What is Archimedean spiral antenna?

The Archimedean spiral antenna is a popular of frequency independent antenna. Previous wideband array designs with variable element sizes (WAVES) have used the Archimedean spiral antenna as the radiating element.

What is the frequency range of spiral antenna?

Spiral antenna arrays are used in military aircraft in the 1-18 GHz range. Other applications of spiral antennas include GPS, where it is advantageous to have RHCP (right hand circularly polarized) antennas.

How does a spiral antenna work?

Spiral antennas transmit circularly polarized radio waves, and will receive linearly polarized waves in any orientation, but will drastically attenuate circularly polarized signals received with the opposite-rotation.

Why use spiral antenna?

The spiral is the most widely used of these antennas because of its compact form factor and generally superior performance characteristics. Spiral antennas have nearly constant input impedance and are capable of VSWR below 2:1 over more than a decade of bandwidth.

How does a biconical antenna work?

Biconical antennas, sometimes called bicons, are essentially two cones touching points with a common central axis. Each cone applies excitation at its vertex, or point. These components may be driven by electronic charges, potentials, or alternating magnetic fields and currents at the vertex.

How does a helical antenna work?

Helical antenna or helix antenna is the antenna in which the conducting wire is wound in helical shape and connected to the ground plate with a feeder line. It is the simplest antenna, which provides circularly polarized waves. It is used in extra-terrestrial communications in which satellite relays etc., are involved.

What is the gain of loop antenna?

The designed loop antenna is self-matched to the 50-ohm impedance of a source and provides a high directional gain of 8.2 dBi. The antenna gain is increased to 10.0 dBi by using a dual multi-loop geometry.

How is loop antenna calculated?

The formulas for calculating the approximate length of a full-wave loop antenna are: Full-wave loop in feet = 1005 / frequency in MHz. Full-wave in meters = 306 / frequency in MHz.