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Ruthroff transmission line transformers, Guanella baluns, lowpass and bandpass filters, and balanced transmission lines using multilayer technology.

Sobrany, Riaz F. (2005) Ruthroff transmission line transformers, Guanella baluns, lowpass and bandpass filters, and balanced transmission lines using multilayer technology. Doctoral thesis, University of Surrey (United Kingdom)..

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Abstract

This study investigates novel three-dimensional passive microwave components that make use of multilayer technology defined as a production process employing several alternately stacked layers of metal and dielectric structures. Components developed include conventional and equal delay Ruthroff transformers; Guanella baluns; stepped impedance lowpass filters; bandpass filters formed from quarter wavelength stubs and transmission line sections; and balanced transmission lines. The theory of operation of each component is described along with the required design procedures for fabrication in the form of a multilayer MMIC using the Caswell H40 process, or a multilayer MIC using the Hibridas photoimageable thick-film process. New practice includes the development of novel structures including a balanced transmission line with conductors arranged in a broadside configuration; a pseudo coplanar waveguide transmission line with a high characteristic impedance; and a new design of compensated microstrip T-junction with clearly defined reference planes between the three branch lines. An investigation into how certain components operate has resulted in two pieces of new theory which are: a design procedure for bandpass filters formed from quarter wavelength stubs and transmission line sections; and a new theory of operation of equal delay Ruthroff transformers and Guanella baluns which takes into account the parasitic common mode currents. Also included in the thesis are: a brief history of MICs and MMICs including an overview of the different fabrication processes used by industry; a comprehensive description of the Caswell H40 multilayer MMIC process, and the Hibridas photoimageable thick-film process; and a section devoted to test and measurement procedures for circuits fabricated in a MIC or MMIC form using microwave probes, which includes a critical analysis of different calibration and de-embedding methods, and details of suitable test equipment and procedures for testing multiport circuits and circuits with balanced ports.

Item Type: Thesis (Doctoral)
Divisions : Theses
Authors :
NameEmailORCID
Sobrany, Riaz F.
Date : 2005
Contributors :
ContributionNameEmailORCID
http://www.loc.gov/loc.terms/relators/THS
Depositing User : EPrints Services
Date Deposited : 09 Nov 2017 12:13
Last Modified : 15 Mar 2018 22:33
URI: http://epubs.surrey.ac.uk/id/eprint/843277

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