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A new approach is proposed for designing a decoupling feeding network for phased arrays. The proposed approach results in significant hardware savings and enables to match each of the input ports individually and independently of the excitation.
We present a new parametric macromodeling technique for lossy and dispersive multiconductor transmission lines (MTLs), that is suitable to interconnect modeling. It is based on a recently introduced spectral approach for the analysis of lossy and dispersive MTLs extended by utilizing the Multivariate Orthonormal Vector Fitting (MOVF) technique to build parametric macromodels in a rational form. They...
This work presents a fast solver that always annihilates the divergence of solenoidal functions, independent of the precision of the compressed impedance matrix elements. The solver is obtained by compressing a loop-tree transformed impedance matrix by using a properly tailored fast solver. Then the impedance matrix in the usual (and undecomposed) RWG basis is reconstructed by a linear-in-complexity...
The electric field integral equation (EFIE) has been widely used in the moment method (MoM) solution of electromagnetic problems. However, due to the spectrum property of the EFIE operator, the resulting MoM impedance matrix has eigenvalues clustered around the origin and at the infinity as the mesh density increases, leading to a dramatic increase of the matrix condition number. When the object is...
By using an indirect method for determining the characteristic impedance of uniform transmission lines embedded in coaxial connectors, a novel two tier L-L de-embedding method is presented. The proposed de-embedding method is suitable for S parameters characterization of GaN HEMTs packaged transistors mounted on a symmetrical and reciprocal test fixture. In addition, the new technique does not presents...
A bi-characteristic-impedance transmission line (BCITL) model has recently been used to analyze active loaded transmission lines. Interestingly, associated BCITL can exhibit nonreciprocal and amplifying behavior. However, associated formulas are complicated and do not provide much physical insight into the problems. Thus, the graphical tool developed for BCITLs is employed in this paper to analyze...
This paper presents and verifies a two-port model of a folded dipole. It also introduces a concept of orthogonal folded dipoles, which can be fed in two different manners, corresponding to the dual- and wide-band configurations, respectively. The input admittance of the dual-band case has been modeled and verified. The two configurations can produce nearly omnidirectional radiation patterns according...
A compact H-plane waveguide cruciform coupler using metallic posts has recently been proposed. It consists of two rectangular waveguides crossing each other at right-angles, two metallic posts arranged on a diagonal line of the cross region for producing directional properties, and one metallic post inserted for matching at each waveguide port. Generally, it is known that any lossless reciprocal 4-port...
This paper presents a simple procedure for evaluating the impedance matrix for the Peano-Gosper fractal array, a further development of the recursive procedure for the impedance matrix for the Peano-Gosper fractal array proposed by Kuhirun. This procedure enables us to evaluate the impedance matrix without formulating an explicit recursive relation of the impedance matrix.
This paper describes the problems of mode conversion on differential lines. For the determination of mode conversion between the common mode and the differential mode two possibilities are suggested. The first method is the use of modal impedance matrices Zmacrm to analyse the conversion related to current and voltage. The second method uses the S-parameters to calculate the mixed mode parameters...
Extending the Grasp Compliance Center concept to grasps in dynamic situations, our previous work (Shimoga and Goldenberg, 1991) formulated a concept termed the Grasp Admittance Center and showed that a grasp with an admittance center will have 4 distinct advantages ?? stability, decoupled force/motion relation, decoupled time response and the ease of assigning the grasp dynamic behavior. A grasp admittance...
A general method of finding linear transformations to eliminate the coupling between substitutive networks is developed. The method is compared with that of symmetrical components and modified symmetrical components and its practical applicability is discussed.
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