KR101970861B1 - Antenna device - Google Patents

Antenna device Download PDF

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Publication number
KR101970861B1
KR101970861B1 KR1020157019503A KR20157019503A KR101970861B1 KR 101970861 B1 KR101970861 B1 KR 101970861B1 KR 1020157019503 A KR1020157019503 A KR 1020157019503A KR 20157019503 A KR20157019503 A KR 20157019503A KR 101970861 B1 KR101970861 B1 KR 101970861B1
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KR
South Korea
Prior art keywords
antenna
auxiliary antenna
extending portion
extending
auxiliary
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KR1020157019503A
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Korean (ko)
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KR20150109363A (en
Inventor
신스케 유키모토
료 사이토
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미쓰비시 마테리알 가부시키가이샤
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Publication of KR20150109363A publication Critical patent/KR20150109363A/en
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Publication of KR101970861B1 publication Critical patent/KR101970861B1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • H01Q5/371—Branching current paths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Details Of Aerials (AREA)

Abstract

Provided is an antenna device capable of flexibly adjusting each resonance frequency obtained by double resonance and being capable of downsizing and thinning. (GND), a first element (3), and a second element (4) patterned in a metal foil on a substrate main body (2) And the antenna element AT of the dielectric antenna is connected in the middle and the first auxiliary antenna portion 6 is connected to the tip end of the antenna element AT and the second element is connected to the feed point FP, , A passive element (P2) is connected in the middle, and a second auxiliary antenna part (7) is connected to the tip end of the first auxiliary antenna part and the second auxiliary antenna part , And is formed of a flexible thin film conductor and is folded back and extended above the substrate main body with an interval therebetween.

Description

ANTENNA DEVICE,

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

2. Description of the Related Art Conventionally, an antenna having a radiation electrode and a dielectric block, an antenna using a switch, and a control voltage source has been proposed in order to double-resonate a resonance frequency of an antenna in a communication device. For example, in the prior art using a dielectric block, a composite antenna has been proposed in which a radiation electrode is formed of a resin molding and a dielectric block is integrated with an adhesive to obtain high efficiency.

Patent Document 2 discloses a conventional technique using a switch and a control voltage source in which a first radiation electrode and a second radiation electrode are interposed between a middle portion of a first radiation electrode and a base end portion of a second radiation electrode, And a switch for electrically connecting or disconnecting the second radiation electrode with the first radiation electrode.

Japanese Laid-Open Patent Publication No. 2010-81000 Japanese Patent Application Laid-Open No. 2010-166287

However, the above-described conventional techniques also have the following problems.

That is, in the technique using the dielectric block described in Patent Document 1, a dielectric block for exciting the radiation electrode is used, and it is necessary to design a dielectric block, a radiation electrode pattern, and the like for each device. Depending on the design conditions, Or an unstable factor is increased. In addition, since the radiation electrode is formed on the surface of the resin molded article, it is necessary to design the radiation electrode pattern on the resin molded article, and the antenna design and the mold design are required depending on the communication device to be mounted and its use, . Further, since the dielectric block and the resin molded body are integrated with an adhesive, there is a problem that the antenna performance deteriorates or the instability factor increases depending on the bonding condition (the thickness of the adhesive, the bonding area, etc.) in addition to the Q value of the adhesive. In the case of the antenna device using the switch and control voltage source described in Patent Document 2, since the resonance frequency is switched by the switch, the configuration of the control voltage source, the reactance circuit, and the like are required. And there is a problem that it is difficult to easily adjust the antenna.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide an antenna device capable of flexibly adjusting resonance frequencies, And it is an object of the present invention to provide a possible antenna device.

