US2331101A - Inductor - Google Patents

Inductor Download PDF

Info

Publication number
US2331101A
US2331101A US424533A US42453341A US2331101A US 2331101 A US2331101 A US 2331101A US 424533 A US424533 A US 424533A US 42453341 A US42453341 A US 42453341A US 2331101 A US2331101 A US 2331101A
Authority
US
United States
Prior art keywords
inductor
winding
reactance
resistance
litzendraht
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 - Lifetime
Application number
US424533A
Inventor
Joseph G Beard
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
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 filed Critical RCA Corp
Priority to US424533A priority Critical patent/US2331101A/en
Application granted granted Critical
Publication of US2331101A publication Critical patent/US2331101A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F21/00Variable inductances or transformers of the signal type
    • H01F21/02Variable inductances or transformers of the signal type continuously variable, e.g. variometers

Definitions

  • This invention relates to improvements in inductors, and particularly to a radio frequency inductor wound with a combination of stranded and solid wire conductors to obtain a predetermined ratio of reactance to resistance throughout the operating frequency range.
  • One of the objects of the instant invention is to provide an improved inductor with means for compensating for variations of its reactance to resistance ratio in the operable frequency range. Another object is to provide an improved inductor in which a. cable of separately insulated conductors (usually called Litzendraht) and a solid wire conductor are used to provide compensation throughout the operable frequency range. An additional object is to provide means for compensating for the variation of the ratio of reactance to resistance as a function of frequency by using a combination of solid wire and Litzendraht.
  • the invention has been described as an inductor ⁇ including windings of solid and Litzendraht conductors so related that the ratio of reactance to resistance of one conductor is cornpensated by the ratio of reactance to resistance of the other conductor, whereby a more uniformly varied Q is obtained through the frequency range than would be obtained with the Litzendraht only.
  • the inductors using the compound windings may be connected in series or in shunt with proper regard for the individual and algebraic sums of the inductances of the individual windings.
  • An inductor including a winding of solid wire and a winding of Litzendraht, said windings having different ratios of reactance to resistance whereby the resultant ratio of reactance to resistance. has a predetermined value intermediate said ratios over the operable frequency range.
  • a radio frequency inductor having a solid zo of theother winding atsaid frequencies.
  • a radio frequency inductor having a solid wire winding and a Litzendraht winding connected in series, the ratio of the reactance to the resistance of the Litzendraht winding exceeding ,the ratio; of the reactance to the resistance of the vsolid Wire winding at the lower operating frequencies whereby the rate of variation with frequency of the Q of one winding compensates for the rate of variation with frequency of the Q of the other winding at said frequencies.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)

Description

oct. 5, 1943. J Q BEARD 2,331,101
INDUCTOR Filed DSC. 26 1941 Simentor Cttorneg Patented Oer. s, 1943 rNnUc'roa Joseph G. Beard, Haddonileld, N. J., assignor to Radio Corporation of America, a corporation of Delaware Application December 26, 1941, Serial No. 424,533
6 Claims.
This invention relates to improvements in inductors, and particularly to a radio frequency inductor wound with a combination of stranded and solid wire conductors to obtain a predetermined ratio of reactance to resistance throughout the operating frequency range.
The ratio of the reactance to the effective resistance of a radio frequency inductor is known as the Q of the inductor. The Q of an inductor is its figure of merit, i. e., the higher the Q the greater will be the resonance rise in the resonant circuit including the coil. In inductors of the prior art type the Q usually varies widely at the diiferent frequencies, whereby the gain varies with frequency or the Q may be unduly low.
While it is desirable to have a high gain circuit, it is often desirable to have a gain which is constant, or at least does not vary too rapidly, throughout the operable frequency range. In some prior art devices, constant gain is obtained by using compound coupling, by using loss methods, or by using mechanically variable coupling.
One of the objects of the instant invention is to provide an improved inductor with means for compensating for variations of its reactance to resistance ratio in the operable frequency range. Another object is to provide an improved inductor in which a. cable of separately insulated conductors (usually called Litzendraht) and a solid wire conductor are used to provide compensation throughout the operable frequency range. An additional object is to provide means for compensating for the variation of the ratio of reactance to resistance as a function of frequency by using a combination of solid wire and Litzendraht.
The invention will be described by referring to the accompanying drawing, in which Figs. 1, 2 and 3 are circuit diagrams in which the inductors are constructed according to the invention, and Fig. 4 is a graph illustrating the difference in characteristics of Litzendraht and solid wire. Similar reference characters indicate similar elements.
Referring to Fig. 4, the lower curve I, marked solid wire, shows the Q or reactance to resistance characteristic, with respect to frequency, of an inductor wound with solid wire and resonated over the frequency range with a capacitor having the appropriate reactance. The curve l, marked Litzendraht," represents the corresponding characteristic for an inductor wound with Litzendraht. The intermediate curve 5 represents the characteristics of an inductor wound with both solid and Litzendraht conductors. It will be 0bserved that the combined winding has a Q intermediate the values of the other curves i, 3. The rate of change of Q of the Litzendraht inductor is compensated by the rate of change of Q of the solid wire inductor at frequencies lower than 1100 kilocycles per second. At higher frequencies the decreasing rate of change of Q characteristic of the Litzendraht winding is offset by the increasing rate of change of Q of the solid wire winding. The graph shows clearly that the inductor composed of the combined windings has aV Q of which the rate of change is more uniform than the rate of change of the Q of the inductor wound only with Lltzendraht, and a Q which is higher from 400 to 1100 kc. than the inductor wound only with a solid conductor.
The foregoing example, while taken from actual tests of coils of similar inductance, is not intended to represent the maximum obtainable results. It should be understood that different or the same amounts of inductance may be employed to vary the resultant characteristic. 'I'he inductors 1, 9 may be wound on separate forms and may be connected in parallel as shown in Fig. l, or may be connected in series as shown in Fig. 2. Whilethe inductors are not mutually coupled in Figs. 1 and 2, they may be mutually coupled as indicated in Fig. 3.
Thus the invention has been described as an inductor `including windings of solid and Litzendraht conductors so related that the ratio of reactance to resistance of one conductor is cornpensated by the ratio of reactance to resistance of the other conductor, whereby a more uniformly varied Q is obtained through the frequency range than would be obtained with the Litzendraht only. The inductors using the compound windingsmay be connected in series or in shunt with proper regard for the individual and algebraic sums of the inductances of the individual windings.
I claim as my invention:
l. An inductor including a winding of solid wire and a winding of Litzendraht, said windings having different ratios of reactance to resistance whereby the resultant ratio of reactance to resistance. has a predetermined value intermediate said ratios over the operable frequency range.
2. An inductor including a winding of a solid conductor, and another winding of a cable of insulated conductors, said windings having ratios of reactance to resistance which vary differently throughout the operable frequency range and having a combined ratio of reactance to resistance of a value intermediate said ratios.
ratio of the reactance to the resistance of the wire winding and a Litzendraht winding connectedin shunt, the ratio of the reactance to the resistance of the Litzendraht winding exceeding the ratio of the reactance to the resistance of the solid wire winding at the lower operating frequencies whereby the rate of variation with frequency of the Q of one winding compensates for Y the ratel of. variation with frequency of the Q Ltzendraht winding exceeding the ratio of-'the reactance to the resistance of the solid wire winding at the lower operating .frequencies'whereby the rate of variation with frequency of the Q of one winding compensates for the rate of variation with frequency of the Q of the other windin at said frequencies. f
5. A radio frequency inductor having a solid zo of theother winding atsaid frequencies.
6. A radio frequency inductor having a solid wire winding and a Litzendraht winding connected in series, the ratio of the reactance to the resistance of the Litzendraht winding exceeding ,the ratio; of the reactance to the resistance of the vsolid Wire winding at the lower operating frequencies whereby the rate of variation with frequency of the Q of one winding compensates for the rate of variation with frequency of the Q of the other winding at said frequencies.
JOSEPH G. BEARD.
US424533A 1941-12-26 1941-12-26 Inductor Expired - Lifetime US2331101A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US424533A US2331101A (en) 1941-12-26 1941-12-26 Inductor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US424533A US2331101A (en) 1941-12-26 1941-12-26 Inductor

