Abstract
Results of the development of a 6-channel chirped fiber grating beamformer (BF) for microwave linear phased array antenna (PAA) in receiving mode are presented. A BF incorporates DWDM technology based components of analogue fiber-optic transmission links with external modulation in microwave range 0.1–18 GHz and specially manufactured chirped fiber Bragg grating. In BF optical transmitters have optical carriers separated with 100 GHz step (ITU grid, DWDM standard in C-band). PAA beamforming is realized by introducing inter-channel time delays when microwave modulated optical carriers interact with chirped fiber Bragg grating in reflection mode, throughout the total operating spectral range occupied by 6-channel BF (6 × 100 GHz). The results of measuring the S-parameters of BF 6 analogue channels are given; these enable to synthesize far-field radiation patterns of the linear PAA with optical BF under investigation. Far-field patterns of 6 channel linear phased antenna array integrated with optical BF model have been measured and compared with calculated patterns taking into account amplitude and phase errors arising in beamformer channels.
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