The present invention adopts the following constitution to solve the above problems. That is, the antenna device of the first invention comprises: an insulating substrate main body; a ground plane formed on the substrate main body by a metal foil; a first element and a second element; and the first element is arranged on the ground surface side Wherein a feed point is formed and extended at a base end thereof, an antenna element of the dielectric antenna is connected in the middle thereof, and a first auxiliary antenna section is connected to the tip end thereof, and the second element is connected to the base end side of the first element A passive element is connected in the middle and a second auxiliary antenna part is connected to the front end thereof. The first auxiliary antenna part and the second auxiliary antenna part are formed of flexible thin film conductors, And is spaced apart from the substrate main body with an interval therebetween.

In this antenna device, since the first auxiliary antenna portion and the second auxiliary antenna portion are formed of a flexible thin film conductor and are folded back and extended above the substrate main body with an interval therebetween, Resonance can be achieved by effectively utilizing the stray capacitance generated between the second auxiliary antenna portion and the ground surface on the substrate main body, the antenna element of the loading element which does not self resonate at a desired resonance frequency, and each element. In addition, since the first auxiliary antenna portion and the second auxiliary antenna portion are formed of flexible thin film conductors and folded back, the interval between the first and second auxiliary antenna portions and the board main body can be appropriately changed, Even when the gap is changed or when the first and second auxiliary antenna portions are to be bent, it is possible to flexibly cope with the arrangement condition of the casing to be mounted. In particular, flexibility of the first and second auxiliary antenna portions can be sufficiently secured by mounting the antenna elements and the passive elements on the first and second auxiliary antenna portions only on the side of the board body. Also, by selecting the antenna elements and the passive elements, it is possible to flexibly adjust the respective resonance frequencies and impedances, and to obtain an antenna device capable of two resonances according to applications, devices, and design conditions. Further, it is possible to design the first and second auxiliary antenna portions and the elongated shapes of the respective elements in the plane of the substrate main body, so that it is possible to make the antenna thinner than that of the conventional dielectric block or the resin molded body, It is possible to downsize and improve the performance by selecting the antenna element. In addition, the cost due to the mold, the design change, and the like is not required, and low cost can be realized.

The antenna device of the second invention is characterized in that, in the first invention, the first auxiliary antenna portion and the second auxiliary antenna portion are patterned with a metal foil on an insulating film. That is, in this antenna device, since the first auxiliary antenna portion and the second auxiliary antenna portion are patterned in a metallic foil on the insulating film, high flexibility can be obtained and a material having a high dielectric constant can be appropriately selected as a material of the insulating film , The pattern shortening effect of the first and second auxiliary antenna portions can be obtained and it is possible to cope with the case where the desired frequency band is low or further miniaturization is demanded. Further, a general-purpose flexible printed circuit board can be used, and cost reduction can be achieved.

The antenna device according to the third invention is characterized in that, in the first or second invention, the open ends of the first auxiliary antenna portion and the second auxiliary antenna portion are disposed in directions opposite to each other. In other words, in this antenna apparatus, since the open ends of the first auxiliary antenna unit and the second auxiliary antenna unit are disposed in opposite directions to each other, the high impedance parts are mutually opposite to each other, It is possible to effectively use the stray capacitance generated between the stator and the stator.

An antenna device according to a fourth aspect of the present invention is the antenna device according to any one of the first to third aspects, wherein the open end of the first auxiliary antenna part is disposed in a direction opposite to the open end of the antenna element. In other words, in this antenna device, since the open end of the first auxiliary antenna portion is disposed in the reverse direction with respect to the open end of the antenna element, the portions having high impedance are mutually opposite to each other, It is possible to effectively utilize the stray capacitance generated between the stator and the stator.

A fifth aspect of the present invention is the antenna device according to any one of the first to fourth aspects, wherein a spacer is provided between the first auxiliary antenna portion and the second auxiliary antenna portion and the substrate main body . That is, in this antenna apparatus, since the spacers are provided between the first auxiliary antenna unit and the second auxiliary antenna unit and the substrate main body, the spacing between the first and second auxiliary antenna units and the substrate main body Can be kept constant. By using the material of the spacer as the high dielectric material, the pattern shortening effect of the first and second auxiliary antenna portions can be obtained. Further, by adopting an elastic material such as rubber, it is possible to obtain a shock absorbing effect.

