Passive Shielded Loop Antenna

Featured Product from A.H. Systems Inc.

Passive Loop Antenna SAS-563P
The SAS-563P electrostatic shielded loop antenna is typically used for shielding effectiveness testing per IEEE 299, MIL-STD 285 and NSA 65-6 as well as many other test standards. This passive 12" (30cm) diameter loop antenna is shielded against the electric component by enclosing the conducting loop within an all-metal shield. This balanced faraday shield ensures that it is producing (or measuring) just the magnetic component of the radiated energy. Due to the relatively long wavelengths in this band, and the typical test distance from the source, the 377 Ohm relationship to the E-field will not hold true and you may have to measure (or produce) the "E" field separately with a high impedance monopole antenna.

Loop Antennas 20 Hz - 30 MHz
A.H. Systems manufactures a wide variety of loop antennas in the frequency range of 20 Hz to 30 MHz. Loop antennas are primarily used to measure the magnetic field strength at lower frequencies. The small size of these loop antennas has the advantage of convenience in handling, availability of a zero- response orientation, and a simple expression for the voltage produced by a given field strength. At higher frequencies, about above 100 MHz, a loop of practical size may no longer be electrically small and has a significant response to the electric field as well as the magnetic field.
Whether used in a set to measure shielding effectiveness per MIL-STD 285 and NSA 65-6 or individually to satisfy specific requirements, the Loop Antenna is an efficient, low cost solution.

Here is a pdf version of our product catalog.

Articles, Test Guides and Webinars

Welcome to A.H. Systems, inc.
A.H. Systems has been established since 1974 and manufactures a complete line of affordable, reliable, EMI test equipment. Our individually calibrated EMI Test Antennas, Preamplifiers, Current Probes and Low-Loss Cables satisfy many test standards including CISPR, MIL-STD, FCC, EN, VDE, IEC and SAE. With a wide variety of mounting configurations, we can also offer tripods and accessories that compliment other EMI testing equipment used to complete your testing requirements. We are also committed to providing all of our clients with no cost prompt and professional technical support. Manufacturing high quality products at competitive prices with immediate shipment plus prompt technical support are our goals to improve the quality of your testing requirements.

Useful formulas for RF related conversions
Frequently used conversion factors, how they are derived, and why they are used. If you need to convert from one series of units to another for any reason, this is the tech. note for you. Typical EMC Related Formulas

View our other RF Conversion formula sheets: