Abstract:
The invention relates to an antenna (100) comprising at least one antenna element (110) for transmitting and/or receiving radio frequency, RF, signals, wherein said antenna (100) comprises at least one electromechanic actuator (120) for moving said at least one antenna element (110) with respect to a further component of said antenna (100).
Abstract:
Embodiments comprise a circuit 100 and a method for a circuit 100 for mixing an electrical input signal 22 with an optical input signal 24 to obtain an electrical output signal 26. The circuit 100 comprises a phototransistor 10 with an input 32 for the electrical input signal 22, an input 34 for the optical input signal 24, and an output 36 for the electrical output signal 26. The circuit 100 is further adapted to operate the phototransistor 10 in an overdrive state such that the output electrical signal 26 comprises a clipped product signal of the electrical input signal 22 and the optical input signal 24.
Abstract:
The invention relates to a radio head device (100), for receiving an input signal from an external signal processing unit (12) and for upconverting said input signal to a radio frequency, RF, range, wherein said radio head device (100) comprises: - an input interface (110) that is configured to receive a digitally modulated input signal (Di) from said external signal processing unit (12) and to transform said digitally modulated input signal (Di) into an analog input signal (Ai), and - at least two upconversion branches (120_1, 120_2, 120_3), wherein each upconversion branch (120_1, 120_2, 120_3) is configured to filter at least one predetermined frequency subband of said analog input signal (Ai) to obtain a subband input signal (si1 si2, si3), and to transform said subband input signal (si1, si2, si3) into a predetermined RF range to obtain a respective RF subband signal (si1_RF, si2_RF, si3_RF).
Abstract:
A method for providing an amplified RF signal, with the steps of - analysing the spectral components, namely the amplitudes (C 1 ...C N ) and the phases (Φ 1 ...Φ N ) at different frequencies (f 1 ...f N ), of a signal to be amplified, - applying a supply voltage to coupling elements (3) of a coupling array (1), wherein the coupling array (1) comprises a plurality of nano-sized coupling elements (3), and wherein the coupling elements (3) are grouped into a number N of sub-arrays (SA 1 ...SA N ), with each sub-array (SA 1 ... SA N ) exhibiting • a specific resonance frequency (rf 1 ...rf N ) corresponding to a frequency component of the signal to be amplified and • a specific attenuation
of a mechanical self oscillation of its coupling elements (3), - stimulating mechanical self-oscillations of the coupling elements (3) of the sub-arrays (SA 1 ...SA N ) in dependence of the spectral components of the signal to be amplified, is characterized in that the amplification gain is at least partially regulated by switching the supply voltage between different dc voltage levels. The invention provides a method for providing an amplified RF signal with reduced spectral distortions and with a better transmit power control over a wide range of amplification gains.