The antenna device according to a sixth aspect of the present invention is the antenna device according to any one of the first to fifth aspects, wherein the substrate body is patterned with a metal foil and extends from the base end of the first element, Wherein the first element has a feeding point formed at a base end disposed on the ground surface side and a first extension extending in a direction away from the ground surface, And a second extension extending in a direction along the ground plane from a tip of the first extension, the second element extending from a base end of the first element in a direction away from the first extension A third extending portion, and a second extending portion extending from the leading end of the third extending portion along the first extending portion from the ground surface Wherein the first auxiliary antenna portion has a fifth extending portion extending from the front end of the second extending portion toward the upper side of the substrate main body and a second extending portion extending from the front end of the fifth extending portion toward the second And a sixth extending portion extending along the extending portion, wherein the second auxiliary antenna portion has a seventh extending portion extending from the front end of the fourth extending portion toward the upper side of the substrate main body, and a sixth extending portion extending from the front end of the seventh extending portion toward the sixth And an eighth extending portion extending along the extending portion, the second extending portion extending at an interval to the ground plane so as to generate a stray capacitance with the ground plane, and the antenna element is formed in the middle . That is, in this antenna device, the stray capacitance between the first and fourth extension portions and the stray capacitance between the first and second auxiliary antenna portions (mainly the sixth extension portion) and the seventh extension portion And a stray capacitance between the first auxiliary antenna portion (mainly the sixth extending portion) and the eighth extending portion, a stray capacitance between the first auxiliary antenna portion (mainly the sixth extending portion) and the antenna element, The stray capacitance between the antenna section (mainly the sixth extension section) and the ground plane, the stray capacitance between the antenna element and the ground plane, the stray capacitance between the seventh extending section and the ground plane, It is possible to generate a stray capacitance.

According to the present invention, the following effects are exhibited. That is, according to the antenna apparatus of the present invention, the first auxiliary antenna unit and the second auxiliary antenna unit are formed by flexible thin-film conductors, and are folded back and placed on the upper side of the substrate body on which the respective elements, The resonance frequency can be flexibly adjusted, and two resonance according to the design conditions can be achieved, and miniaturization and high performance can be achieved. Therefore, the antenna device of the present invention can easily perform double-resonance corresponding to various uses and devices, and can save space and improve the degree of freedom of wiring and installation.

1 is a plan view of a main part showing a state (a) in which the first and second auxiliary antenna portions are developed and a state (b) in which the antenna element is folded back in one embodiment of the antenna device according to the present invention.
2 is a side view of a main portion showing an antenna device in the present embodiment.
Fig. 3 is a perspective view (a), a plan view (b), a front view (c), and a bottom view (d) of the antenna element in this embodiment.
4 is a wiring diagram showing the stray capacitance generated in the antenna device in the present embodiment.
5 is a graph showing VSWR characteristics (voltage standing wave ratio) in two resonance in the embodiment of the antenna device related to the present invention.
6 is a graph showing a radiation pattern of 900 MHz band in the embodiment of the antenna apparatus according to the present invention.
7 is a graph showing a radiation pattern of 1800 MHz band in the embodiment of the antenna apparatus according to the present invention.
Fig. 8 is a cross-sectional view of the antenna device according to the embodiment of the present invention. Fig. 8 (a) shows a case where the thickness of the spacer is curved and the case where the spacer has a thickness of 3 mm, (C) is a side view of the main part showing the antenna device when the spacer is vertically arranged and the thickness of the spacer is 6 mm.
Fig. 9 is a graph showing the relationship between the case where the thickness of the spacer is curved and the case where the thickness of the spacer is curved and the thickness of the spacer is 3 mm, Of the first resonance frequency is 6 mm.
Fig. 10 is a side view of a main part when a casing showing an antenna device is broken in another example of the present embodiment. Fig.

