Abstract: An apparatus transmits RF signals in two widely separated frequency bands. The RF signals in the two frequency bands have the same modulated bandwidth. The apparatus utilizes substantially the same radio communication apparatus structure as in a radio communication apparatus designed for only one frequency band. RF signals for one frequency band are obtained when a first frequency multiplier is connected, generating RF signals by multiplying VCO signals from a VCO by a factor k. The RF signals for the other frequency band are obtained from the VCO when the first frequency multiplier is not connected. When the first frequency multiplier is connected, the modulated bandwidth of the VCO signals will multiplied by the factor k. This is compensated in a phase locked loop by connecting a second frequency multiplier, having the same multiplication factor k, at the same time as the first multiplier is connected.

Abstract: The present invention relates to a multiple band receiver comprised in a mobile terminal. The receiver is able to receive radio signals in an upper frequency band (FB.sub.U) and a lower frequency band (FB.sub.L). The multiple band receiver comprises an antenna (ANT), a converting receiver part (R1), a heterodyne receiver part (R2) and a voltage controlled oscillator (VCO). The voltage controlled oscillator generates local oscillator frequencies (f.sub.LO) substantially equal to the frequency shift between the two frequency bands. Radio signals (f.sub.RF) in the upper frequency band (FB.sub.U) are converted in the converting receiver part (R1) to substantially the lower frequency band (FB.sub.L) by mixing with a local oscillator frequency (f.sub.LO). The converted signal is mixed in the heterodyne receiver part (R2) with the same local oscillator frequency (f.sub.LO) thus generating the same first intermediate frequency (f.sub.IF1) as for signals in the upper frequency band.