Log Periodic Antenna Advantages And Disadvantages

21 Nov, 2023

The log periodic antenna is a multi-element antenna that helps build up a stable and good wireless communication system in a wide range of frequencies. It has found applications in a variety of fields, including telecommunications, amateur radio, and even military communications. Then, in this post, the author will write the log periodic antenna advantages and its disadvantages to let you have a basic knowledge of the log periodic antenna.

What is A Log Periodic Antenna?

In the previous post, the author illustrated the definition of the log periodic antenna. It is a directional antenna engineered to operate over a wide band of frequencies.

It is characterized by its geometric structure, which consists of a series of dipole elements of varying lengths arranged in a repeating pattern. These elements are typically arranged in a way that creates a logarithmic periodicity in their lengths, giving the antenna its name.


Log Periodic Antenna

Advantages of Log Periodic Antenna

The log periodic antenna has several outstanding benefits, making it a popular choice in various applications. Here are the main benefits of the log periodic antenna:

●Wide Bandwidth

One of the key advantages of log periodic antennas is their ability to cover a broad range of frequencies. Unlike other antennas, which are designed for specific frequency bands, log periodic antennas can operate across multiple bands. This feature makes them highly versatile and cost-effective, as a single log periodic antenna can replace several antennas designed for different frequency ranges. With its high operation efficiency across a broad spectrum, the mimo log periodic antenna.

●Easy to Achieve 10:1 Bandwidth

With its universal design, the log periodic antenna relatively easily achieves a 10:1 bandwidth.

●Easy to Achieve Low to Moderate Gains

The geometry of the antenna elements is carefully designed to maximize gain, making them efficient at receiving and transmitting signals over long distances. The mimo log periodic antenna allows the operator to adjust the frequency range, so the log periodic antenna gain the operator gets can range from low to moderate.

●Two Radiation Patterns

Thanks to the universal structure design, the log periodic antenna pattern had developed into two patterns ---- uni-directional and bi-directional radiation patterns. This versatility allows them to adapt to specific needs, such as long-range communication or multi-directional reception.

●Versatile Frequency Usage

The log periodic antenna is adaptable for HF (High Frequency), VHF (Very High Frequency), and UHF (Ultra High Frequency) communication, as well as TV reception. This versatility makes them suitable for a wide range of applications, from amateur radio to broadcasting.

●Wide Variety of Shapes

To meet the various installation conditions, the log periodic antenna also be developed into a wide variety of shapes. Also, a log periodic antenna manufacturer supports the customization service in the shapes of the log periodic antenna. For example, XJS has an independent production line and a professional engineering team to ensure the OEM/ODM orders.

●Two-Way Communication

Log periodic antenna is particularly useful for two-way communication systems that require the use of multiple frequencies. They can efficiently transmit and receive signals across different frequency bands, making them a practical choice for various scenarios.

11dbi Log Periodic Antennas

11dbi Log Periodic Antennas

Disadvantages of Log Periodic Antenna

After long-term uses, the log periodic antenna gradually shows its drawbacks. Here are the main drawbacks:

●Complex Design and Construction

Due to its wide service frequency ranges, the log periodic antenna requires more elements for the purpose of accepting and sending signals. And, the log periodic antenna is more complex to design and construct compared to simpler antennas like dipole or monopole antennas. This complexity can make them more expensive and challenging to manufacture.

●Narrow Beamwidth

Although the log periodic antenna serves a wide frequency range, it has a narrower beamwidth compared to other types of antennas, such as yagi antennas. This means they have a smaller field of view, making it important to aim them accurately at the desired target.

9dbi log periodic antenna design


9dbi Log Periodic Antenna Design

●Assembly and Maintenance

The assembly and maintenance of the log periodic antenna may be more complex and time-consuming due to the multiple elements and precise spacing required. Moreover, to ensure stable and accurate signal acceptance and sending, you need to put effort into regular maintenance.

●Wind Load

As above mentioned, the outdoor log periodic antenna is equipped with multiple elements, which may easily be susceptible to wind loading, especially in areas with strong winds. This may require additional structural considerations and support during installation.


Finally, the log periodic antenna is a valuable tool for various wireless communication projects, particularly when a wide bandwidth and directional gain are required. When you start to build up a communication project, you should first consider the advantages and disadvantages of a log periodic antenna and evaluate whether is suitable for your projects.

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