Military Log Periodic Dipole Antennas for Wideband Directional Coverage
Author : Kajal Singh | Published On : 13 Nov 2026
A single boom gives a log-periodic dipole antenna a directional gain over a wide frequency range. This is important when a site is running over multiple channels and it is slow, expensive or impossible to change antennas for each channel. The trade off is the gain and pattern will shift across the band so the data sheet is more important than the name of the antenna.
If you are looking at a military log periodic dipole antenna manufacturer in India, start with the engineering questions, what frequencies you need, how much gain, what installation the antenna must withstand and what the published specifications of each model actually say.
How Does a Log Periodic Antenna Maintain Performance Across a Wide Band?
A log periodic antenna is constructed from a number of parallel dipoles of increasing length, mounted on a boom and fed alternately. The ratio of the length and spacing is constant, so the geometry repeats at a logarithmic scale.
At any frequency it is the dipoles of about half a wavelength in length which do most of the radiating. This is the active region. As frequency increases, the active region shifts toward the shorter elements; as frequency decreases, it shifts toward the longer elements. The elements work together to establish the antenna's directional pattern, while the active region shifts with frequency. This allows the LPDA to operate across its designed band without retuning for every frequency.
Performance is not identical at every frequency. Gain and beamwidth can vary across the band, while impedance and VSWR may fluctuate. Usable bandwidth is the range over which return loss and radiation pattern meet the link requirements. This can be narrower than the span quoted in a brochure. Check gain, pattern and VSWR at the frequencies you will actually use. Ideally you should have measured data.
Where Does an LPDA Fit in Military Communication Links?
The usual case is a directional link which needs to cover more than one frequency. If you’re a field team setting up a temporary site, you might need one antenna to work with multiple radios. A wideband directional antenna with predictable pointing characteristics can support monitoring and technical evaluation, including test-range work when its frequency coverage and radiation pattern suit the measurement.
These are general scenarios, not guarantees. Suitability depends on the operating band, polarisation, link budget, the installation environment and how the antenna connects to the rest of the system. A linear-polarised LPDA antenna is a poor match for a link expecting circular polarisation and not every design is appropriate for every communication, surveillance or electronic warfare task. Many links don’t. If your system does require polarisation diversity, have a look at our dual-polarised log periodic antenna range. Still considering this type or a Yagi? It is well covered in the log periodic versus Yagi antenna comparison.
What Should Buyers Check for Power Handling, Mounting and Rotators?
Begin with the numbers that a quotation is based on. Then check the frequency range and ask for gain and pattern across that and not just a peak number. Check the input impedance, VSWR or return loss and connector type. The antenna's polarisation should match the requirements at the other end of the link.
Power ratings need attention. Ask for continuous and peak values where the manufacturer provides them and see if they apply to the whole band. Feed-line loss works both ways: a long cable run sucks up transmit power and weakens what the radio receives, so plan cable type and routing early.
Mechanics decide whether the antenna survives its site. Compare dimensions, weight and wind loading with what the mast can carry and think about exposure to salt, dust, heat or ice. Leave room for installation access as well.
Then settle fixed vs rotated. A rotator lets you change pointing direction, but it adds weight, control wiring, mechanical complexity and maintenance. If the link bearing never changes, fixed mounting is simpler.
Before requesting a quotation, confirm:
- Required frequency range and operating conditions.
- Gain, radiation pattern and polarisation needs.
- Power rating and connector requirements.
- Mounting, wind loading and rotator requirements.
- Any applicable environmental or testing requirements.
- The model’s datasheet should settle the final decision.
Why Choose Antenna Experts?
Antenna Experts is an antennas manufacturer and supplier based in New Delhi. We match the antenna to your frequency range and installation, walk through the published specifications with you and discuss mounting, integration and environmental conditions. Begin with our military log periodic dipole antenna range.
If you have a requirement that is not covered by the listed models, send us the requirement and we will tell you straight up if we can support it. When comparing a military log periodic dipole antenna supplier in India with a manufacturer, request the same technical details from both.
Conclusion
An LPDA can give you directional coverage over a wide designed band but the right choice depends on your actual operating band, radiation pattern, gain, power level, mounting and environment.
To move forward, request log periodic antenna specifications and a quote from Antenna Experts.
