Anyone always feel the microwave engineering was so difficult and the physical images of several phenomena were hard to be understood. This tutorial will be done with the mindset of such young engineers to want to re-learn the microwave guided theory, based on the trying experience of the superficial speaker, learning by mistake on how to master the essence of the microwaves by the level of high school knowledge in his university time.
Note that your compasses and scale should be brought on the day because some exercises of the fundamental circuit design will be lectured by using the Smith-chart and S-matrix.
 

In this tutorial lecture, the fundamental design theory of microwave filters is described based on the most commonly used equivalent circuits of microwave filters. Various design examples are provided to explain the important respects in the design procedure of microwave filters, including considerations relating the equivalent circuits and the configurations of resonators and filters, appropriate use of circuit and electromagnetic simulators for the effective design purpose. Some recent research topics and new design methods of microwave filters are also presented.
 

Vector network analyzers (VNAs) and Spectrum analyzers (SA) are widely used in the measurements for circuits, components and antennas.
In recent years, operation frequency range of device measurements is changing from microwave to millimeterwave and submillimeterwave lengths by the development of leading edge communication technologies.
In this session, basic theory of operation of VNA and SA is explained, then a six-port type VNA is also introduced as a effective solution for the device measurements at the millimeterwave and the submillimeter wave range.

In design and development for microwave amplifiers, advanced circuit simulators are widely used, but the simulators do not give any circuit configurations and information with respect to power amplifying operation modes.
This lecture first explains microwave impedance matching circuit technology that is basic and important technology for microwave amplifier design. Then, basic power amplifying large-signal operations and nonlinear distortion behaviors of microwave power amplifiers are explained.
 

Everyone can find a series LCR topology with formula Q = ωL/R in a textbook. Practical circuits however have more complex topologies, and their Q factor equations are not found with ease. Even career engineers often meet difficulties to estimate ones with distributed elements, and cannot help resorting to circuit simulators.
This lecture gives a basic but sophisticated technique on how to derive Q factor formula for a variety of resonant circuits with a pencil and paper. Never miss this rare chance not only to just listen it but also to positively take part in challenging yourself to the provided exercises on your notebook or on the classroom white board.

2Design Method of Oscillators - Focus on Oscillator's Q Factor -

Kenji Itoh, Tomoya Morimasa (Kanazawa Institute of Technology), Takashi Ohira (Toyohashi University of Technology)

Leeson's formula is well-known one for phase noise behavior in oscillators. However relationship between Q factor Qosc in Leeson's formula and resonator's Q has not been analyzed in past works. Recently Ohira clarified the method to formulate oscillators' Q factor Qosc from circuit parameters.
In this presentation, formulation of Qosc by Ohira's method is presented for the oscillator with the coaxial resonator. Furthermore the relationship between Qosc and resonator's Q is formulated and the formula represents that Qosc is proportional to resonator's Q under some assumptions. This is the well-known fact with experimental approaches, and is the first analytical clarification.
In addition to above, experimental investigations of phase noise are demonstrated for several oscillators with different resonator's Q factors. Measured phase noise is agreed with theoretical prediction by analyzed Qosc within 1.3dB. This is the first experimental confirmation of Qosc defined by Ohira.