LPDP-300-1000

The LPDP-300-1000 is a professional-grade Dual Polarized Log Periodic Dipole Antenna (LPDA) designed for wideband directional communication, spectrum monitoring, and high-power jamming across the 300–1000 MHz spectrum. This compact cross-element array captures or transmits both horizontal and vertical radio signals simultaneously via two independent 50-ohm ports. Optimized for military and government applications, it offers high-gain precision across the entire UHF band without the power losses associated with electrical loading.

Design: Wideband Polarization Mastery

The LPDP-300-1000 is engineered to eliminate the "polarization mismatch" common in urban and tactical environments.

• Simultaneous E & H Processing: Featuring 2 x N-Female input terminations, the antenna allows for concurrent handling of vertical and horizontal signals. This provides true polarization diversity, ensuring no signal is lost due to multipath fading or transmitter orientation.
• No-Loading Efficiency: By utilizing full-sized radiating elements rather than electrical loading, the LPDA maintains a consistent 8+ dBi gain and high efficiency across the entire 300-1000 MHz range.
• Fast Tactical Deployment: The antenna features foldable elements and a rear-end mounting arrangement, allowing for rapid installation on masts up to 52mm without the need for non-metallic isolated poles.

Construction: Industrial Hardening & Stability

Built for survival in extreme environments, the internal array is constructed from 6063T6 ultra-corrosion-resistant architectural anodized aluminum alloy.

• Mechanical Durability: Extra spacers are used between the support booms to improve structural integrity. All metal surfaces are finished with an epoxy-based olive green powder coating to resist salt spray, UV, and corrosive gases.
• Integrated Protection: The entire system operates at D.C. ground, providing an integrated low-resistance path for lightning protection and suppressing atmospheric static for a high-sensitivity "quiet" noise floor.
• Marine-Grade Hardware: All screws, nuts, and bolts are made of high-quality stainless steel, ensuring total corrosion resistance for coastal and shipboard applications.

Reliability: 250W Multi-Mission Power

With a 250 Watt power handling capacity, the LPDP-300-1000 is a robust radiator for continuous-duty jamming and high-capacity data links. The 16 dB Front-to-Back ratio ensures maximum energy is focused on the target while minimizing self-interference. Its compact weight of under 4 Kgs and high wind rating of 200 Km/Hr make it ideal for both permanent rooftop installations and mobile tactical masts.

Technical Features

• Dual-Polarized Cross-Element Geometry: Simultaneous capture of all signal polarizations.
• Elite 300–1000 MHz Bandwidth: Covers military UHF, Aviation, GSM, and LTE bands in a single unit.
• High-Efficiency 8+ dBi Gain: Focused 70-degree beamwidth for precise signal targeting.
• 250W Continuous Duty Power: Engineered for electronic countermeasures (ECM) and strategic transmission.
• D.C. Grounded Shielding: Integrated lightning protection and high noise immunity for SIGINT.
• Foldable Tactical Elements: Segmented design for streamlined logistics and rapid field assembly.
• Marine Grade Stainless Hardware: All fasteners resist coastal and industrial corrosion.
• Compact 700mm Length: Ideal for space-constrained mobile platforms and rooftops.
• Rear Mounting Clamp: Fits up to 52mm (2-inch) pipe; eliminates radiation pattern distortion from the mast.
• 6063T6 Aluminum Construction: Anodized and powder-coated for 20+ year environmental survival.

EW & Monitoring Guide: Urban Multipath & Polarization Diversity

In the 300–1000 MHz spectrum—which hosts critical military UHF, public safety, and cellular bands—the LPDP-300-1000 provides a decisive advantage. In dense urban or complex terrains, signals rarely maintain their original polarization, making a single-polarized antenna a liability.

1. Defeating Urban Multipath Fading

In a city, UHF signals bounce off glass, steel, and concrete. Each reflection can rotate the signal's polarization or shift its phase.

• The "Null" Problem: A vertical whip antenna may experience a signal drop of up to 20–30 dB if the incoming wave has rotated horizontally. This results in "picket fencing" or total signal loss.
• The Diversity Solution: By monitoring both the Vertical and Horizontal ports of the LPDP-300-1000, a SIGINT system can perform Maximum Ratio Combining (MRC). When the signal "fades" on the vertical plane, it almost always "peaks" on the horizontal plane.

2. High-Power Jamming Success Rate (ECM)

To successfully jam a frequency-hopping target in the 300–1000 MHz range, you must saturate the victim's receiver regardless of their antenna orientation.

• Saturating the "E" and "H" Planes: If your jammer is only vertically polarized, an adversary can often maintain a link through "cross-polarization leakage" or by simply tilting their antenna.
• 250W Total Coverage: Feeding power into both ports of the LPDP-300-1000 ensures that the target radio is hit with high-intensity noise on every possible vector, leaving no "clean" orientation for them to receive data.

3. SIGINT Mode & Source Identification

The ability to see both polarizations simultaneously allows an operator to "fingerprint" the source of a transmission:

• Vertical Dominance: Typically indicates mobile tactical units, handheld "walkie-talkies," or maritime vessels.
• Horizontal/Mixed Dominance: Often points to fixed-site point-to-point links, television/data relays, or signals that have traveled long distances and undergone significant ionospheric rotation.

4. Directional Precision & Site Protection

The 70-degree beamwidth of the LPDP-300-1000 acts as a precision "floodlight" for the UHF band.

• Target Concentration: Instead of wasting 250W in all directions, this antenna concentrates the energy into a narrow sector, exponentially increasing the Jamming-to-Signal (J/S) ratio.
• Front-to-Back Isolation: The 16 dB F/B ratio is vital for the safety of the EW team. it ensures that the high-power jamming signal is directed away from friendly command-and-control (C2) receivers located behind the antenna.

Tactical SIGINT Deployment Checklist