GB580810A - Improvements in or relating to high frequency impedance transformers - Google Patents

Improvements in or relating to high frequency impedance transformers

Info

Publication number
GB580810A
GB580810A GB16164/43A GB1616443A GB580810A GB 580810 A GB580810 A GB 580810A GB 16164/43 A GB16164/43 A GB 16164/43A GB 1616443 A GB1616443 A GB 1616443A GB 580810 A GB580810 A GB 580810A
Authority
GB
United Kingdom
Prior art keywords
impedance
section
resistance
guide
wave
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
GB16164/43A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB16164/43A priority Critical patent/GB580810A/en
Priority to US584627A priority patent/US2507692A/en
Priority to FR932218D priority patent/FR932218A/en
Publication of GB580810A publication Critical patent/GB580810A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
    • H01P5/082—Transitions between hollow waveguides of different shape, e.g. between a rectangular and a circular waveguide
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/02—Coupling devices of the waveguide type with invariable factor of coupling

Landscapes

  • Waveguides (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

580,810. Impedance transformers. COLLARD, J. Oct. 1, 1943, Nos. 16164 and 21250. [Classes 40 (iii) and 40 (v)] A device for converting an impedance A+jB into a pure resistance comprises a length of wave-guide, the characteristic impedance Zo of which is equal to (- kB + #k<2>B<2> + 4(A<2>+B<2>)) /2 where k=1-tan<2>#/tan #. In the prefer red case in which the length chosen is #/8, k =0 and Zo=#A<2>+B<2>. The invention also includes a similar impedance transformer comprising a #8 length of transmission line in which Zo=#A<2>+B<2>. The device may be associated with a #/4 line to convert the pure resistance to a resistance of different value. The invention may be employed for matching a coaxial line to a wave guide as shown in Fig. 4. The complex impedance presented at the point at which the probe 15 enters the wave guide is converted by a #/8 section 16 having a characteristic impedance equal to the modulus of the complex impedance to a pure resistance and this resistance is converted to a resistance of suitable value by a #/4 section 17. By this means, two pieces of wave guide may be connected together at an angle or flexibly by providing a flexible coupling as described in Specification 579,974 between two coaxial lines matched to wave guides in the manner described. Where the matching device is a rectangular wave guide, and energy is to be transmitted in the H1, 0 mode the desired characteristic impedance is derived from the formula Zo=377 / #k-(#o/2a)<2> where a is the longer side of the cross-section and #o is the wavelength in air and k is the dielectric constant of the material of the guide. In case suitable dielectrics are not available, two #/8 sections can be used having characteristic impedances Z1, Z2 such that Alternatively a #/4 section may be used to transform the complex impedance to one that can be converted to a pure resistance by a #/8 section using an available dielectric. Specification 579,073 also is referred to.
GB16164/43A 1943-10-01 1943-10-01 Improvements in or relating to high frequency impedance transformers Expired GB580810A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB16164/43A GB580810A (en) 1943-10-01 1943-10-01 Improvements in or relating to high frequency impedance transformers
US584627A US2507692A (en) 1943-10-01 1945-03-24 High-frequency impedance transformer for transmission lines
FR932218D FR932218A (en) 1943-10-01 1946-08-13 High frequency impedance transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB16164/43A GB580810A (en) 1943-10-01 1943-10-01 Improvements in or relating to high frequency impedance transformers

Publications (1)

Publication Number Publication Date
GB580810A true GB580810A (en) 1946-09-20

Family

ID=10072313

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16164/43A Expired GB580810A (en) 1943-10-01 1943-10-01 Improvements in or relating to high frequency impedance transformers

Country Status (3)

Country Link
US (1) US2507692A (en)
FR (1) FR932218A (en)
GB (1) GB580810A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1028179B (en) * 1956-10-05 1958-04-17 Siemens Ag Matching transformer in the form of a ladder arrangement
DE970328C (en) * 1954-07-28 1958-09-11 Siemens Ag Reflection-free connection for high-frequency transmission lines

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE976706C (en) * 1948-10-02 1964-03-05 Ludwig Vanwersch Shell iron for pit lining
US2861245A (en) * 1952-09-26 1958-11-18 Gen Electric Electrical transmission systems and filters therefor
US3218584A (en) * 1964-01-02 1965-11-16 Sanders Associates Inc Strip line connection
US4849981A (en) * 1987-10-05 1989-07-18 General Electric Company High frequency signal driver for a laser diode and method of forming same

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB436012A (en) * 1934-04-17 1935-10-03 Eric Lawrence Casling White Improvements in or relating to high frequency transmission systems
US2207690A (en) * 1936-06-18 1940-07-09 Emi Ltd High frequency signaling system
US2241582A (en) * 1938-10-07 1941-05-13 Telefunken Gmbh Arrangement for matching antennae for wide frequency bands
US2433011A (en) * 1943-04-08 1947-12-23 Sperry Gyroscope Co Inc Ultra high frequency energy coupling

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE970328C (en) * 1954-07-28 1958-09-11 Siemens Ag Reflection-free connection for high-frequency transmission lines
DE1028179B (en) * 1956-10-05 1958-04-17 Siemens Ag Matching transformer in the form of a ladder arrangement

Also Published As

Publication number Publication date
FR932218A (en) 1948-03-16
US2507692A (en) 1950-05-16

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