To overcome the limitation of the phased array (PA), the frequency diverse array (FDA) was introduced that can provide precise scanning in distance and angle domains. Utilizing microwave photonics (MWP), a FDA signal generation method based on dual optical frequency combs (OFCs) is proposed in this paper. The scheme successfully generates a five-channel FDA signal with a center frequency of 8 GHz and a frequency offset of 1 MHz. With a power flatness below 2.5 dB and a spurious suppression ratio exceed 27.2 dB, the method demonstrates ability to generate high-quality FDA signal and realize beam forming and scanning. Additionally, the radiation pattern shows a distinct “S” shape, influenced by distance and angle.
Microwave photonic channelized receiver is one of the important means to realize broadband radio frequency (RF) signal reception, and it also has great application potential in the fields of radar systems and electronic warfare. In view of the above, a microwave photonic channelizer with 66-subchannels based on acousto-optic frequency shifter (AOFS) is proposed. The 11-line optical frequency comb (OFC) used in this scheme is generated via one phase modulator. The 33 optical local oscillators can be obtained using two AOFSs to shift the frequency of 11-line OFC up and down. The 33 optical local oscillators and broadband RF signal are image-rejected and downconverted in the I / Q receiver and output by 66 subchannels with a bandwidth of 500 MHz. The simulation results verify the complete reception of 3 to 36 GHz wideband RF signal, and the spurious-free dynamic range of the system can reach 116.3 dB · Hz2/3.
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