Patent ID: 7133652
Filing Date: 2006-11-07
Classification: H04B

Abstract:
1. Circuit arrangement for compensation of attenuation in an antenna lead ( 21 , 21 ′) for a mobile wireless device, which has at least one circuit component (A), which is suitable for operation in a first frequency band with two different frequency ranges (a, b) of HF signals for transmitting and receiving, and for this purpose comprises at least one signal pathway ( 1 ) (transmitting pathway) with a power amplifier ( 2 ) which is designed as broadband and this pathway is configured for amplifying HF signals to be transmitted; one signal pathway ( 3 ) (receiving pathway) with a low-noise amplifier ( 4 ), which is designed as broadband and this pathway is configured for amplifying HF signals which are received; two filtering and reverse-switching units ( 5 , 6 ), each with a frequency filter ( 7 , 9 ) and a signal-reversing switch ( 8 , 10 ) on the input and output sides of the two signal pathways ( 1 , 3 ); as well as a detection and control unit ( 11 ) controlling the signal-reversing switches ( 8 , 10 ), whereby, corresponding to possible different operating states given beforehand and automatically assumed by the mobile wireless device and starting from a base state of circuit component A of the circuit arrangement, the transmission of the HF signals is possible either in the higher or the lower of both frequency ranges (a, b) located in the frequency band processed by circuit component A, by conducting the HF signals that are received via the circuit component (A) in the base state via signal pathway ( 3 ) with low-noise amplifier ( 4 ), independently of whether they belong to frequency range (a, b) within the frequency band processed by circuit component (A) and conditioned by the mobile wireless device and an HF signal that is transmitted by it, by means of the detection and control unit ( 11 ) that establishes the presence of the transmission signal, the signal-reversing switches ( 8 , 10 ) are controlled in such a way via control connections ( 12 , 13 ) that HF signals with a frequency within the frequency range (a) or (b) used in the scope of the actually established telecommunications connection for transmission are conducted over power amplifier ( 2 ) of the circuit component (A).