Antennas Tuning

Your antenna worked on the datasheet. Why doesn't it work in your product?

Off-the-shelf antennas are tested on the manufacturer's evaluation board, in free space. Put one on your own PCB, inside a plastic enclosure next to a battery, and its resonance drifts, its impedance shifts, and your range drops. Antennas Tuning is a short, practical guide to fixing that.

Written by an RF and hardware engineer with a PhD in wireless communication, this book takes you from a first prototype to a properly tuned antenna, using a vector network analyzer (VNA) and the Smith chart.

Inside you'll learn how to:

• Read S11, return loss, VSWR and complex impedance, and convert between them using a quick-reference table
• Use the Smith chart without memorizing it: what each region means and how every inductor and capacitor moves your impedance point
• Set an antenna's resonant frequency by adjusting its length, with a 2.4 GHz PCB antenna example
• Understand what detunes an antenna, including ground plane size, nearby copper, plastic enclosures and the human hand
• Design and populate a pi matching network (Z~shunt~ and Z~series~) and choose real component values
• Follow a repeatable, step-by-step tuning procedure on the bench
• Work through a complete 2.4 GHz Wi-Fi matching example by hand, from measured impedance to standard component values

The book also includes a troubleshooting table, a formula quick reference, a glossary and links to free online Smith chart tools.

Who it's for: hardware and embedded engineers, PCB designers, RF technicians and engineering students who need a working antenna more than they need antenna theory. No electromagnetics background is required; just comfort with complex numbers and basic circuit components.

Get your antenna resonating where it should, matched to 50 Ω, and radiating the power you designed for.