Workshop 3

Fundamentals of Practical Antenna Measurement to Get More Accurate Data for Input Impedance and Pattern

Abstract

To examine the antenna characteristics, quantities to be measured are classified according to circuit and spatial aspects. For circuit aspect, there are input impedance, radiation resistance, VSWR, return loss, reflection coefficient, radiation efficiency and bandwidth. For spatial aspect, there are radiation pattern, directivity, gain, beam width, polarization, effective area, RCS, radiation efficiency and bandwidth. In this workshop, for circuit aspect, I will discuss input impedance measurement using a vector network analyzer or VNA, with electrical length compensation and the effect of unbalanced current on the coaxial cable. For spatial aspect, will discuss pattern measurements and related error sources with the methods to reduce them, and gain measurements using comparative method.

About the speaker

Nozomu Ishii received B.S., M.S., and Ph.D degrees from Hokkaido University, Sapporo, Japan, in 1989, 1991, and 1996, respectively. In 1991, he joined the faculty of Engineering at Hokkaido University. Since 1998, he has been with the faculty of Engineering at Niigata University, Japan, where he is currently an Associate Professor of the Department of the Biocybernetics. His current interests are in the area of small antennas and antenna analysis and measurement. He is the author of textbook entitled "Antenna Basic Metrology" written in Japanese. He is now the Chairperson of Expert Committee on Advanced Measurement Technology for Radio Equipment and Antenna System, IEICE, Japan. He is a member of the IEEE.