| 摘要 |
THE PRESENT INVENTION RELATES TO A POWER AMPLIFIER DEVICE (10), SWITCHABLE FOR AT LEAST TWO SEPARATE BASIC FREQUENCY BANDS, FOR RADIO FREQUENCY SIGNALS WITH EFFECTIVE SUPPRESSION OF HARMONICS, WHERE HARMONICS, CORRESPONDING TO A FIRST BASIC FREQUENCY BAND, CAN BE PERMITTED TO OVERLAP THE FREQUENCY RANGE OF AT LEAST ONE SECOND BASIC FREQUENCY BAND. THE POWER AMPLIFIER DEVICE (10) COMPRISES A POWER AMPLIFIER (1) AND AN IMPEDANCE MATCHING CIRCUIT (2), SWITCHABLE BY MEANS OF A PIN-DIODE, WHICH PROVIDES A LOAD IMPEDANCE ADAPTED TO EACH INDIVIDUAL BASIC FREQUENCY BAND. FURTHERMORE, THE POWER AMPLIFIER DEVICE COMPRISES A FILTER DEVICE (3) COMPRISING A FIXED LOW-PASS FILTER (3B) AND A SWITCHABLE FILTER (3B) ACTING AS AN ENGAGEABLE AND DISENGAGEABLE NOTCH FILTER, WHICH COMPRISES AT LEAST ONE REVERSIBLE PIN-DIODE. THIS SWITCHABLE FILTER (3A) ALLOWS TO PASS, IN A FIRST MODE, SIGNALS IN THE FIRST BASIC FREQUENCY BAND AND SUPPRESSES AT THE SAME TIME AT LEAST ONE ORDER OF HARMONICS CORRESPONDING TO THIS BASIC FREQUENCY BAND. IN A SECOND MODE, THE SECOND BASIC FREQUENCY BAND IS TRANSMITTED WITHOUT APPRECIABLE LOSSES, AND HARMONICS ARE SUPPRESSED BY THE FIXED LOW-PASS FILTER (3A).(FIG. 2) |
