WO2008051043A1 - Petite antenne à résonances multiples et lignes d'alimentation multiples - Google Patents

Petite antenne à résonances multiples et lignes d'alimentation multiples Download PDF

Info

Publication number
WO2008051043A1
WO2008051043A1 PCT/KR2007/005301 KR2007005301W WO2008051043A1 WO 2008051043 A1 WO2008051043 A1 WO 2008051043A1 KR 2007005301 W KR2007005301 W KR 2007005301W WO 2008051043 A1 WO2008051043 A1 WO 2008051043A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
feeder
feeders
antenna element
small
Prior art date
Application number
PCT/KR2007/005301
Other languages
English (en)
Inventor
Je-Hoon Yun
Original Assignee
Electronics And Telecommunications Research Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electronics And Telecommunications Research Institute filed Critical Electronics And Telecommunications Research Institute
Priority to EP07833610.4A priority Critical patent/EP2087552A4/fr
Publication of WO2008051043A1 publication Critical patent/WO2008051043A1/fr

Links

Classifications

    • 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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
    • H01Q9/27—Spiral antennas
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
    • 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
    • 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
    • H01Q5/335—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 at the feed, e.g. for impedance matching
    • 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
    • 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
    • H01Q9/14—Length of element or elements adjustable
    • H01Q9/145—Length of element or elements adjustable by varying the electrical length

