| 摘要 |
A planar two-arm Archimedean spiral antenna has a design of semi-lumped element circuit incorporated in each arm to form serial-inductance, shunt-capacitance, ladder-type Tchebyscheff low pass filters. Energy travelling outward from the center is mostly radiated when a ring of a certain size is reached and whatever remaining unradiated energy is attenuated without giving rise to undesired higher order radiation.
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