WO2014064927A1 - アンテナ - Google Patents
アンテナ Download PDFInfo
- Publication number
- WO2014064927A1 WO2014064927A1 PCT/JP2013/006255 JP2013006255W WO2014064927A1 WO 2014064927 A1 WO2014064927 A1 WO 2014064927A1 JP 2013006255 W JP2013006255 W JP 2013006255W WO 2014064927 A1 WO2014064927 A1 WO 2014064927A1
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- Prior art keywords
- antenna
- gnd
- circuit
- loop
- supply unit
- Prior art date
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Classifications
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- 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
- H01Q9/06—Details
- H01Q9/065—Microstrip dipole antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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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
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- 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
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- 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
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/328—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors between a radiating element and ground
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- 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
- H01Q5/378—Combination of fed elements with parasitic elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
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- 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
Definitions
- the present disclosure relates to an antenna capable of suppressing noise and improving radiation characteristics.
- a dipole antenna is configured using a part of the circuit GND, and the influence of noise. Can be reduced.
- the receiver is generally mounted in the passenger compartment.
- an electric field antenna such as a dipole or a monopole is used.
- isolation is ensured by arranging both antennas spatially apart or adding a circuit (such as a balanced / unbalanced conversion circuit) for securing isolation (for example, , See Patent Document 2).
- a circuit such as a balanced / unbalanced conversion circuit
- the conventional antenna has a problem that one end of the antenna element is short-circuited to the circuit GND which is a noise source, and the circuit GND noise is superimposed on the antenna element.
- the antenna element is completely opened from the circuit GND, there is a problem in that the antenna element operates as a dipole antenna and cannot receive radio waves.
- the present disclosure has been made in view of such problems, and an object thereof is to provide an antenna capable of suppressing noise and improving radiation characteristics.
- the antenna according to the first aspect of the present disclosure includes a power feeding unit, a first element, a second element, a third element, and a fourth element.
- the power supply unit includes a GND and a power supply unit, and the first element is connected to the power supply unit GND, and is disposed on the same plane as the radio circuit GND and electrically separated from the radio circuit GND.
- the antenna element having a predetermined area.
- the second element is an antenna element having a predetermined electrical length, one end connected to the first element, the other end being an open terminal, and being arranged on the same plane as the GND of the radio circuit.
- One end of the third element is connected to the power supply unit of the power supply unit, and the first element is arranged substantially perpendicular to the first element in the region occupied by the first element, with one end to which the power supply unit is connected facing down. , An antenna element having a predetermined height.
- the fourth element has one end connected to the other end of the third element, the other end being an open end, substantially parallel to the first element, and one end connected to the first element of the second element;
- Such an antenna is composed of the first to fourth elements as described above, and since a spatial and electrical isolation is ensured between the antenna and the GND of the radio circuit, the radio circuit With respect to the noise superimposed from the GND, a balanced dipole structure is formed.
- the antenna gain can be maximized by making the area of the first element equal to or larger than the area of the circle whose radius is the height of the third element.
- the gain of the antenna can be maximized by setting the total length of the electrical lengths of the second element, the third element, and the fourth element to 1 ⁇ 2 of the wavelength of radio waves to be transmitted and received.
- the antenna can include a fifth element having one end connected to the fourth element and the other end connected to the first element via a capacitive element.
- direction characteristic of an antenna can be changed with the magnitude
- the capacitive element is a variable capacitor, the orientation characteristics of the antenna can be easily changed.
- the antenna is disposed in close proximity to one side of at least one of the first to fourth elements, forms a loop via a capacitor, and is electrically connected to GND and the first to fourth elements.
- a separate parasitic loop antenna may be provided.
- arranged in close proximity to one side of at least one of the first to fourth elements means each element of the electric field antenna composed of GND and the first to fourth elements and a non-paid loop This means that the antennas are arranged within a distance where the magnetic fields of the antennas are interlinked.