Definitions

  • the present invention relates to a small antenna with multifold resonances and multiple feeders; and, more particularly, to a small antenna with multifold resonances and multiple feeders, which is capable of multi-band transmission/reception by installing, within one antenna, a plurality of feeders that can vary the total length of the antenna (which is a length from a feed point up to an antenna end) .
  • a miniaturization technology for, e.g., a terminal, a relay and a base station is drawing much attention.
  • an antenna miniaturization technology for making a protruding portion of an antenna small or installing an antenna within a portable terminal is being developed to improve portability.
  • an antenna generally has a narrowband characteristic, and its efficiency is deteriorated if the antenna is miniaturized. That is, if the antenna is miniaturized, an antenna radiation pattern has an omnidirectional characteristic, and an antenna gain decreases. Also, the input resistance of the antenna significantly decreases and reactance significantly increases, thereby reducing a bandwidth of the antenna to a great extent.
  • Fig. 1 is a view illustrating an example of a maximum radius of an antenna.
  • a maximum radius 1-1 of a monopole antenna and a maximum radius 1-2 of a dipole antenna are illustrated.
  • the maximum bandwidth BWmax that can be obtained from an antenna having the maximum radius a which refers to a distance from a point where a ground meets an antenna element (which is a conductor) up to an end of an antenna element in the case of the monopole antenna, and a distance from a feed point up to an end of the antenna element in the case of the dipole antenna, is expressed as the following Equation:
  • k denotes a wave number, which is 2p/l (in which 1 is a wavelength) .
  • the maximum bandwidth without loss is about 5.5%.
  • a frequency band being used for a T-DMB in Korea ranges from 174 MHz to 216 MHZ, and thus a bandwidth of about 22 % is required. For this reason, it is difficult to receive a T-DMB signal with one small antenna, and thus it is required to develop a small antennal having a wideband characteristic by generating a plurality of resonant frequencies is required.
  • Fig. 2 is a view illustrating a T-DMB frequency bandwidth and a channel bandwidth that are currently being used.
  • the T-DMB frequency bandwidth includes a plurality of channel bandwidths.
  • the T-DMB frequency bandwidth is 42 MHz, one channel bandwidth is 1.536 MHz, which is very narrow.
  • a channel bandwidth of another channel is not used. For this reason, wideband reception that allows the use of multiple channels can be performed using one small antenna.
  • multi-channel reception in one small antenna can be performed.
  • wideband reception using the small antenna can be achieved.
  • the bandwidth of the small antenna must be wider than a channel bandwidth of Fig. 2.
  • a loss of an antenna element is caused, or a thick or parasitic element is used.
  • the loss of the antenna element causes antenna efficiency to degrade.
  • the thick element cannot fundamentally overcome a limited bandwidth resulting from miniaturization of an antenna.
  • the parasitic element also limitedly improves the bandwidth.
  • An embodiment of the present invention is directed to providing a small antenna that allows multiband, i.e., wideband transmission/reception by independently generating multifold resonances, using a plurality of feeders.
  • an antenna including: an antenna element; a plurality of feeders for supplying power to the antenna element; and a feed switch for selectively connecting one of the feeders with the antenna element to supply power to the antenna element, wherein the feeders are disposed to vary a total length of the antenna element.
  • the present invention provides a small antenna with a plurality of feeders capable of independently generating multifold resonances. Therefore, multiband transmission/reception, i.e., wideband transmission/reception, can be performed even with one antenna.
  • Fig. 1 illustrates a maximum radius of an antenna.
  • Fig. 2 illustrates a terrestrial-digital multimedia broadcasting (T-DMB) frequency bandwidth and a T-DMB channel bandwidth that are currently being used.
  • Fig. 3 shows a small helical antenna with multifold resonances and multiple feeders in accordance with an embodiment of the present invention.
  • T-DMB terrestrial-digital multimedia broadcasting
  • Fig. 4 describes a small helical antenna with multifold resonances and multiple feeders in accordance with an embodiment of the present invention.
  • Fig. 5 is a graph showing respective SlI parameters for feeders of the small helical antenna of Figs. 3 and 4.
  • Fig. 6 illustrates a small planar inverted-F antenna (PIFA) with multifold resonances and multiple feeders in accordance with an embodiment of the present invention.
  • Fig. 7 is a graph showing respective SIl parameters for feeders of the small PIFA of Fig. 6.
  • Fig. 8 illustrates a small meander-type antenna with multifold resonances and multiple feeders in accordance with an embodiment of the present invention.
  • Fig. 9 describes a small spring loop antenna with multifold resonances and multiple feeders in accordance with an embodiment of the present invention.
  • Fig. 10 illustrates the small spring loop antenna with multifold resonances and multiple feeders of Fig. 9 in accordance with another embodiment of the present invention.
  • Fig. 11 shows a small spring loop antenna with multifold resonances and multiple feeders in accordance with yet another embodiment of the present invention.
  • FIG. 3 shows a small helical antenna with multifold resonances and multiple feeders in accordance with an embodiment of the present invention, which illustrates a one-branch-point structure.
  • the small helical antenna in accordance with an embodiment of the present invention includes a conductor 301, a first feeder 303, a second feeder 305, a third feeder 307, a switch unit 309 and a circuit output unit 311.
  • the circuit output unit 311 is connected to a circuit that is generally realized in antennas, e.g., a structure connected to an RF device such as an amplifier, a mixer, an analog-to-digital (AD) converter.
