JP2017092978A - Antenna device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna device capable of flexibly adjusting each resonant frequency that has been double-resonated.SOLUTION: An antenna device comprises: a substrate body 2; a ground pattern GND made of metal foil on the substrate body; an antenna occupied area AOA arranged between a ground pattern on the substrate body and a side 2a of the substrate body; and a first element 3 and a second element 4 made of metal foil within the antenna occupied area. The first element has: a first extension part E1 provided with a feeding point FP on the proximal end side close to the ground pattern, and extending toward the one side of the substrate body with which the antenna occupied area comes into contact; and a second extension part E2 extending from a tip of the first extension part along the one side. The second element has its proximal end connected to the middle of the first extension part, and extends along the second extension part. The second extension part has, on its distal end side, a loading capacity adjustment part E2a which extends so as to exceed the tip of the second element. Open ends of the first element and the second element are arranged toward the same direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an antenna device capable of making multiple resonances.

2. Description of the Related Art Conventionally, in communication equipment, an antenna device using a radiation electrode and a dielectric block, an antenna device using a switch, and a control voltage source has been proposed to make the resonance frequency of the antenna double resonant.
For example, as a conventional technique using a dielectric block, Patent Document 1 proposes a composite antenna that achieves high efficiency by forming a radiation electrode on a resin molded body and further integrating the dielectric block with an adhesive. .

  Further, as a conventional technique using a switch and a control voltage source, in Patent Document 2, a first radiation electrode, a second radiation electrode, a middle portion of the first radiation electrode, and a base of the second radiation electrode are disclosed. An antenna device has been proposed that includes a switch that is interposed between the end portion and electrically connects or disconnects the second radiation electrode with the first radiation electrode.

JP 2010-81000 A JP 2010-166287 A

However, the following problems remain in the above-described conventional technology.
That is, in the technique using the dielectric block as described in Patent Document 1, a dielectric block that excites the radiation electrode is used, and it is necessary to design the dielectric block, the radiation electrode pattern, etc. for each device. Depending on design conditions, antenna performance may be degraded, and unstable elements may increase. In addition, since the radiation electrode is formed on the surface of the resin molding, it is necessary to design the radiation electrode pattern on the resin molding. Depending on the communication equipment to be mounted and its application, the antenna design and mold design This is necessary and causes a significant increase in cost. Furthermore, since the dielectric block and the molded resin are integrated with an adhesive, the antenna performance may be degraded or unstable depending on the adhesive conditions (adhesive thickness, adhesive area, etc.) in addition to the adhesive Q value. There is a disadvantage that the number of elements increases.
In addition, in the case of an antenna device using a switch and a control voltage source as described in Patent Document 2, a configuration of a control voltage source, a reactance circuit, and the like are required to switch the resonance frequency with the switch. However, there is a problem in that each device is complicated, there is no degree of freedom in design, and easy antenna adjustment is difficult.

  The present invention has been made in view of the above-mentioned problems, and can flexibly adjust each resonance frequency that has been double-resonated. It is an object of the present invention to provide an antenna device that can be thinned.

  The present invention employs the following configuration in order to solve the above problems. That is, an antenna device according to a first aspect of the present invention includes an insulating substrate body, a ground pattern patterned with a metal foil on the substrate body, and the region on the substrate body as a region where the ground pattern is not formed. An antenna occupation region provided between a ground pattern and at least one side of the substrate body; and a first element and a second element patterned with metal foil in the antenna occupation region, wherein the first element comprises A first extension portion that is provided toward the base end side adjacent to the ground pattern and extends toward any one side of the substrate body that is in contact with the antenna occupation region; and the first extension portion. A second extending portion extending along the one side where the antenna occupying region is in contact with a tip of the existing portion, and the second element is the first element A load capacity adjusting portion in which a base end is connected in the middle of the existing portion and extends along the second extending portion, and the second extending portion extends beyond the tip of the second element on the tip side. The open ends of the first element and the second element are arranged in the same direction.

