Development of Circularly Polarized Microstrip ... - CEReS - åè大å¦
Development of Circularly Polarized Microstrip ... - CEReS - åè大å¦
Development of Circularly Polarized Microstrip ... - CEReS - åè大å¦
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Figure 3.2: Various shapes <strong>of</strong> microstrip antennas (Girish and Ray, 2003).<br />
dielectric constant (2.2 ≤ ε r ≤12) and dissipation factor (loss tan δ). As ε r gets higher in value<br />
the antenna size gets smaller. Substrates that are thick with low dielectric constant are preferable<br />
for enhancing efficiency, bandwidth and radiation in space. For a good overall efficiency<br />
and a high circuit performance, the loss tan δ must be as low as possible. (typically loss tan<br />
δ