- the drawing It is a figure which shows the schematic structure of the antenna in 1st Embodiment. It is a figure for demonstrating the effect of the antenna in 1st Embodiment. It is a figure for demonstrating the effect of the antenna in 1st Embodiment. It is a figure for demonstrating the effect of the antenna in 1st Embodiment. It is a figure which shows the schematic structure of the antenna in 2nd Embodiment. It is a figure for demonstrating the effect of the antenna in 2nd Embodiment. It is a figure for demonstrating the effect of the antenna in 2nd Embodiment.
- FIG. 1 is a diagram illustrating a schematic configuration of an antenna 1 to which the present disclosure is applied.
- the antenna 1 includes a power feeding unit 60, a first element 10, a second element 20, a third element 30, and a fourth element 40, which are provided on one substrate 70. .
- the power feeding unit 60 is a part for inputting / outputting radio waves to be transmitted / received to / from the antenna 1, and includes a GND 62 and a power supply unit 64, and a transmission radio wave is input between the GND 62 and the power supply unit 64 from a wireless circuit. Or by transmitting / receiving radio waves to / from the radio circuit from between the GND 62 and the power supply unit 64.
- the first element 10 is connected to the GND 62 of the power feeding unit 60 and is a square flat plate disposed on the same plane as the GND 72 of the wireless circuit to which the antenna 1 is connected and electrically separated from the GND 72 of the wireless circuit. Antenna element.
- the first element 10 is a square, but it is not particularly necessary to be a square. If the area of the first element 10 is equal to or larger than the area of a circle whose radius is the height of the third element 30, Even if the shape is not a square, it may be, for example, a circular shape in accordance with various conditions and restrictions at the time of manufacturing the substrate.
- the second element 20 is a rectangular flat antenna element having a short side and a long side, and is arranged on the same plane as the GND 72 of the radio circuit. One end (one short side) is connected to the first element 10, and the other end (the other short side) is an open end.
- one end of the bar-shaped antenna element is connected to the power supply unit 64 of the power supply unit 60, and the one end to which the power supply unit 64 is connected is down (first element side). Is disposed substantially perpendicular to the first element 10.
- the fourth element 40 has one end of a bar-shaped antenna element connected to the other end (upper end) of the third element 30, the other end being an open end, substantially parallel to the first element 10, and the second element 20.
- the first element 10 is disposed at a substantially right angle to a line connecting one end and the other end connected to the first element 10.
- the total of the electrical length of the long side of the second element 20, the electrical length of the third element 30 in the height direction, and the electrical length of the fourth element 40 in the longitudinal direction is 1 / wavelength of the radio wave transmitted and received by the antenna 1. 2
- the substrate 70 is provided with a flat plate-like GND 72 of a radio circuit.
- a gap is provided between the GND 72 of the wireless circuit and the first element 10 and the second element 20 so as to electrically separate the GND 72 of the wireless circuit from the first element 10 and the second element 20. .
- an IC 74 is mounted on the GND 72 of the radio circuit of the substrate 70, and this is a conductive noise source.
- FIGS. 2A to 2C show the performance of the antenna and the antenna 1 according to the related art when noise in the vicinity of 433.9 [MHz] is generated from the IC 74 (see FIG. 1) which is a noise source.
- the horizontal axis indicates the frequency and the vertical axis indicates the noise level.
- the graph indicated by “A” indicates the noise in the conventional antenna, and the graph indicated by “B” indicates the antenna 1 Noise is shown.
- the antenna 1 has a balanced dipole structure composed of the first element 10 to the fourth element 40, so that there is spatial and electrical isolation between the antenna 1 and the GND 72 of the radio circuit. This is because it is secured.
- the area of the first element 10 is 1256 [mm 2], that is, the area of the first element 10 is not less than the area having the electric length 20 [mm] of the second element 20 as a radius. It can be seen that the electric field in the Z-axis direction is strongly formed.
- the antenna according to the prior art cannot form an electric field in the triaxial direction (X, Y, Z direction), and the insensitive direction occurs, whereas the antenna 1
- the antenna 1 As indicated by “D” in FIG. 2C, an electric field is formed in the triaxial direction, and the insensitive direction is improved.
- the antenna 1 operates as a balanced antenna with respect to the noise source (IC 74), functions to suppress noise superposition, and incorporates the operation of an unbalanced antenna such as a monopole antenna.
