𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Modes of the contrawound toroidal helix antenna

✍ Scribed by R. C. Hansen; Richard Ridgley

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
112 KB
Volume
23
Category
Article
ISSN
0895-2477

No coin nor oath required. For personal study only.

✦ Synopsis

The contrawound toroidal helix antenna with constant current is examined; it has an omnidirectional pattern in the toroid plane. Radiation resistance is deri¨ed for the dipole mode, and results are ¨alidated by moment-method calculations. The radiation Qs of these antennas are greater than one million, making them unsuitable as dipole mode radiators. Ratios of loop-mode to dipole-mode radiation resistances range from se¨eral hundred to large ¨alues.

πŸ“œ SIMILAR VOLUMES

Resonant contrawound toroidal helix ante
Resonant contrawound toroidal helix antenna
✍ R. C. Hansen πŸ“‚ Article πŸ“… 2001 πŸ› John Wiley and Sons 🌐 English βš– 114 KB

## Abstract The resonant CWTHA is examined via a moment‐method simulation. The results show a very high impedance at first resonance with a narrow bandwidth and low efficiency. At second resonance, the resistance is less than an ohm, the reactance is zero, and again, the bandwidth is narrow. The az

Two-turn contrawound toroidal helix ante
Two-turn contrawound toroidal helix antenna
✍ R. C. Hansen πŸ“‚ Article πŸ“… 2002 πŸ› John Wiley and Sons 🌐 English βš– 71 KB

## Abstract The two‐turn CWTHA is analyzed from a small diameter that allows constant current, through the third resonance. Around the third resonance, and around the first resonance and below, the bandwidth is much less than 1%. The very low (or very high) values of resistance make matching diffic

Measuring the input impedance of a quadr
Measuring the input impedance of a quadrifilar helix antenna
✍ Olli P. M. Pekonen; Veli Santomaa; Kalle Kiesi; Murat E. Ermutlu; Kati Wilska πŸ“‚ Article πŸ“… 1998 πŸ› John Wiley and Sons 🌐 English βš– 212 KB πŸ‘ 2 views

In this paper, different methods for measuring the input ( ) impedance of a quadrifilar helix QFH antenna are presented along with the underlying physical theory. Shortcomings of the known slotted line method are discussed. New practical and efficient ways of the input impedance deri¨ation based on

Raman and normal-mode studies of the ext
Raman and normal-mode studies of the extended-helix conformation in polypeptide chains
✍ P. K. Sengupta; S. Krimm πŸ“‚ Article πŸ“… 1987 πŸ› Wiley (John Wiley & Sons) 🌐 English βš– 540 KB

The nature of the local main-chain conformation of polypeptides with charged side chains has been the subject of considerable discussion since Tiffany and Krimm first proposed [(l968) Bwpoljmers 6, 1379-13811 that, rather than being random, the chain is locally relatively regular, with conformations

The characteristics of an aperture-coupl
The characteristics of an aperture-coupled' microstrip antenna at the TM11 mode
✍ P. Paul; J. S. Roy; S. K. Chowdhury πŸ“‚ Article πŸ“… 1996 πŸ› John Wiley and Sons 🌐 English βš– 341 KB πŸ‘ 1 views

## We present an aperture-coupled microship antenna for mobile applications. The antenna is investigated eperimental(y and its measured impedance and radiation propetiies are verijied by a cavity model. A theory for an aperture-coupled microship antenna at higher-order modes is developed by applicat