JP4114304B2 - Chip antenna manufacturing method and chip antenna - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chip antenna manufacturing method and a chip antenna to which impedance adjustment or tuning frequency adjustment is applied by making a part of a conductive path pattern near a signal terminal or a ground terminal different from the shape of another conductive path pattern.
[0002]
[Prior art]
A quarter-wave monopole chip antenna formed by forming a conductive path pattern on a substrate made of at least one of a dielectric material or a magnetic material has a conductive path pattern of a predetermined length circulated on the surface, bottom surface, and both side surfaces of the substrate. Thus, an antenna element is formed and tuned to a desired frequency.
[0003]
[Problems to be solved by the invention]
However, the above-described method has a problem that it is difficult to determine an antenna shape having a desired tuning frequency or impedance by calculation in the UHF band.
[0004]
The present invention has been made under such a background, and the antenna element is obtained by making the line width of the conductive path pattern, the length of the conductive path, or the gap of the parallel running portion between the conductive paths different from other parts. An object of the present invention is to provide a chip antenna manufacturing method and a chip antenna capable of obtaining predetermined characteristics of the impedance or the tuning frequency.
[0005]
[Means for Solving the Problems]
A radiating element is formed in a spiral shape on the front surface, back surface, and side surface of a substrate made of at least one of a dielectric material and a magnetic material, and a spiral radiating element is formed. In a chip antenna manufacturing method in which one signal terminal and one ground terminal are connected via a terminal portion conductive path pattern, the conductive path patterns on the front and back surfaces of the base are formed by screen printing a conductive paste. The conductive pattern on the side surface is formed by dipping or paste application using a call coater, and the conductive pattern on the surface and the conductive pattern on the back surface are connected by the conductive pattern on the side surface, and on the front surface or the back surface of the substrate. The terminal part conductive path pattern and the conductive land by screen printing. Forming Te, the line width of the terminal portion conductive path patterns are connected other conductive path pattern or different, or to the terminal portion conductive path pattern connected to the signal terminal or the ground terminal of the conductive lands shape portions, a gap between the terminal portions conductive path pattern to provide a method of manufacturing a chip antenna, characterized in that the extended shape.
[0006]
According to the first aspect of the present invention, a chip antenna in which the impedance or tuning frequency of the antenna is adjusted to a predetermined value by changing the shape of one of the conductive lands, and the impedance between the signal terminal and the ground terminal is adjusted to a predetermined value. Is provided.
[0007]
The invention of claim 2 is a method of manufacturing a chip antenna according to claim 1, the shape of the gap is extended between the terminal portion conductive path pattern of the conductive lands, between the other conductive path pattern characterized by a shape different from the gap.
[0008]
According to the invention of claim 2, it is possible to provide an antenna in which the tuning frequency or impedance of the antenna is efficiently adjusted by selecting the shape of the gap.
[0009]
The invention according to claim 3, in the manufacturing method of the chip antenna according to claim 1 or 2, wherein the different shapes, the signal terminal or the connected to the ground terminal the said terminal portion conductive path pattern of the conductive lands the extended gap in the width direction of the base from the connection point, further gaps in the longitudinal direction of said substrate, characterized in that the extended shape.
According to the invention of claim 3, the adjustment range of the tuning frequency or impedance of the antenna can be increased. Further, the adjustment range of the impedance between the high frequency signal feed terminal and the ground terminal can be increased.
[0010]
According to a fourth aspect of the present invention, in the method for manufacturing a chip antenna according to any one of the first to third aspects, the conductive path pattern on the front surface and the back surface of the substrate formed by screen printing a conductive paste. Is made smaller than the width of the conductor pattern on the side surface of the substrate formed by dipping.
Invention of Claim 5 is manufactured with the manufacturing method of the chip antenna of any one of Claim 1, and the line width of the said terminal part conductive path pattern differs from other conductive path patterns, or The shape of the part connected to the terminal part conductive path pattern connected to the signal terminal or the ground terminal in the conductive land is a shape in which a gap between the terminal part conductive path patterns is extended. This is a chip antenna.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an original view of a chip antenna according to an embodiment of the present invention as viewed from the front, back, or both sides. As an example, the dimensions of the chip are 13.5 mm in length, 2.5 mm in width, and thickness. 0.635 mm.
The hatched portion is the conductive path pattern portion, the basic conductor width is 1 mm, and the conductor pitch is 1.5 mm.
[0012]
1 (a) is a front view, FIG. 1 (b) is a side view taken along line BB of FIG. 1 (a), and FIG. 1 (c) is a back view. CC view of FIG. 1, FIG.1 (d) is DD view of FIG.1 (c) among side views. Accordingly, the surface view of FIG. 1A is a view taken along the line AA of FIG. In each figure, the hatched part is a conductor part, and adjacent conductor parts in each figure are electrically connected to form a modeled circuit diagram shown in FIG.
