EP0632525A1 - In einem Horn integrierter Wandler für linear in zirkular polarisierte Wellen - Google Patents

In einem Horn integrierter Wandler für linear in zirkular polarisierte Wellen Download PDF

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Publication number
EP0632525A1
EP0632525A1 EP93121070A EP93121070A EP0632525A1 EP 0632525 A1 EP0632525 A1 EP 0632525A1 EP 93121070 A EP93121070 A EP 93121070A EP 93121070 A EP93121070 A EP 93121070A EP 0632525 A1 EP0632525 A1 EP 0632525A1
Authority
EP
European Patent Office
Prior art keywords
polarized wave
horn
rectangular waveguide
conical horn
circular
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
EP93121070A
Other languages
English (en)
French (fr)
Inventor
Mituzi C/O Warabi Fact. Nippon Antenna Enomoto
Kazumi C/O Warabi Fact. Nippon Antenna Tatuzuki
Isao C/O Warabi Fact. Nippon Antenna Akimoto
Zyunya C/O Warabi Fact. Nippon Antenna Itani
Yasutomo C/O Warabi Fact. Nippon Antenna Konisi
Motoki C/O Warabi Fact. Nippon Antenna Ohsima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Antenna Co Ltd
Original Assignee
Nippon Antenna Co Ltd
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 Nippon Antenna Co Ltd filed Critical Nippon Antenna Co Ltd
Publication of EP0632525A1 publication Critical patent/EP0632525A1/de
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/24—Polarising devices; Polarisation filters 
    • H01Q15/242—Polarisation converters
    • H01Q15/244—Polarisation converters converting a linear polarised wave into a circular polarised wave
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/165—Auxiliary devices for rotating the plane of polarisation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/165—Auxiliary devices for rotating the plane of polarisation
    • H01P1/17—Auxiliary devices for rotating the plane of polarisation for producing a continuously rotating polarisation, e.g. circular polarisation
    • H01P1/172—Auxiliary devices for rotating the plane of polarisation for producing a continuously rotating polarisation, e.g. circular polarisation using a dielectric element

