16 of fig1 15 the physical antenna dimensions for the antenna 16 generating the field of fig1 will be the same as fig1 with a simple substitution of the inner and outer radiuses the sole table below provides an overview of the embodiments and the drawings table______________________________________drawing preferredelement generic term or specific term alternate terms______________________________________10 interrogator interrogator reader12 transponder transponder responder14 14a 14b tire16 closed slot circular slot antenna rectangular slot antenna interrogator antenna lf antenna74 wire antenna wire76 outer loop outer magnetic loop78 inner loop inner magnetic loop80 first point82 second point84 third point86 fourth point88 fifth point90 sixth point92 outer loop outer virtual magnetic loop94 inner loop inner virtual magnetic loop116 prior art single loop antenna rectangular antenna216 prior art double loop antenna balanced antenna______________________________________ a few preferred embodiments have been described in detail hereinabove it is to be understood that the scope of the invention also comprehends embodiments different from those described yet within the scope of the claims for example 34 microcomputer 34 in some contexts is used to mean that microcomputer requires a memory and 34 microprocessor 34 does not the usage herein is that these terms can also be synonymous and refer to equivalent things the phrase 34 processing circuitry 34 or 34 control circuitry 34 comprehends asics application specific integrated circuits pal programmable array logic plas programmable.