- the antenna structure improves the radiation characteristics.
- the area of the first element 10 is equal to or larger than the area of a circle whose radius is the height of the third element 30, the gain of the antenna 1 is maximized.
- the antenna 2 includes a fifth element 50 in addition to the first element 10 to the fourth element 40 of the antenna 1 according to the first embodiment.
- the long side end of the L-shaped antenna element is connected to the fourth element 40, and the short side end is connected to the first element 10 via the variable capacitor 52.
- the transmission / reception frequency of the antenna 2 is 433 [MHz] and the capacitance of the variable capacitor 52 is 1 [pF], as shown in FIG. 4A, between the first element 10 and the fifth element 50, 368 [ ⁇ ] isolation is ensured, and the current of the antenna 2 in FIG. 4A is concentrated on the third element 30 and the fourth element 40 as indicated by arrows in FIG. 4A.
- the antenna 2 operates as a dipole antenna and can obtain the same effects (noise suppression and radiation characteristics) as the antenna 1 in the first embodiment as shown in FIG.
- “A” indicates the radiation characteristic of the antenna 2 by “B”).
- the capacitance of the variable capacitor 52 is 50 [pF]
- the first element 10 and the fifth element 50 are substantially in a conductive state (7 [ ⁇ ])
- the current flowing through the antenna 2 is indicated by an arrow in FIG. 4C.
- the current distribution is such that a loop antenna is formed in a part of the dipole antenna.
- the capacitance of the variable capacitor 52 by changing the capacitance of the variable capacitor 52, the main radiation direction of the radio wave of the antenna 2 can be changed as indicated by “C” in FIG. 4D.
- the capacitance of the variable capacitor 52 is converted into a digital value by the A / D converter 84 while the received voltage of the antenna 2 is monitored by the voltage detection circuit 82 by the electronic circuit 80, for example.
- the active characteristic of the antenna 2 can be always optimized by actively controlling the control circuit 86 such that the received voltage is maximized.
- FIG. 5A and 5B are diagrams illustrating schematic configurations of the antenna 3 and the antenna 4 of the third embodiment.
- the antenna 3 includes the antenna 1 and the loop antenna 100 of the first embodiment.
- the loop antenna 100 includes a loop element 102 and a capacitor 104.
- a conductor is formed in a substantially rectangular shape, a central portion of one side (bottom side) in the longitudinal direction is cut out and spatially separated, and a capacitor 104 is connected in series to the portion. Yes.
- the loop antenna 100 is arranged so that its longitudinal direction coincides with the direction of the fourth element 40 of the antenna 1 and close to the fourth element 40.
- the loop antenna 100 may be placed in parallel to the plane of the first element 10 and the second element 20, or the direction of the third element 30 and the longitudinal direction or short of the loop antenna 100. You may make it adjoin so that a hand direction may correspond.
- placed close to each other means that the first element 10 to the fourth element 40 of the antenna 1 and the loop antenna 100 are arranged within a distance where the mutual magnetic fields of the loop antenna 100 are linked.
- the antenna 4 includes an electric field antenna based on the antenna 2 of the second embodiment and a loop antenna 100.
- the element 41 and the element 42 are arranged in the direction of the substrate 70 (in the vertical direction as in the third element 30) from the central portion and the tip portion of the fourth element 40 of the basic antenna 2. Is provided.
- the loop antenna 100 is the same antenna as the loop antenna 100 of the antenna 3, and the position where the loop antenna 100 is disposed is the same as that of the antenna 3.
- “arranged in close proximity to one side of at least one of the first to fourth elements” means each element of the electric field antenna composed of GND and the first to fourth elements 10 to 40 And the non-paid loop antenna (100) are arranged within a distance where the mutual magnetic fields are interlinked.
- the antennas 1 and 2 are so-called electric field antennas
- the loop antenna 100 is a so-called magnetic field antenna.
- the GND of the electric field antenna (the antennas 1 and 2 including the GND and the first to fourth elements) and the magnetic field antenna (the parasitic loop antenna (100)) can be separated without providing a balance-unbalance conversion circuit. It is possible to prevent mutual interference through the.
- FIGS. 6A-C show the characteristics of the antenna 4.