  • the general circuit includes a ground plane, and can be substituted with a printed circuit board (PCB).
  • the conductor 301 is an antenna element and is configured to transmit/receive a signal to/from the outside .
  • the first feeder 303, the second feeder 305 and the third feeder 307 extend from one random branch point to the switch unit 309. A distance from the random one branch point of the conductor 301 to the switch unit 309 varies with the first feeder 303, the second feeder 305 and the third feeder 307.
  • the switch unit 309 selectively connects the circuit output unit 311 to one of the first feeder 303, the second feeder 305 and the third feeder in response to a control signal sent from the general circuit.
  • the circuit output unit 311 is connected to one of the first feeder 303, the second feeder 305 and the third feeder 307, the total length of the conductor 301, i.e., a length from a feed point to an antenna end can be varied, also varying a resonant length of the antenna to change.
  • FIG. 3 Three feeders of the first feeder 303, the second feeder 305 and the third feeder 307 are illustrated in Fig. 3. However, for example, four or five feeders may be randomly installed according to embodiments, provided that the total length of the conductor 301 can be varied upon selection of the feeder.
  • the switch unit 309 must be connected to a ground plane included in the general circuit, so that an influence of a switch and a switch control signal to a resonant frequency can be minimized.
  • the ground plane allows resonance of the antenna to occur at 1/4 wavelength, thereby contributing to reducing an antenna size.
  • one of the feeders 303, 305 and 307 may be selectively connected with the circuit output unit 311 by using one switch, or one switch may be installed for each of the feeders 303, 305 and 307 to selectively connect one of the feeders 303, 305 and 307 with the circuit output unit 311. If a switch is installed for each feeder, an electrical length change can be accurately controlled, so that a resonant frequency can be precisely controlled.
  • the switch unit 309 automatically controls the switch by using resonant frequency information of an LC switch, or local oscillation frequency information selected by an intermediate frequency converter and applied to a mixer.
  • a switching direction that maximizes a signal to noise ratio of a radio frequency (RF) signal or an intermediate frequency by a feedback operation can be selected.
  • the switch unit 309 If the switch unit 309 is connected simultaneously with a plurality of feeders, it can be considered as one antenna, and thus a bandwidth is limited by a maximum bandwidth of a small antenna. Therefore, the circuit output unit 311 in the small antenna in accordance with an embodiment of the present invention is connected to one feeder and disconnected with the rest of the feeders.
  • the circuit output unit 311 is a feed point and provides power to the conductor part 501 along the connected first feeder 303, the second feeder 305 or the third feeder 307.
  • the small antenna having a structure described above can have a small size while operating like a monopole antenna.
  • Fig. 4 is a view of a small helical antenna with multifold resonances and multiple feeders in accordance with an embodiment of the present invention, illustrating a multi-branch-point structure.
  • the small helical antenna with the multi-branch-point structure of Fig. 4 has the same structure as the small helical antenna, except for the branch point.
  • the first feeder 303, the second feeder 305 and the third feeder 307 are connected up to the switch unit 309 from respectively different random points of the conductor 301. That is, the first feeder 303, the second feeder 305 and the third feeder 307 is connected up to the switch unit 390 from different points of the conductor 301, respectively.
  • the length of the conductor 301 is the longest when the circuit output unit 311 is connected to the first feeder 303.
  • the first feeder 303 serves as a feed point implementing the longest resonant length.
  • the second feeder 305 serves as a feed point implementing the intermediate resonant length.
  • the third feeder 307 serves as a feed point implementing the shortest resonant length.
  • a resonant frequency is generated in the lowest band when the circuit output unit 311 is connected with the first feeder 303, and generated in the highest band in the case of connection with the third feeder 307.
  • the feed points are connected to respective points of the antenna element where is wound up, so that change of the total length of the antenna and manufacturing of the antenna can be facilitated.
  • Fig. 5 is a graph showing respective SIl parameters for the feeders of the small helical antenna of Fig. 3 or 4.
  • An antenna is a discontinued line and an end thereof is made to resonate at a specific frequency, so that a signal is transmitted to the outside with a specific magnetic-field energy without undergoing total reflection. That is, basically, the antenna is a one-port device having one input port.
  • the antenna has only a SIl value representing an input reflection coefficient, the SIl value (dB) is minimized at a frequency at which the antenna operates, and signal power input to the antenna is maximally radiated to the outside at the frequency at which the SIl value is the minimum. That is, the best impedance matching is achieved at the point where the SIl value is the minimum.
  • graph A represents a case where the circuit output unit 311 is connected to the first feeder 303
  • graph B represents a case where the circuit output unit 311 is connected to the second feeder 305
  • graph C represents a case where the circuit output unit 311 is connected to the third feeder 307.
  • the total length of the antenna from the feed point to the antenna end is the longest in the case of the connection with the first feeder 303, and is the shortest in the case of the connection with the second feeder 307.
  • the resonant frequency is generated in the lowest band in connection with the first feeder 303.
