环形天线设计的rfPIC12F675

This application note describes the design of a single-
ended loop antenna for rfPIC12F675 transmitters. The
PCB design will cover al l 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 impedance. The
rfPIC12F675 uses fewer components, delivers almost
10 dB more output power to the antenna, and
increases the maximum frequency to 930 MHz.
AN868
Designing Loop Antennas for the rfPIC12F675
This application note also documents the tuning and
testing of the antenna design to avoid a manufacturing
Author: Myron Loewen
step for tuning. A picture of the finished board is shown
Microchip Technology Inc.
in Figure 1. For more details on RF regulatory limits
and compliance testing see Application Note AN242,