- the inductor component of the fourth element 40 and the loop antenna 100 are magnetically coupled to make two resonances as shown in FIG. 6A.
- One of the two resonance points (a point having a frequency of 421 [MHz] in FIG. 6A) is a resonance point by the antenna 2 (electric field antenna), and the other resonance point (382 [ [ [MHz] is the resonance by the loop antenna 100 (magnetic field antenna).
- FIG. 6C a large current distribution is seen in the antenna 2 at the frequency 421 [MHz], and as shown in FIG. 6B, a large current distribution is found in the loop antenna 100 at the frequency 382 [MHz]. It can be seen that each is resonating, that is, good transmission / reception is possible at each frequency.
- FIGS. 7A to 7C an antenna 5 that switches between the antenna 2 that is the electric field antenna of the antenna 4 and the loop antenna 100 that is the magnetic field antenna in the third embodiment will be described.
- 7A to 7C are diagrams showing a schematic configuration and directivity of the antenna 5 in the fourth embodiment.
- the antenna 5 is provided with a receiving circuit 12, a switch 14, a first matching circuit 16, and a second matching circuit 18 in the portion of the first element 10 of the antenna 4 of the third embodiment. .
- the receiving circuit 12 is a circuit for receiving radio waves received by the antenna 2 which is an electric field antenna constituting the antenna 4 and the loop antenna 100 which is a magnetic field antenna.
- the switch 14 is provided between the first matching circuit 16 and the second matching circuit 18 and the receiving circuit 12, and is connected to the first matching circuit 16 (that is, the antenna 2) and the first matching circuit 16 by a signal from the control circuit 86 (see FIG. 3).
- This is a high-frequency switch for selecting either or both of the two matching circuits 18 (that is, the loop antenna 100) and connecting them to the receiving circuit 12.
- the first matching circuit 16 prevents high frequency reflection between the antenna 2 and the receiving circuit 12. Circuit.
- the second matching circuit 18 is used for electrical matching, such as preventing high-frequency reflection between the loop antenna 100 and the receiving circuit 12. It is a high frequency circuit.
- either or both of the antenna 4 and the loop antenna 100 can be selected by a signal from the control circuit 86. That is, by appropriately selecting the first matching circuit 16 and the second matching circuit 18, the electric field antenna (antenna 2) and the magnetic field antenna (loop antenna 100) can be operated at a predetermined frequency.
- FIG. 7B and 7C show the directivity in the plane when the antenna 5 is operated at a frequency of 433 [MHz].
- the directivity of loop antenna 100 alone that is, the directivity when operated as a magnetic field antenna is as shown in FIG. 7B
- the directivity of antenna 2 alone that is, when operated as an electric field antenna.
- the directivity is as shown in FIG. 7C.
- FIGS. 8A to 8C The directivity when the antenna 5 is operated at 433 [MHz] is shown in FIGS. 8A to 8C.
- the center of the figure is the position of the vehicle on which the antenna 5 is mounted, and the numbers around the pie chart indicate the phase of 0 to 360 degrees with the front of the vehicle being 0 degrees.
- a thin solid line indicates the directivity of the antenna 5 when the loop antenna 100 is not operated (that is, when the second matching circuit 18 is not selected by the switch 14), and the dark solid line (Indicated by “B” in FIG. 8A) is the directivity of the antenna 5 when the loop antenna 100 is operated (that is, when both the first matching circuit 16 and the second matching circuit 18 are selected by the switch 14). Is shown.
- FIG. 8B shows the phase difference at the Null point corresponding to FIG. 8A.
- FIG. 8C shows phase difference values for the circled numbers in FIGS. 8A and 8B.
- the Null generated in the electric field antenna can be interpolated by the directivity of the magnetic field antenna (loop antenna 100).
- the phases at that time are each shifted by 90 degrees, and it can be seen that an electric field and a magnetic field can be received.
- the antenna 6 of 5th Embodiment is demonstrated based on FIG. 9A, FIG. 9B, FIG. 10A, and FIG. 10B.
- the antenna 6 includes an antenna 200 and a loop antenna 300.