  • the resonant frequency is generated in the intermediate band in connection with the second feeder 305.
  • the resonant frequency is generated in the highest band in connection with the third feeder 307.
  • a resonant frequency can be varied by using the small helical antennas of Figs. 3 and 4, and thus wideband transmission/reception can be achieved.
  • Fig. 6 is a view showing a small PIFA antenna with multifold resonances and multiple feeders in accordance with an embodiment of the present invention.
  • the small PIFA antenna in accordance with this embodiment includes a conductor 601, a first feeder 603, a second feeder 605, a third feeder 607, a switch unit 609, a circuit output unit 611, and a PCB edge board (not shown) .
  • the PCB edge board includes a circuit that is generally implemented in an antenna, e.g., a structure connected to an RF device, such as an amplifier, a mixer and an AD converter, and includes a ground plate 615. In general, the ground plate 615 is placed at a rear surface of the antenna.
  • the conductor 601 is an antenna element and serves to transmit/receive a signal to/from the outside, and is installed on a dielectric substance, not the ground plate 615 at the rear surface of the antenna.
  • a PIFA antenna is realized in general by bending or branching the conductor 601, the PIFA antenna shows a narrowband characteristic. Therefore, as shown in Fig. 6, a plurality of feeders 603, 605 and 607 are installed and controlled by using the switch unit 609, so that a PIFA antenna capable of wideband transmission/reception can be implemented.
  • the first feeder 603, the second feeder 605 and the third feeder 607 connect the circuit output unit 611 with the conductor 601, and are installed such that they can vary the total length of the conductor 601.
  • the switch unit 609 serves in the same manner as the switch unit 309 of Fig. 3. Accordingly, the switch unit 609 connects the circuit output unit 611 with one of the first feeder 603, the second feeder 605 and the third feeder 607, and e.g., four or five feeders may be randomly installed in accordance with embodiments.
  • the switch unit 609 may selectively connect one of the feeders 603, 605 and 607 with the circuit output unit 611 by using one switch.
  • one switch may be installed for each of the feeders 603, 605 and 607 to selectively connect one of the feeders 303, 305 and 307 with the circuit output unit 611.
  • the switch unit 609 is connected with a ground plane included in a general circuit, and a control signal of the switch unit 609 for selection of one feeder can be controlled automatically or manually.
  • the circuit output unit 611 is a feed point and supplies power from the PCB edge board (not shown) along the connected first, second or third feeder 603, 605 or
  • the small PIFA antenna has advantages of high space utilization because of easy access of a feed point to the center of the PCB edge board (not shown) .
  • Fig. 7 is a graph showing respective SIl parameters for the feeders of the small PIFA antenna of Fig. 6.
  • graph D represents the case where the circuit output unit 611 is connected with the first feeder 603
  • graph E represents the case where the circuit output unit 611 is connected with the second feeder 605
  • graph F represents the case where the circuit output unit 611 is connected to the third feeder
  • the total length of the antenna i.e., a length from the feed point up to an antenna end is the longest in the case of the connection with the first feeder 603, and is the shortest in the case of the connection with the third feeder 607.
  • a resonant frequency is generated in the lowest band in connection with the first feeder 603 as shown in graph D, generated in the intermediate band in connection with the second feeder 605 as shown in graph E, and generated in the highest band in connection with the third feeder as shown in graph F.
  • an antenna that is used for, e.g., a wireless communication terminal, a relay or an access point (AP) can be implemented in a transmission/reception environment that includes a narrowband channel and does not use one channel while using another channel.
  • Fig. 8 shows a small meander-type antenna with multifold resonances and multiple feeders in accordance with an embodiment of the present invention.
  • the meander- type antenna refers to an antenna including a bent conductor, i.e., a bent antenna element.
  • the small meander-type antenna in accordance with this embodiment includes a conductor 801, a first feeder 803, a second feeder 805, a third feeder 807, a switch unit 809 and a circuit output unit 811.
  • the circuit output unit 811 is connected to a general circuit which is generally implemented in an antenna, e.g., a structure connected to an RF device, such as an amplifier, a mixer and an RF device) .
  • the general circuit includes a ground plane, and can be substituted with a printed circuit board (PCB) .
  • PCB printed circuit board
  • the conductor 801 is an antenna element, serves to transmit/receive a signal to/from the outside and is installed on a dielectric substance.
  • the first feeder 803, the second feeder 805 and the third feeder 807 connect the conductor 801 with the circuit output unit 811, and are installed such that the total length of the conductor 801 can vary with each of the feeders 803, 805 and 807.
  • the switch unit 809 serves in the same manner as the switch unit 309 of Fig. 3. Thus, the switch unit 809 connects the circuit output unit 811 with one of the first feeder 803, the second feeder 805 and the third feeder 807, and, e.g., four or more feeders can be randomly installed in accordance with embodiments.
  • the switch unit 809 may selectively connect one of the feeder 803, 805 and 807 with the circuit output unit 811 by using one switch.
  • one switch may be installed for each of the feeders 803, 805 and 807 to selectively connect one of the feeder 803, 805 and 807 with the circuit output unit 811.
  • the switch unit 809 is connected to a ground plane included in a general circuit, and a control signal of the switch unit 809 for selection of one feeder can be controlled automatically or manually.
  • the circuit output unit 811 is a feed point, and supplies power to the conductor 801 along the connected first, second or third feeder 803, 805 or 807.
