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This is independent of Z o , as long as Z o is not perfectly resonant at this requency. Thus, for these values of frequency the network acts like a current transformer. 1615/4] Fig. 4 'Pi' circuit with arbitrary load impedance The circuit of Fig. 3 is not suitable as a current transformer. However, the 'pi' circuit of Fig. 4 acts as a current transformer at the frequency 1 L 2)C] (13) In summary, it has been shown that an arbitrary two-port network will operate as a voltage transformer at those frequencies for which g 22 = 0 and as a current transformer at those frequencies for which h 22 = 0. These results are independent of load provided that, at the frequencies of interest, Z o =£ 0 and Z o ^ oo, respectively.

The primary aim of this paper is to provide an overview of wireless communication fundamentals, and the approach used considers them within the context of the following four categories -radio propagation, wireless air interface, advanced antenna systems and interference effects. In addition to this, a representative set of mobile systems are compared to show that their differences are primarily due to them having different combinations of channel transport, modulation scheme and regulatory constraints on transmit power, channel bandwidth, operating frequency and channel duplex.