- the antenna 200 is an electric field antenna, and has a length up to the substrate 70 parallel to the third element 30 at the tip of the fourth element 40 of the antenna 1 of the first embodiment, that is, in a direction perpendicular to the first element 10.
- An element 202 is provided.
- the loop antenna 300 has a gate shape (U shape), and includes two elements 301 and 302 provided in a direction perpendicular to the substrate 70, and the elements 301 and 302. Are connected at the upper end.
- the antenna 200 is connected to the substrate 70 from the end of the GND 72 through a capacitor such as a capacitor (capacitor 204 in FIG. 9B). It is electrically connected to the GND 72.
- the lower end of the element 301 is installed on the first element 10 so as to be electrically short-circuited, and the lower end of the element 302 and the element 202 of the antenna 200 are connected by a land 304 formed of a conductive material. ing.
- FIG. 10A The current vector at the frequency 312 [MHz] of the antenna 6 having the above configuration is shown in FIG. 10A.
- the loop antenna 300 that is a magnetic field antenna has a large current distribution, that is, the loop antenna. It can be seen that 300 is resonating.
- FIG. 10B shows the directivity of the antenna 1 and the antenna 6 with respect to the frequency 433 [MHz].
- a thin solid line (indicated by “B” in FIG. 10B) indicates the directivity of the antenna 1
- a dark solid line indicates the directivity of the antenna 6.
- FIG. 10B it can be seen that the directivity of the antenna 6 is improved compared to the antenna 1.
- the overall average gain of the antenna 1 is ⁇ 10.5 [dBi]
- the average average gain of the antenna 6 is ⁇ 8.9 [dBi]. It can be seen that the transmission / reception characteristics of the antenna 6 are improved compared to FIG.
- FIG. 11 shows the characteristics of the induced electric power of the antenna when the antenna 6 is mounted on the vehicle.
- the characteristic of the antenna 6 is indicated by a dark solid line (indicated by “A” in FIG. 11)
- the characteristic of the antenna 1 (electric field antenna) is indicated by a thin solid line (indicated by “B” in FIG. 11).
- FIG. 12A shows an antenna 7 in which a plurality of (two in FIG. 12A) loop antennas 100 of the antenna 4 of the third embodiment are installed.
- FIG. 12B shows an antenna 8 in which one loop antenna 100 is arranged in parallel and close to each of the fourth element 40 and the fifth element 50 of the antenna 2 of the second embodiment.
- FIG. 13A shows an antenna 3a in which the first element 10, the second element 20 and the substrate GND of the antenna 1 constituting the antenna 3 of the third embodiment are integrated to form a monopole electric field antenna.
- the loop antenna 100 which is a monopole electric field antenna and a magnetic field antenna, is less susceptible to the effects of GND noise and can be a highly directional antenna.
- FIG. 13B shows an antenna 6a in which the first element 10, the second element 20, and the substrate GND of the antenna 200 constituting the antenna 6 of the fifth embodiment are integrated to form an electric field antenna.
- the loop antenna 100 which is an electric field antenna and a magnetic field antenna, is less susceptible to the effects of GND noise and can be a highly directional antenna.
