915-MHz antenna monopole

Posted on Aug 2, 2012

The Tab antenna is a folded monopole that you miniaturize by forming it into an inverted L with a downward bend at the end (Figure 1). You can solder it perpendicular to a pc board or build it as part of a pc board and place it at a corner. The folded section transforms the 12.5Ω radiation resistance to 50Ω and provides second-harmonic suppression. Third-harmonic suppression comes from an open stub near the base of the antenna.

915-MHz antenna monopole
Click here to download the full size of the above Circuit.

Detailed NEC-2 modeling explores the sensitivity to changes in the dimensions and optimized harmonic suppression. Because NEC models wire antennas in a vacuum and the Tab antenna is built on FR-4, you must incorporate the dielectric properties of the diel

Leave Comment

characters left:

New Circuits



Popular Circuits

10w 225-400mhz linear amplifier
Motor driver L298 Circuit Schematic Diagram
timer 555 schematic
Battery Meter for Pinball Machines
lamp dimmer circuit
short circuit protection for balanced
1w led driver
Loop Control Automatic Reversing Circuit
Stereo balance indicator
Simple Morning Alarm Circuit Using LDR and UM66
lights 5GM168 control circuit diagram
Cascode - common collector amplifier