Definitions

  • the present invention relates to a circular-to-linear polarized wave transducer for transducing a circularly-polarized wave into a linearly-polarized wave, and particularly to a polarized-wave transducer applied suitably to the primary horn of a BS antenna.
  • Broadcasts based on a broadcasting satellite (BS) and communication satellite (CS) are prevailing recently.
  • the BS-based broadcast is transmitted from the satellite in the form of a radio wave that is circularly-polarized, and therefore it is necessary for the primary horn of the receiving BS antenna to be equipped with a transducer which transduces the circularly-polarized wave into a linearly-polarized wave.
  • Fig. 13 shows an example of the BS antenna.
  • reference numeral 10 ⁇ 0 ⁇ denotes a paraboloid reflector which reflects the radio wave that is circularly polarized. Disposed at the focal point of the paraboloid reflector 10 ⁇ 0 ⁇ is a primary horn 10 ⁇ 1, by which the radio wave focused by the paraboloid reflector 10 ⁇ 0 ⁇ is taken in.
  • the primary horn 10 ⁇ 1 is generally made up of a conical horn for receiving a circularly-polarized wave, a circular-to-linear polarized wave transducer for transducing the circularly-polarized wave received by the conical horn into a linearly-polarized wave, a rectangular waveguide connected to the transducer, a probe inserted in the rectangular waveguide, and a frequency transducer for transducing the BS signal received by the probe into an intermediate frequency signal.
  • the primary horn 10 ⁇ 1 is disposed at the focal point of the paraboloid reflector 10 ⁇ 0 ⁇ by being supported by a stay 10 ⁇ 2, and the complete BS antenna is installed on the balcony, roof or the like of a building by being supported swingably by a mast 10 ⁇ 3.
  • Fig. 14 shows an example of the conventional primary horn used for the BS antenna.
  • the circularly-polarized BS signal received by the conical horn 111 is propagated in the conical horn 111 and entered to a circular-to-linear polarized wave transducer 112.
  • the transducer 112 incorporates a phase shift plate of dielectric material disposed at a 45°-inclination for example, by which the circularly-polarized wave is transduced into a linearly-polarized wave.
  • the resulting linearly-polarized wave is propagated in the rectangular waveguide formed in a housing 113 through flanges 116 and 117, and the BS signal is transduced into an intermediate frequency (IF) signal by a frequency transducer incorporated in the housing 113.
  • the resulting IF signal is delivered to an external BS tuner through a connector 114.
  • the conventional primary horn needs to be as long as the sum of the dimensions of the conical horn, circular-to-linear polarized wave transducer and rectangular waveguide, and the difficulty of making a short primary horn has been a problem against a compact and light-weight design.
  • an object of this invention is to accomplish a compact and light-weight design of the primary horn.
  • Another object of this invention is to accomplish a compact and light-weight design of the primary horn without incurring the deterioration of performance.
  • a further object of this invention is to accomplish the integration of the conical horn and circular-to-linear polarized wave transducer without adversely affecting the test of the frequency transducer.
  • a circular-to-linear polarized wave transducer integrated with a horn comprising: a probe (53) for feeding an input to an RF circuit board on which a frequency transducer circuit is arranged; a rectangular waveguide (12) in which said probe (53) is inserted through the wall of waveguide; a conical horn (11), with the feed-end thereof being connected to the output-end of said rectangular waveguide (12); and a passive element (33) having an electric length equal to about a half wavelength and disposed in said conical horn (11) by being spaced out by a prescribed distance from the feed-end of said conical horn (11) and inclined by about 45°; said passive element (33) constituting a circular-to-linear polarized wave transducer, and said conical horn (11) and said rectangular waveguide (12) being formed as a unitary member.
  • a circular-to-linear polarized wave transducer integrated with a horn comprising: a probe (53) for feeding an input to an RF circuit board (54) on which a frequency transducer circuit is arranged; a rectangular waveguide (12) in which said probe (53) is inserted through the wall of waveguide; a conical horn (11), with the feed-end thereof being connected to the output-end of said rectangular waveguide (12); a short-circuit plate (12) disposed at the output-end of said rectangular waveguide (12) and having a slit (21) which transmits only a linearly-polarized wave; and a passive element (33) having an electric length equal to about a half wavelength and disposed in said conical horn (11) by being spaced out by a prescribed distance from said short-circuit plate (2) and inclined by about 45° with respect to said slit (21); said passive element (33) constituting a circular-to-linear polarized wave transducer, and said conical horn (11) and
