Implementation of a wideband RF hybrid coupler in the optical domain

Emami, H 2008, Implementation of a wideband RF hybrid coupler in the optical domain, Doctor of Philosophy (PhD), Electrical and Computer Engineering, RMIT University.

Document type: Thesis
Collection: Theses

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Title Implementation of a wideband RF hybrid coupler in the optical domain
Author(s) Emami, H
Year 2008
Abstract With rapid development in telecommunication and electronic warfare technology, faster and more flexible systems are in demand.
Wideband signal processors are thus needed to implement such systems. Microwave photonics has been introduced as a tool of achieving ultra broad communication systems. RADAR, navigation, and radio astronomy systems can also utilise microwave photonics to achieve broader bandwidths.
Quadrature hybrid couplers play an important major role in microwave equipments from balanced mixers/amplifiers to instantaneous frequency measurement systems. Traditional wideband hybrid couplers are already available in the microwave domain but there are still limitations on bandwidth and phase ripple as well as input/output impedance.
The aim of this thesis is to develop a wideband quadrature hybrid coupler utilizing microwave photonics technology and to demonstrate the application of such a coupler.
Major contributions made by this work include the implementation of a photonic Hilbert transformer, which can be used to achieve in-phase and quadrature-phase generation over a wideband frequency range (2-18 GHz) with low phase ripple (3 dB). This Hilbert transformer is used as a quadrature hybrid coupler to implement a microwave photonic instantaneous frequency measurement system with a wide frequency measurement range and a photonic feed for a reconfigurable four arm sinuous antenna.
Degree Doctor of Philosophy (PhD)
Institution RMIT University
School, Department or Centre Electrical and Computer Engineering
Keyword(s) Microwave photonics
Hybrid coupler
Instantaneous frequency measurement
Sinuous antenna
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Created: Thu, 13 Sep 2012, 11:55:27 EST by Maria Lombardo
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