Hereinafter, an embodiment of an antenna device according to the present invention will be described with reference to Figs. 1 to 5. Fig.

As shown in Figs. 1 and 2, the antenna device 1 according to the present embodiment includes an insulating substrate main body 2, and a ground plane (hereinafter, also referred to as " GND), a first element 3, a second element 4, and a third element 5. On the ground plane GND, a mounting region such as an RF circuit component is formed.

The first element 3 has a feed point FP formed at the base end disposed on the ground plane GND side and extended therefrom and the antenna element AT of the dielectric antenna and the first passive element P1 are connected And the first auxiliary antenna unit 6 is connected to the front end. The second element 4 is connected to the base end side of the first element 3 and is connected to the second passive element P2 in the middle and the second auxiliary antenna part 7 is connected . The third element 5 extends from the base end of the first element 3 and is connected to the ground plane GND at a position where the tip thereof is spaced apart from the feed point FP. In the middle of the third element 5, the third passive element P3 is connected.

The first auxiliary antenna unit 6 and the second auxiliary antenna unit 7 are formed of a flexible thin film conductor as shown in FIG. 1 (b) and FIG. 2, And is spaced apart from the substrate main body 2 with an interval therebetween. Spacers 8 are provided between the first auxiliary antenna unit 6 and the second auxiliary antenna unit 7 and the substrate main body 2.

The first auxiliary antenna unit 6 and the second auxiliary antenna unit 7 are patterned with a metal foil such as a copper foil on the insulating film 9. In the present embodiment, a flexible printed board having a copper foil constituting the first auxiliary antenna portion 6 and the second auxiliary antenna portion 7 is formed between the two polyimide films constituting the insulating film 9 have. Although the first auxiliary antenna unit 6 and the second auxiliary antenna unit 7 are connected to the first element 3 and the second element 4 by soldering, other connection structures may be employed.

The first element 3 includes a first extended portion E1 which is formed at a base end disposed on the ground plane GND side and which extends in a direction away from the ground plane GND, And a second extending portion E2 extending from the tip end of the first extending portion E1 to the direction along the ground surface GND (the side edge of the opposing ground surface GND).

The second element 4 has a third extending portion E3 extending from the base end of the first element 3 in a direction away from the first extending portion E1 and a third extending portion E3 extending from the base end of the first extending portion E3 And a fourth extending portion E4 extending in the direction away from the ground plane GND along the first extending portion E1 from the leading end.

The first auxiliary antenna unit 6 includes a fifth extending portion E5 extending from the front end of the second extending portion E2 toward the upper side of the substrate main body 2, And a sixth extending portion E6 extending from the leading end along the second extending portion E2. The second auxiliary antenna portion 7 includes a seventh extending portion E7 extending from the front end of the fourth extending portion E4 toward the upper side of the substrate main body 2 and a seventh extending portion E7 extending from the front end of the fourth extending portion E7 And an eighth extending portion E8 extending from the leading end along the sixth extending portion E6.

The first and second auxiliary antenna units 6 and 7 are set to have a wider line width than the first and second elements 3 and 4. Particularly, the sixth extending portion E6 and the seventh extending portion E7 are widely formed, thereby increasing the occupied area of the antenna and effectively utilizing the stray capacitance generated between the antenna element AT and each element It is also widespread. It is also preferable to dispose the auxiliary antenna portion corresponding to the low resonance frequency on the inner side (the side closer to the antenna element AT). That is, in this embodiment, the first auxiliary antenna unit 6 corresponding to the first frequency f1 in the lower frequency band is connected to the second auxiliary antenna unit 7 corresponding to the second frequency f2 in the higher frequency band Respectively. Thus, the first auxiliary antenna unit 6 corresponding to the first frequency f1, which is a low frequency band, is moved close to the antenna element AT and away from the RF circuit component or the casing provided on the ground plane GND .

