US3916354A - Attenuator for a wide range of frequencies - Google Patents

Attenuator for a wide range of frequencies Download PDF

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Publication number
US3916354A
US3916354A US515560A US51556074A US3916354A US 3916354 A US3916354 A US 3916354A US 515560 A US515560 A US 515560A US 51556074 A US51556074 A US 51556074A US 3916354 A US3916354 A US 3916354A
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Prior art keywords
conductors
attenuator
electrodes
pair
deposited
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Expired - Lifetime
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US515560A
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English (en)
Inventor
Noboru Tomimura
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Iwatsu Electric Co Ltd
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Iwatsu Electric Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/22—Attenuating devices
    • H01P1/227—Strip line attenuators

Definitions

  • a rectangular resistive member is deposited on the surface of the dielectric plate and is contiguously interposed between two pairs of highly conductive electrodes.
  • An impedance compensation member having substantially the same shape as the rectangular resistive member is deposited on either the inner surface of the first outer-conductor or the second outer-conductor so as to at least compensate for variation of the characteristic impedance produced when a high frequency current flows in the electrodes.
  • FIG. 1 A first figure.
  • This invention relates in general to an attenuator for a wide range of frequencies and more particularly to attenuators with extremely little variation in characteristic impedance and in attentuation over the wide frequency range.
  • This invention provides for an attenuator which is based on the attenuator of the above-mentioned patent and which improves the defects which result from the conventional,attenuator.
  • the conventional attenuator as shown in FIG. 1 having the same principle of operation as the attenuator disclosed in the above-mentioned patent has certain defects in that when a current I, at a microwave frequency flows in highly conductive electrodes 5a, 5b, the characteristic impedance Zo varies and a variation in attenuation occurs wherein a load having an impedance 20 equal to the characteristic impedence Z is connected between the electrode b and an outer: conductor 2 as shown in FIG. 2. For this reason, where the current I flows in highly conductive electrodes 5a, 5b, lines of electric force are generated perpendicular to the electrodes 5a, 5b, and reach the inner surface of outer-conductors 1', 2.
  • anattenuator plate and contiguously interposed between two pairs of highly conductive electrodes.
  • An impedance compensation member having substantially the same shape as the rectangular resistive member is.dep osited on at least either the inner surface of the first conductoror the second outer-conductor so as to compensate for variation in characteristic impedance. Zo produced when a high frequency current flows in the highlyconductive electrodes.
  • FIG. 1 shows a cutaway view, partly in section, of a conventional attenuator
  • I FIG. 2 illustrates a side andcutaway'view of the attenuator shown in FIG. 1.
  • FIG. 3 shows a perspective view and a cutawayview, partly in section, of a first preferred embodiment of the invention.
  • FIG. 4 and FIG. 5 are front and sideviews of the attenuator shown inFIG. 3 respectively.
  • FIG. 6 shows a perspective and a cutaway view, partly in section, of a second preferred embodiment of the invention.
  • FIG. 7 and FIG. 8 are frontand side views of the-attenuator shown in FIG. 6 respectively.
  • FIG. 9 illustrates a perspective view and acutaway view, partly in section, of a third preferred embodiment of the. invention.
  • FIG. ,10.and FIG. 11 are front and side views of the attenuator shown in FIG. 9 respectively.
  • FIG. 12 shows a perspective view and a cutaway view, partly in section, of a fourth preferred embodiment of the invention.
  • FIG. 13' and FIG. 14 are front and side views of the attenuator shown in FIG. 12 respectively.
  • FIG. 15 and FIG. 16v show perspective views and cutaway views, partly'in section, of fifth andsixth preferred embodiments of the invention respectively.
  • FIG. 17 shows a front view of a seventh preferred embodiment of the invention DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • a first preferred embodiment of the invention will be explained by referring to the drawings of FIG. 3, FIG. 4 and FIG. 5.
  • the first embodiment shows a bidirectional attenuator. i
  • the numerals 1 and 2 designate afirstand .a second outer conductor respectively, both .of which are provided with U shaped grooves.
  • a set of the first and secand outer conductors 1, 2 forms a,hollow conductor'3.
  • the lengthwise upper edges of the inner wall sides of the, first and second outer conductors l, 2 are provided with an L shaped notch, a set. of which forms shaped grooves.
  • Adielectric plate 4- is in the shaped grooves so as to-be supported by the-grooves.
  • a rectangular resistive member 6a is deposited on thesurface ofthe dielectric plate 4 by sputtering techniques and the like which are well known in the art and contiguously interposed between third conductors 5a, 5b and fourth con-'v ductors 7, 8.
  • the third conductors 5a, 5b are highly conductive electrodes and are provided on a central portion of the dielectric plate 4 through the rectangular resistive member 6a.
  • the fourth conductors 7, 8 are disposed between the outer conductors l, 2 and the lengthwise edges of the rectangular resistive member 60 along the full length thereof so as to provide electrical signal connections.
  • the entire area of the rectangular resistive member 6a is made to have equal values of resistance.
  • First and second impedance compensation members 9a, 10a having substantially the same shape as the first rectangular member 6a are deposited on the inner surfaces of the first and second conductors l, 2 respectively and are positioned above and under the rectangular resistive member 6a so as to compensate for variation in characteristice impedance Z produced when a high frequency current flows in the electrode a, 5b.
