By Xuan Hui Wu, Allen Glisson, Ahmed Kishk
This ebook provides a step by step presentation of a generalized transmission line approach to research the far-zone radiation of antennas below a multilayer constitution. commonly, a radiation challenge calls for an entire wave research that may be time eating. the great thing about the generalized transmission line technique is that it transforms the radiation challenge for a selected kind of constitution, say the multilayer constitution excited about an antenna, right into a circuit challenge that may be successfully analyzed. utilizing the Reciprocity Theorem and far-field approximation, the strategy computes the far-zone radiation because of a Hertzian dipole inside of a multilayer constitution through fixing an similar transmission line circuit. for the reason that an antenna will be modeled as a collection of Hertzian dipoles, the tactic might be used to foretell the far-zone radiation of an antenna below a multilayer constitution. The analytical expression for the far-zone box is derived for a constitution without or with a polarizer. The process of acquiring the Hertzian dipole version that's required through the generalized transmission line technique is usually defined. numerous examples are given to illustrate the functions, accuracy, and potency of this technique. desk of Contents: Antennas below a Multilayer Dielectric Slab / Antennas less than a Polarized Multilayer constitution / Hertzian Dipole version for an Antenna / Bibliography / Biograph
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Additional resources for Generalized Transmission Line Method to Study the Far-zone Radiation of Antennas under a Multilayer Structure (Synthesis Lectures on Antennas)
8). The existence of a cavity mode makes the system matrix singular and thus the method fails. Numerically, the cavity mode is difﬁcult to remove from the solution. On the other hand, the investigation of the system matrix singularity can be used to help us in practical design. 10, the cavity mode should be avoided because it traps the wave inside the structure and thus reduces radiation efﬁciency. So, the TL method can be used to optimize a multilayer structure to avoid the cavity mode. 7 CONCLUSIONS The TL method was generalized to compute the far-ﬁeld radiation of Hertzian dipoles in a multilayer structure embedded with PEC strip interfaces.
The monopole antenna case, the two dielectric slabs are removed to obtain the Hertzian dipoles, with the assumption that the presence of the slabs does not signiﬁcantly affect the current distribution. In this study, the tangential electric ﬁelds used to get the Hertzian dipoles are obtained by simulating the structure without the dielectric slabs using the WIPL-D commercial software package . With the tangential electric ﬁeld data, the Particle Swarm Optimization (PSO) method [14, 15], instead of the Genetic Algorithm (GA) used in , is adopted to ﬁnd the Hertzian dipoles equivalent to the DRA.
5) eliminates T E , bT E , a T M , and bT M : a1,k 1,k 1,k 1,k ⎤ ⎡ ⎤ TE TE b2,k+1 a2,k+1 ⎥ ⎢ ⎥ ⎢ aT M bT M ⎥ ⎢ ⎥ ⎢ ⎢ T E T E2,k+1 T E T E ⎥ = Sk ⎢ T E T E2,k+1 T E T E ⎥ . 3. RADIATION DUE TO A MAGNETIC DIPOLE 35 Therefore, a total of 4(N − 1) equations can be obtained from all the PEC-SIs. 7) T M T M T M TM a2,1 Rc,L b2,1 Rc,L T E and R T M are the nominal impedance of the port connecting the loads for the TE and where Rc,L c,L TM modes, respectively. Two additional linear equations can be obtained from the known excitation T E and a T M : sources a1,N 1,N T E = P T E b T E + QT E a T E a1,N N N 2,N 2,N T M = P T M b T M + QT M a T M a1,N N N 2,N 2,N .
Generalized Transmission Line Method to Study the Far-zone Radiation of Antennas under a Multilayer Structure (Synthesis Lectures on Antennas) by Xuan Hui Wu, Allen Glisson, Ahmed Kishk