygon, it is preferable that the polygon of the two sides are provided with connection wiring 25 to the corners intersecting.

Figure 7 includes an annular conductor 22 and ring conductor 23 are formed in different layers. Annular conductor 23 is disposed inside the annular conductor 22 are connected in series to the ring conductor 22 and ring conductor 23 in via 34. Changing the vertical direction of the distance to the loop plane of the annular conductor 22 and the annular conductor 23 is possible by controlling the thickness of the printed circuit board 21, it is possible to control the intensity distribution on QFP 1.

As described so far, in the frequency band much longer wavelength than the length of the annular conductor, by using the antenna of the present invention, it is possible to generate a characteristic magnetic field distribution. Two annular conductors exemplified can be generated immediately annular magnetic field distribution when using a loop antenna 20 connected in series in Figure 1A.

Further, as shown in FIG. 8, be operated two by independent annular conductor, it is possible to locally adjust the intensity of the magnetic field, an effect equivalent to that of the loop antenna 20 is obtained. In the case of FIG. 8, the controllable annular conductors 61, 62 independently, or by inverting the phase of the signal supplied, it is possible to vary the amplitude, it is possible to efficiently control the magnetic field distribution generated. This enables precise control in comparison with the integral of Figure 1A.

By using these magnetic field distribution generated method, as already mentioned, QFP 1, chip 2 constituting the LSI package, and test of wiring on the printed board becomes possible, the immunity test for analyzing the state of the LSI malfunctions it can be made efficient.

Next, another embodiment of the present invention.

The loop antenna of the present invention described above can also be applied to transmitting and receiving antenna which is incorporated in a printed wiring board or an LSI package.

Figure 9A, the B, and on SiP (System in Package), via a spacer 60, shows a device printed circuit board 21 that the loop antenna is formed is mounted.

To implement the planar antenna in the printed circuit board is to realize thinning and miniaturization. Therefore, SiP and the distance between the antenna conductor is very close, for example, is 1mm or less. Interposer 50 on two chips 51 and 52 are BGA mounted. Chips 51 and 52 are connected to each other by wiring 58 and 59 on the street, the interposer shown in Figure 9C. This is for performing recombination wiring on the interposer 50, the first layer wiring 58 number of connection wirings is increased, the wiring 59 is a multilayer and so second layer.

Such SiP is used like a wireless medium for noncontact reading and writing of information, such as IC card or RFID tag. Also, sometimes it mounted inside an information terminal devices such as mobile phones. Loop antenna 20 of this embodiment is used in transmitting and receiving an external device and data wirelessly. Representative examples of the conventional antenna, the loop antenna 10 illustrated in FIG. 12 and the like. As such a loop antenna 10 already described, it produces a substantially uniform magnetic field distribution as shown in FIG. 14A.

Loop antenna 20 of the present invention generates a magnetic field is driven by the chip 51 performs communication at very short distance to an external LSI. Wiring formed on the interposer, such as the time lines 58 and 59 is longer than the wiring on-chip, susceptible to external electromagnetic fields at lower frequencies than the chip 51. Accordingly, conventional antenna 10 caused a large noise voltage between the wires 58 and 59 used in place of the loop antenna 20 of invade the circuit in the chip 51, 52 becomes conductive noise, circuit malfunctions. In other words, thus it resulted in could allow end noise intrusion by susceptible strong wires 58, 59 to the electromagnetic field coming from the outside than the single chip 51.

Loop antenna 20 of the present invention, as already mentioned, results in the magnetic field distribution of the annular loop antenna 20 near the weak magnetic field strength at the central portion. That is, the electromagnetic sensitivity of the central portion of FIG. 9A is a strong interconnection exists area, since the field strength is weakened, it is possible to reduce the risk of malfunction occurs.

