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Coplanar stripline circuit analysis and applications to filters, antennas and wireless power transmission
xvi, 148 leaves : illustrations ; 28 cm.
This dissertation provides coplanar stripline (CPS) investigation for the CPS circuit analysis and applications to filters, antennas and wireless power transmission. CPS characteristics for the practical design considerations are investigated. For the CPS components measurements, two types of broadband CPS-to-microstrip transition are developed. By using these transitions, CPS components are easily measured using a conventional network analyzer. Printed dipole antenna feeding can be also easily implemented using the transition. Various new CPS resonators using open-ended T-strips, short-ended strips and T-slots are modeled, designed and their performances are investigated in terms of Q factor or bandwidth. The measurements of new CPS resonators are performed with the new transitions. As applications of the proposed CPS resonators, new CPS bandpass filters are demonstrated. The design methods of bandpass filters and their lumped-element equivalent circuits are presented. A simple CPS lowpass filter is developed using interdigital capacitors and CPS transmission line. A novel CPS Tee junction using coupled CPS (CCPS) is introduced. As an application of CPS Tee junction, a twin dipole antenna fed by microstrip-to-CPS Tee junction is presented at Ka-band. A 1 x 8 printed dipole phased array using a piezoelectric transducer (PET) controlled phase shifter is developed with the twin dipole antenna. As a circuit application of CPS, a dual frequency rectenna is developed at 2.45 and 5.8 GHz. For dual frequency rectenna components, a dual frequency antenna, CPS lowpass filter and CPS bandstop filters are developed. To achieve high RF-to-DC conversion efficiencies at both frequencies, diode analyses are performed for frequency insensitive high conversion efficiency. A novel simple microwave power detector using a GaAs MESFET is developed at 5.8 GHz for wireless power transmission application. The developed detector is self-biased and no additional bias circuits are required. A circularly polarized rectenna using a truncated-corner square patch antenna at 5.8 GHz is developed for microwave power transmission. With circularly polarized antennas, the transmitter and receiver have greater freedom in their positioning and can overcome the loss due to the misalignment between both transmitting and receiving antennas.
"Major Subject: Electrical Engineering".
Issued also on microfiche from University Microfilm Inc.
Includes bibliographical references (leaves 124-131).