  • the total length of the small meander-type antenna of Fig. 8 is the longest when the circuit output unit 811 is connected with the first feeder 803, and is the shortest when the circuit output unit 811 is connected with the third feeder 807.
  • a resonant frequency is generated in the lowest band in the case of the connection with the first feeder 803, generated in the intermediate band in the case of the connection with the second feeder 805, and generated in the highest band in the case of the connection with the third feeder 807.
  • Fig. 9 is a view of a small spring loop antenna with multifold resonances and multiple feeders in accordance with an embodiment of the present invention.
  • the small spring loop antenna of Fig. 9 includes a first feeder 901, a second feeder 903, a switch unit 905, a circuit output unit 907, a PCB edge board 909 and a spring conductor 911, and is installed inside an edge of a case of a portable terminal.
  • the switch unit 905 serves in the same manner as the switch unit 309 of Fig. 3.
  • the switch unit 905 connects the circuit output unit 907 with one of the first feeder 901 and the second feeder 903 in response to a control signal sent from the PCB edge board 909, which is a general circuit.
  • the first feeder 901 and the second feeder 903 connect the switch unit 905 with the outside of the spring type conductor 911. Distances from respective feed points of the feeder 901 to an end of the spring type conductor 911 are different from each other.
  • the length of the spring type conductor 911 is the longest when the circuit output unit 907 is connected with the first feeder 901, and thus a resonant frequency is generated in a low band.
  • the length of the spring type conductor 911 is the shortest when the circuit output unit 907 is connected with the second feeder 903, and thus the resonant frequency is generated in the highest band.
  • Fig. 10 is a view of a small spring loop antenna with multifold resonances and multiple feeders of Fig. 9 in accordance with another embodiment of the present invention .
  • the small spring loop antenna of Fig. 10 includes a first feeder 901, a second feeder 903, a switch unit 905, a circuit output unit 907, a PCB edge board 909, a spring conductor 911, a dielectric substance 1001 and a case connector 1003.
  • the second feeder 903 of Fig 10 is connected to a random point within the spring conductor 911 to change the total length of the antenna.
  • the spring conductor 911 is installed in the dielectric substance 1001 having elasticity and extensibility, e.g., rubber.
  • the case connector 1003 is used for connection with a case.
  • the antenna When the antenna is installed between the case connector 1003 and a terminal case, the antenna can be easily installed without changing an electrical characteristic thereof.
  • Fig. 11 is a view of a small spring loop antenna with multifold resonances and multiple feeders in accordance with yet another embodiment of the present invention, illustrating an assembly type manufacturing structure.
  • a first feeder 11-1, a second feeder 11-2, a first conductor 11-3, and a second conductor 11-4 are separately manufactured. That is, for easy manufacturing and mass production, the feeders 11-1 and 11-2 and the conductors 11-3 and 11-4 are separately manufactured and then connected together.
  • conductor screws of e.g., copper, silver, bronze, brass, or aluminum are installed at both ends of each of the feeders 11-1 and 11-2 and the conductors 11-3 and 11-4. Accordingly, a plurality of conductors or the feeders and the conductors are connected with each other.
  • the first feeder 11-1 and the second feeder 11-2 are installed, connected with a spring conducting wire within a dielectric substance, e.g., Teflon and polyvinyl chloride (PVC) , and thus connect random points of the spring conducting wire within the dielectric substance to feed points to vary the length of the conducting wire. Also, the spring conducting wire is wound up in the dielectric substance and then covered with an outer cover, thereby minimizing electric discharge caused by contact.
  • a dielectric substance e.g., Teflon and polyvinyl chloride (PVC)
  • the first feeder 11-1 includes three antenna input/output (I/O) lines, and one of those three lines is installed on a ground plane GND. Thus, the first feeder 11-1 can have two different antenna lengths.
  • the first conductor 11-3 includes only a spring conducting wire, and screws are installed at both ends of the first conductor 11-3, so that it can be used in connection with a feeder or a plurality of other conductors.
  • the second conductor 11-4 includes a dielectric substance and a spring conducting line wound inside the dielectric substance, and screws are installed at both ends thereof, so that it can be used in connection with a feeder or a plurality of other conductors. Also, the spring conducting wire is wound up in the dielectric substance and covered with an outer cover, thereby minimizing electric discharge caused by contact.
  • the small antenna using a plurality of feeders illustrated in Figs. 3 to 11 in accordance with embodiments of the present invention is applicable to an inverted-F antenna such as a planar inverted-F antenna (PIFA), a meander-type antenna, a helical antenna and a spring loop antenna.
  • the small antenna in accordance with embodiments of the present invention is also applicable to a small antenna of 1/4 wavelength or less, such as a spiral top loaded monopole antenna (STLA) , a capacitor-plate antenna, and a multi-element top-loaded monopole antenna.
  • STLA spiral top loaded monopole antenna
  • the technology of the present invention can be realized as a program and stored in a computer-readable recording medium, such as CD-ROM, RAM, ROM, floppy disk, hard disk and magneto-optical disk. Since the process can be easily implemented by those skilled in the art of the present invention, further description will not be provided herein.
  • a small antenna with multifold resonances and multiple feeders capable of multiband transmission/reception, i.e., wideband transmission/reception can be implemented.

Landscapes

  • Details Of Aerials (AREA)

Abstract

L'invention concerne une petite antenne à résonances multiples et lignes d'alimentation multiples. L'antenne comprend un élément d'antenne; une pluralité de lignes d'alimentation destinées à alimenter en électricité l'élément d'antenne; et un interrupteur d'alimentation permettant de relier sélectivement une des lignes d'alimentation à l'élément d'antenne pour alimenter en électricité l'élément d'antenne, les lignes d'alimentation étant disposées de manière à faire varier une longueur totale de l'élément d'antenne.
PCT/KR2007/005301 2006-10-26 2007-10-26 Petite antenne à résonances multiples et lignes d'alimentation multiples WO2008051043A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07833610.4A EP2087552A4 (fr) 2006-10-26 2007-10-26 Petite antenne à résonances multiples et lignes d'alimentation multiples

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20060104643 2006-10-26
KR10-2006-0104643 2006-10-26
KR10-2007-0107739 2007-10-25
KR1020070107739A KR100954378B1 (ko) 2006-10-26 2007-10-25 다중 급전 다중 공진 소형 안테나

Publications (1)

Publication Number Publication Date
WO2008051043A1 true WO2008051043A1 (fr) 2008-05-02

Family

ID=39646860

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2007/005301 WO2008051043A1 (fr) 2006-10-26 2007-10-26 Petite antenne à résonances multiples et lignes d'alimentation multiples

Country Status (3)

