Patent ID: 6429821
Filing Date: 2002-08-06
Classification: H01Q

Abstract:
An antenna operable over a predetermined range of frequency, comprising:a transmission line; a transformer network connected to one end of said transmission line; a linear radiator which includes within its length at least one inductor-resistor network, one end of said linear radiator connected to an opposite end of said transformer network, said at least one inductor-resistor network changing the effective electrical length of said linear radiator such that as the frequency of operation changes, the current distribution along said linear radiator, above and below said inductor-resistor network, changes in a corresponding manner, wherein the antenna has an instantaneous bandwidth of at least 58 MHz up to about 482 MHz in an overall bandwidth between 30 MHz and 512 MHz, wherein said at least one inductor-resistor network is an inductor and a resistor connected in parallel; and a second inductor-resistor network serially connected within said linear radiator, wherein said second inductor-resistor network is a second inductor and a second resistor connected in parallel, and wherein both said inductor-resistor networks function to reduce the current thereabove, such that as the frequency of operation increases, the electrical height of the antenna decreases.