  • the circular-to-linear polarized wave transducer is located inside the conical horn, and the total length of the primary horn can be reduced.
  • the resulting compact and light-weight structure contributes to the cost reduction of the primary horn.
  • the short-circuit plate with the formation of a slit allows the propagation of only the linearly-polarized wave, improving the performance of cross polarization discrimination, and also allows the impedance matching for the connection between the conical horn and rectangular waveguide, minimizing the propagation loss. On this account, a compact and light-weight design of the primary horn does not deteriorate the performance.
  • the frequency transducer can be tested by coupling the rectangular waveguide to the conical horn, with the short-circuit plate and passive element being detached, and this enables the integration of the conical horn and circular-to-linear polarized wave transducer.
  • Fig.1 shows by development a conical horn and part of a rectangular waveguide which constitute the primary horn of this invention.
  • reference numeral 1 denotes the primary horn.
  • a diecast case 13 and an RF chassis 14 form a housing.
  • the diecast case 13 includes an integral formation of a conical horn 11 and a rectangular waveguide 12.
  • Indicated by 18 is a horn mount bar, which has another end secured to a stay fixed to a paraboloid reflector (not shown) so that the primary horn is located at the focal point of the paraboloid reflector.
  • the diecast case 13 has a groove 16, which is designed to engage with a ridge formed on the interior surface of a lid 4 that serves to prevent raindrops and dusts from entering into the conical horn 11.
  • the circularly-polarized wave focused by the paraboloid reflector and received by the conical horn 11 is transduced into a linearly-polarized wave and then propagated in the rectangular waveguide 12.
  • the linearly-polarized wave is received by a probe (not shown) disposed in the waveguide 12, fed to an RF circuit board (not shown) accommodated in the RF chassis 14, and transduced into an intermediate frequency (IF) signal which is led out through a connector 19.
  • IF intermediate frequency
  • the short-circuit plate 2 is fixed by being glued for example on the attachment wall surface between the conical horn 11 and rectangular waveguide 12.
  • the short-circuit plate 2 has the formation of a slit 21 in its central section, by which only a linearly-polarized wave is selectively conducted to the rectangular waveguide 12, and it also functions to take impedance matching between the conical horn 11 and rectangular waveguide 12 through the adjustment of the dimension of the slit 21.
  • the cuts 22 formed around the short-circuit plate 2 are brought to engage with the bosses 17 formed on the attachment wall surface between the conical horn 11 and rectangular waveguide 12 so that the short-circuit plate 2 is fixed, with its slit 21 having a prescribed angle with respect to the rectangular waveguide 12 (parallel to the attachment wall surface).
  • the bucket-shaped supporting device 3 After the short-circuit plate 2 has been fixed on the attachment wall surface, the bucket-shaped supporting device 3 is mounted on it.
  • the bucket-shaped supporting device 3 has a bottom plate 32, on which a passive element 33 is fixed at about 45° with respect to the slit 21.
  • the supporting device 3 has a plurality of legs 31 extending from the bottom plate 32. Each leg has an electric length set equal to about a quarter wavelength so that the distance between the passive element 33 and short-circuit plate 2 is set to an electric length of about a quarter wavelength. The legs 31 also serve to keep the short-circuit plate 2 in press-contact with the attachment wall surface.
  • the bucket-shaped supporting device 3, which is disposed inside the conical horn 11, is preferably made of an insulation material having a small dielectric constant so that the electromagnetic field distribution in the conical horn 11 is not disturbed.
  • the bucket-shaped supporting device 3 has the formation of cuts 34 around the rim of its open end, and these cuts 34 are designed to engage with the bosses 15 formed on the rim of the radial port of the the conical horn 11 so that the passive element 33 is positined at about 45° with respect to the slit 21.
  • the lid 4 is placed over the radial port of the conical horn 11 with the intention of preventing raindrops and dusts from entering into the conical horn 11.
  • the lid 4 has a ridge formed on its interior surface, and it is designed to engage with the groove 16 formed in the exterior surface near the radial port of the conical horn 11 thereby to fix the lid 4.
