On the Effect of Substrate Thickness and Permittivity on Printed Circuit Dipole Properties.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1981
- Accession Number
- ADA112607
Entities
People
- N. G. Alexopoulos
- P. B. Katehi
Organizations
- University of California, Los Angeles