Country Link
EP (1) EP2087552A4 (fr)
KR (1) KR100954378B1 (fr)
WO (1) WO2008051043A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104283006A (zh) * 2013-07-02 2015-01-14 叶明豪 多天线馈入端口有源天线系统及其相关控制方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6069587A (en) * 1998-05-15 2000-05-30 Hughes Electronics Corporation Multiband millimeterwave reconfigurable antenna using RF mem switches
JP2005005780A (ja) * 2003-06-09 2005-01-06 Hoko Denshi Kk 多周波変形ｔ型アンテナ、および、その構成方法
US20050162328A1 (en) * 2004-01-23 2005-07-28 Sony Corporation Antenna apparatus
US7050018B2 (en) * 2004-09-07 2006-05-23 Machine Applications Corp. Multi-band antenna system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3098430B2 (ja) * 1996-08-30 2000-10-16 埼玉日本電気株式会社 携帯無線機用ヘリカルアンテナ
JPH11163620A (ja) * 1997-11-27 1999-06-18 Sharp Corp 周波数切替式アンテナ
WO2001029927A1 (fr) * 1999-10-15 2001-04-26 Siemens Aktiengesellschaft Antenne commutable
KR100652667B1 (ko) * 2004-09-07 2006-12-06 엘지전자 주식회사 이동 통신 단말기의 내장형 안테나 제어 장치 및 그 제어방법
US7663555B2 (en) * 2004-10-15 2010-02-16 Sky Cross Inc. Method and apparatus for adaptively controlling antenna parameters to enhance efficiency and maintain antenna size compactness

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6069587A (en) * 1998-05-15 2000-05-30 Hughes Electronics Corporation Multiband millimeterwave reconfigurable antenna using RF mem switches
JP2005005780A (ja) * 2003-06-09 2005-01-06 Hoko Denshi Kk 多周波変形ｔ型アンテナ、および、その構成方法
US20050162328A1 (en) * 2004-01-23 2005-07-28 Sony Corporation Antenna apparatus
US7050018B2 (en) * 2004-09-07 2006-05-23 Machine Applications Corp. Multi-band antenna system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2087552A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104283006A (zh) * 2013-07-02 2015-01-14 叶明豪 多天线馈入端口有源天线系统及其相关控制方法

Also Published As

Publication number Publication date
EP2087552A4 (fr) 2013-11-06
EP2087552A1 (fr) 2009-08-12
KR100954378B1 (ko) 2010-04-26
KR20080038032A (ko) 2008-05-02

Similar Documents

Publication Publication Date Title
US8618993B2 (en) Loop antenna
JP4523211B2 (ja) 無線通信機のための折りたたみデュアル周波数バンドアンテナ
US7605766B2 (en) Multi-band antenna device for radio communication terminal and radio communication terminal comprising the multi-band antenna device
US9502770B2 (en) Compact multiple-band antenna for wireless devices
US6380903B1 (en) Antenna systems including internal planar inverted-F antennas coupled with retractable antennas and wireless communicators incorporating same
US6204826B1 (en) Flat dual frequency band antennas for wireless communicators
JP3835128B2 (ja) アンテナ装置
CN1747232B (zh) 多波束天线
US6218992B1 (en) Compact, broadband inverted-F antennas with conductive elements and wireless communicators incorporating same
US6229487B1 (en) Inverted-F antennas having non-linear conductive elements and wireless communicators incorporating the same
US20060232493A1 (en) Circular-polarization dipole helical antenna
US20110057857A1 (en) Antenna device and portable radio apparatus
US6563466B2 (en) Multi-frequency band inverted-F antennas with coupled branches and wireless communicators incorporating same
US9419340B2 (en) Ultra wide band antenna
US8665169B2 (en) Monopole antenna
US9484628B2 (en) Multiband frequency antenna
US20020123312A1 (en) Antenna systems including internal planar inverted-F Antenna coupled with external radiating element and wireless communicators incorporating same
JP4875171B2 (ja) 多重帯域アンテナ
KR100899293B1 (ko) 이중공진에 의한 광대역 안테나
WO2009022767A1 (fr) Antenne intégrée sur une carte de circuit imprimé
EP1733456A1 (fr) Antenne multibande comprenant un fouet dote d'une alimentation en energie independante dans un terminal de telecommunications sans fil
WO2008051043A1 (fr) Petite antenne à résonances multiples et lignes d'alimentation multiples
KR100826402B1 (ko) 광대역 안테나
KR101171740B1 (ko) 접지 일체형 내장형 안테나
KR20090106782A (ko) 휴대 단말기용 광대역 헬리컬 안테나

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07833610

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2007833610

Country of ref document: EP