A Compact H-Plane Magic Tee Designed at W Band

Abstract

Abstract-Magic tee is a widely used component in microwave systems; the four arms of a conventional magic tee direct at four different directions, which occupy much space and give inconveniences to the assemblage of a system. In this paper, a waveguide narrow-wall slot directional coupler and an E-plane dielectric loaded waveguide phase shifter are used to make up of a magic tee with four arms in the same H-plane. The narrow-wall slot directional coupler is analyzed with mode matching method and optimized with simulated annealing method, and the dielectric loaded waveguide phase shifter is designed with edge based finite element method. Numerical results of the magic tee are presented, which show that the performance of the designed magic tee is good.

Consistency in Formulation of Spin Current and Torque Associated with a Variance of Angular Momentum

“…However, a more fundamental question is emerged in the conventional understanding of SHE. The validity of the description for various physical properties of SHE depends on the correctness of definition for the spin current operator [13,14,15]. Since the translational and rotational motions are associated to the force and torque, without a rigorous definition of spin current, in some sense, the discussion about the convenient power source for the spin current is also somewhat arbitrary.…”

“…Currently, the spin current operator is practically defined in analogy with that of charge current as a tensor operator of symmetric multiplying of Pauli matrix and velocity, [2,3,4]. Nevertheless it does not satisfy a continuity equation [13,14,15], ∂ρ S α /∂t+∇·J S α = 0, where ρ S α = ( /2)ψ † σ α ψ is a spin density. Unlike the charge current, the conserved spin current can not be obtained within the context of Schrödinger equation with the addition of the SO interaction.…”

An Impulse-Radio-Based Ultrawideband Rf Front-End Module With a New Multilayered Microwave Sampler

“…The magic-T, or the 180 • hybrid coupler, is known as one of the core components in various microwave circuits [13][14][15][16][17][18][19][20]. Conventional magicTs are commonly designed with double-sided printed circuit broads by utilizing quarter-wavelength lines in either microstrip form [13], stripline form [14], microstrip/slotline hybrid form [15,16], coplanar waveguide (CPW)/slotline hybrid form [17], or waveguide form [18].…”

“…Conventional magicTs are commonly designed with double-sided printed circuit broads by utilizing quarter-wavelength lines in either microstrip form [13], stripline form [14], microstrip/slotline hybrid form [15,16], coplanar waveguide (CPW)/slotline hybrid form [17], or waveguide form [18]. The sizes of these designs, nonetheless, are inevitably large due to the existence of multiple quarter-wavelength lines.…”

Photobase generators derived from trans-o -coumaric acid for anionic UV curing systems without gas generation

“…However, it was difficult to chemically modify it to regulate the maximum absorption wavelength of the PBG. On the other hand, Wang et al 17,18 proposed the use of trans-o-coumaric acid to protect an amino group in organic syntheses. Under UV irradiation, photoisomerization from trans to cis isomers occurs, resulting in an intramolecular cyclization reaction to release amines.…”