Design of Antennas for Handheld DVB-H ... - Lunds tekniska högskola

Figure 4.15. Wire loop antenna return loss graph.
The good result from the measurement with the loop antenna made by thin wire
did it interesting to make a loop antenna by copper tape. So the last loop antenna
that was designed is the one in figure 4.16. The antenna is controlled by two
variable capacitance diodes that can be varied between 2.6-6.7 pF, the variable
capacitance diodes used has part number SMW1763. The return loss graph for the
loop antenna made by copper tape is presented in figure 4.17. The reason why this
is the most interesting design is that it is the most likely loop antenna to realize in
a real cell phone, because it is very thin and can be made by flex film or by PCB.
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