Logarithmic Cycle Antenna

Introduction

The logarithmic cycle antenna is a non-frequency antenna, the so-called non-frequency variable means that the impedance, pattern, gain, standing wave ratio and other electrical characteristics of the antenna change periodically with the logarithm of the frequency, and remain basically unchanged in a wide frequency band.

Peculiarity

Logarithmic periodic antennas are mainly used in ultra-short wave bands, and can also be used as short-wave communication antennas and medium-wave and short-wave broadcast transmission antennas. High efficiency, close to launch expectations. Compared to other high-gain antennas, log-period antennas are more directiv, but have greater attenuation of unwanted directional signals and are frequency-independent antennas.

Merit

The logarithmic cycle antenna is constructed and operated similarly to the Yagi Uda antenna. The main advantage of this antenna is that it presents constant characteristics in the required operating frequency range. It has the same radiation resistance and therefore the same SWR. The gain and the before-to-after ratio are the same.

Usage

As an ultra-wideband antenna, the bandwidth coverage is very wide, the bandwidth can reach 10:1, often used for signal amplification, indoor distribution and elevator signal coverage. In addition, the logarithmic periodic antenna can be used as a feed source for microwave reflective surface antennas. Since the active region moves with the change of operating frequency, the deviation of the active region from the focus in the entire operating frequency band must be within the allowable tolerance of the entire operating frequency band during installation.

Function

Logarithmic cycle antenna is a kind of directional plate antenna, which is a wideband antenna often used for indoor distribution and elevator signal coverage. Logarithmic periodic antennas can be used to receive and transmit communication signals for communication transmission. There are many types of log-period antennas, including log-periodic dipole antennas and unipolar antennas, log-periodic resonant V-shaped antennas, logarithmic-periodic spiral antennas, etc., the most common of which is logarithmic-periodic dipole antennas.

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