Patent ID: 7710338
Filing Date: 2010-05-04
Classification: H01Q

Abstract:
1. A slot antenna apparatus comprising: a grounding conductor, having an outer edge including a first portion facing a radiation direction, and a second portion other than the first portion; a one-end-opened slot formed in the grounding conductor along the radiation direction such that an open end is provided at a center of the first portion of the outer edge of the grounding conductor; a first feed line including a strip conductor close to the grounding conductor and intersecting with the slot at at least a part thereof to feed radio-frequency signals to the slot; a second feed line including a strip conductor close to the grounding conductor and connected to an external circuit; and a signal processing circuit connected between the first and second feed lines, and connected to the grounding conductor, the signal processing circuit including active elements and processing radio-frequency signals to be transmitted and received, wherein the grounding conductor is configured to be symmetric about an axis parallel to the radiation direction and passing through the slot, and the grounding conductor is provided with a grounding terminal on the axis of symmetry of the grounding conductor, at the second portion of the outer edge of the grounding conductor, and the grounding terminal is to be connected to a ground of the external circuit, and wherein, as a result of providing the grounding terminal on the axis of symmetry of the grounding conductor, the grounding terminal has a higher input and output impedance than an impedance in an unbalanced mode of the grounding conductor.