Patent ID: 7242361

Claim:
An antenna structure for transmitting and/or receiving radio waves comprising: a symmetrical radiator element with first and second connecting terminals, said radiator element being tuned to a useful frequency, at least one conductor structure connected in parallel with the radiator element, said conductor structure having an open-circuited first line element coupled to the first connecting terminal, and an open-circuited second line element coupled to the second connecting terminal, wherein the first and second line elements are of the same length essentially corresponding to the integral multiple of a quarter of a wavelength corresponding to a blocking frequency, and the first and the second line elements arranged in a manner running parallel to one another, and at least one second conductor structure connected in parallel with the radiator element, said second conductor structure having an open-circuited third line element coupled to the first connecting terminal, and an open-circuited fourth line element coupled to the second connecting terminal, the third and fourth line elements being of the same length essentially corresponding to the integral multiple of a quarter of a wavelength corresponding to a second blocking frequency different from the blocking frequency.