Low Cost Ku band transmitter
AssigneeHughes Aircraft Company
InventorJonathon Cheah
Life of this patent
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Abstract
A Ku band frequency signal transmitter using a minimum of Ku band signal processing components is shown. Inexpensive generation of Ku band signals is provided by frequency multiplying high power, lower frequency signals to a final Ku band signal frequency. The transmitter generates an intermediate frequency signal from a baseband modulated signal and a high frequency local oscillator signal. The baseband signal is FSK modulated and has a constant envelope. A dividing stage reduces the baseband frequency signal to improve the spectral purity of the final Ku band output signal.
Claims11
A transmitter for producing a range of high power high frequency modulated signals comprising:
- a local oscillator for providing a local oscillator signal having a selectable frequency greater than the frequency bandwidth of said high frequency modulated signals;
- a digital data synthesizer modulator for providing a modulated constant envelope signal in response to a data signal and a clock signal;
- a heterodyne circuit connected to receive a signal from said digital data synthesizer modulator and said local oscillator signal from said local oscillator, for producing a frequency converted, intermediate frequency signal;
- and,
- a frequency multiplier for multiplying said converted intermediate frequency signal to said high frequency modulated signals.
A method for generating high power high frequency modulated signals comprising the steps of:
- generating a frequency shift keyed baseband signal from an input data signal and a clock signal;
- frequency dividing said frequency shift keyed baseband signal for reducing spurious artifact signals contained in said frequency shift keyed baseband signal;
- frequency converting said frequency divided baseband signal to an intermediate frequency signal;
- and,
- frequency multiplying said intermediate frequency signal to a final transmit signal frequency.
Dependencies are inferred from the claim text.