초록 ▼

An antenna structure has a radiating element and a ground plane. The ground plane has a central region relatively closely spaced apart from the radiating element and a peripheral region extending away from the central region. At least the peripheral region of the ground plane has a sheet resistivity

An antenna structure has a radiating element and a ground plane. The ground plane has a central region relatively closely spaced apart from the radiating element and a peripheral region extending away from the central region. At least the peripheral region of the ground plane has a sheet resistivity that increases as radial distance from the central region increases. Though physically small, the ground plane simulates an infinite ground plane, and the antenna structure reduces multipath signals caused by reflection from the earth.

대표청구항 ▼

An antenna structure comprising: a radiating element for receiving broadcast signals directly and, because of reflection of the signals, also indirectly with a time delay, and a ground plane for said radiating element having a central region relatively closely spaced apart from said radiating elemen

An antenna structure comprising: a radiating element for receiving broadcast signals directly and, because of reflection of the signals, also indirectly with a time delay, and a ground plane for said radiating element having a central region relatively closely spaced apart from said radiating element and a peripheral region extending away from said central region, at least the peripheral region of said ground plane having a sheet resistivity that increases as radial distance from said central region increases; whereby the signals received indirectly because of reflection are attenuated.