loop antenna design

Loop Antenna Design For Rfpic12f675KAN868
Designing Loop Antennas for the rfPIC12F675
Author: Myron Loewen Microchip Technology Inc. This application note also documents the tuning and testing of the antenna design to avoid a manufacturing step for tuning. A picture of the finished board is shown in Figure 1. For more details on RF regulatory limits and compliance testing see Application Note AN242, “Designing an FCC Approved ASK rfPIC Transmitter.”

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INTRODUCTION

This application note describes the design of a singleended loop antenna for rfPIC12F675 transmitters. The PCB design will cover all 3 frequency bands from 290 MHz through 930 MHz with a few component value changes. The previous Microchip RF transmitters had balanced outputs which required twice as many components to bias the power amplifier and match impedanc