Patent ID: 8111197

Claim:
An antenna apparatus, comprising: a multi-layer substrate having at least two substrates in a stacking manner and having a first through hole passing through at least one of the substrates; an amplifying circuit formed on one face of the multi-layer substrate; a ground pattern which is made of a metal film and which is formed between two adjacent substrates of the multi-layer substrate; an antenna pattern which is made of a metal film and which is formed on the other face of the multi-layer substrate; a first comb electrode formed around the antenna pattern on the other face of the multi-layer substrate, the first comb electrode, which has comb teeth and is made of a metallic film, being electrically connected to the antenna pattern; and a second comb electrode formed around the antenna pattern on the other face of the multi-layer substrate, the second comb electrode, which has comb teeth, being electrically connected to the ground pattern through the first through hole, wherein the comb teeth of the first comb electrode and the comb teeth of the second comb electrode are spaced from one another at predetermined intervals in a staggered manner.