In this antenna device, since the ground pattern, the first element, and the second element, each of which is patterned with a metal foil, are provided on the surface of the substrate body, each stray capacitance between each element and between the ground patterns and By effectively utilizing this, it is possible to make a double resonance.
In particular, the second element has a proximal end connected in the middle of the first extension part and extends along the second extension part, and the second extension part extends beyond the tip of the second element on the tip side. Since it has the extended loading capacity adjustment part and the open ends of the first element and the second element are arranged in the same direction, the loading capacity adjustment part and the ground pattern projecting from the second element The stray capacitance can also be generated between the two, and the capacitance adjustment by the loading capacitance adjustment unit becomes possible, so that the resonance frequency obtained mainly by the first element can be easily set.
Further, since the second element is interposed between the second extending portion of the first element and the ground pattern, the second element is directly between the base end side and the ground pattern with respect to the loading capacity adjusting portion of the second extending portion. No stray capacitance is generated, and the dependence due to the distance between the base end side and the ground pattern is less than that of the loading capacity adjustment unit. In addition, a high-frequency current generated by radiation from the first element 3 can be efficiently passed to the ground pattern GND via the second element 4 and the first extending portion E1. On the other hand, a part of the high-frequency current due to the radiation from the second element flows to the second extending portion and then flows to the ground pattern via the first extending portion. Thus, a high-frequency current that contributes to radiation can be obtained efficiently.

An antenna device according to a second aspect of the present invention is characterized in that, in the first aspect, the loading capacity adjustment portion has a wide portion that is widened and spreads toward the second element side.
That is, in this antenna device, the loading capacity adjustment portion has a wide portion that is wide and widened toward the second element side. Therefore, depending on the width and length of the wide portion, It is possible to effectively use the stray capacitance between them.

An antenna device according to a third invention is characterized in that, in the first or second invention, an antenna element of a dielectric antenna is connected in the middle of the second extending portion.
That is, in this antenna device, the element length of the loading element that does not self-resonate at a desired resonance frequency can be shortened, the impedance can be increased, and the stray capacitance can be increased. In addition, the size and the antenna characteristics can be improved.
Further, the stray capacitance between the antenna element and the second element does not directly generate a stray capacitance between the antenna element and the ground pattern, and the high impedance between the antenna element and the second element. The stray capacitance allows a high-frequency current to flow to the ground pattern through the second element more efficiently.
In addition, it is possible to design in the plane of the substrate body, and it is possible to reduce the thickness compared to the case of using a conventional dielectric block or resin molded body, and by selecting an antenna element that is a dielectric antenna, Miniaturization and high performance are possible. Further, there is no need for costs due to molds, design changes, etc., and low costs can be realized.

An antenna device according to a fourth invention is the antenna device according to any one of the first to third inventions, wherein a first passive element is connected to the first extending portion, and a second passive element is connected to the second element. And a base end of the first extending portion is connected to the ground pattern via a third passive element.
That is, in this antenna device, each resonance frequency can be flexibly adjusted by selecting each passive element, and an antenna device capable of making multiple resonances according to design conditions can be obtained. Thus, since each resonance frequency can be flexibly adjusted in terms of the antenna configuration, the resonance frequency can be switched, and the adjustment location by a passive element or the like can be changed according to the application or device.

The antenna device according to a fifth invention is characterized in that, in the third invention, a fourth passive element is connected in the middle of the second extending portion on the tip side of the antenna element.
That is, in this antenna device, by selecting a fourth passive element having a high impedance, a different resonance frequency is obtained mainly from the base end of the second extending portion to the fourth passive element. Is possible.

The present invention has the following effects.
According to the antenna device of the present invention, since the ground pattern, the first element, and the second element, each of which is patterned with a metal foil on the surface of the substrate body, are provided, between each element and between the ground patterns, etc. As a result, stray capacitance is generated, and multiple resonances can be achieved with at least two resonance frequencies.
In particular, the second element has a proximal end connected in the middle of the first extension part and extends along the second extension part, and the second extension part extends beyond the tip of the second element on the tip side. Since it has the extended loading capacity adjustment part and the open ends of the first element and the second element are arranged in the same direction, the loading capacity adjustment part and the ground pattern projecting from the second element The stray capacitance can be generated between the first element and the capacitance adjustment by the first element is possible, and the setting of the resonance frequency obtained mainly by the first element is facilitated.
In addition, each resonant frequency can be flexibly adjusted by selecting antenna elements and passive elements to be connected to the element, so that multiple resonance can be achieved according to design conditions, and miniaturization and high performance can be achieved. .
Therefore, the antenna device of the present invention can easily achieve multiple resonances corresponding to various applications and devices, and can save space.

