Patent ID: 6943731

Claim:
A slot fed microstrip patch antenna, comprising: an electrically conducting ground plane, said ground plane having at least one slot; a feed line for transferring signal energy to or from said slot, said feed line including a stub which extends beyond said slot; a first dielectric layer disposed between said feed line and said ground plane, said first dielectric layer having a first set of dielectric properties including a first relative permittivity over a first region, and at least a second region of said first dielectric layer having a second set of dielectric properties, said second set of dielectric properties providing a higher relative permittivity as compared to said first relative permittivity, wherein said stub is disposed on said second region, and at least one patch radiator and a second dielectric layer, said second dielectric layer disposed between said ground plane and said patch radiator, wherein said second dielectric layer includes a third region providing a third set of dielectric properties including a third relative permittivity, and at least a fourth region including a fourth set of dielectric properties, said fourth set of dielectric properties including a higher relative permittivity as compared to said third relative permittivity.