Patent ID: 7620376
Filing Date: 2009-11-17
Classification: H01P,H04B

Abstract:
1. A transmitter comprising a channel front-end circuit and a transmitting element, the transmitting element having a signal source, a signal output terminal coupled to the channel front-end circuit, and a ninety degree phase shifter coupled between the signal source and the signal output terminal, wherein the ninety degree phase shifter is a part of a sensor element, the sensor element being disposed to form at least one of the following: an indication of a level of a signal delivered from the transmitting element to the channel front-end circuit and an indication of an impedance mismatch on a signal path from the signal source to the channel front-end circuit, and the ninety degree phase shifter is also at least one of the following: an impedance transformer disposed to perform impedance matching on the signal path from the signal source to the channel front-end circuit, a band-limiting filter disposed to attenuate frequency components of the an output signal of the signal source that are outside a predetermined frequency band, and a part of a throw-over switch disposed to increase an impedance of the signal output terminal of the transmitting element.