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EEE428 MICROWAVES II

Course Objectives

Teach students passive microwave circuit design techniques including theoretical analysis, computer simulation, design, optimization, prototyping, and testing.

Course Content

Passive reciprocal and nonreciprocal devices. Electromagnetic resonators. Periodic structures and microwave filters. Microstripline structures and coupled lines. Solid state microwave devices.

Course Learning Outcomes

COURSE OUTLINE:

5. IMPEDANCE MATCHING AND TUNING.

5.1 Matching with Lumped Elements (L Networks).Analytic Solutions.Smith Chart Solutions.

5.2 Single-Stub Tuning.Shunt Stubs.Series Stubs.

5.3 Double-Stub Tuning.Smith Chart Solution.Analytic Solution.

5.4 The Quarter-Wave Transformer.

5.5 The Theory of Small Reflections.Single-Section Transformer.Multisection Transformer.

5.6 Binomial Multisection Matching Transformers.

5.7 Chebyshev Multisection Matching Transformers.Chebyshev Polynomials.Design of Chebyshev Transformers.

6. MICROWAVE RESONATORS.

6.1 Series and Parallel Resonant Circuits.Series Resonant Circuit.Parallel Resonant Circuit.Loaded and Unloaded Q.

6.2 Transmission Line Resonators.Short-Circuited l/2 Line.Short-Circuited l/4 Line.Open-Circuited l/2 Line.

6.6 Excitation of Resonators.Critical Coupling.A Gap-Coupled Microstrip Resonator.An Aperture-Coupled Cavity.

7. POWER DIVIDERS AND DIRECTIONAL COUPLERS.

7.1 Basic Properties of Dividers and Couplers.Three-Port Networks (T-Junctions).Four-Port Networks (Directional Couplers).

7.2 The T-Junction Power Divider.Lossless Divider.Resistive Divider.

7.3 The Wilkinson Power Divider.Even-Odd Mode Analysis.Unequal Power Division and N-Way Wilkinson Dividers.

7.5 The Quadrature (90.) Hybrid.Even-Odd Mode Analysis.

7.6 Coupled Line Directional Couplers.Coupled Line Theory.Design of Coupled Line Couplers.Design of Multisection Coupled Line Couplers.

7.8 The 180. Hybrid.Even-Odd Mode Analysis of the Ring Hybrid.Even-Odd Mode Analysis of the Tapered Coupled Line Hybrid.Waveguide Magic-T.

ADS Examples

5 - Using ADS Smart Component (Wilkinson-smart_wrk)

Design Wilkinson power combiners (single section, multisection), 90-Degree Hybrid Couplers, Coupled line coupler, rat-race couplers, Lange-couplers, Filters BPF, LPF, HPF (coupled line, stepped impedance, stub, TEE-dividers, zigzag, hairpin, interdigital) impedance transformers (single section, multi-section stepped, tapered), stub matching networks (single, double), resistive attenuators.

6 - Designing a 3way (unequal) Power Divider (ThreeWayPD_wrk)

Normal (or equal) power divider gives 1/2 (or -3dB) power at the two output ports. It is quite straight forward to design a 2-way power divider, where two arms of equal impedance (=70.7 Ohm) are used with 100 Ohm isolation resistor. Sometimes, RF applications need 3way (or unequal) power division.

8. MICROWAVE FILTERS.
8.1 Periodic Structures.Analysis of Infinite Periodic Structures.Terminated Periodic Structures.k-beta Diagrams and Wave Velocities.
8.2 Filter Design by the Image Parameter Method.Image Impedances and Transfer Functions for Two-Port Networks.Constant-k Filter Sections.m-Derived Filter Sections.Composite Filters.
8.3 Filter Design by the Insertion Loss Method.Characterization by Power Loss Ratio.Maximally Flat Low-Pass Filter Prototype.Equal-Ripple Low-Pass Filter Prototype.Linear Phase Low-Pass Filter Prototypes.
8.4 Filter Transformations.Impedance and Frequency Scaling.Bandpass and Bandstop Transformations.
8.5 Filter Implementation.Richard's Transformation.Kuroda's Identities.Impedance and Admittance Inverters
8.6 Stepped-Impedance Low-Pass Filters.Approximate Equivalent Circuits for Short Transmission Line Sections.
8.7 Coupled Line Filters.Filter Properties of a Coupled Line Section.Design of Coupled Line Bandpass Filters.
8.8 Filters Using Coupled Resonators.Bandstop and Bandpass Filters Using Quarter-Wave Resonators.Bandpass Filters Using Capacitively Coupled Series Resonators.Bandpass Filters Using Capacitively Coupled Shunt Resonators

ADS Examples

7 - Learn Tuning an Elliptic Filter, a Dynamic Load Line, and a Microstrip Bandpass Filter ((Learn_Tune_wrk)

This example shows how to use the Advanced Design System (ADS) tuning feature to optimize your designs.

8 - 12GHz Two Section Microstrip Filter (mw_filter_wrk)

Demonstrates a simple bandpass filter composed of two concatenated microstrip subnetworks to achieve the desired performance at 12 GHz. It illustrates the Advanced Design System (ADS) feature of a microstrip circuit simulation and auto creating the layout from the schematic.

9 - Optimization of a Low Pass Filter (LPFoptim_wrk)

This example shows how to set-up and run a basic optimization for realizing a low pass filter.

Program Outcomes Matrix

0: No Contribution 1: Little Contribution 2: Partial Contribution 3: Full Contribution