The second extending portion E2 is extended at a distance from the ground plane GND so as to generate a stray capacitance between the second extending portion E2 and the ground plane GND and the antenna element AT is formed in the middle have. The third element 5 is extended from the first extending portion E1 on the opposite side to the second element 4 and is bent at the middle thereof to extend from the first extended portion E1 to the ground surface GND .

The open ends of the first auxiliary antenna unit 6 and the second auxiliary antenna unit 7 are disposed in directions opposite to each other. The open end of the first auxiliary antenna unit 6 is disposed in the opposite direction to the open end of the antenna element AT (the end on the distal end side of the second extended portion E2).

The substrate main body 2 is a general printed substrate, and in this embodiment, a main body of a printed substrate made of a rectangular glass epoxy resin or the like is employed.

The feeding point FP is connected to a feeding point of a high-frequency circuit (not shown) through a feeding means such as a coaxial cable. Examples of the power supply means include various structures such as a connector such as a coaxial cable and a receptacle, a connection structure in which contacts have a plate spring shape, a connection structure in which contacts have a pin probe shape or a pin shape, Can be employed. For example, when a coaxial cable is employed as the power feeding means, the ground line of the coaxial cable is connected to the base end side of the ground plane GND and the core wire of the coaxial cable is connected to the feed point FP.

The antenna element (AT) is a loading element which does not self-resonate at a desired resonance frequency. For example, as shown in Fig. 3, a conductor pattern 102 such as Ag is formed on the surface of a dielectric 101 such as ceramics Chip antenna. The antenna element AT may select elements having different lengths, widths, conductor patterns 102, etc., depending on the setting of the resonance frequency or the like, and may select the same element. The first passive element P1 through the third passive element P3 are, for example, an inductor, a capacitor or a resistor.

The first element 3, the second element 4, the first auxiliary antenna unit 6 and the second auxiliary antenna unit 7 are connected in parallel to each other by a stray capacitance between the stray capacitance between them and the ground plane GND And are spaced apart to provide a capacity. 4, the stray capacitance Ca between the first extended portion E1 and the fourth extended portion E4 and the stray capacitance Ca between the first auxiliary antenna portion 6 (mainly the sixth extended portion E6) The stray capacitance Cb between the first auxiliary antenna unit 6 and the seventh extended unit E7 and the stray capacitance Cc between the first auxiliary antenna unit 6 (mainly the sixth extended unit E6) and the eighth extended unit E8 And the stray capacitance Cd between the first auxiliary antenna unit 6 (mainly the sixth extension E6) and the antenna element AT and the stray capacitance Cd between the first auxiliary antenna unit 6 The stray capacitance Ce between the antenna element AT and the ground plane GND and the stray capacitance Cf between the antenna element AT and the ground plane GND and the stray capacitance Cf between the seventh extended portion E7 and the ground plane GND, GND and the stray capacitance Ch between the eighth extended portion E8 and the ground plane GND can be generated.

The spacer 8 is, for example, a rectangular parallelepiped or a plate-like body formed of a resin such as ABS, and is provided with an insulating adhesive or a double-sided seal. The thickness of the spacer 8 and the mounting position on the substrate main body 2 are determined according to the space of the mounting point of the antenna device 1 and the mounting position of the antenna element AT. 2, the spacer 8 is provided between the antenna element AT and the ground plane GND as a position spaced apart from the short side of the substrate main body 2, 2 auxiliary antenna portions 6 and 7 are bent and arranged when folded back. The first and second auxiliary antenna units 6 and 7 are fixed to the upper surface of the spacer 8 with an adhesive or a double-sided tape or the like via the insulating film 9.

Next, the resonance frequency in the antenna device 1 of the present embodiment will be described with reference to Fig.

