A rhombic antenna consists of one to several parallel wires suspended above the ground in a "rhombus" (diamond) shape. Long versions are typically supported by a pole or tower at each vertex to which the wires are attached by insulators. Each of the four sides is the same length.

The rhombic has one of the poorest gain-per-acre rankings of any high gain HF antenna array. On the other hand a rhombic antenna does have the very distinct advantage of working over very wide frequency ranges with good SWR and gain, something a basic monoband Yagi can never do.

A rhombic antenna is a type of travelling wave antenna which utilizes the principle of travelling wave radiator. It consists of 4 conducting long wires connected in the form of rhombus or diamond. The complete antenna structure is placed horizontally above the surface of the ground.

The Rhombic Antenna is an equilateral parallelogram shaped antenna. Generally, it has two opposite acute angles. The tilt angle, θ is approximately equal to 90° minus the angle of major lobe. Rhombic antenna works under the principle of travelling wave radiator.

The rhombic is made of 4 wires of length L in a rhomboid shape in the horizontal plane (see fig 1). It is symmetrical around the long side of the antenna. Good symmetry is of vital importance for the performance of this antenna. The width of the antenna's main lobe is determined by the angles q and a, often referred to as tilt and apex angle.

Every step along our path through traveling-wave antennas has led us to new heights of gain per unit of wire length (as measured in wavelengths)--and to narrower beamwidths. The final steps take us to the pinnacle of long-wire development: the rhombic antenna.

Nov 2, 2024 · The Rhombic is an equilateral parallelogram shaped antenna, it has two opposite acute angles. The tilt angle, θ is approximately equal to 90° minus the angle of major lobe. Rhombic antenna works under the principle of a fast traveling wave antenna.

Dec 16, 2023 · Rhombic antenna is a broadband directional antenna which was invented by Edmond Bruce and Harald Friis in 1931 and was considered king in that decade and the next. It is a broadband antenna which can operate at a wide range of frequencies.

These specifications cover the construction of a one wire rhombic receiving antenna. A total of 7 sizes of antennas have been designed for operation over various distance ranges at 4~ to 22 megacycles as shown in Table 1. With the exception of the side wire length "L" ~ …

The highest development of the long-wire antenna is the RHOMBIC ANTENNA (see figure 4-37). It consists of four conductors joined to form a rhombus, or diamond shape. The antenna is placed end to end and terminated by a noninductive resistor to produce a uni-directional pattern.