Browsing by Author "HUANG, JW"

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CHARACTERISTICS OF DIELECTRIC-LINE-LOADED CONDUCTOR-BACKED SLOTLINE (CBS)
(1994-07-01)
HUANG, JW
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TZUANG, CKC
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交大名義發表
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傳播研究所
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National Chiao Tung University
The mode-coupling phenomenon prevents the conventional shielded conductor-backed slotline (CBS) from broadband applications. This paper proposes a modified CBS by adding a dielectric line of higher dielectric constant on the top of the dot region to circumvent the mode-coupling problem. The dispersion characteristics of the resultant dielectric line-loaded CBS are studied by using the full-wave space-domain Green's impedance. function approach. The theoretic results show that the particular modified CBS significantly reduces mode-coupling phenomenon and is suitable for broadband applications. Furthermore, it is possible to adjust the values of the propagation constant and the characteristic impedance by changing the thickness of the dielectric line on top of the slot region. Finally, the design curves for the dielectric line-loaded CBS are provided for potential applications.
GREENS IMPEDANCE FUNCTION-APPROACH FOR PROPAGATION CHARACTERISTICS OF GENERALIZED STRIPLINES AND SLOTLINES ON NONLAYERED SUBSTRATES
(1994-12-01)
HUANG, JW
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TZUANG, CKC
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交大名義發表
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電信工程研究所
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National Chiao Tung University
A newly proposed generalized full-wave space-domain integral equation technique incorporating dyadic Green's impedance function and a new set of basis functions are presented for the analysis of striplines and slotlines arbitrarily integrated on multiple nonlayered sustrates. The generalized full-wave integral equation technique is validated by conducting convergence study and several case studies. The theoretical dispersion characteristic of the transmission lines obtained here are in very good agreement with the published and measured data for the modified Microslab and the microstrip proximity effect near substrate edge. For the slotline type problem, where a new set of current basis function must be derived to be incorperated into Green's impendance function approach, the new approach presented here shows that the corresponding propagation characteristics thus obtained are also in excellent agreement with those reported in the available literature, which normally used the slot electric fields as the unknowns. To explain bow general the present formulation is, it can be reduced to the well-known spectral domain formulation for any guided-wave structure containing only layered substrates.
MODE-COUPLING-AVOIDANCE OF SHIELDED CONDUCTOR-BACKED COPLANAR WAVE-GUIDE (CBCPW) USING DIELECTRIC LINES COMPENSATION
(1994)
HUANG, JW
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TZUANG, CKC
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傳播研究所
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Institute of Communication Studies
RESONANT PHENOMENA IN CONDUCTOR-BACKED COPLANAR WAVE-GUIDES (CBCPWS)
(1993-12-01)
LO, WT
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TZUANG, CKC
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PENG, ST
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TIEN, CC
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CHANG, CC
This paper presents a thorough and systematic investigation of resonant phenomena in conductor-backed co-planar waveguides (CBCPW's). We used a full-wave analysis first to establish benchmark results and a series of measurements have been conducted to confirm the theoretical results. As many as ten structures of different side-plane patterns were built and tested. All the test circuits exhibit many resonances over a frequency range, as measured in terms of two-port scattering parameters. Our full-wave analysis is capable of analyzing shielded guided-wave structures with finite-width substrate, and yields the scattering parameters of the coplanar waveguide circuits accounting for the overmoded-wave propagation. Finally, simple models are developed for physical understanding and interpretation of the resonant phenomena. When treating the side planes as patch resonators, we show that the resonant frequencies can be accurately estimated by this simple model. Followed by another MSL (microstrip-like) model, which considers the excitation of the first and the second MSL modes, the resonant frequencies thus obtained are also shown to be in very good agreement with measured results. By displaying the current distributions on the conductor strips in the through or resonant states of the test circuits, the MSL modes of resonances or the patch-type resonances can be clearly seen. When resonance occurs, the electromagnetic energy is confined or carried underneath the side planes and the signal energy can hardly propagate through the central signal line of the test circuit.