The Loop on Ground (LoG) Antenna: A Compact Solution for Directional Reception

The Loop on Ground (LoG) antenna offers a compact solution for directional reception with a cardioid radiation pattern. This article explores its design and highlights the efficiency achieved through the Conformal Method of Moments (CMoM).

The Loop on Ground (LoG) antenna is a small yet efficient antenna primarily used for reception purposes, featuring a cardioid-shaped radiation pattern in the horizontal plane. This innovative design includes a 110 Ω resistor connected at the top of the loop, with the antenna terminals positioned at the bottom. One terminal is connected to the ground through a vertical wire, forming a monopole. This clever arrangement allows the antenna to maintain its directionality despite its compact size.

The accompanying image illustrates the radiation patterns achieved with and without grounding.

Specifications for the LoG Antenna Configuration:

• Frequency: 4.5 MHz
• Loop Diameter: 1 m
• Height Above Ground: 2 m (average real ground)

The application of the Conformal Method of Moments reveals a remarkable feature of the LoG antenna model: it can be accurately represented using only a minimal number of segments. This efficiency is achieved through the use of curved segments that precisely conform to the loop’s contour. The provided image showcases these curved segments, which enable an effective simulation of the antenna’s behavior. This advantageous characteristic is a result of the antenna’s small size relative to the wavelength.

In conclusion, the Loop on Ground (LoG) antenna is a compact yet directional antenna with a cardioid-shaped radiation pattern. By incorporating a monopole and grounding, this design achieves its distinctive characteristics, making it a valuable tool for reception applications.

See Also:

Precision Simulations with AN-SOF for Magnetic Loop Antennas