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Abstract
Description
(第1実施形態)
(アンテナ1の構成)
図1は、本開示が適用されたアンテナ1の概略の構成を示す図である。図1に示すようにアンテナ1は、給電部60、第1エレメント10、第2エレメント20、第3エレメント30及び第4エレメント40を備えており、それらが1つの基板70上に設けられている。
次に、図2A-Cに基づき、アンテナ1の効果について説明する。図2A-Cは、ノイズ源となるIC74(図1参照)から、433.9[MHz]近傍のノイズが発生している場合の従来技術のアンテナとアンテナ1の性能を示したものである。
(第2実施形態)
(アンテナ2の構成)
次に、第1実施形態のアンテナ1に、第5エレメント50を追加した第2実施形態のアンテナ2の構成について、図3に基づき説明する。
以上のような構成を有するアンテナ2では、可変容量キャパシタ52の容量の大きさによって、アンテナ2の方位特性を変化させることができる。
(第3実施形態)
(アンテナ3,4の構成)
次に、図5A及び5Bに基づき第3実施形態におけるアンテナ3及びアンテナ4の構成について説明する。図5A及び5Bは、第3実施形態のアンテナ3及びアンテナ4の概略の構成を示す図である。
次に、上記のような構成を有するアンテナ3及びアンテナ4の特徴について説明する。アンテナ3,4において、アンテナ1,2は、いわゆる電界アンテナであり、ループアンテナ100は、いわゆる磁界アンテナである。
(第4実施形態)
次に、図7A-Cに基づき、第3実施形態におけるアンテナ4の電界アンテナであるアンテナ2と磁界アンテナであるループアンテナ100とを切り替えるようにしたアンテナ5について説明する。図7A-Cは、第4実施形態におけるアンテナ5の概略の構成と指向性を示す図である。
以上のような構成のアンテナ5では、制御回路86からの信号によりアンテナ4とループアンテナ100のいずれか又はその両方を選択できる。つまり、第1整合回路16及び第2整合回路18を適切に選択することで、電界アンテナ(アンテナ2)と磁界アンテナ(ループアンテナ100)とを所定の周波数で動作可能とすることができる。
(第5実施形態)
次に、図9A、図9B、及び図10A、図10Bに基づき、第5実施形態のアンテナ6について説明する。図9Aに示すように、アンテナ6は、アンテナ200とループアンテナ300とを備えている。
以上のような構成のアンテナ6の周波数312[MHz]における電流ベクトルを図10Aに示す、図10Aに示すように、磁界アンテナであるループアンテナ300に多くの電流分布があること、つまり、ループアンテナ300が共振していることが分かる。
(その他の実施形態)
図12Aに、第3実施形態のアンテナ4のループアンテナ100を複数(図12Aでは2つ)重ねて設置したアンテナ7を示す。また、図12Bに第2実施形態のアンテナ2の第4エレメント40と第5エレメント50のそれぞれに各1個のループアンテナ100を並列に近接配置したアンテナ8を示す。
Claims (6)
- GND(62)及び電力供給部(64)を有する給電部(60)と、
前記給電部のGNDと接続され、無線回路のGND(72)と同一平面上に、前記無線回路のGNDと電気的に分離して配置された、所定の面積を有する第1エレメント(10)と、
一端が前記第1エレメントに接続され、他端が開放終端であり、前記無線回路のGNDと同一平面上に配置された、所定の電気長を有する第2エレメント(20)と、
一端が前記給電部の電力供給部に接続され、該電力供給部が接続された一端を下として、前記第1エレメントの占める領域内に、前記第1エレメントに対し略垂直に配置された、所定の高さを有する第3エレメント(30)と、
一端が前記第3エレメントの他端と接続され、他端が開放終端であり、前記第1エレメントと略平行、かつ、前記第2エレメントの前記第1エレメントに接続されている一端と他端とを結ぶ線と略直角に配置された、所定の電気長を有する第4エレメント(40)と、
を備えたアンテナ。 - 請求項1に記載のアンテナにおいて、
前記第1エレメントの面積は、前記第3エレメントの高さを半径とする円の面積以上であるアンテナ。 - 請求項1又は請求項2に記載のアンテナにおいて、
前記第2エレメント、前記第3エレメント及び前記第4エレメントの電気長の合計の長さは、送受信する電波の波長の1/2であるアンテナ。 - 請求項1~請求項3のいずれか1項に記載のアンテナにおいて、
一端が前記第4エレメントに接続され、他端が容量素子(52)を介して前記第1エレメントに接続された第5エレメント(50)を備えたアンテナ。 - 請求項4に記載のアンテナにおいて、
前記容量素子は、可変容量キャパシタであるアンテナ。 - 請求項1~請求項5のいずれか1項に記載のアンテナにおいて、
前記第1~第4エレメントのうち少なくとも1つのエレメントの1辺に近接対向して配置され、キャパシタ(51)を介してループを構成するとともに、前記GND(72)及び前記第1~第4エレメントと電気的に分離した無給電ループアンテナ(100)を備えたアンテナ。
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US14/436,124 US9692133B2 (en) | 2012-10-24 | 2013-10-23 | Antenna |
KR1020157009237A KR101713890B1 (ko) | 2012-10-24 | 2013-10-23 | 안테나 |
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JP2013215644A JP6181507B2 (ja) | 2012-10-24 | 2013-10-16 | アンテナ |
