The invention relates to a design method of a
microwave wideband frequency combiner applied to the field of
signal interference. According to the method, a DDS (Direct Digital Synthesis) + PLL (
Phase Locked Loop) + DAFS (Direct Analog
Frequency Synthesis)
hybrid frequency synthesis mode is utilized to synthesize a 0.1-18GHz ultra
wide band microwave frequency, wherein the
frequency band comprises working frequencies of most of
microwave signals, can meet the frequency requirement for interfering with most of the
microwave signals and especially can be applied to the field of
satellite interference; in a DDS+PLL link, a 4-10GHz waveband is synthesized, a
double phase locked loop internal mixing synthesis mode is adopted, a
secondary phase locked loop adopts a mode of stimulating PLL by DDS, and a main
phase locked loop is inserted into an output frequency so as to be mixed with the output frequency; in a DAFS link, DDS+PLL output is utilized as input and expanded to a 0.1-18GHz
band width by virtue of a frequency multiplication, frequency demultiplication and down
frequency conversion mode so as to be output; and in the whole
frequency synthesis process, through carrying out frequency control by virtue of a singlechip and an FPGA (
Field Programmable Gate Array) and reasonably selecting the output frequency, frequency multiplication times and mixing frequency of each link, the final output frequency has the characteristics of low
phase noise and
wide band, and simultaneously the output of strays and
harmonic waves can be well restrained.