초록 ▼

The invention relates to an antenna for receiving and modulating transmitted signals having a very low power density on the order of below 1 watt per meter squared, at a selected center frequency above 2,000 MHz. The antenna uses a folded planar dipole section having two separated oppositely dispose

The invention relates to an antenna for receiving and modulating transmitted signals having a very low power density on the order of below 1 watt per meter squared, at a selected center frequency above 2,000 MHz. The antenna uses a folded planar dipole section having two separated oppositely disposed U-shape elements, each of said elements having a pair of ends. A capacitor is series-coupled between two of the oppositely disposed ends of the elements, and a diode having a high impedance at the selected center frequency is series-coupled between the other two oppositely disposed ends of the U-shape elements. A metallic backplane is mounted parallel to the planar folded dipole section and spaced from the dipole section a predetermined distance selected to reduce the antenna impedance. The impedance of the diode, the shape of the folded planar diode section and the predetermined amount of spacing of the backplane from the planar folded dipole section are all selected to increase the d.c. power output of the antenna.

대표청구항 ▼

An antenna for receiving and modulating transmitted signals having very low power density on the order of below about 1 watt per meter squared, at a selected center frequency above 2000 MHz, comprising: a folded planar dipole section having two separated oppositely disposed U-shaped elements, each o

An antenna for receiving and modulating transmitted signals having very low power density on the order of below about 1 watt per meter squared, at a selected center frequency above 2000 MHz, comprising: a folded planar dipole section having two separated oppositely disposed U-shaped elements, each of said elements having a pair of ends; a capacitor series coupled between two oppositely disposed ends of said two elements; a diode having a high impedance at said selected center frequency, series coupled between the other two oppositely disposed ends of said two elements; a metallic backplane mounted parallel to said planar folded dipole section and spaced therefrom by a predetermined distance selected to reduce the antenna impedance, the impedance of said diode, the shape of said folded planar dipole section and the predetermined amount of spacing of said backplane from said planar folded dipole section all being selected to increase the d.c. power output of the antenna.