GB654734A - Improvements in reflectors for radiant energy - Google Patents

Improvements in reflectors for radiant energy

Info

Publication number
GB654734A
GB654734A GB23747/48A GB2374748A GB654734A GB 654734 A GB654734 A GB 654734A GB 23747/48 A GB23747/48 A GB 23747/48A GB 2374748 A GB2374748 A GB 2374748A GB 654734 A GB654734 A GB 654734A
Authority
GB
United Kingdom
Prior art keywords
band
sphere
reflective
path
wavelength
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.)
Expired
Application number
GB23747/48A
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.)
RCA Corp
Original Assignee
RCA Corp
Radio Corporation of America
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 RCA Corp, Radio Corporation of America filed Critical RCA Corp
Publication of GB654734A publication Critical patent/GB654734A/en
Expired legal-status Critical Current

Links

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
    • H01Q15/23—Combinations of reflecting surfaces with refracting or diffracting devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/75—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors
    • G01S13/751—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors wherein the responder or reflector radiates a coded signal
    • G01S13/756—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors wherein the responder or reflector radiates a coded signal using a signal generator for modifying the reflectivity of the reflector

Abstract

654,734. Reflex reflectors. RADIO CORPORATION OF AMERICA. Sept. 9, 1948, No. 23747. Convention date, Oct. 1, 1947. [Class 97 (i)] [Also in Group XL (c)] A reflector for use as a marker beacon returns incident radiant energy along a path substantially coincident with that along which it arrives independently of the azimuth of said path, and comprises a dielectric sphere 1 having a radius of at least one wavelength, together with a band 3 formed either wholly or partly of metallic material embracing the sphere at an equator. Incident rays such as 7, 9 are refracted to strike band 3 at point 11 and are reflected to return along path 7<SP>1</SP>, 9<SP>1</SP>. The diameter of band 3 depends upon the refractive index of the material of the sphere, and the band may lie outside or inside the sphere. The width of the band is one half-wavelength or more. In a further embodiment, Fig. 2 (not shown), the band is formed of alternate segments of reflective and non-reflective material and the assembly rotated so that the reflective and non-reflective segments come into line successively with the incident rays by which means the reflected rays are interrupted or coded so as to produce a characteristic indication.
GB23747/48A 1947-10-01 1948-09-09 Improvements in reflectors for radiant energy Expired GB654734A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US777355A US2580921A (en) 1947-10-01 1947-10-01 Radio reflector

Publications (1)

Publication Number Publication Date
GB654734A true GB654734A (en) 1951-06-27

Family

ID=25110014

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23747/48A Expired GB654734A (en) 1947-10-01 1948-09-09 Improvements in reflectors for radiant energy

Country Status (2)

Country Link
US (1) US2580921A (en)
GB (1) GB654734A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2917740A (en) * 1952-06-25 1959-12-15 Marconi Wireless Telegraph Co Radio beacons
GB2192309A (en) * 1977-12-16 1988-01-06 Elliott Bros Energy reflectors
GB2192308A (en) * 1977-12-16 1988-01-06 Elliott Bros Energy reflective bodies

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2822539A (en) * 1952-06-06 1958-02-04 Edward B Mcmillan Microwave radiation absorbers
US3017608A (en) * 1954-07-07 1962-01-16 William J Toulis Spherical acoustical lens system for focusing underwater sound
US2921305A (en) * 1955-10-28 1960-01-12 Lab For Electronics Inc Microwave reflector
US2866971A (en) * 1956-09-05 1958-12-30 Kenneth S Kelleher Radiant energy reflector
US2990545A (en) * 1958-06-17 1961-06-27 Ite Circuit Breaker Ltd Broad-band omnidirectional spherical lens antenna with rotating amplitude modulationpattern
US3222675A (en) * 1959-12-14 1965-12-07 Trw Inc Means for positioning a plurality of elements in orbit about a celestial body
US3200400A (en) * 1960-08-19 1965-08-10 Karl W Flocks Wide angle high frequency reflecting device
US3206749A (en) * 1961-03-20 1965-09-14 Ryan Aeronautical Co Spherical checkerboard reflector
US3145382A (en) * 1961-08-21 1964-08-18 Emerson & Cuming Inc Microwave reflector
US3116486A (en) * 1961-12-29 1963-12-31 Anton M Johnson Luneberg lens system
US4090198A (en) * 1964-08-31 1978-05-16 General Motors Corporation Passive reflectance modulator
US3295132A (en) * 1965-02-23 1966-12-27 Texas Instruments Inc Modulating radar reflector
US3334345A (en) * 1965-06-02 1967-08-01 Micronetics Inc Passive radar target augmentor
JPS5237906B2 (en) * 1972-07-13 1977-09-26
US3958246A (en) * 1974-07-05 1976-05-18 Calspan Corporation Circular retrodirective array
US4884076A (en) * 1982-09-29 1989-11-28 Calspan Corporation Foam supported electromagnetic energy reflecting device
US4698636A (en) * 1984-04-20 1987-10-06 Raymond Marlow Ground speed determining radar system
GB8603206D0 (en) * 1986-02-10 1986-03-19 Ca Minister Nat Defence Projectile
WO2020088755A1 (en) * 2018-10-31 2020-05-07 Nokia Technologies Oy Apparatus for Reflecting Electromagnetic Waves and Method of Operating such Apparatus

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US888056A (en) * 1907-07-13 1908-05-19 Charles D Lyons Jewelry.
US2120524A (en) * 1929-08-30 1938-06-14 American Gasaccumulator Co Self-focusing reflector device
US2133615A (en) * 1935-01-05 1938-10-18 Telefunken Gmbh Ultra-short wave receiving system
US2068950A (en) * 1935-02-28 1937-01-26 Hamilton Frederick Optical educational device
US2155092A (en) * 1936-02-20 1939-04-18 Microphone Corp Of America Reflector
US2212110A (en) * 1936-08-15 1940-08-20 Telefunken Gmbh Radio beacon system
US2455469A (en) * 1945-10-11 1948-12-07 Pak Parachute Company Ltd Meteorological balloon

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2917740A (en) * 1952-06-25 1959-12-15 Marconi Wireless Telegraph Co Radio beacons
GB2192309A (en) * 1977-12-16 1988-01-06 Elliott Bros Energy reflectors
GB2192308A (en) * 1977-12-16 1988-01-06 Elliott Bros Energy reflective bodies

Also Published As

Publication number Publication date
US2580921A (en) 1952-01-01

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