  • the passive element 33 is disposed inside the conical horn 11 and the output-end of the rectangular waveguide 12 is terminated by the short-circuit plate 2 having the slit 21. Consequently, the total length from the conical horn 11 to the terminal of the rectangular waveguide 12 can be reduced, and a circularly-polarized wave can be transduced into a linearly-polarized wave efficiently.
  • Fig.2 shows the cross section of the primary horn arranged as described above.
  • the diecast case 13 has the formation of the conical horn 11 and rectangular waveguide 12.
  • the RF chassis 14 is screwed to the diecast case 13, and it covers the rear end of the rectangular waveguide 12 and the back of the diecast case 13.
  • a probe 53 is inserted in the rectangular waveguide 12, and it has another end connected to the RF circuit board 54.
  • the RF circuit board 54 includes a frequency transducer circuit, by which the signal transduced to have the intermediate frequency is produced, and it is led out through the connector 19.
  • the housing which is made up of the diecast case 13 and RF chassis 14 is covered by a front cover 52 and a rear cover 51.
  • the lid 4 which covers the front of the conical horn 11 has a double wall structure including an upper cap 41 and lower cap 42.
  • the upper and lower caps are spaced out by a distance set equal to about a quarter wavelength so that the wave reflected by the lower cap 42 is cancelled by the wave coming in through the upper cap 41.
  • the bucket-shaped supporting device 3 is disposed inside the conical horn 11, and the passive element 33 is fixed on the bottom of the device 3.
  • the short-circuit plate 2 is disposed by being spaced out by about a quarter wavelength from the passive element 33.
  • the short-circuit plate 2 is kept in press-contact with the attachment wall surface 55 by means of the legs 31 extending from the bottom of the bucket-shaped supporting device 3.
  • Fig.3 shows by development the cross section of the section of the conical horn 11.
  • the RF chassis 14 is attached to the back of the diecast case 13, with a recess formed in the RF chassis 14 being coupled with the rear end of the rectangular waveguide 12 which is open-ended at the time of assembling, thereby to terminate the waveguide 12.
  • the probe 53 which is connected to the RF circuit board 54 is held between the diecast case 13 and RF circuit board 54.
  • the short-circuit plate 2 is fixed by being glued for example, and the bucket-shaped supporting device 3, with the passive element 33 being fixed at its bottom, is inserted in the conical horn 11.
  • the bucket-shaped supporting device 3 has the formation of cuts around its open-end section, and these cuts engage with the bosses 15 formed on the radial port of the conical horn 11.
  • Fig.4(a)(b) shows the cross section of the assembly of these components.
  • Fig.4(a) is a front view of the assembly, in which the bosses 15 formed on the rim of the radial port of the conical horn 11 engage with the cuts formed in the open-end section of the bucket-shaped supporting device 3.
  • Fig.4(b) is a side cross-sectional view of the assembly, in which the probe 53 is held between the diecast case 13 and RF chassis 14 and the recess, which forms part of the rectangular waveguide 12, formed in the RF chassis 14 has a depth set equal to about a quarter wavelength and functions to terminate the rectangular waveguide 12.
  • Figs.5 and 6 show the cross section of the radial port and lid 4 of the conical horn 11.
  • the ridge 43 formed on the interior surface of the lid 4 is designed to engage with the groove 16 formed in the exterior surface of the conical horn 11 near the radial port so that the lid 4 is firmly coupled with the diecast case 13.
  • the lid 4 has its lower cap 42 located inside the upper cap 41.
  • the lid 4 is attached to the radial port of the conical horn 11 so as to cover the front end of the horn 11 as shown in Fig.6.
  • the figure shows the tight coupling of the ridge 43 of the lid 4 with the groove 16 of the diecast case 13.
  • Fig.7(a)(b)(c) and Fig.8 are front cross-sectional views of the horn assembly taken along the lines shown in Fig.4(a)(b).
  • Fig. 7(a) is a cross-sectional view of the horn section taken outwardly along the line D-D', showing the disposition of the bucket-shaped supporting device 3 fitted in contact with the inner surface of the conical horn 11 which is formed as part of the diecast case 13.
  • Fig.7(b) is a cross-sectional view of the horn section taken inwardly along the line C-C' on the front surface of the short-circuit plate 2, showing the disposition of the short-circuit plate 2 in the conical horn 11.
  • the disc-shaped short-circuit plate 2 has the slit 21 extending horizontally and the cuts 22 formed at the circumuference of the plate.
  • Fig.7(c) is a cross-sectional view of the horn section taken outwardly along the line B-B' on the back surface of the short-circuit plate 2, showing the disposition of the passive element 33 at about 45° with respect to the horizontal direction on the bottom of the bucket-shaped supporting device 3.