The IC card or the like, is installed receiving antenna so as to face the antenna 20, pole short distance in the communication. If the external dimensions has a loop antenna 10 approximately equal to the receiving antenna, the output of the receiving antenna toward the loop antenna 20 is lowered when excited antenna 10 and the loop antenna 20 at the same power. This is because the field strength of the central portion of the loop antenna 20 is attenuated. Gain during transmission and reception being equal amount of magnetic field in the loop of the receiving antenna is not reduced. When external dimensions of the receiving antennas to compare the integrated value of the magnetic field in the loop as the same as the transmission side, the equivalent magnetic field and the antenna 10 are generated if the transmission power of the loop antenna 20 to 1.8 times, the receiving antenna output There becomes equivalent. Figure 10 is a comparison of the magnetic field distribution in this case. In this case, the magnetic field intensity of the loop antenna 20 near the center is about 30% greater than the magnetic field strength near the center of the loop antenna 10 is about 10dB smaller in decibel notation. Thus, while no conventional equivalent gain, and the effect of the component near the center is protected it can be expected. Incidentally, FIG. 10 is a result of measuring the magnetic field distribution of the antenna 10 and the loop antenna 20 occurs, is normalized by the maximum value of the loop antenna 20.

This application claims priority based on February 2008 Japanese Patent Application No. 2008-30739, filed on 12 days, the entire disclosure of which is incorporated herein.

The present invention is a loop antenna, but can be applied to electronic devices, other relevant various equipment having an extremely short-range communications functions.

Claims (19)

  1. A first annular conductor,
    The smaller than the first annular conductor has a second annular conductor one or more located inside the ring of the first annular conductor,
    The second annular conductor being connected to the first annular conductor in series,
    Said first annular conductor and the loop antenna and the second annular conductor, characterized in that arranged on the same plane.
  2. A first annular conductor formed on the substrate,
    The smaller than the first annular conductor has a second annular conductor one or more located inside the ring of the first annular conductor,
    The second annular conductor being connected to the first annular conductor in series,
    Said loop antenna where the first of the annular conductor and the second annular conductor, characterized in that arranged on different surfaces of the substrate.
  3. It said first annular conductor and a portion surrounded by a second annular conductor, that the magnetic field of the direction in which the first annular magnetic field conductor occurs direction and a second annular conductor occurs are opposite claim 1 or 2 loop antenna wherein.
  4. The first is the ring conductor and the second annular conductor loop antenna according to any one of claims 1 to 3, characterized in that it is rectangular.
  5. It said first annular conductor and the conductor for connecting the second annular conductor, a loop antenna according to claim 4, wherein the arranged at the corners of the rectangle.
  6. Loop antenna according to any one of claims 1 to 5, and each side of each side and a second annular conductor of the first annular conductor characterized in that it is a parallel.
  7. Loop antenna according to any one of claims 1 to 3, the shape of the first annular conductor shape and the second annular conductor are different.
  8. Said first annular conductor or loop antenna according to any one of claims 1 to 3, at least one second annular conductor, characterized in that it has a polygonal shape including a circular or trapezoidal.
  9. Said first annular conductor and the conductor for connecting the second annular conductor, a loop antenna according to claim 8, characterized in that arranged in the corners of the polygonal shape.
  10. An annular conductor,
    A metal plate member and disposed inside the ring of the annular conductor,
    A loop antenna, characterized in that the annular conductor and the metal plate body is disposed on the same plane.
  11. An annular conductor formed on the substrate,
    A metal plate member and disposed inside the ring of the annular conductor,
    Loop antenna wherein the annular conductor and the metal plate body, characterized in that arranged on different surfaces of the substrate.
  12. And the substrate,
    An annular conductor provided on the first surface of the substrate,
    Wherein provided inside the annular conductor ring at the first surface of the substrate, and a metal pad for connecting the inner conductor or the outer conductor of the coaxial cable,
    Provided on a first surface is different from a second surface of the substrate, a metal plate member and which are connected by the metal pads and a plurality of vias,
    A loop antenna, characterized in that the vertically connected to the coaxial cable on the substrate surface.
  13. And the substrate,
    An annular conductor provided on the first surface of the substrate,
    Wherein provided inside the annular conductor ring at the first surface is different from a second surface of said substrate, and a metal pad for connecting the inner conductor or the outer conductor of the coaxial cable,
    Provided on the first surface of the substrate, a metal plate member and which are connected by the metal pads and a plurality of vias,
    A loop antenna, characterized in that the vertically connected to the coaxial cable on the substrate surface.
  14. Wherein an annular conductor and the metal plate body and a rectangular loop antenna according to any one of claims 11 to 13, each side of each side and the metal plate body of said annular conductor, characterized in that it is parallel.
  15. Loop antenna according to any one of claims 11 to 13, characterized in that said annular conductor shape and the metal plate member have different shapes.
  16. Said annular conductor, a loop antenna according to any one of claims 11 to 13, which is a polygonal shape including a circular or trapezoidal.
  17. A first annular conductor, the smaller than the first annular conductor has a second annular conductor one or more located inside the ring of the first annular conductor, said second annular conductor a loop antenna connected to the first annular conductor in series, driven at a frequency having a sufficiently long wavelength as compared to the entire length of said first annular conductor and a second annular conductor, annular magnetic field distribution magnetic field generating method characterized by generating a.
  18. Using a loop antenna according to claim 1 to 16 to generate a circular magnetic field distribution in the vicinity of the loop plane, immunity test method, characterized in examining the malfunction of electronic equipment.
  19. An electronic device having an extremely short distance communication function that uses the loop antenna according to claim 1 to 16, the magnetic field intensity of the loop antenna of the area strong circuits or components of the electromagnetic susceptibility is arranged weaker than the magnetic field strength of the other region implementation method of a loop antenna, characterized in that implemented to.
PCT/JP2008/072937 2008-02-12 2008-12-17 Loop antenna and immunity test method WO2009101750A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2008030739 2008-02-12
JP2008-030739 2008-02-12

