Physical theory of the electric wave-filter

@article{CampbellPhysicalTO,
  title={Physical theory of the electric wave-filter},
  author={George A. Campbell},
  journal={Bell System Technical Journal},
  volume={1},
  pages={1-32}
}
  • G. A. Campbell
  • Published 1 November 1922
  • Engineering
  • Bell System Technical Journal
Note: The electric wave-filter, an invention of Dr. Campbell, is one of the most important of present day circuit developments, being indispensable in many branches of electrical communication. It makes possible the separation of a broad band of frequencies into narrow bands in any desired manner, and as will be gathered from the present article, it effects the separation much more sharply than do tuned circuits. As the communication art develops, the need will arise to transmit a growing… 

Vector Presentation of Broad Band Wave Filters

The function of a broad-band wave filter of the iterative ladder type in the attenuation band, and outside the attenuation band can be explained very simply when expressed in terms of two

Theory of Electric Wave Filters Built up of Coupled Circuit Elements

  • L. J. Peters
  • Engineering
    Transactions of the American Institute of Electrical Engineers
  • 1923
This paper is essentially a treatment of certain types of coupled circuit networks by methods similar to those used in the discussion of the properties of long lines with distributed constants. This

Wide-band amplifiers for television

The maximum uniform amplification that can be secured over a wide frequency band by means of a single vacuum tube is much greater than that of the usual simple circuits. It can be secured by either

Carrier Systems on Long Distance Telephone Lines

A previous Institute paper in 1921 gave a very complete résumé of the activities of the Bell System at that time in the development of multiplex telephone and telegraph systems using carrier-current

Mutual inductance in wave filters with an introduction on filter design

Principles of Generalized Dissymmetrical Networks. We shall consider first the impedance and propagation characteristics of certain generalized networks, It can be shown that any passive network

Electromagnetic Interference Reduction Filters

This paper presents the theory and application of lumped-image parameter reactive filter networks, absorptive-type filter networks, and combined absorptive-reactive filter networks as conducted

The Sturm-louville-webster Horn Equation

Title: The reactive radiation impedance of acoustic horns. Abstract Here we seek to resolve a subtle paradox about the solutions of the horn, the class of differential equations describing guided

Carrier systems on long distance telephone lines

A new, so-called type C system which supplants earlier types of equipment is described in detail, together with suitable repeaters and pilot channel apparatus for insuring the stability of operation.

Propagation des ondes dans les lignes finies : discussion des notions d'onde évanescente et de fréquence de coupure

2014 The problems of wave propagation in lines occur in one form or another in many fields of physics. The concepts of evanescent wave and cutoff frequency in particular are well known : they are

The evolution of inductive loading for Bell System telephone facilities

Up to this point this review of coil loading has been primarily in terms of transmission features of the loading systems and the coils, and development economics, and for this reason the references
...