EP0082898A1 - Bagues collectrices HF - Google Patents

Bagues collectrices HF Download PDF

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Publication number
EP0082898A1
EP0082898A1 EP81306175A EP81306175A EP0082898A1 EP 0082898 A1 EP0082898 A1 EP 0082898A1 EP 81306175 A EP81306175 A EP 81306175A EP 81306175 A EP81306175 A EP 81306175A EP 0082898 A1 EP0082898 A1 EP 0082898A1
Authority
EP
European Patent Office
Prior art keywords
slip ring
output
divided
branches
input
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.)
Withdrawn
Application number
EP81306175A
Other languages
German (de)
English (en)
Inventor
Ernest Henry Birch
H. Labato
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.)
IDM Electronics Ltd
Original Assignee
IDM Electronics 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
Priority to GB8040199A priority Critical patent/GB2090074A/en
Application filed by IDM Electronics Ltd filed Critical IDM Electronics Ltd
Priority to EP81306175A priority patent/EP0082898A1/fr
Publication of EP0082898A1 publication Critical patent/EP0082898A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/06—Movable joints, e.g. rotating joints
    • H01P1/062—Movable joints, e.g. rotating joints the relative movement being a rotation
    • H01P1/066—Movable joints, e.g. rotating joints the relative movement being a rotation with an unlimited angle of rotation
    • H01P1/068—Movable joints, e.g. rotating joints the relative movement being a rotation with an unlimited angle of rotation the energy being transmitted in at least one ring-shaped transmission line located around the axis of rotation, e.g. "around the mast" rotary joint

Definitions

  • This invention relates to HF Slip Rings and to a method and means for improving the waveform of output signals from the slip ring.
  • An object of the present invention is to improve the waveform of output signals from the slip ring by reducing the destructive effect of stub lines on the signal transmission.
  • a further object of the present invention is to improve the frequency bandwidth of the slip ring without correspondingly increasing the slip ring diameter.
  • the stub length is a maximum and where the stub length is greater that a considerable loss occurs between the amplitude of . the input signal and that of the output signal and a still further object of the invention is to-obtain more constancy between the amplitude of the input signal and that of the output signal of the slip ring, particularly at those frequencies where virtual cutoff of the signal occurs when the combination of stubs is particularly destructive to signal transmission.
  • a high frequency slip ring assembly having a single input and a single output, characterised in that the normally destructive effect on the amplitude of the input signal on the single input by the effect of stubs is reduced by dividing the input signal path at the brush-slip ring interface into a number of paths followed by recombination of the divided signal paths from the interface to produce an output signal on said single output having an amplitude corresponding substantially to the amplitude of the input signal.
  • each parallel branch is indicated as ⁇
  • the characteristic impedance being indicated at Zo
  • the slip ring impedance through each parallel stub as Z SR , for a single input displaced 180° from the output.
  • Figure 2 the input and output are in phase given open circuit stub lengths of ⁇ as shown.
  • Figure 1 and 2 thus illustrate the two extremes in an RF slip ring during rotation.
  • the brush-slip ring interface is shown dotted in Figure 3 and at the output side, each of the two sub-branches of impedance Z SR are recombined to form two branches of impedance 2Zo and combined again to give a single output of impedance Zo.
  • the stub length of each sub-branch is shown as ⁇ i.e. half the stub length of that shown in Figure 1.
  • the input characteristic impedance Zo is divided into two branches each of impedance 2Zo and sub-divided to give the slip ring impedance ZSR for each stub line.
  • the stub line impedances ZSR are recombined into two branches each of impedance 2Zo and combined again to give an output of impedance Zo.
  • the diagram shown in Figure 4 is for the worst position during rotation where the input and output are in phase.
  • the open circuit stub length of each of the sub-branches of Figure 4 is indicated as ⁇ ; again half the stub 4 length of that shown for Figure 2.
  • the inputs should be matched to the line and must also be symmetrical to produce inputs of equal magnitude and phase.
  • the maximum number of-inputs for the system of the present invention is four, since it is impractical to produce a line impedance of >4Zo.
  • a typical RF slip ring assembly is shown in Figure 5 and comprises a slip ring housing 1, and high frequency slip ring 2.
  • a single input conductor 3 is divided into two branches 4, 5, and each branch is sub-divided into two further branches 6, 7, 8, 9 at the brush-slip ring interface X, the sub-branches being recombined at Y to form two output branches 10, 11, combined to form a single output 12.

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  • Amplitude Modulation (AREA)
  • Logic Circuits (AREA)
EP81306175A 1980-12-16 1981-12-30 Bagues collectrices HF Withdrawn EP0082898A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB8040199A GB2090074A (en) 1980-12-16 1980-12-16 Improvements in and relating to hf slip rings
EP81306175A EP0082898A1 (fr) 1980-12-16 1981-12-30 Bagues collectrices HF

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8040199A GB2090074A (en) 1980-12-16 1980-12-16 Improvements in and relating to hf slip rings
EP81306175A EP0082898A1 (fr) 1980-12-16 1981-12-30 Bagues collectrices HF

Publications (1)

Publication Number Publication Date
EP0082898A1 true EP0082898A1 (fr) 1983-07-06

Family

ID=26082722

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81306175A Withdrawn EP0082898A1 (fr) 1980-12-16 1981-12-30 Bagues collectrices HF

Country Status (2)

Country Link
EP (1) EP0082898A1 (fr)
GB (1) GB2090074A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988004835A1 (fr) * 1986-12-23 1988-06-30 Hughes Aircraft Company Joint rotatif creux sans contact

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127579A (en) * 1962-08-07 1964-03-31 Bell Telephone Labor Inc Rotary joint using circumferentially uniform field to couple rotor to stator
US3143717A (en) * 1962-04-19 1964-08-04 Pacific Scientific Co Ring and brush rotary electric coupling
US3199055A (en) * 1963-10-30 1965-08-03 Cutler Hammer Inc Microwave rotary joint
EP0019510A1 (fr) * 1979-05-11 1980-11-26 Thomson-Csf Joint tournant multivoies pour équipement de détection électromagnétique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3143717A (en) * 1962-04-19 1964-08-04 Pacific Scientific Co Ring and brush rotary electric coupling
US3127579A (en) * 1962-08-07 1964-03-31 Bell Telephone Labor Inc Rotary joint using circumferentially uniform field to couple rotor to stator
US3199055A (en) * 1963-10-30 1965-08-03 Cutler Hammer Inc Microwave rotary joint
EP0019510A1 (fr) * 1979-05-11 1980-11-26 Thomson-Csf Joint tournant multivoies pour équipement de détection électromagnétique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988004835A1 (fr) * 1986-12-23 1988-06-30 Hughes Aircraft Company Joint rotatif creux sans contact

Also Published As

Publication number Publication date
GB2090074A (en) 1982-06-30

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): CH DE FR LI SE

17P Request for examination filed

Effective date: 19831013

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19850808

IECL Ie: translation for ep claims filed
RIN1 Information on inventor provided before grant (corrected)

Inventor name: LABATO, H.

Inventor name: BIRCH, ERNEST HENRY