Patent ID: 6975281

Claim:
A reduced size dielectric loaded spiral antenna comprising: (a) a dielectric substrate; (b) a spiral antenna having first and second antenna arms for radiating microwave energy, said spiral antenna being mounted on said dielectric substrate; (c) a balun having one end thereof being adapted to receive a fifty ohm cable and an opposite end thereof having first and second antenna signal arm inputs, the first antenna signal arm input of said balun being connected to an inner end of said first antenna arm and the second antenna signal arm input of said balun being connected to an inner end of said second antenna arm; (d) a first plurality of stacked dielectric layers having dielectric constants in a range from about 4.0 to about 20.0, said first plurality of stacked dielectric layers being disposed on one side of said dielectric substrate above said spiral antenna; (e) a second plurality of stacked dielectric layers having dielectric constants in a range from about 4.0 to about 20.0, said second plurality of stacked dielectric layers being disposed on an opposite side of said dielectric substrate below said spiral antenna, wherein said first plurality of stacked dielectric layers, and said second plurality of stacked dielectric layers provide for a size reduction of said spiral antenna; and (f) said first plurality of stacked dielectric layers, and said second plurality of stacked dielectric layers providing for a size reduction of said balun and an impedance match between said fifty ohm cable and the first and second antenna arms of said spiral antenna.