Accession Number : ADA112607

Title :   On the Effect of Substrate Thickness and Permittivity on Printed Circuit Dipole Properties.

Descriptive Note : Technical rept.,


Personal Author(s) : Katehi,P B ; Alexopoulos,N G

PDF Url : ADA112607

Report Date : Dec 1981

Pagination or Media Count : 35

Abstract : The effect of substrate thickness and relative permittivity on the radiation properties of printed circuit dipoles (PCD's) is investigated. A trade-off between substrate thickness and resonant input resistance, bandwidth and radiation efficiency is presented for a PTFE glass random fiber substrate. It is found that for a fixed substrate thickness B, the resonant length and directivity decrease with increasing relative dielectric constant epsilon sub r. The E-plane normalized power pattern is also examined as a function of epsilon sub r and B. It is shown that even for very thin substrates, multiple beam radiation can result for certain values of epsilon sub r by the excitation of surface waves. Multiple beam patterns can also be obtained with increasing B for a given epsilon sub r. In fact, as B increases it is determined that the resonant length, bandwidth and resonant resistance approach the apparent value of a PCD on a dielectric half space. (Author)

Descriptors :   *Printed circuit boards, *Dipoles, *Substrates, *Thickness, Radiation patterns, Multiple beams(Radiation), Dielectric properties, Power, Resistance, Resonance, Fiberglass, Excitation, Surface waves, Length

Subject Categories : Line, Surface and Bulk Acoustic Wave Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE