Title :
A simple method for measuring the relative permittivity of printed circuit board materials
Author :
Namba, Akihiro ; Wada, Osami ; Toyota, Yoshitaka ; Fukumoto, Yukihiro ; Wang, Zhi Liang ; Koga, Ryuji ; Miyashita, Takuya ; Watanabe, Tetsushi
Author_Institution :
Fac. of Eng., Okayama Univ., Japan
fDate :
11/1/2001 12:00:00 AM
Abstract :
This paper presents a simple method to measure the relative permittivity of glass-epoxy printed circuit boards (PCBs). In this method, the relative permittivity as a function of frequency is measured using an actual PCB. In order to estimate the relative permittivity, the reflection coefficient is measured with a network analyzer. The relative permittivity is calculated by observing the frequencies of the resonant cavity modes. We show that the relative permittivity of an FR-4 sample decreases from 4.3 to 4.2 at frequencies from 300 MHz to 2 GHz
Keywords :
cavity resonators; electromagnetic wave refraction; network analysers; permittivity measurement; printed circuit testing; 300 MHz to 2 GHz; EMI; FR-4 sample; cavity resonator; electromagnetic interference; glass-epoxy PCB; network analyzer; printed circuit board materials; reflection coefficient; relative permittivity measurement; resonant cavity modes; Bandwidth; Cavity resonators; Dielectric materials; Dielectric measurements; Digital circuits; Frequency measurement; Permittivity measurement; Printed circuits; Resonance; Resonant frequency;
Journal_Title :
Electromagnetic Compatibility, IEEE Transactions on