Applications Claiming Priority (1)

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JP2009553350A JP5504894B2 (en) 2008-02-12 2008-12-17 Loop antenna and immunity test methods

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JP2011182583A (en) * 2010-03-02 2011-09-15 Denso Corp Voltage control circuit and voltage control system
JP2013511925A (en) * 2009-11-23 2013-04-04 ハリス コーポレイションHarris Corporation How to plan communication antenna and associated with the epicyclic structure and isotropic radiation
JP6006831B1 (en) * 2015-05-18 2016-10-12 日本電信電話株式会社 Uniform electric field range determination method
JP2017041665A (en) * 2015-08-17 2017-02-23 日本電信電話株式会社 Loop antenna array group

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JP2003085519A (en) * 2001-09-11 2003-03-20 Toshiba Corp Radio card
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JP2003532318A (en) * 2000-04-21 2003-10-28 アエスカ エス.ア. Antenna regarding contactless transmission / reception reading system
JP2004215061A (en) * 2003-01-07 2004-07-29 Ngk Spark Plug Co Ltd Folded loop antenna
JP2004336198A (en) * 2003-05-01 2004-11-25 Toshiba Corp Antenna assembly
JP2005027296A (en) * 2003-07-02 2005-01-27 Sensormatic Electronics Corp Phase compensated electromagnetic-field-canceling nested loop antenna
JP2007523563A (en) * 2004-02-20 2007-08-16 スリーエム イノベイティブ プロパティズ カンパニー Radio frequency identification (rfid) field for the system shaping shielding

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JP2003532318A (en) * 2000-04-21 2003-10-28 アエスカ エス.ア. Antenna regarding contactless transmission / reception reading system
JP2003085519A (en) * 2001-09-11 2003-03-20 Toshiba Corp Radio card
JP2003098211A (en) * 2001-09-27 2003-04-03 Denki Tsushin Univ Immunity testing method, immunity testing device and rotary magnetic field generating device
JP2004215061A (en) * 2003-01-07 2004-07-29 Ngk Spark Plug Co Ltd Folded loop antenna
JP2004336198A (en) * 2003-05-01 2004-11-25 Toshiba Corp Antenna assembly
JP2005027296A (en) * 2003-07-02 2005-01-27 Sensormatic Electronics Corp Phase compensated electromagnetic-field-canceling nested loop antenna
JP2007523563A (en) * 2004-02-20 2007-08-16 スリーエム イノベイティブ プロパティズ カンパニー Radio frequency identification (rfid) field for the system shaping shielding

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Publication number Priority date Publication date Assignee Title
JP2013511925A (en) * 2009-11-23 2013-04-04 ハリス コーポレイションHarris Corporation How to plan communication antenna and associated with the epicyclic structure and isotropic radiation
JP2011182583A (en) * 2010-03-02 2011-09-15 Denso Corp Voltage control circuit and voltage control system
JP6006831B1 (en) * 2015-05-18 2016-10-12 日本電信電話株式会社 Uniform electric field range determination method
JP2017041665A (en) * 2015-08-17 2017-02-23 日本電信電話株式会社 Loop antenna array group
WO2017030001A1 (en) * 2015-08-17 2017-02-23 日本電信電話株式会社 Loop antenna array and loop antenna array group

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JP5504894B2 (en) 2014-05-28 grant

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