In 1st Embodiment of the antenna device which concerns on this invention, it is a top view which shows the positional relationship of each element. In 1st Embodiment, it is a wiring diagram which shows the main area | regions which contribute to each resonance frequency. FIG. 3 is a wiring diagram showing stray capacitance generated in the antenna device in the first embodiment. In 1st Embodiment, it is a perspective view (a) which shows an antenna element, a top view (b), a front view (c), a bottom view (d), and a rear view (e). In 1st Embodiment, it is a graph which shows the VSWR characteristic (voltage standing wave ratio) at the time of making it 3 resonance. It is a wiring diagram which shows the stray capacitance which arises in an antenna device in 2nd Embodiment of the antenna device which concerns on this invention. In 3rd Embodiment of the antenna device which concerns on this invention, it is a top view which shows the positional relationship of each element. In the Example of the antenna device which concerns on this invention, it is a graph which shows the radiation pattern of an antenna device.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an antenna device according to a first embodiment of the invention will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the antenna device 1 according to the present embodiment includes an insulating substrate body 2, a ground pattern GND formed by patterning a metal foil such as a copper foil on the substrate body 2, and a ground pattern GND. As a region in which the antenna is not formed, an antenna occupation area AOA provided between the ground pattern GND on the substrate body 2 and at least one side of the substrate body 2, and a pattern formed with a metal foil such as a copper foil in the antenna occupation area AOA The first element 3 and the second element 4 are provided.

The first element 3 is provided with a feeding point FP on the base end side close to the ground pattern GND, and one side of the substrate body 2 that is in contact with the antenna occupation area AOA (in this embodiment, the reference numeral in FIG. 1). 2a) and a second extending portion E2 extending from the tip of the first extending portion E1 along the one side 2a where the antenna occupation area AOA contacts. doing. That is, the second extending portion E2 extends along the extending direction between the end side of the opposing ground pattern GND and the one side 2a of the substrate body 2.
The base end of the second element 4 is connected to the middle of the first extending portion E1, and extends along the second extending portion E2. That is, the open ends of the first element 3 and the second element 4 are directed in the same direction.

  The second extending portion E2 has a loading capacity adjusting portion E2a extending beyond the tip of the second element 4 on the tip side. In other words, the second extending portion E2 and the second element 4 extend in the same direction, but the second extending portion E2 has the second element 4 corresponding to the length of the loading capacity adjusting portion E2a. Longer than. The portion of the loading capacity adjustment unit E2a faces the ground pattern GND.

Further, an antenna element AT of a dielectric antenna is connected in the middle of the second extending portion E2. The antenna element AT faces the second element 4.
A first passive element P1 is connected in the middle of the first extension part E1, a second passive element P2 is connected to the base end of the second element 4, and the base end of the first extension part E1 Is connected to the ground pattern GND through the third passive element P3.
The first passive element P <b> 1 is connected to the distal end side of the connection portion of the second element 4.

The first extending portion E1 includes a proximal end portion E1a from the proximal end to the connection portion of the second element 4, and a distal end side from the distal end of the proximal end side portion E1a to the distal end via the first passive element P1. Part E1b. The base end side portion E1a is formed wider than the tip end side portion E1b, and the connection portion of the third passive element P3 and the feeding point FP are set with a gap in the portion on the ground pattern GND side.
Further, a fourth passive element P4 is connected in the middle of the second extending portion E2 on the tip side of the antenna element AT. The fourth passive element P4 is connected to the front end side of the antenna element AT, but is preferably connected to a portion closer to the antenna element AT than the loading capacity adjustment unit E2a side.

The board body 2 is a general printed board, and in the present embodiment, a printed board made of glass epoxy resin or the like is employed.
The feed point FP is connected to a feed point of a high frequency circuit (not shown). A high frequency circuit is mounted in the area of the ground pattern GND.
For example, an inductor, a capacitor, a resistor, or a jumper line is used as each passive element.