  • the passive element 33 is caulked on the bottom of the supporting device 3.
  • Indicated by 35 is an air hole, through which air communicate to equalize the air pressure between the rooms at the front and back of the bucket-shaped supporting device 3.
  • Shown in the right-hand section of Fig.7(c) is a magnified view of only the passive element 33, and it has a length set equal to about ⁇ g/2 (where ⁇ g is the wavelength in the waveguide).
  • Fig.8(a) is a cross-sectional view of the horn section taken outwardly along the line A-A' on the back surface of the RF circuit board 54 which is inserted in the rectangular waveguide 12, showing the probe 53 at the end of the circuit board confronting the slit 21.
  • Fig.8(b) is a cross-sectional view of the horn section taken inwardly along the line E-E' on the back surface of the short-circuit plate 2, showing the formation of four bosses 17 on the attachment wall surface 55 where the short-circuit plate 2 is fixed. These bosses 17 are designed to engage with four cuts 22 formed in the short-circuit plate 2.
  • the diagram also shows the rectangular waveguide 12 in connection with the attachment wall surface 55.
  • the passive element 33 is disposed by being inclined by about 45° with respect to the slit 21 of the short-circuit plate 2 as shown by Fig.9(a), and spaced out by about ⁇ /4 from the short-circuit plate 2, as shown by Fig.9(b).
  • the passive element 33 is excited by a linearly-polarized wave Es radiated from the slit 21, causing the element to generate an electric field Ed in its longitudinal direction.
  • this invention is designed to adjust the length of the passive element 33 and its distance and inclination angle with respect to the slit 21 so that the vertical component Ev and horizontal component Eh have an equal amplitude and a phase difference of 90 ⁇ ° thereby to produce a circularly-polarized wave.
  • This linear-to-circular polarized wave transducer is reversible, and therefore by exciting the passive element 33 by a circularly-polarized wave, it functions to transduce the circularly-polarized wave into a linearly-polarized wave. Accordingly, it is used as a circular-to-linear polarized wave transducer by placing the passive element 33 inside the conical horn 11.
  • the passive element 33 is attached to the bottom of the bucket-shaped supporting device 3 by means of a double-side bonding tape or the like as shown by Fig.10 ⁇ (a).
  • the supporting device 3 is set on a caulking stage placed under a pressing tool as shown by Fig.10 ⁇ (b).
  • the pressing tool is lowered so that the passive element 33 is caulked on the bottom of the supporting device 3 as shown by Fig.11(a).
  • the pressing tool is raised and the supporting device 3, with the passive element 33 being attached to its bottom as shown by Fig.11(b), is taken out of the tool.
  • the bucket-shaped supporting device 3 is formed of synthetic resin such as polypropylene.
  • the RF circuit board including the frequency transducer circuit is mounted in the diecast case 13 and the RF chassis 14 is attached on it as shown by Fig.12(a).
  • An adapter for linearly-polarized wave 60 ⁇ which is formed of a rectangular waveguide 61, with its end being tapered to couple with the conical horn 11, is prepared.
  • the adapter 60 ⁇ is coupled with the the conical horn 11 as shown by Fig.12(b).
  • the adapter 60 ⁇ has the formation of cuts 62 on its end surface, and they couple with the bosses 17 formed on the attachment wall surface so that the rectangular waveguide 61 is connected by being indexed to the rectangular waveguide 12.
  • a BS signal of a linearly-polarized wave in the 12 GHz band is supplied from the adapter 60 ⁇ to the rectangular waveguide 12, and the signal is applied through the probe 53 to the frequency transducer circuit to test its characteristics.
  • the distance between the conical horn and rectangular waveguide can be reduced, and consequently a compact and light-weight primary horn can be realized.
  • the performance of the primary horn is not deteriorated by the compact, light-weight design.
  • the conical horn and rectangular waveguide can be integrated with the diecast case which accommodates the frequency transducer and they can be assembled by automatic indexing through the provision of the fitting structure, whereby the fabricating process of the primary horn can be simplified and the manufacturing cost can be reduced significantly.
  • the frequency transducer circuit can be tested while being kept attached to the primary horn.
EP93121070A 1993-06-30 1993-12-29 In einem Horn integrierter Wandler für linear in zirkular polarisierte Wellen Ceased EP0632525A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5183268A JP2759900B2 (ja) 1993-06-30 1993-06-30 ホーン一体型円偏波・直線偏波変換器
JP183268/93 1993-06-30

