Patent ID: 8816936

Claim:
An antenna, comprising: a first conductive plane; a second conductive plane disposed in parallel with the first conductive plane; a feed line applying a high frequency signal between the first conductive plane and the second conductive plane; and at least one shunt which is aligned in the second conductive plane and which comprises a transmission line comprising an open end aligned in a plane above or below the second conductive plane and a conductive via electrically connecting another end of the transmission line to the first conductive plane such that the transmission line forms an open stub, wherein the second conductive plate undergoes a resonance at a frequency f satisfying an inequality of Im(Y(f))≧0 to emit an electromagnetic wave into air in accordance with an equation of: Y ⁡ ( f ) = 1 ⅈ ( 2 ⁢ π ⁢ ⁢ fL via - Z 0 tan ( 2 ⁢ π ⁢ ⁢ f ⁢ ɛ eff c 0 ⁢ d ) ) + ⅈ2π ⁢ ⁢ fC PPW wherein, f: frequency L via : inductance of the conductor via C PPW : capacitance formed between the first conductive plane and the second conductive plane in each unit cell Z 0 : characteristic impedance of the transmission line d: length of the transmission line ∈ eff : effective dielectric constant of the transmission line c 0 : speed of light in vacuum.