Wave propagation on multifilar helices

  title={Wave propagation on multifilar helices},
  author={H. R. Johnson and Thomas E. Everhart and Anthony E. Siegman},
  journal={IRE Transactions on Electron Devices},
The modes of the sheath helix are shown to be related closely to the space harmonics of real helices. Multiwire helices propagate many modes, the principal space-harmonic component of each approaching more closely the appropriate sheath helix mode as the number of wires is increased. Each mode can be excited by a certain phase sequence of exciting currents for the wires in one transverse plane. Experimental verification of the theory is reported using a bifilar helix tube. Phase velocities and… 

Strapped bifilar helices for high-peak-power traveling-wave tubes

A method of increasing the peak-pulsed power output of broad-band traveling-wave tubes is described. The method involves the use of a modified bifilar helix for the slow-wave structure. The

Periodic and Guiding Structures at Microwave Frequencies

The paper reviews the properties of periodic and guiding structures which now play an important part in the operation of components, antennas, electron tubes and low-noise amplifiers. An account is

Dispersion analysis of the solid helical pulse-forming line

In this paper, a solid helical pulse-forming line (HPFL) is described. The electromagnetic (EM) dispersion theory is used to calculate the important parameters of the HPFL based on tape helix model.

Effects of dielectric discontinuity on the dispersion characteristics of the tape helix slow-wave structure with two metal shields

In the tape helix slow-wave system, discontinuous dielectrics have great effects on the dispersion characteristics. In this paper, the tape helix slow-wave system, including an inner and an outer

Effects of dispersion on electromagnetic parameters of tape-helix Blumlein pulse forming line of accelerator

In this paper, the tape-helix model is firstly introduced in the field of intense electron beam accelerator to analyze the dispersion effects on the electromagnetic parameters of helical Blumlein

Characteristics of Bifilar Helix Circuit

The characteristics of two kinds of bifilar helix circuit are discussed in this paper. One is alike wound bifilar helix and another is contrawound bifilar helix. Alike wound bifilar helix is often

Traveling-wave amplifiers and backward-wave oscillators for VHF

  • D. A. Dunn
  • Physics
    IRE Transactions on Electron Devices
  • 1957
An important aspect of the design of traveling-wave amplifiers and backward-wave oscillators for frequencies below 500 mc is the problem of obtaining a tube of reasonably small physical dimensions.

A Dual-Band Bifilar Helical Antenna With Parasitic Parallelogram Loops

  • W. TanZhongxiang Shen
  • Business
    2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting
  • 2019
In this paper, a dual-band bifilar helical antenna with two conformal parasitic parallelogram loops is presented. The bifilar helical strips are printed on the outer surface of a Rogers RT/Duroid

Breakdown strength of glycerin in helical transmission line under hundred-nanosecond pulse

In this paper, a transmission line with five spiral-wires in parallel was designed. The transit time and the characteristic impedance of the transmission line are 200 ns and 14 Ω, respectively. Its

Waves in active and passive periodic structures: A review

The theory and recent applications of waves in periodic structures are reviewed. Both the Floquet and coupled waves approach are analyzed in some detail. The theoretical part of the paper includes



Coupling of Modes in Helixes

Propagation on a. helix as a function of frequency is characterized by ranges in which there is a slow wave which can be explained as very nearly a transverse electromagnetic wave traveling along the

Electromagnetic Wave Propagation on Helical Structures (A Review and Survey of Recent Progress)

The progress which has been made in recent years in analyzing and understanding the electromagnetic properties of helical structures is reviewed here. After a brief account of work prior to about

The Helix as a Backward-Wave Circuit Structure

The impedance Em2/2βm2P of the backward wave on helical structures is considered from the point of view of the design of backward‐wave oscillators. Curves of impedance versus ka (circumference to

Theory of the Beam-Type Traveling-Wave Tube

The small-signal theory of the beam traveling-wave tube has been worked out. The equations predict three forward waves, one increasing and two attenuated, and one backward wave which is little

Backward-Wave Oscillators

The Pierce traveling-wave tube theory is modified to apply to the backward-wave oscillator. Theoretical dependence of both starting current and frequency upon space charge and circuit loss is

Helix Impedance Measurements Using an Electron Beam

Impedance measurements made on a tape helix with an electron beam are described. Curves showing the measured impedances of the fundamental and first backward space‐harmonic components of the mode

Experimental Determination of Helical-Wave Properties

The properties of the wave propagated along a helix used in the traveling-wave amplifier are discussed. A description is given of measurements of field strength on the axis, field distribution around