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

555 Fm Circuit Circuit
SEM/STEM detectors and CRTs
555 timer voltage controlled oscillator
bluetooth based smart home
ic speech
ATR0981 ATR0981 UHF SiGe Front-end IC
AVR robots
Experimental Pendulum Clock
6 Battery Tesla Switch Power Mosfet Uses No Schottky Power Diodes
Alternately flashing one of a plurality of sets of high-power lights a chain circuit
As one of the thyristor type delay circuit
Extend current application circuit



Top