[0013]
The base 4 of the chip antenna of FIG. 1 has a front surface shown in FIG. 1A, a back surface shown in FIG. 1C, and FIG. 1B and FIG. A pair of side surfaces.
Further, a wide conductive land 1a is formed in order from the end portion on the surface of the substrate 4 in FIG. 1A, and a transverse conductor layer connecting corresponding convex portions of a pair of side surfaces is formed on the back surface in FIG. Formed as a feed portion 1 along the length direction of the base, and on the back side of the transverse conductor layer of the coil portion 2, an oblique conductor layer is formed to connect the convex portions shifted by one of the pair of side surfaces. Conductive layers are also formed on the convex portions, and these conductive layers are spiral conductive layers surrounding the base 4 in a spiral shape as a whole.
[0014]
Here, it is desirable that the substrate 4 has a stable relative dielectric constant (εr) and relative permeability (μr) in a high-frequency band, and has a low loss and a small temperature coefficient (τ _f ) of the resonance frequency. Used.
The conductor preferably has a low conductor resistance such as copper, silver, gold-nickel, etc. For example, a silver-platinum paste is applied.
[0015]
The conductive path pattern on the front surface shown in FIG. 1A or the back surface in FIG. 1C is formed by screen printing a conductive paste.
Further, the conductor pattern in the side view of FIG. 1B or FIG. 1D is formed by dipping or paste application by a call coater, and the conductive path pattern on the surface of FIG. The conductive path pattern on the back surface of (c) is connected. Some of the dipping portions are used as input / output connection terminals to the outside, and further, the side dipping portions h, i, j, or k that are not used for connection between the conductive path pattern on the front surface and the conductive path pattern on the back surface are used. Some of them are used for fixing the chip antenna to the wiring board. This structure achieves miniaturization and weight reduction and enables surface mounting.
[0016]
In addition, the width | variety of the conductive path pattern of the surface of Fig.1 (a) formed by screen-printing a conductive paste, and the width | variety of the conductive path pattern of the back surface of FIG.1 (c) are formed by dipping. By making it smaller than the width of the pattern of b) or FIG. 1 (d), alignment when connecting the front or back surface pattern and the side surface pattern is facilitated, and a spiral structure is easily made.
[0017]
The antenna shown in FIG. 1 is roughly classified into three parts.
The first portion passes through the terminal portions 11 to 13 shown in FIG. 1C used as a feed terminal or ground terminal for a high-frequency signal, and the terminal portions 11 to 13 through the terminal portion conductive path patterns 11a to 13a. 1 is a feed portion 1 connected to a conductive land 1a having a predetermined area in FIG. 1A via a pattern formed by dipping in FIG. 1B.
[0018]
The second part is the circuit pattern of the circuit part on the front surface of FIG. 1 (a) and the circuit pattern of the circuit part of the circuit part shifted by one on the back surface of FIG. 1 (c). It is the coil part 2 which connected by the dipping pattern of this side, and formed the coil as a spiral.
[0019]
The third portion is a free end 3 having a conductive land 3a having a predetermined area.
[0020]
Next, an example of an antenna in which the impedance of the antenna is adjusted, the tuning frequency is adjusted, or the impedance between the signal terminal and the ground terminal is adjusted by changing a part of the shape of the conductive path pattern to another part. 1 and FIG.
[0021]
Adjustment of the impedance of the antenna, adjustment of the tuning frequency, or adjustment of the impedance between the signal terminal and the ground terminal is performed mainly by changing the shape of the conductive land 1a in FIG.
The conductive lands 1a are connected to the terminal portions 11 to 13 for ground terminals or signal terminals through the terminal portion conductive path patterns 11a to 13a on the back surface of the chip and through the dipping pattern on the side surface of the substrate 4.
[0022]
Now, when the terminal portion 11 is used as a ground terminal and the terminal portion 12 is used as a signal terminal, first, it passes through the terminal portion conductive path patterns 11a and 12a in FIG. 3C and passes through the points d and f in FIG. There is a gap in the width direction of the base 4 from the point a between the points, and then a gap spreads on both sides in the length direction of the base 4 to reach the points b and c in FIG. It has been changed to a shape with a letter-shaped gap.
[0023]
The ground terminal 11 is connected to the point d of the conductive land in FIG. 3A via the terminal portion conductive path pattern 11a in FIG.
The signal terminal 12 is connected to the point f of the conductive land in FIG. 3A via the terminal portion conductive path pattern 12a in FIG.
As a result of the above-described shape change, the narrow portion g and the narrow portion are formed from the other portions so as to circulate outside the T-shaped gap abc from point d to point f in FIG. It will be connected via the e part formed along the length direction of the base with the same line width as g, and the impedance between the terminal part 11 and the terminal part 12 is increased, and a predetermined impedance and can do.
[0024]
Further, by this shape change, the path from the terminal portion 11 used as the ground terminal to the coil portion 2 is connected via the point e, so that the conductive path becomes longer, the effective length of the antenna becomes longer, and the predetermined tuning is achieved. It can be a frequency.
