Summary
International Symposium on Antennas and Propagation
2010
Session Number:4FC1
Session:
Number:4FC1-1
Elliptical Disk Monopole Antenna with Built-in Diode for PIM-Measurement Facility Assessment
Kenji Irie, Nobuhiro Kuga, Keizo Cho,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
To assess small anechoic chambers in terms of passive intermodulation (PIM), antennas generating stable PIM of which level can be controlled would be useful. As a method to generate the stable PIM, the incorporation of a diode into the parasitic element of a patch antenna was proposed [1]. Its maximum PIM level can be determined by rotating the parasitic element because the rotation of the parasitic element does not degrade both of the input characteristics and radiation pattern. On the other hand, omnidirectional antenna is another object to be tested in anechoic chambers. However, it will be difficult to introduce such a PIM source as a part of rotatable parasitic element without degrading the original antenna characteristics. In this paper, an elliptical disk monopole antenna is chosen as omnidirectional antenna because of its broad band characteristics [2]. Several methods to incorporate a PIM source into the antenna are evaluated by experiment. As PIM source, electrically small dipole and small loop with diodes are used. The targets of this study is the mechanical controllable arrangement of PIM source with no electrical contact, and realization of controlling the maximum PIM around -80dBm for 43dBm/tone excitation which can be reducible down to the self-PIM of antenna itself. It is also important to have linearity in log scale against excitation power. As a result, we confirm the validity of the small dipole with diode and the effectiveness of its slanting arrangement for controlling PIM generation.