The antenna element AT is a loading element that does not self-resonate at a desired resonance frequency, and is a chip antenna in which a conductor pattern 122 such as Ag is formed on the surface of a dielectric 121 such as ceramic as shown in FIG. is there.
As the antenna element AT, elements having different lengths, widths, conductor patterns, and the like may be selected according to the setting of the resonance frequency and the like. Depending on the desired frequency, the dielectric 121 used in the antenna element AT may be a magnetic material or a composite material in which a dielectric and a magnetic material are mixed.

The first element 3 and the second element 4 extend at a distance from each other so as to generate a stray capacitance between them and a stray capacitance between the ground pattern GND.
That is, as shown in FIG. 3, the stray capacitance Ca between the loading capacity adjustment unit E2a and the ground pattern GND, and between the second element 4 from the tip of the antenna element AT to the base end of the loading capacity adjustment unit E2a. The stray capacitance Cb, the stray capacitance Cc between the second element 4 and the ground pattern GND, the stray capacitance Cd between the antenna element AT and the second element 4, and the second extending portion from the base end of the antenna element AT A stray capacitance Ce between the base end of E2 and the base end portion and the base end side portion E1a of the second element 4 can be generated.

  Next, each resonance frequency in the antenna device of the present embodiment will be described with reference to the drawings.

In the antenna device 1 according to the present embodiment, as shown in FIG. 5, the first resonance frequency f1, the second resonance frequency f2, and the third resonance frequency f3 are combined in three frequency bands in order from the lowest frequency. Resonated.
The first resonance frequency f1 is determined by the first element 3, the antenna element AT, the first passive element P1, the fourth passive element P4, and the stray capacitance. The second resonance frequency f2 is determined by the second extending portion E2 and the stray capacitance on the base end side from the antenna element AT, the first passive element P1, and the fourth passive element P4. Further, the third resonance frequency f3 is determined by the second element 4, the first element 3, the second passive element P2, and the stray capacitance.

Hereinafter, these resonance frequencies will be described in more detail.
“About the first resonance frequency f1”
The frequency of the first resonance frequency f1 can be set and adjusted by the first element 3, the antenna element AT, the first passive element P1, the fourth passive element P4, and the stray capacitances Ca, Cb, Cc, Cd, and Ce. it can.
Further, the impedance adjustment of the first resonance frequency f1 can be performed by setting each of the stray capacitances Ca, Cb, Cc, Cd, and Ce.
Further, the final frequency adjustment can be flexibly performed by selecting the first passive element P1 and the fourth passive element P4.
In this way, the first resonance frequency f1 is adjusted mainly at the portion of the two-dot chain line A1 in FIG.

“About the second resonance frequency f2”
The frequency of the second resonance frequency f2 is the antenna element AT, the first passive element P1, the second extending part E2, the first extending part E1, and the stray capacitances Cd, Ce on the base end side from the fourth passive element P4. , Cc can be set and adjusted. The fourth passive element P4 is set to have a high impedance at this frequency.
Further, the impedance adjustment of the second resonance frequency f2 can be performed by setting each of the stray capacitances Cd, Ce, Cc.
Furthermore, the final frequency adjustment can be flexibly performed by selecting the first passive element P1.
Thus, the second resonance frequency f2 is adjusted mainly at the portion indicated by the broken line A2 in FIG.

“About the third resonance frequency f3”
The frequency of the third resonance frequency f3 can be set and adjusted by the second element 4, the first element 3, and the stray capacitances Cc, Cd, and Ce.
Further, the impedance adjustment of the third resonance frequency f3 can be performed by setting each of the stray capacitances Cc, Cd, and Ce.
Further, the final frequency adjustment can be flexibly performed by selecting the second passive element P2.
In this way, the third resonance frequency f3 is adjusted mainly at the portion of the alternate long and short dash line A3 in FIG.

  The final impedance adjustment at each of the resonance frequencies f1, f2, and f3 can be flexibly performed by controlling the flow of the high-frequency current flowing to the ground pattern GND side by selecting the third passive element P3. .

