Abstract: The omnidirectional ultra-wideband antenna is a variant on a monocone antenna, particularly including a supplemental radiating element. The omnidirectional ultra-wideband antenna includes an electrically conductive conical surface having a vertex end and a base end, and a supplemental radiating element having a first portion and a second portion. The first portion extends from the base end of the electrically conductive conical surface, the first portion being positioned between the base end of the electrically conductive conical surface and the second portion. The vertex end of the electrically conductive conical surface is positioned adjacent to, and spaced apart from, a first surface of a ground plane plate. At least one electrically conductive rod is provided, a first end of the rod being secured to the second portion, and a second end of each rod being mounted on the first surface of the ground plane plate.

Abstract: The omnidirectional multiband antenna is a variant on a monocone antenna, particularly including a corrugated extending surface for lowering the low frequency cutoff of the monocone antenna. The omnidirectional multiband antenna includes an electrically conductive conical surface, having a vertex end and a base end, and at least one electrically conductive annular member mounted on the base end. The at least one electrically conductive annular member is formed from a plurality of stacked segments and has a corrugated exterior surface. The vertex end of the electrically conductive conical surface is positioned adjacent to, and spaced apart from, a first surface of a ground plane plate. A plurality of cylindrical rods is provided, a first end of each rod being secured to the at least one electrically conductive annular member, and a second end of each rod being mounted on the first surface of the ground plane plate.

Abstract: A ripple-eliminating power converter includes a first voltage converter configured to output a first voltage by stepping up or down a DC voltage supplied from a battery cell; a second voltage converter configured to receive the first voltage outputted from the first voltage converter and output a second voltage by stepping up or down the first voltage; and a ripple-eliminating capacitor disposed between the first voltage converter and the second voltage converter to transfer a DC component of the first voltage to the second voltage converter by eliminating an AC component included in the first voltage.

Abstract: A power converter for eliminating ripples comprises a first voltage converter for outputting a first voltage by means of a step-up or step-down of the DC voltage received from a battery or a solar cell; a second voltage converter, to which the first voltage outputted from the first voltage converter is inputted, for outputting a second voltage by means of a step-up or step-down of the first voltage; a ripple-eliminating capacitor positioned between the first voltage converter and the second voltage converter, for transmitting just a DC component of the first voltage by eliminating an AC component included in the first voltage.