Publications (1)

Publication Number Publication Date
US2331101A true US2331101A (en) 1943-10-05

Family

ID=23682957

Family Applications (1)

Application Number Title Priority Date Filing Date
US424533A Expired - Lifetime US2331101A (en) 1941-12-26 1941-12-26 Inductor

Country Status (1)

Country Link
US (1) US2331101A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2526549A (en) * 1946-02-02 1950-10-17 Rca Corp Radio-frequency current transformer
US20080007425A1 (en) * 2005-05-21 2008-01-10 Hall David R Downhole Component with Multiple Transmission Elements
US20080012569A1 (en) * 2005-05-21 2008-01-17 Hall David R Downhole Coils
US8130118B2 (en) 2005-05-21 2012-03-06 Schlumberger Technology Corporation Wired tool string component
US8264369B2 (en) 2005-05-21 2012-09-11 Schlumberger Technology Corporation Intelligent electrical power distribution system
US8519865B2 (en) 2005-05-21 2013-08-27 Schlumberger Technology Corporation Downhole coils

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2526549A (en) * 1946-02-02 1950-10-17 Rca Corp Radio-frequency current transformer
US20080007425A1 (en) * 2005-05-21 2008-01-10 Hall David R Downhole Component with Multiple Transmission Elements
US20080012569A1 (en) * 2005-05-21 2008-01-17 Hall David R Downhole Coils
US8130118B2 (en) 2005-05-21 2012-03-06 Schlumberger Technology Corporation Wired tool string component
US8264369B2 (en) 2005-05-21 2012-09-11 Schlumberger Technology Corporation Intelligent electrical power distribution system
US8519865B2 (en) 2005-05-21 2013-08-27 Schlumberger Technology Corporation Downhole coils

Similar Documents

Publication Publication Date Title
US2331101A (en) Inductor
US1965649A (en) Power transformer for radiofre quency work having a broad transmission range
US1837413A (en) Inductive coupling device
US2598467A (en) Compensating means for variable inductances having magnetic cores
US2246385A (en) Signal collecting system for radio receivers
US2395165A (en) High frequency transformer
US2322722A (en) Permeability tuning system
US2289821A (en) Degenerative audio amplifier
US2541650A (en) Wave length modulation
US2477475A (en) Adjustable coupling transformer
US2125119A (en) Coupling transformer
US1936438A (en) Coupling means
US2159944A (en) Coupling arrangement for amplifiers and repeaters
US2673961A (en) Inductance coil
US2406720A (en) Inductance device
US1957796A (en) Tuning arrangement
US1666518A (en) vreeland
US1910399A (en) Wave signaling system
US2082587A (en) High-frequency circuit
US2402260A (en) Permeability tuned short-wave spread-band receiver
US1829058A (en) High frequency transformer
US2248466A (en) Band pass coupling network
US1950541A (en) Carrier frequency receiving circuits
US2454865A (en) Time-delay network
US2427331A (en) Tuning device comprising at least two tuning circuits having an unequal frequency range