Synthesis and Design of Novel Dual-Mode Microwave Filters
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Authors
Wahby, Mahmoud
Date
2011-04-08T17:03:25Z
Type
thesis
Language
eng
Keyword
microwave , filters
Alternative Title
Abstract
This thesis describes the synthesis and design of two novel dual-mode
microwave waveguide filter structures. The mode degeneracy is fundamental to this
design technique. The first design introduces a structurally symmetric dual-mode cavity
pseudo-elliptic band-pass filter, which has been implemented by only asymmetric
structures so far. It is also used to shed light on the concepts of positive and negative
coupling in dual-mode filters. A novel iris coupling structure is investigated allowing
negative coupling coefficients required for certain polarizations of modes in dual- mode
rectangular cavities. A 4th order dual-mode band-pass filter is designed at 11 GHz with a
bandwidth of 200 MHz, an in-band return loss of 20dB and two transmission zeros at
normalized frequencies of ±1.6. The filter makes use of the negative coupling property of
the iris for inter-resonance coupling of the modes of horizontal orientation inside the
cavity. The desired performance of the filter was achieved by the initial design without
any optimization.
The second design is especially convenient when temperature compensation is of
prime concern. A direct design technique is developed and demonstrated with computer
simulation and measurement in circular waveguide technology on a 4th order filter with a
bandwidth of 50 MHz at 11 GHz, an in-band return loss of 20 dB and two normalized
transmission zeros at ±1.5.
Description
Thesis (Master, Electrical & Computer Engineering) -- Queen's University, 2011-04-08 12:41:14.602
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