Kyung-Whan Yeom's Microwave Circuit Design: A Practical Approach Using ADS
is a primary resource for engineers and graduate students looking to bridge the gap between high-frequency theory and real-world implementation. The text stands out by replacing exhaustive mathematical derivations with a focus on physical interpretation and hands-on simulation using Keysight’s Advanced Design System (ADS). Core Themes of the Text
The book is structured into two main segments: fundamental microwave concepts and specific active circuit design examples.
Bridging Theory and Practice: It focuses on understanding the meaning of calculated results rather than just the math.
Software-Driven Methodology: Readers learn to translate theoretical parameters into ADS schematics, perform electromagnetic (EM) simulations, and generate physical layouts for fabrication.
Industry Relevance: The topics covered are essential for modern mobile communications, satellite systems, and radar technology. Key Design Modules Covered
The text provides step-by-step guides for designing the most critical components of a microwave communication system:
Low-Noise Amplifiers (LNA): Mastering stability factors, noise circles, and conjugate matching to ensure signal integrity.
Power Amplifiers (PA): Learning linearity, classification, and finding optimum load impedances.
Oscillators & PLLs: Analyzing phase noise and oscillation conditions for frequency synthesis.
Mixers: Qualitative and quantitative analysis of single- and double-balanced mixers using Schottky diodes. Practical Learning Features
Simulation Tutorials: Practical walkthroughs for using ADS windows, toolsets, and frameworks.
Hands-on Problem Sets: Every chapter includes exercises designed to reinforce physical concepts through simulation.
Adaptability: While it uses ADS, the techniques are described such that they can be adapted to other EDA tools like Microwave Office.
You can find more detailed chapter breakdowns and summaries on platforms like O'Reilly Media or the Pearson Education site. Microwave Circuit Design: A Practical Approach Using ADS
Microwave Circuit Design: A Practical Approach using ADS
The design of microwave circuits is a complex and challenging task that requires a deep understanding of electromagnetic theory, circuit analysis, and simulation tools. With the increasing demand for high-frequency electronic systems, such as wireless communication systems, radar systems, and microwave ovens, the need for skilled microwave circuit designers has become more pressing than ever. In this article, we will discuss a practical approach to microwave circuit design using Advanced Design System (ADS), a popular software tool used in the industry.
Introduction to Microwave Circuit Design
Microwave circuit design involves the creation of electronic circuits that operate at frequencies above 300 MHz, which is the range of microwave frequencies. At these high frequencies, the behavior of electronic circuits is significantly different from that at lower frequencies, and designers must take into account the effects of electromagnetic radiation, transmission line effects, and parasitic components. microwave circuit design a practical approach using ads pdf
The design of microwave circuits requires a multidisciplinary approach, combining knowledge of electromagnetic theory, circuit analysis, and simulation tools. The goal of microwave circuit design is to create a circuit that meets the required specifications, such as frequency range, bandwidth, gain, and noise figure.
ADS: A Powerful Tool for Microwave Circuit Design
Advanced Design System (ADS) is a software tool developed by Keysight Technologies that is widely used in the industry for microwave circuit design. ADS provides a comprehensive environment for designing, simulating, and testing microwave circuits, including:
Practical Approach to Microwave Circuit Design using ADS
The following steps outline a practical approach to microwave circuit design using ADS:
Design Example: A Microwave Amplifier
As an example, let's design a microwave amplifier using ADS. The specifications of the amplifier are:
Step 1: Create a Circuit Schematic
The circuit schematic is created using the ADS Schematic Editor, as shown in Figure 1.
Step 2: Simulate the Circuit
The circuit is simulated using the ADS Simulator, and the results are shown in Figure 2.
Step 3: Optimize the Circuit
The circuit is optimized using ADS to achieve the required gain and noise figure, as shown in Figure 3.
Step 4: Create a Physical Layout
The physical layout of the circuit is created using the ADS Layout Editor, as shown in Figure 4.
Step 5: Analyze the Electromagnetic Behavior
The electromagnetic behavior of the circuit is analyzed using ADS Momentum, as shown in Figure 5.
Conclusion
Microwave circuit design is a complex and challenging task that requires a deep understanding of electromagnetic theory, circuit analysis, and simulation tools. ADS is a powerful tool that provides a comprehensive environment for designing, simulating, and testing microwave circuits. By following a practical approach to microwave circuit design using ADS, designers can create high-performance microwave circuits that meet the required specifications.
References
Download the PDF
For a more detailed and comprehensive guide to microwave circuit design using ADS, download the PDF version of this article: [insert link to PDF].
Table of Contents
Appendix
By following this practical approach to microwave circuit design using ADS, designers can create high-performance microwave circuits that meet the required specifications. Download the PDF version of this article for a more detailed and comprehensive guide to microwave circuit design using ADS.
"Microwave Circuit Design: A Practical Approach Using ADS" by Kyung-Whan Yeom provides a comprehensive, hands-on guide for designing active microwave circuits using Keysight Technologies’ Advanced Design System (ADS). The text emphasizes practical, simulation-focused techniques for modern RF applications over exhaustive theoretical derivations. For a detailed overview of the book's contents, see the publisher's page on informit.com
Microwave Circuit Design A Practical Approach Using Ads [PDF]
"Microwave Circuit Design: A Practical Approach Using ADS" by Kyung-Whan Yeom focuses on bridging theoretical microwave concepts with real-world implementation using Keysight’s ADS software. The text covers foundational passive device design and provides detailed, practical workflows for active components like LNAs and mixers. For more details, visit O'Reilly Media.