In the antenna device 1 of the present embodiment, as shown in Fig. 5, the resonance frequency is doubled to the first resonance frequency f1 and the second resonance frequency f2. The first resonant frequency f1 is one of two resonant frequencies in a low frequency band (for example, 900 MHz band) and includes an antenna element AT, a first element 3, 6, and the stray capacitances Ca to Cf. The second resonance frequency f2 corresponds to a higher frequency band of the two resonance frequencies (for example, 1800 MHz band), and includes the first element 3, the second element 4, Is determined by the length of the antenna portion 7 and the stray capacitances Ca, Cb, Cc, Cg and Ch.

In addition, the final adjustment of the first resonance frequency f1 is flexibly adjustable using the first passive element P1. The final adjustment of the second resonance frequency f2 can be flexibly adjusted by using the second passive element P2.

The impedance at the first resonance frequency f1 is determined by the stray capacitances Ca to Cf. The impedance at the second resonance frequency f2 is determined by the stray capacitances Ca, Cb, Cc, Cg and Ch. Moreover, the final impedance adjustment can be flexibly performed using the third passive element P3 for each resonance frequency.

Therefore, the first resonance frequency f1 is adjusted mainly in the portion surrounded by the broken line A1 in Fig. The second resonance frequency f2 is adjusted mainly in a portion surrounded by the broken line A2 in Fig. As described above, in the antenna operation, not only the stray capacitance between the elements but also the stray capacitance between each element and the ground plane (GND) and the stray capacitance between the first element and the ground plane By using the stray capacitances of the two auxiliary antenna units 6 and 7 and the respective elements or the ground plane GND, miniaturization of the antenna occupied area can be realized.

As described above, in the antenna device 1 of the present embodiment, the first auxiliary antenna portion 6 and the second auxiliary antenna portion 7 are formed of flexible thin film conductors, The first and second auxiliary antenna units 6 and 7 and the ground surface (GND) on the substrate main body 2 are arranged at a predetermined resonance frequency, The stray capacitance generated between the antenna element (AT) of each loading element and each element can be effectively used to perform double-resonance.

Since the first auxiliary antenna unit 6 and the second auxiliary antenna unit 7 are formed of flexible thin film conductors and folded back together with the first auxiliary antenna unit 6 and the second auxiliary antenna unit 7, Even if the gap between the main body 2 and the first and second auxiliary antenna units 6 and 7 is changed by appropriately changing the gap of the mounting point or by arranging the first and second auxiliary antenna units 6 and 7 in a curved manner, . Particularly, the first and second auxiliary antenna units 6 and 7 are mounted on the substrate main body 2 side without mounting the antenna element AT and the passive elements, 6 and 7 can be sufficiently secured.

By selecting the antenna elements AT and the passive elements P1 to P3, it is possible to flexibly adjust the respective resonance frequencies and impedances to obtain an antenna device capable of two resonance according to applications, devices, and design conditions have. Further, it is possible to design the first and second auxiliary antenna units 6 and 7 and the extended shapes of the respective elements in the plane of the substrate main body 2, so that compared with the case of using a conventional dielectric block or a resin molded body, In addition, miniaturization and high performance can be achieved by selecting the antenna element (AT) which is a dielectric antenna. In addition, the cost due to the mold, the design change, and the like is not required, and low cost can be realized.

In addition, since the first auxiliary antenna portion 6 and the second auxiliary antenna portion 7 are patterned with the metal foil on the insulating film, high flexibility can be obtained and a material having a high dielectric constant can be suitably used The pattern shortening effect of the first and second auxiliary antenna units 6 and 7 can be obtained and it is possible to cope with the case where the desired frequency band is low or further miniaturization is demanded. In addition, a general-purpose flexible printed circuit board can be used, and it is possible to reduce the cost.

Alternatively, since the open ends of the first auxiliary antenna portion 6 and the second auxiliary antenna portion 7 are disposed to face each other in opposite directions, the portions having high impedance are reversed to each other, The stray capacitance generated between them can be effectively used. In addition, since the open end of the first auxiliary antenna unit 6 is disposed in the reverse direction with respect to the open end of the antenna element AT, the mutually high impedance parts are reversed to each other, The stray capacitance generated between them can be effectively used.

