Arrangement and method for reducing losses in radio transmitter

Details Arrangement and method for reducing losses in radio transmitter Arrangement and method for reducing losses in radio transmitter

2007-01-30

2007-01-30

Urban, Edward F. (Department: 2618)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S277100, C455S134000, C455S135000, C455S022000, C333S101000

Reexamination Certificate

active

10027089

ABSTRACT:
The invention relates to an arrangement and method for reducing losses at the transmitting end of a radio apparatus, especially one that operates in more than one system. An interfering transmitter is provided with two antenna filters one of which is a low-pass-type filter and the other a band-pass filter. The filter (BPF) with a higher stop-band attenuation is used only when the receiver (330, LNA) susceptible to interference is in receive state. At other times, the filter (LPF) with a lower stop-band attenuation and, hence, a lower pass-band attenuation, is used as the transmitting-end filter. Advantageously the selection between the different filters is realized using MEMS-type switches (SW31to SW34). The invention minimizes the mean current consumption of the radio-frequency power amplifier (PA) of the said radio apparatus. The space required by and the production costs of the arrangement according to the invention are relatively small.

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