Antenna Bandwith Expansion Guide

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Maximize Antenna Performance with Johanson’s Bandwidth Expansion Guide

Overview

This technical resource explains how to increase antenna bandwidth using proven layout techniques, matching networks, and ceramic RF components. Ideal for engineers working on Sub-GHz, 2.4GHz, and multi-band wireless designs in IoT, BLE, and LPWAN applications. Learn how to reduce return loss, optimize VSWR, and enhance overall RF efficiency—backed by real-world examples and layout tips.

Method for bandwidth expansion for chip antennas:

Layout with additional "elbow" to GND:

PCB layout diagram showing an antenna trace with an additional elbow routed to ground for bandwidth expansion

(B) Detailed land pattern with dimensions (+ 2 variables)

Detailed antenna land pattern diagram with labeled dimensions and variables a and b

Return loss measurement (variables a and b dependent)

Return loss (S11) measurement chart showing results dependent on variables a and b

Bandwidth Summary with PIFA type. Table-1

Case	New Bandwidth (S11)	Frequency Range
1 = 5mm, b=3.25mm, h-direction_1 PIFA	220 MHZ	2.32 ~ 2.54GHZ
a=3mm, b=2.25mm h-direction_3 PIFA	230MHz	2.32 ~ 2.55GHz