Microwave Circuit Design A Practical Approach Using Ads [PDF]
The cursor blinked incessantly on the monitor, a steady heartbeat against the backdrop of a darkened lab. Outside, the rain lashed against the windows of the engineering building, but inside, the air was still and smelled faintly of ozone and stale coffee.
Elena rubbed her temples. On her desk sat a schematic printout that looked like a chaotic spiderweb. It was supposed to be a 5 GHz low-noise amplifier for the satellite communications project—a critical component for her thesis. But on the PCB, it was oscillating wildly, screaming at frequencies it had no business screaming at.
She sighed and pulled her backpack onto her lap. Buried beneath a tangle of coaxial cables and SMA connectors was the weapon she had been avoiding. It was a heavy, hardcover textbook, its spine cracked and white from stress: Microwave Circuit Design: A Practical Approach Using ADS.
She had bought the PDF version first, a digital ghost living on her tablet. But tonight, the PDF felt too distant. She needed the physical weight of the knowledge. She opened the book, the smell of old paper filling her senses. She navigated past the dense theoretical chapters on Maxwell’s equations—chapters she had skimmed in a panic during her undergrad years—and went straight for the meat: The ADS Tutorials.
ADS—Advanced Design System—was the software glowing on her screen. It was a powerful tool, capable of simulating the invisible world of radio waves, but it was also notoriously unforgiving. It demanded precision. It demanded that you speak its language.
Elena turned to Chapter 4: Impedance Matching and the Smith Chart.
The book didn't just dump formulas. It showed screenshots of the ADS interface. It had circles drawn on Smith charts—circles for constant Q, circles for stability, circles for noise. Schematic Editor : A graphical user interface for
"A practical approach," the title promised. Elena whispered the words like a mantra. "Okay, show me practical."
She looked at the diagram in the book, then at her screen. In the textbook, the author, a legendary professor, walked through the design of a matching network step-by-step. “The simulation is a lie if the model is a lie,” the text warned in a highlighted box. “Always check the stability circles before you bias the transistor.”
Elena froze. Stability circles.
She had biased her transistor, designed her matching networks for gain, and hit 'Simulate'. She had ignored the stability analysis because the numbers looked good on paper. But the book was pointing a finger at her. With trembling fingers, she opened the data display window in ADS and plotted the stability circles for her transistor.
On the virtual Smith chart, the circles were crowding the center. The book’s diagram showed a safe zone; her diagram showed a disaster waiting to happen. Her input matching network was sitting right inside the unstable region.
"That’s why it’s oscillating," she muttered, the realization washing over her like cold water. "It’s not the hardware. It’s the physics."
For the next three hours, the PDF on her tablet and the physical book on her desk became her co-pilots. She cross-referenced the stability charts. She adjusted the length of a microstrip line by fractions of a millimeter, watching the impedance trace crawl across the screen like a snake charmed by a flute.
The book taught her how to use the "Tuning" tool in ADS—a feature she had ignored. It showed her how to set up optimization goals. It was no longer about guessing capacitor values; it was about asking the software to solve the puzzle for her, guided by the constraints laid out in the text.
At 2:00 AM, the lab was silent except for the hum of the server rack.
Elena stared at the final schematic. It was clean. The stability circles were clear of the 50-ohm point. The gain was flat across the band. The noise figure was 0.5 dB better than her initial design.
She took a deep breath and clicked the final button: Layout.
The schematic turned into a physical representation of copper traces on a green substrate. She ran the Momentum simulation—a full-wave electromagnetic solver. It took twenty minutes. She watched the progress bar, tapping her finger on the cover of the book.
Ding. The simulation finished.
The plot appeared. S11, the reflection coefficient, was a deep valley at 5 GHz. S21, the gain, was a perfect plateau.
Elena sat back, exhaling a breath she felt she’d been holding all semester. The book lay open on the desk, the PDF glowed on the tablet, and the screen displayed a working design.
The practical approach had worked. It wasn’t magic; it was a disciplined dialogue between theory and simulation. She closed the heavy book, leaving a bookmark on the layout chapter, and finally turned off the monitor. The rain had stopped. The design was ready to be built.
This write-up is structured to highlight the value of the book for engineering students, professors, and RF professionals looking to bridge the gap between theory and application.
If you have ever designed a microstrip filter that simulated perfectly but failed miserably on the first prototype, you know the painful truth: Microwave circuit design is not just electromagnetic theory—it is the art of managing parasitics, materials, and manufacturing tolerances. Practical Approach to Microwave Circuit Design using ADS
For decades, the go-to weapon of choice for this battle has been Advanced Design System (ADS) from Keysight. While the official manuals are exhaustive, the practical "how-to" often remains tribal knowledge. This post outlines a pragmatic workflow using ADS, focusing on what actually works on a benchtop, not just in a data sheet.
(Note: While a specific PDF titled "Microwave Circuit Design a Practical Approach Using ADS" may not exist as a single canonical document, this post synthesizes the collective wisdom found in Keysight’s application notes, Pozar’s principles, and real-world design reviews.)