Title :
Near-Field Amplitude Measurement of Passive Intermodulation in Antennas
Author :
Hienonen, S. ; Golikov, V. ; Möttönen, V.S. ; Vainikainen, P. ; Räisänen, A.V.
Author_Institution :
Radio Laboratory, Helsinki University of Technology, P.O.Box 3000, FIN-02015 HUT, Finland. Tel: +358 9 4512936, Fax: +358 9 4512152, E-mail: sami.hienonen@hut.fi
Abstract :
Near-field measurement method of passive intermodulation (PIM) in antennas is introduced. Scanning with a near-field probe inside an antenna structure is proposed to be used to localise passive intermodulation sources and, thus, to speed up e.g. antenna design. For the amplitude measurement a mechanical scanner and a low-PIM probe are needed in addition to a PIM analyser. Two demonstration measurements with a matched microstrip line and stacked patch antenna incorporating a diode were made at 910 MHz. The diode caused a 21 dB peak in the microstrip line and a 16 dB peak in the antenna measurement.
Keywords :
Antenna measurements; Base stations; Diodes; Distortion measurement; Intermodulation distortion; Magnetic field measurement; Microstrip antennas; Nonlinear distortion; Probes; Receiving antennas;
Conference_Titel :
Microwave Conference, 2001. 31st European
Conference_Location :
London, England
DOI :
10.1109/EUMA.2001.339019
