Analysis and implementation of multi-layered configurations to reduce mode coupling problems in conductor-backed coplanar waveguides for wide frequency-band microwave integrated circuit applications /
Packaged conductor-backed coplanar waveguides (CBCPW) for microwave integrated circuits (NHCS) can support rectangular waveguide and cavity modes within the substrate regions which can couple with the dominant quasi-TEM mode and produce several undesirable results. Lateral sidewalls connect the upp...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1996.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=743273561&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Packaged conductor-backed coplanar waveguides (CBCPW) for microwave integrated circuits (NHCS) can support rectangular waveguide and cavity modes within the substrate regions which can couple with the dominant quasi-TEM mode and produce several undesirable results. Lateral sidewalls connect the upper and lower ground planes of the structure together at the substrate edges in a wrap-around configuration using copper tape or through the package itself Strong mode coupling can cause the dominant mode field pattern to spread out across the entire waveguide width instead of being confined to the slot area. This phenomenon translates into a significant loss of power and the occurrence of strong resonances in the transmission measurements which limits the bandwidth of the waveguide even at lower frequencies. Multi-layered configurations with dielectrics loaded above and below the circuit conductors are employed to reduce the mode coupling without restrictions on the cross section (S+2W) or the lateral width (2A) of the waveguide which is particularly useful for MICS. The above effects associated with CBCPW are demonstrated and analyzed using waveguide theory, experimental data, and the spectral domain numerical method in one, two, and three dimensions. Leakage calculations for the dominant mode in the one-dimensional case are related to the mode coupling effects in two-dimensions. Summary tables and practical guidelines describing design tradeoffs for wide frequency-band operation are also presented. The inclusion of lossy damping layers to reduce the residual resonances associated with the substrate cavity without affecting the CBCPW resonator circuit Q are described with a three- dimensional procedure. Experimental data to 40GRz is utilized to verify the bandwidths for several of the configurations, confirm the explanations of the mode and cavity coupling effects, and demonstrate the improved responses with the incorporation of the absorbing material. |
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| Item Description: | Vita. "Major Subject: Electrical Engineering". |
| Physical Description: | xxvi, 235 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references. |