Publications (1)

Publication Number Publication Date
EP0632525A1 true EP0632525A1 (de) 1995-01-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP93121070A Ceased EP0632525A1 (de) 1993-06-30 1993-12-29 In einem Horn integrierter Wandler für linear in zirkular polarisierte Wellen

Country Status (4)

Country Link
EP (1) EP0632525A1 (de)
JP (1) JP2759900B2 (de)
KR (1) KR0143376B1 (de)
TW (1) TW243560B (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0899812A2 (de) * 1997-08-27 1999-03-03 Alps Electric Co., Ltd. BS-Umsetzer
US20120026937A1 (en) * 2010-07-30 2012-02-02 Spatial Digital Systems Accessing lp transponders with cp terminals via wavefront multiplexing techniques
WO2014116420A1 (en) * 2013-01-22 2014-07-31 Tyco Electronics Corporation Contactless connector
US9019033B2 (en) 2011-12-23 2015-04-28 Tyco Electronics Corporation Contactless connector
EP2624359A4 (de) * 2010-09-29 2015-05-06 Nec Corp Kommunikationsgerät
US10116409B2 (en) 2010-07-30 2018-10-30 Spatial Digital Systems, Inc. Polarization diversity with portable devices via wavefront muxing techniques

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3784715B2 (ja) 2001-12-26 2006-06-14 シャープ株式会社 フィードホーン構造、その製造方法、コンバータおよび衛星通信受信用アンテナ
JP4862530B2 (ja) * 2006-07-25 2012-01-25 日本電気株式会社 導波管
KR100894108B1 (ko) * 2008-09-26 2009-04-20 박상인 반사 기능을 구비한 안테나

Citations (2)

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Publication number Priority date Publication date Assignee Title
EP0518615A2 (de) * 1991-06-14 1992-12-16 Sony Corporation Übergangsvorrichtung von einem Hohlleiter auf eine Mikrostreifenleitung
JPH0583006A (ja) * 1991-09-24 1993-04-02 Fujitsu General Ltd 左旋及び右旋円偏波共用一次放射器

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JPS6027202A (ja) * 1983-07-25 1985-02-12 Maspro Denkoh Corp パラボラアンテナ
JPS6427301A (en) * 1987-07-23 1989-01-30 Matsushita Electric Ind Co Ltd High frequency polarizer
JPH04207601A (ja) * 1990-11-30 1992-07-29 Dx Antenna Co Ltd 円―直線偏波変換器
JPH04245802A (ja) * 1991-01-31 1992-09-02 Fujitsu General Ltd 円偏波／直線偏波変換器

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0518615A2 (de) * 1991-06-14 1992-12-16 Sony Corporation Übergangsvorrichtung von einem Hohlleiter auf eine Mikrostreifenleitung
JPH0583006A (ja) * 1991-09-24 1993-04-02 Fujitsu General Ltd 左旋及び右旋円偏波共用一次放射器

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
J.B. RANKIN ET AL.: "Multifunction single-package antenna system for spin-stabilized near-synchronous satellite", IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, vol. 17, no. 4, July 1969 (1969-07-01), NEW YORK US, pages 435 - 442 *
PATENT ABSTRACTS OF JAPAN vol. 17, no. 418 (E - 1408) 4 August 1993 (1993-08-04) *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0899812A2 (de) * 1997-08-27 1999-03-03 Alps Electric Co., Ltd. BS-Umsetzer
EP0899812A3 (de) * 1997-08-27 1999-05-12 Alps Electric Co., Ltd. BS-Umsetzer
US20120026937A1 (en) * 2010-07-30 2012-02-02 Spatial Digital Systems Accessing lp transponders with cp terminals via wavefront multiplexing techniques
US8538326B2 (en) * 2010-07-30 2013-09-17 Donald C. D. Chang Accessing LP transponders with CP terminals via wavefront multiplexing techniques
US9559416B2 (en) 2010-07-30 2017-01-31 Spatial Digital Systems, Inc. Accessing LP transponders with CP terminals via wavefront multiplexing techniques
US10116409B2 (en) 2010-07-30 2018-10-30 Spatial Digital Systems, Inc. Polarization diversity with portable devices via wavefront muxing techniques
EP2624359A4 (de) * 2010-09-29 2015-05-06 Nec Corp Kommunikationsgerät
US9166278B2 (en) 2010-09-29 2015-10-20 Nec Corporation Communication apparatus
US9019033B2 (en) 2011-12-23 2015-04-28 Tyco Electronics Corporation Contactless connector
WO2014116420A1 (en) * 2013-01-22 2014-07-31 Tyco Electronics Corporation Contactless connector
CN105210304A (zh) * 2013-01-22 2015-12-30 泰科电子公司 非接触式连接器
CN105210304B (zh) * 2013-01-22 2017-09-12 泰科电子公司 非接触式连接器

Also Published As

Publication number Publication date
JP2759900B2 (ja) 1998-05-28
TW243560B (de) 1995-03-21
JPH0722804A (ja) 1995-01-24
KR950002105A (ko) 1995-01-04
KR0143376B1 (ko) 1998-08-01

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