  • the impedance compensation members 9a, a may be a high frequency current I, or flows in the electrode 5b. As shown in FIG. 5, the width of the impedance compensation members 9a, 10a are designed to be longer than the width W of the rectangular resistive member 6a.
  • the above-mentioned positions A and A are generally obtained by a conventional means of drawing figures based on emission angles 42 and (I), and the like or calculation of the lines of electric force.
  • the lines of electric force will radiate from the third conductors 5a, 5b or the rectangular resistive member 6a as shown in the drawing by a dotted line curve.
  • the thickness of the impedance compensation members 9a, 100 are designed so that the distance of the radiated electric force lines from the third conductors 5a, 5b to the inner surfaces of the first and second conductors l, 2 is equal to the distance of the radiated electric force lines from the rectangular resistive member 6a to the impedance compensation members 9a, 10a.
  • the line having the characteristic impedance Z0 includes the third conductors 5a, 5b of width W the fourth conductors 7, 8 and the hollow conductor 3.
  • FIG. 6, FIG.'7 and FIG. 8 show a second preferred embodiment of the present invention.
  • the embodiment of FIG. 6, FIG. 7 and FIG. 8 shows a bi-directional attenuator wherein the impedance compensation member 91) is deposited only on the first outer-conductor 1.
  • the impedance compensation member 9b is designed to be thicker than the impedance compensation members 9a, 10a of the attenuator as shown in FIG. 3'since the impedance match is not as good as that of the embodiment of FIG. 3.
  • FIG. 9, FIG. 10 and FIG. 11 show a third preferred embodiment of the present invention.
  • the embodiment of-FIG. 9, FIG. lOand FIG. 11 shows a bi-directional attenuator wherein the impedance compensation member 10b is deposited only on the second outerconductor 2.
  • the impedance compensation member 10b is designed to be thicker than the impedance compensation members 9a, 10a of FIG. 3 like in the embodiment of FIG. 6, FIG. 7 and FIG. 8.
  • FIG. 12, FIG. 13 and FIG. 14 show a fourth preferred embodiment of this invention.
  • This embodiment is a bidirectional attenuator.
  • FIG. 12 FIG. 13 and FIG. l4 a rectangular resistive member 6b and third conductors 5a, 5b form a T shape-pattern.
  • impedance compensation members 9c, 10c are deposited on the inner surfaces of the outer-conductor l, 2 so as to be positioned above and under the rectangular resistive members 1, 2 respectivelyand so as to compensate for variation in the characteristic. impedance produced when a high frequency current flows in the electrodes 5a, 5b.
  • FIG. 15 and FIG. 16 show bi-directional attenuators of a fifth and a sixth preferred embodiments of the present invention wherein impedance compensation members 9d or 10d are deposited either on the first outerconductor l or on the second outer-conductor 2.
  • FIG. 15 and FIG. 16 have the same effect as the embodiment of FIG. 3, FIG. 4 and FIG. 5.
  • this invention is applicable to a single directional attenuator as well as a bidirectional attenuator.
  • the side edge of the impedance compen sation members 9e and We having the same shape as the rectangular resistive member 6e are deposited on position A, A of the inner surfaces of the first and second outer-conductors l, 2 such that the lines of electric force radiated from boundary B or B of the electrode 5d or 5b and the rectangular resistive member 6e will reach the same when a high frequency current I flows in the electrode 5a.
  • An attenuator having upper and lower contiguous outer-conductors and a pair of coaxial inner conductors comprising:
  • an immpedance compensation member having substantially the same shape as said rectangular resistive member and deposited on at least either the inner surface of said upper outer-conductor or the inner surface of said lower conductor for compensating for variation in characteristic impedance.
  • said impedance compensation member comprises a conductive member.
  • an impedance compensation member having substantially the same shape as said rectangular resistive member and deposited on at least either the inner surface of said upper outer-conductor orthe inner surface of said lower outer-conductor for compensating for variation in characteristic impedance.
  • both edges of the impedance compensation member are deposited at a position at least on either inner surface of the outer conductors such that lines of electric force radiated from the boundaries of the rectangular resistive member and the electrodes will respectively reach said compensation member.

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US515560A 1973-10-20 1974-10-17 Attenuator for a wide range of frequencies Expired - Lifetime US3916354A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11811873A JPS5327104B2 (ja) 1973-10-20 1973-10-20

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US3916354A true US3916354A (en) 1975-10-28

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JP (1) JPS5327104B2 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4450418A (en) * 1981-12-28 1984-05-22 Hughes Aircraft Company Stripline-type power divider/combiner with integral resistor and method of making the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3521201A (en) * 1968-11-01 1970-07-21 Hewlett Packard Co Coaxial attenuator having at least two regions of resistive material
US3761846A (en) * 1970-05-04 1973-09-25 Iwatsu Electric Co Ltd Impedance-matching resistor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3521201A (en) * 1968-11-01 1970-07-21 Hewlett Packard Co Coaxial attenuator having at least two regions of resistive material
US3761846A (en) * 1970-05-04 1973-09-25 Iwatsu Electric Co Ltd Impedance-matching resistor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4450418A (en) * 1981-12-28 1984-05-22 Hughes Aircraft Company Stripline-type power divider/combiner with integral resistor and method of making the same

Also Published As

Publication number Publication date
JPS5068633A (ja) 1975-06-09
JPS5327104B2 (ja) 1978-08-05

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