Since the spacers 8 are provided between the first auxiliary antenna unit 6 and the second auxiliary antenna unit 7 and the substrate main body 2, The distance between the second auxiliary antenna units 6 and 7 and the substrate main body 2 can be kept constant. By using the material of the spacer 8 as a high dielectric material, the pattern shortening effect of the first and second auxiliary antenna portions 6 and 7 can be obtained. Further, by adopting an elastic material such as rubber, it is possible to obtain a shock absorbing effect.

Example

Next, in the embodiment in which the antenna device according to the present embodiment was actually fabricated, the results of measurement for the case where the VSWR characteristics (voltage standing wave ratio) and the radiation pattern and the spacer condition in the two resonance frequencies at the respective resonance frequencies are changed Will be described with reference to Figs. 5 to 9. Fig.

Also, in each passive element, an inductor was used for both the first passive element P1: 10 nH, the second passive element P2: 1.5 nH, and the third passive element P3: 10 nH. The thickness of the spacer 8 was 6 mm. 5, the first resonant frequency f1 is 927.13 MHz, the VSWR is 1.17, the band width (VSWR? 3) is 82.9 MHz and the second resonant frequency f2 is 1848.97 , A VSWR of 1.28, and a bandwidth (VSWR? 3) of 593.1 MHz.

As for the measurement of the radiation pattern, the direction toward the ground plane GND as the extending direction of the first extending portion E1 is defined as the X direction, and the direction opposite to the extending direction of the second extending portion E2 is defined as the Y direction And the direction perpendicular to the surface of the substrate main body 2 is the Z direction. The vertical polarization, the horizontal polarization, and the power gain with respect to the YZ plane were measured at this time.

Fig. 6 shows the radiation pattern (YZ plane) at the first resonance frequency f1 in the 900 MHz band, and the average power gain was 0.4 dBi. Fig. 7 shows the radiation pattern (YZ plane) at the second resonance frequency f2 in the 1800 MHz band, and the average power gain was -0.4 dBi.

Next, the results of confirming the influence of the resonance frequency on the arrangement conditions of the first and second auxiliary antenna portions are shown in Figs. 8 and 9. Fig. 8 (a)). In the case where the thickness of the spacer 8 is 3 mm (Fig. 8 (b)), And the case where the thickness of the spacer 8 was set to 6 mm (FIG. 8 (c)) by vertically arranging the first and second resonant frequencies f1 and f2. The curvature arrangement means that the first and second auxiliary antenna units 6 and 7 are extended along the upper surface of the spacer 8 after extending from the substrate main body 2 upward in the curved state toward the oblique direction And the vertical arrangement refers to a case in which the first and second auxiliary antenna units 6 and 7 are extended along the upper surface of the spacer 8 after extending vertically upward from the substrate main body 2 .

8 (c)), the spacers 8 are arranged in the vicinity of the short side of the substrate main body 2 and in the vicinity of the antenna element AT) on the right side. As can be seen from this result, the resonance frequency of each arrangement is suppressed by a slight variation of about 900% of the frequency band of 900/1800 MHz, and the frequency variation with respect to the arrangement of the first and second auxiliary antenna units is small , It can be understood that it is easy to cope with each device to be mounted.

The present invention is not limited to the above-described embodiments and examples, and various modifications may be added within the scope of the present invention.

For example, although the antenna element is formed in the second extension portion in the above embodiment, the antenna element may also be formed in the fourth extension portion. In this case, the length of the second element can be shortened by the antenna element of the fourth extension portion, which is preferable in the case where the occupied area of the antenna is narrow. In addition, the stray capacitance Ca can be increased by adopting the antenna element to the fourth extension portion.