[0025]
Since the tuning frequency of the antenna changes in the direction of lowering due to the shape change described above, the tuning frequency of the original diagram in FIG. 1 is generally designed to be higher than a predetermined tuning frequency in advance.
Further, since the impedance of the antenna changes in the increasing direction due to the above-described shape change, the impedance of the original diagram in FIG. 1 is generally designed to be lower than a predetermined impedance in advance.
[0026]
This shape change is performed at the prototype stage of the antenna, and once the desired characteristics are obtained by trimming, the same antenna characteristics can be obtained by screen printing with the same pattern shape. Trimming is not performed at each stage.
However, in the manufacturing stage, when it is desired to finely adjust the tuning frequency and impedance of the antenna, the purpose can be achieved by trimming in the same manner as in the trial manufacturing stage.
[0027]
As mentioned above, although one embodiment of the present invention has been described in detail with reference to the drawings, the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. Included in the invention.
[0028]
For example, the shape change is not limited to the conductive land in the vicinity of the ground terminal portion or the high frequency signal feed terminal portion. Or what changes the distance between conductive paths and adjusts an impedance or a tuning frequency is also contained in this invention.
[0029]
Further, the shape change is not limited to the ground terminal portion or the high-frequency signal feed terminal portion, and the present invention includes a shape change of the coil portion to adjust the impedance or the tuning frequency.
[0030]
Further, the present invention includes a configuration in which the shape of the conductive land at the free end is changed to change the capacity between the ground and the antenna characteristics to be adjusted.
[0031]
【The invention's effect】
As described above, according to the present invention, since the impedance or tuning frequency of the antenna element is adjusted by changing the shape of a part of the conductive path pattern, the conductive path pattern at the time of adjustment in the prototype stage is used. By reproducing the above, it is possible to easily obtain desired antenna characteristics at the manufacturing stage.
[0032]
Also, by making the width of the conductive path pattern on the front or back surface of the substrate formed by screen printing smaller than the width of the side surface formed by dipping, it is easy to align the front or back pattern with the side pattern. The effect that it becomes easy to make a spiral structure is obtained.
[0033]
In addition, since the side surface pattern formed by dipping is provided on the convex portion, an effect of facilitating soldering when connecting to an external circuit is obtained.
[Brief description of the drawings]
FIG. 1 is an original view of a chip antenna according to an embodiment of the present invention as viewed from the front, back, or both sides.
2 is a schematic circuit diagram of the antenna of FIG.
FIG. 3 is a view showing an example of a chip antenna in which a part of the pattern is changed according to the embodiment of the present invention;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Feed part 1a ... Conductive land 2 ... Coil part 3 ... Free end 3a ... Conductive land 4 ... Base | substrate 11, 12, 13 ... Terminal part 11a, 12a, 13a ... Terminal part conductive path pattern

Claims (5)

A radiating element is formed in a spiral shape on the front surface, back surface, and side surface of a substrate made of at least one of a dielectric material and a magnetic material, and a spiral radiating element is formed. In the method of manufacturing a chip antenna in which one signal terminal and one ground terminal are connected to each other through a terminal portion conductive path pattern,
Conductive path patterns on the front and back surfaces of the substrate are formed by screen printing a conductive paste, and a conductive pattern on the side is formed by dipping or paste coating using a call coater. While connecting the path pattern and the backside conductive path pattern,
Forming the terminal part conductive path pattern and the conductive land on the front or back surface of the base by screen printing,
The line width of the terminal portion conductive path pattern is different from other conductive path patterns, or the shape of the portion of the conductive land connected to the terminal portion conductive path pattern connected to the signal terminal or the ground terminal is the method of the chip antenna, wherein a gap between said terminal portion conductive path pattern and extended shape. Method of manufacturing a chip antenna according to claim 1, wherein the gap between the terminal portions conductive path patterns of the conductive land an extended shape, and a shape different from the gap between the other conductive path pattern . The different shapes, a gap is extended from the connection point of the connected terminal portions conductive path patterns in the signal terminal or the ground terminal in the width direction of the substrate, the gap further in the longitudinal direction of the substrate of the conductive lands chip manufacturing method of antenna according to claim 1 or 2 but characterized by the extended shape. The width of the conductive path pattern on the front surface and the back surface of the substrate formed by screen-printing a conductive paste is made smaller than the width of the conductor pattern on the side surface of the substrate formed by dipping. The method for manufacturing a chip antenna according to any one of 1 to 3. It is manufactured with the manufacturing method of the chip antenna of any one of Claim 1 to 4, The line width of the said terminal part conductive path pattern differs from another conductive path pattern, or the said signal terminal among the said conductive lands Alternatively, the chip antenna is characterized in that a shape of a portion connected to the terminal part conductive path pattern connected to the ground terminal is a shape in which a gap between the terminal part conductive path patterns is extended.

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