Patent ID: 6229489
Filing Date: 2001-05-08
Classification: H01Q

Abstract:
A radiotelephone having a retractable dual-band antenna configured to radiate in a selected one of separate first and second frequency bands, wherein said second frequency band is greater than said first frequency band, said radiotelephone comprising:a radiotelephone housing;a transceiver disposed within said radiotelephone housing;an elongated antenna element movably mounted within said housing and extendible from the housing so as to have an extended position and a retracted position, said elongated antenna element electrically coupled with said transceiver;a top load element that extends from the radiotelephone housing when the elongated antenna element is in the extended position and when the elongated antenna element is in the retracted position, the elongated antenna element being disposed between the top load element and the radiotelephone housing when the elongated antenna element is in the extended position,a trap positioned between and electrically connected to said elongated antenna element and said top load element such that said trap has no overlap with said top load element and is disposed within said housing when the elongated antenna element is in the retracted position, said trap configured to have a first impedance at said first frequency and a second impedance, greater than said first impedance, at said second frequency.