JP2013-215644 | 2013-10-16 |
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EP3203578B1 (en) * | 2014-10-03 | 2020-12-30 | AGC Inc. | Antenna device |
JP6426564B2 (ja) * | 2015-08-31 | 2018-11-21 | 株式会社ヨコオ | カード型電子装置 |
CN109075450B (zh) | 2016-04-15 | 2021-08-27 | Agc株式会社 | 天线 |
JP2020150424A (ja) * | 2019-03-14 | 2020-09-17 | ソニーセミコンダクタソリューションズ株式会社 | アンテナ装置 |
Citations (3)
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JPH0279602A (ja) * | 1988-09-16 | 1990-03-20 | Nippon Telegr & Teleph Corp <Ntt> | マイクロストリップアンテナ |
JP2007081712A (ja) * | 2005-09-13 | 2007-03-29 | Toshiba Corp | 携帯無線機およびアンテナ装置 |
WO2012070242A1 (ja) * | 2010-11-25 | 2012-05-31 | パナソニック株式会社 | 無線機 |
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JP3296189B2 (ja) * | 1996-06-03 | 2002-06-24 | 三菱電機株式会社 | アンテナ装置 |
JP2004048471A (ja) * | 2002-07-12 | 2004-02-12 | Tdk Corp | 機器内蔵gnd実装アンテナ |
JP2004064312A (ja) | 2002-07-26 | 2004-02-26 | Matsushita Electric Ind Co Ltd | 携帯無線機用アンテナ装置 |
JP2004096341A (ja) * | 2002-08-30 | 2004-03-25 | Fujitsu Ltd | 共振周波数が可変な逆f型アンテナを含むアンテナ装置 |
JP4008887B2 (ja) * | 2004-01-28 | 2007-11-14 | 三菱電機株式会社 | 無線端末装置 |
KR20060035999A (ko) | 2004-10-23 | 2006-04-27 | 엘지전자 주식회사 | 이동통신 단말기의 내장형 안테나 |
JP2007124182A (ja) | 2005-10-27 | 2007-05-17 | Matsushita Electric Ind Co Ltd | 固体撮像素子およびその駆動方法、撮像装置 |
JP2007124181A (ja) | 2005-10-27 | 2007-05-17 | Matsushita Electric Ind Co Ltd | Rf回路モジュールおよび移動体通信機器 |
JP4688068B2 (ja) * | 2006-06-29 | 2011-05-25 | 三菱マテリアル株式会社 | アンテナ装置 |
JP4863378B2 (ja) * | 2006-12-05 | 2012-01-25 | 独立行政法人情報通信研究機構 | アンテナ装置 |
JP5451169B2 (ja) * | 2008-05-15 | 2014-03-26 | 三菱電線工業株式会社 | アンテナ装置 |
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- 2013-10-16 JP JP2013215644A patent/JP6181507B2/ja active Active
- 2013-10-23 KR KR1020157009237A patent/KR101713890B1/ko active IP Right Grant
- 2013-10-23 US US14/436,124 patent/US9692133B2/en not_active Expired - Fee Related
- 2013-10-23 WO PCT/JP2013/006255 patent/WO2014064927A1/ja active Application Filing
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0279602A (ja) * | 1988-09-16 | 1990-03-20 | Nippon Telegr & Teleph Corp <Ntt> | マイクロストリップアンテナ |
JP2007081712A (ja) * | 2005-09-13 | 2007-03-29 | Toshiba Corp | 携帯無線機およびアンテナ装置 |
WO2012070242A1 (ja) * | 2010-11-25 | 2012-05-31 | パナソニック株式会社 | 無線機 |
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US9692133B2 (en) | 2017-06-27 |
US20150270614A1 (en) | 2015-09-24 |
KR101713890B1 (ko) | 2017-03-09 |
JP2014103660A (ja) | 2014-06-05 |
JP6181507B2 (ja) | 2017-08-16 |
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