As described above, the antenna device 1 according to the present embodiment includes the ground pattern GND, the first element 3 and the second element 4 each formed by patterning a metal foil on the surface of the substrate body 2. In addition, by effectively using each stray capacitance between the ground pattern GND and the ground pattern GND, a double resonance can be achieved.
In particular, the second element 4 has a proximal end connected to the middle of the first extending portion E1 and extends along the second extending portion E2, and the second extending portion E2 extends to the distal end side of the second element 4. Since the load capacity adjusting portion E2a extending beyond the tip of the first element 3 and the open ends of the first element 3 and the second element 4 are arranged in the same direction, the first element 3 protrudes more than the second element 4 The stray capacitance Ca can also be generated between the loaded capacity adjustment section E2a and the ground pattern GND, and the capacity adjustment by the loading capacity adjustment section E2a is possible, and the resonance frequency obtained mainly by the first element 3 is increased. Easy to set up.

  Further, since the second element 4 is interposed between the second extending portion E2 of the first element 3 and the ground pattern GND, the base end side and the ground pattern with respect to the loading capacity adjusting portion E2a of the second extending portion E2. A direct stray capacitance does not occur between the ground and GND, and the dependency due to the distance between the base end side and the ground pattern GND is less than the loading capacitance adjusting unit E2a. In addition, a high-frequency current generated by radiation from the first element 3 can be efficiently passed to the ground pattern GND via the second element 4 and the first extending portion E1. On the contrary, a part of the high-frequency current due to the radiation from the second element 4 flows to the second extending portion E2 and flows to the ground pattern GND via the first extending portion E1. Thus, a high-frequency current that contributes to radiation can be obtained efficiently.

In addition, the antenna element AT, which is a loading element that does not self-resonate at a desired resonance frequency, can shorten the element length, increase the impedance, and increase the stray capacitance. It is possible to improve the antenna characteristics.
In particular, the stray capacitance between the antenna element AT and the second element 4 does not cause the stray capacitance between the antenna element AT itself and the ground pattern GND directly, and the antenna element AT and the second impedance having a high impedance are not generated. The stray capacitance between the element 4 and the high-frequency current to the ground pattern GND can be more efficiently passed through the second element 4.

Further, by selecting the antenna element AT and each passive element, it is possible to flexibly adjust each resonance frequency, and it is possible to obtain an antenna device capable of making multiple resonances according to design conditions. Thus, since each resonance frequency can be flexibly adjusted in terms of the antenna configuration, the resonance frequency can be switched, and the adjustment location by a passive element or the like can be changed according to the application or device.
In addition, the design can be made in the plane of the substrate body 2, and the thickness can be reduced as compared with the case where a conventional dielectric block or resin molding is used, and the antenna element AT which is a dielectric antenna is selected. Thus, miniaturization and high performance can be achieved. Further, there is no need for costs due to molds, design changes, etc., and low costs can be realized.

Further, by selecting the fourth passive element P4 having high impedance, the fourth passive element P4 and the fourth passive element P4 are mainly connected from the base end of the second extending portion E2 (the right end of the second extending portion E2 in FIG. 1). In between, it is possible to obtain another resonance frequency.
As described above, the passive element selected to have a high impedance is the passive element (the fourth passive element P4 in the present embodiment) used for the lowest resonance frequency (the first resonant frequency f1 in the present embodiment). desirable. Further, it is desirable that the passive element has a high impedance with respect to a desired resonance frequency (the above-described another resonance frequency: the second resonance frequency f2). This is because, even when the impedance becomes high with respect to the desired resonance frequency, a good impedance can be secured with respect to the lowest resonance frequency. For this reason, in this embodiment, the fourth passive element P4 is set to be selected to have a high impedance.

  Next, second and third embodiments of the antenna device according to the present invention will be described below with reference to FIGS. In the following description of each embodiment, the same constituent elements described in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The difference between the second embodiment and the first embodiment is that, in the first embodiment, the loading capacity adjustment portion E2a extends with the same narrow width as the portion to which the fourth passive element P4 is connected. On the other hand, in the antenna device 21 of the second embodiment, as shown in FIG. 6, the loading capacity adjustment portion E22a has a wide portion E22b that is wide and widened toward the second element 4 side. . That is, in the second embodiment, there is provided a substantially square wide portion E22b that expands toward the ground pattern GND facing the front end side of the loading capacity adjusting portion E22a.

