Patent ID: 6407721
Filing Date: 2002-06-18
Classification: H01Q

Abstract:
A super thin, cavity free spiral antenna, comprising:a radiating element comprising a first spiral arm and a second spiral arm formed on a front surface of a first dielectric substrate; a resonant ground plane formed on a back surface of the first dielectric substrate, the resonant ground plane comprising: a second dielectric substrate having a front surface adjacent the back surface of the first dielectric substrate; a third spiral arm and a fourth spiral arm formed on the front surface of the second dielectric substrate, the third spiral arm and the fourth spiral arm being commonly aligned with the first spiral arm and the second spiral arm, respectively, on opposite sides of the first dielectric substrate; a fifth spiral arm formed on a back surface of the second dielectric substrate, the fifth spiral arm being generally commonly aligned with the third spiral arm and the fourth spiral arm, on opposite sides of the second dielectric substrate; and at least one impedance element coupling the third spiral arm and the fourth spiral arm to the fifth spiral arm to form a resonant circuit; and a feedline configuration coupled to the first and second spiral arms for transmitting/receiving a high frequency signal via the antenna.