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A novel microstrip radial 1∶19 power divider is proposed in this paper. The conventional impedance transformation method is used here with a single substrate to realize 1 to 19 power transmission. To verify our design, the power divider is fabricated and tested. It can be observed that it achieves 29.4% impedance bandwidth (VSWR<2), the transmitted magnitude and phase imbalance for 19 outputs are...
The design of a tri-band dual-polarization (TBDP) shared-aperture microstrip array antenna for synthetic aperture radar (SAR) applications is presented. It operates at L-, S- and X-bands with a frequency ratio of 1:2.8:8. This TBDP shared-aperture array is assembled by two L/S and L/X DBDP shared-aperture sub-arrays with one L-band dual-polarized sub-array. A prototype array has been fabricated and...
The design of a L/S/X tri-band dual-polarization (TBDP) shared-aperture microstrip array antenna for synthetic aperture radar (SAR) applications is introduced, which is assembled by two dual-band (L/S and L/X) dual-polarization shared-aperture sub-arrays and one L-band dual-polarization sub-array. The measured results give wide impedance bandwidth (VSWR≤2) of 13.4%, 14.8% and 16.8% in L-, S- and X-...
High Cure temperature and larger coercive field ternary Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 (PIN-PMN-PT or PIMNT) single crystals were grown, while maintain comparable piezoelectric properties with PMN-PT. We have designed and prototyped 1.6MHz ultrasonic transducers based on PIN-PMN-PT single crystals, which can be used in transcranial Doppler (TCD) ultrasonography. Compared with PZT-based TCD...
The back-projection (BP) algorithm is a popular imaging method. Nevertheless, there exists a difficulty that the cross-range resolution acquired by the standard BP algorithm is dependent on the bandwidth of transmitted signal when the BP algorithm is directly used to the multiple-input multiple-output (MIMO) radar for imaging a target in the cross-range direction without any variation. In this paper,...
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