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From: Sezai Komur
Date: 08 Apr 2002
Time: 23:06:18
Remote Name: 134.7.134.15
I am a university student in my final year of study. For my final year project I have to design an antenna system for a RF-tag system.
The effective transmission range is short, around 1 to 2 metres.
the operating frequency is 13.56Mhz with wavelength approxiametely 22metres
I need to design the base-station to be compact, so my project supervisor suggests I design it as a ferrite loop/solenoid antenna.
I want to know how do I determine the gauge of wire to use, the radius of the loops, the number of loops, the length of the antenna ie. the general dimensions of the antenna, to maximise efficiency and range of the antenna.
I have researched various antenna books, but haven't been able to locate the methods to solve this problem!
The RF-tags are also only scanned coming from one direction, so the scan area is reduced by half, ie. 180 degrees horizontally. To increase transmission range my supervisor suggests I use an array of 2 or more elements. I have decided a simple cardiod radiation pattern will suffice.
For the array I need to design a Phase Shifter, my supervisor suggests using a simple LC circuit. The signal is 13.56Mhz and is narrowband, the circuit needs to provide equal passing of frequencies within this operating range.
Any help or advice relating to resources, web pages, books. or just general advice would be greatly appreciated.
I have had little success in the first part of my project, ie. determining the dimensions/construction of the solenoid antenna. I am desperate for any help.
I can also be contacted by email on: komur@ses.curtin.edu.au
thanks!