As shown in FIG. 6, the wide portion E22b provides a large stray capacitance Ca between the ground pattern GND and the stray capacitance between the wide portion E22b and the second element 4 in addition to the stray capacitance Ca. Cf is generated.
Therefore, in the antenna device 21 of the second embodiment, the loading capacity adjustment portion E22a of the second extension portion E22 has the wide portion E22b that is wide and formed on the second element 4 side. The stray capacitance between the second element 4 and the ground pattern GND can be effectively provided and used depending on the width and length of the portion E22b.

  Further, the difference between the third embodiment and the second embodiment is that, in the second embodiment, an approximately square wide portion E22b is formed, whereas in the antenna device 31 of the third embodiment, FIG. As shown in FIG. 7, the loading capacity adjustment unit E32a employs a wide portion E32b that is wide only in the direction toward the opposing ground pattern GND and narrow in the extending direction of the second extending portion E32. Is a point. That is, the wide part E32b of the third embodiment is a part that appears as if the tip of the second extending part E32 is bent by 90 ° with the same width toward the ground pattern GND.

In the third embodiment, stray capacitances Ca1 and Ca2 are generated between the wide portion E32b and the ground pattern GND, and between the base end of the wide portion E32b to the base end of the loading capacity adjusting portion E32a and between the ground pattern GND. A stray capacitance Ca3 is generated.
Thus, in the antenna device 31 of the third embodiment, the stray capacitances Ca1, Ca2, and Ca3 can be obtained by the wide portion E32b having a smaller area than that of the second embodiment.
As shown in the second and third embodiments, the stray capacitances Ca (Ca1, Ca2, Ca3) and Cf can be adjusted by changing the area and shape of the wide portion.

  Furthermore, in the second embodiment, the first extending portion E1 extends linearly from the proximal end side portion E1a to the distal end side portion E1b. However, in the third embodiment, the distal end side portion E31b is The antenna occupation area AOA comes into contact with the antenna element after extending in the direction opposite to the projecting extension direction of the second element 4 from the tip of the end side portion E31a (connection point of the second element 4) through the first passive element P1. The second embodiment is different from the second embodiment in that it extends toward the one side 2a. Thus, as long as it extends toward the one side 2a with which the antenna occupation area AOA is in contact with the first extending portion E31 as a whole, it may be bent halfway. In the first extending portion E31, a stray capacitance Cg is generated between the tip side portion E1b and the ground pattern GND.

  In the second embodiment, the antenna occupation area AOA is in contact with only one side 2a of the board body 2. However, in the third embodiment, the antenna occupation area AOA is arranged at the corner of the board body 2, and the antenna Another difference is that the occupied area AOA is in contact with two sides of the substrate body 2. In the third embodiment, the second extending portion E32 extends along one side 2a out of the two sides of the substrate body 2 in contact with the antenna occupation area AOA.

  Furthermore, in the third embodiment, the third passive element P3 and the feeding point FP are connected to the ground pattern GND on the second element 4 side. Note that the end sides of the ground pattern GND of the third embodiment are formed in steps. Further, the base end side portion E31a of the first extending portion E31 is set to have the same width as the tip end side portion E31b, and is directed toward the step portion of the ground pattern GND for the connection of the third passive element P3 and the feeding point FP. Two protruding branches E31c are provided. That is, the third passive element P3 is connected to the tip of the branch E31c protruding from the base end of the base end side E31a, and the tip of the branch E31c protruding from the middle of the base end side E31a is connected to the feeding point FP. Is done. A stray capacitance Ch is generated between the branch part E31c to which the third passive element P3 is connected and the ground pattern GND.

  Next, the results of measuring the VSWR characteristics (voltage standing wave ratio) and the results of measuring the radiation pattern at each resonance frequency for the example in which the antenna device of the first embodiment was actually manufactured are shown in FIG. A description will be given with reference to FIG.

In these measurements, the following passive elements were used.
First passive element P1: Inductor with L = 1.0 nH Second passive element P2: Inductor with L = 1.0 nH Third passive element P3: Inductor with L = 1.0 nH Fourth passive element P4: Inductor with L = 15 nH

As can be seen from the measurement results, as shown in Table 1 below, all of the first to third resonance frequencies f1 to f3 have good characteristics.
In Table 1, the frequency band of the first resonance frequency f1 is 1575 MHz, the frequency band of the second resonance frequency f2 is 2440 MHz, and the frequency band of the third resonance frequency f3 is 5200 MHz.

