摘要:
Die Erfindung betrifft einen Hochfrequenz-Verstärker-Einheit (100, 200, 300) umfassend mehrere Verstärkermodule (10,10') zum Verstärken von Hochfrequenzeingangssignalen zu Hochfrequenzausgangssignalen und einen Koaxial-Combiner (102, 202, 302) mit einem Außenleiter (104, 204, 304) und einem hierzu koaxial angeordneten Innenleiter (106, 206, 306) zum Zusammenführen der Hochfrequenzausgangssignale der Verstärkermodule (10, 10'), wobei die Verstärkermodule (10, 10') außenseitig auf dem Außenleiter (104, 204, 304) des Koaxial-Combiners (102, 202, 302) angeordnet sind und die Verstärkermodule (10, 10') zur Übertragung der Hochfrequenzausgangssignale auf den Koaxial-Combiner (102, 202, 302) mit dem koaxialen Innenleiter (106, 206, 306) des Koaxial-Combiners (102, 202, 302) verbunden sind. Die Erfindung betrifft zudem ein Verstärker-System.
摘要:
Method and apparatus for transfer of signals from multiple antennas down to baseband over a common radio frequency (RF) chain. Antenna selection having greater flexibility and applicability to both uplink and downlink wherein priority is given to the antenna receiving a better quality signal. Measurements are taken during each time slot to determine the weighting to be given to the antenna with the better quality signal. Techniques and apparatus are provided to take measurements over a range of intervals from time slots to single symbols, for example, to select the best signal the techniques described herein may be used individual, and in some cases are combined to receive additional benefits in efficiency.
摘要:
The invention concerns a pulse generator comprising a microwave source (T, 60) which delivers a pulse signal in a compression resonant cavity (15) equipped with a switching device (21) for opening and closing it. The pulse signal is stored in the compression resonant cavity (15) which is then enclosed to be compressed therein before being delivered with higher amplitude and a width less than when the compression resonant cavity (15) is open. The microwave frequency source (T) is of the amplifier type with instantaneous band pass including the resonance frequency of the compression resonant cavity. It receives in input an input signal to be amplified which is derived from the compression resonant cavity (15). The invention is applicable to high power pulse generator.
摘要:
The invention concerns a pulse generator comprising a microwave source (T, 60) which delivers a pulse signal in a compression resonant cavity (15) equipped with a switching device (21) for opening and closing it. The pulse signal is stored in the compression resonant cavity (15) which is then enclosed to be compressed therein before being delivered with higher amplitude and a width less than when the compression resonant cavity (15) is open. The microwave frequency source (T) is of the amplifier type with instantaneous band pass including the resonance frequency of the compression resonant cavity. It receives in input an input signal to be amplified which is derived from the compression resonant cavity (15). The invention is applicable to high power pulse generator.
摘要:
The invention relates to a dielectric resonator oscillator, comprising a dielectric resonator (4) which is contained in a resonant cavity (2) for generating a signal that oscillates at a predetermined central frequency. The dimensions of the resonator and the conditions at the boundaries of the cavity determine the resonance frequency of the resonator. The invention also comprises means (17, 18, 19) for modifying the distribution of the electromagnetic fields in the cavity according to acoustic pressure waves, said means being sensitive to said acoustic pressure waves. The invention also relates to a voice control device which is provided with an inventive oscillator. The invention is particularly suitable for remote voice control devices for controlling household equipment.
摘要:
The invention is mainly related to the use of power amplifiers and modulators in e.g. radio communications systems, and more particularly to the use of switching-mode power amplifiers at high carrier frequencies. A new radio transmitter architecture is provided that is different from that of the conventional radio transmitters that uses an AC carrier signal of constant amplitude and phase. To realise this new radio transmitter, a novel device is proposed based on the following features: the use of switchable bandpass filters to implement digital modulation directly on the AC, RF frequency, carrier wave. This direct modulation may eliminate some undesired non-linear effects, such as intermodulation products which may appear in a conventional RF power amplifier. A signal source is used to control an RF switch realised as e.g. a semiconductor or a Josephson junction, among others, depending on the modulation frequency. A low-pass, or band-pass filter is provided. This filter can be switched, thereby amplitude modulating the AC voltage source as it passes through the filter. A preferred embodiment consists of a planar microstrip element having a patterned electrically conducting layer. The patterned layer forms a transmission or propagation path for the signal, the path having a central path with lateral strips separated by windows from the central path. These lateral paths have regions which allow them to be controlled by the control signal, thereby performing the switching function.
摘要:
In a balanced modulator, a local oscillator frequency signal is transmitted through a serial connection of the primary side conductive patterns (1p and 2p) of a first coupler (1) and a second coupler (2), wherein the two couplers (1 and 2) are connected in an opposing direction. A first output terminal of the secondary side conductive pattern (1s) of the first coupler (1) is grounded through a first effective grounding pattern (4), and a first output terminal of the secondary side conductive pattern (2s) of the second coupler (2) is grounded through a second effective grounding pattern (5). The output voltage at a second output terminal of the secondary side conductive pattern (1s) of the first coupler (1) is impressed to a terminal of a first diode (9). The output voltage at a second output terminal of the secondary side conductive pattern (2s) of the second coupler (2) is impressed to a terminal of a second diode (10). A compensation pattern (3) is inserted between the serial connection of the primary side conductive patterns (1p and 2p) for compensating an unbalance caused by the two effective grounding patterns (4 and 5).