Although it is preferable to form the first and second auxiliary antenna portions using the flexible printed circuit board as in the above embodiment, it may be formed of another flexible conductor thin film. For example, a thin glass epoxy substrate having flexibility may be used, and the first and second auxiliary antenna portions may be patterned with a metal foil such as a copper foil.

In the above embodiment, the flexible printed circuit board on which the first and second auxiliary antenna portions are formed is mounted on the spacer and is provided above the substrate main body. However, as another example, as shown in Fig. 10, The flexible printed circuit board on which the first and second auxiliary antenna units 6 and 7 are formed is adhered to the inner surface of the casing 20 such as a communication apparatus in which the antenna apparatus is built with an adhesive, It may be provided so as to extend upwardly of the main body 2.

1: Antenna device
2: substrate body
3: first element
4: second element
5: third element
6: First auxiliary antenna unit
7: Second auxiliary antenna unit
8: Spacer
AT: Antenna element
E1: first extension
E2:
E3: third extension part
E4: fourth extension part
E5: Fifth extension
E6: sixth extension
E7: seventh extension part
E8: Eighth extension part
GND: Ground plane
P1: first passive element
P2: second passive element
P3: Third passive element
FP: feed point

Claims (6)

A ground plane, a first element and a second element, each of which is patterned in the form of a metal foil on the substrate body,
Wherein the first element has a feeding point formed at a base end disposed on the ground plane side and extended, a first antenna element connected to the antenna element of the dielectric antenna and a first auxiliary antenna section connected to the tip, And a second auxiliary antenna unit connected to the distal end of the first auxiliary antenna unit and the second auxiliary antenna unit, wherein the first auxiliary antenna unit is connected to the base end side of the first element, And is folded back so as to be spaced apart from the substrate main body at an upper portion of the substrate main body. The method according to claim 1,
Wherein the first auxiliary antenna portion and the second auxiliary antenna portion are formed in a patterned metal foil on the insulating film. The method according to claim 1,
Wherein the first auxiliary antenna unit and the second auxiliary antenna unit have open ends disposed in directions opposite to each other. The method according to claim 1 or 3,
Wherein an open end of the first auxiliary antenna section is disposed in a direction opposite to an open end of the antenna element. The method according to claim 1,
Wherein a spacer is provided between the first auxiliary antenna portion and the second auxiliary antenna portion and the substrate main body. The method according to claim 1,
And a third element that is patterned with a metal foil on the substrate body and extends from a base end of the first element and is connected to the ground surface at a position where the tip is spaced apart from the feed point, A first extending portion formed at a base end disposed on the ground plane side and extending in a direction away from the ground plane, and a second extending portion extending from the leading end of the first extending portion in a direction along the ground plane Wherein the second element has a third extending portion extending from a base end of the first element in a direction away from the first extending portion and a second extending portion extending from the tip of the third extending portion along the first extending portion, And a fourth extending portion extending in a direction away from the first auxiliary antenna portion, A fifth extending portion extending from the distal end of the second extending portion toward the upper side of the substrate main body and a sixth extending portion extending from the distal end of the fifth extending portion along the second extending portion, A seventh extending portion extending from the tip end of the fourth extending portion toward the upper side of the substrate main body and an eighth extending portion extending from the tip end of the seventh extending portion along the sixth extending portion, And the antenna element is formed in the middle of the antenna while being spaced apart from the ground plane so as to generate a stray capacitance with the ground plane.
KR1020157019503A 2013-01-18 2013-01-18 Antenna device KR101970861B1 (en)

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WO2018004169A1 (en) 2016-07-01 2018-01-04 김미정 Rf passive device and miniaturization method therefor
US11862838B2 (en) 2020-04-17 2024-01-02 Apple Inc. Electronic devices having wideband antennas

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HK1209906A1 (en) 2016-04-08
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CN104854756B (en) 2017-11-14
WO2014111975A1 (en) 2014-07-24

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