Next, FIG. 6 shows the measurement results of the radiation patterns at the first resonance frequency f1, the second resonance frequency f2, and the third resonance frequency f3 for the antenna device of the above example.
The extending direction from the proximal end of the second extending portion E2 to the distal end (the extending direction of the antenna element AT) is defined as the -Y direction, and the extending direction from the proximal end of the first extending portion E1 to the distal end is defined as the -Y direction. The −X direction was used, and the direction perpendicular to the surface of the substrate body 2 was the Z direction. At this time, vertical polarization, horizontal polarization, and power gain with respect to the ZX plane were measured.

  As a result, the average power gain of the first resonance frequency f1 in the ZX plane is −7.0 dBi, the average power gain of the second resonance frequency f2 is −8.0 dBi, and the average of the third resonance frequency f3 The power gain was -4.6 dBi.

The present invention is not limited to the above embodiments and examples, and various modifications can be made without departing from the spirit of the present invention.
For example, in each of the embodiments described above, the antenna element is provided in the second extending portion. However, the antenna element may be provided in the second element to shorten the element, thereby reducing the size of the entire apparatus.

In addition, as described above, it is preferable to connect the antenna element to be a part of the element, but the second extending portion that is extended only by a metal foil such as a copper foil may be used without connecting the antenna element. . At this time, in order to increase the impedance, at least a part of the second extension part is formed into a narrow pattern narrower than the other parts, or a meander pattern extending in a certain direction as a whole while being folded back zigzag. It is preferable.
Furthermore, when there is a margin in the substrate size, a part of the element may be replaced with a pattern in which a linear or plate-like metal is folded. Moreover, you may make it the pattern swirled in shapes, such as a spiral shape, using a through hole with respect to the front and back of the same board | substrate body.

  In the second embodiment, the wide loading capacity adjustment section having a substantially square shape is provided. However, the loading capacity adjustment section may be removed from the center of the loading capacity adjustment section to form a square frame loop-shaped loading capacity adjustment section. In this case, stray capacitance can be generated also in the loop-shaped loading capacity adjustment unit, and performance degradation due to capacitive coupling with peripheral components can be reduced.

  DESCRIPTION OF SYMBOLS 1, 21, 31 ... Antenna apparatus, 2 ... Board | substrate body, 2a ... One side of board | substrate body, 3 ... 1st element, 4 ... 2nd element, AOA ... Antenna occupied area, AT ... Antenna element, E1, E31 ... 1st Extension part, E2, E22, E32 ... second extension part, E2a, E22a, E32a ... loading capacity adjustment part, E22b, E32b ... wide part, GND ... ground pattern, P1 ... first passive element, P2 ... second Passive element, P3 ... third passive element, P4 ... fourth passive element, FP ... feeding point

Claims (5)

An insulating substrate body, a ground pattern patterned with a metal foil on the substrate body, and a region where the ground pattern is not formed between the ground pattern on the substrate body and at least one side of the substrate body An antenna occupying area provided in the antenna occupying area, and a first element and a second element patterned with a metal foil in the antenna occupying area,
The first element is provided with a feeding point on a proximal end side close to the ground pattern, and extends to one side of the substrate body that is in contact with the antenna occupation region; A second extending portion extending along the one side where the antenna occupying region is in contact with a tip of the first extending portion;
The second element has a proximal end connected in the middle of the first extension part and extends along the second extension part,
The second extending portion has a linear load capacity adjusting portion extending beyond the tip of the second element on the tip side,
An antenna device, wherein open ends of the first element and the second element are arranged in the same direction. The antenna device according to claim 1,
The antenna apparatus according to claim 1, wherein the loading capacity adjustment section includes a wide portion that is widened to extend toward the second element. In the antenna device according to claim 1 or 2,
An antenna device, wherein an antenna element of a dielectric antenna is connected in the middle of the second extending portion. In the antenna device according to any one of claims 1 to 3,
A first passive element is connected to the first extension;
A second passive element is connected to the second element, and a base end of the first extending portion is connected to the ground pattern via a third passive element. The antenna device according to claim 3, wherein
4. An antenna device, wherein a fourth passive element is connected in the middle of the second extending portion on the tip side of the antenna element.