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For the large sparse generalized saddle point problems with non-Hermitian (1,1) blocks, we introduce a constraint preconditioner, which is based on the positive definite and semidefinite splitting (PPS) iteration method. Then we discuss one trait of the PPS-based constraint preconditioner, such as invertibility. We give the convergence of conditions of the preconditioning iteration method. Moreover,...
A novel single-layer wideband cavity-backed E-shaped microstrip patch antennais proposed. By cutting a U-slot on the E-shaped patch and introducing a rectangle metallic cavity backed on the substrate just under the patch, the proposed antenna can generatevery wide impedance bandwidths. Through a two-section microstrip line impedance transformer, the designed microstrip antenna is fed by a 50Ω coplanar...
A dual-polarized phased array antenna for synthetic aperture radar (SAR) application is introduced in this paper. The RF topology configuration is illuminated briefly. An antenna module was tested and the measured results are presented, with which an applied array antenna should be extended with RF distribution networks, power supply and control subsystem used.
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