AS-800-3000

The AS-800-3000 is a professional-grade Dual Arm Archimedean Cavity Backed Spiral Antenna engineered for ultra-broadband performance across the 800–3000 MHz spectrum. This frequency-independent antenna is a critical asset for high-stakes missions requiring Circular Polarization (LHCP or RHCP) to mitigate multi-path fading and signal polarization shifts. Designed for precision directional transmission and reception, the AS-800-3000 is the definitive choice for Electronic Countermeasures (ECM), Signal Intelligence (SIGINT), and advanced direction-finding (DF) applications in both terrestrial and airborne environments.

Design: Wideband Directional Precision

The AS-800-3000 is meticulously crafted to maintain consistent, high-efficiency performance throughout its entire frequency spread. By utilizing an extended coaxial stubs technique, the antenna provides a constant 3 to 6 dBi gain while preserving a wide 60–80 degree half-power beamwidth. This wide-angle, directional radiation pattern allows for effective sector monitoring and scanning without the loss of signal sensitivity common in conventional antennas. Its cavity-backed design ensures all radiation is directed forward, providing high immunity to noise and a superior front-to-back ratio for precision surveillance and telemetry tasks.

Durability: Ruggedized Architectural Grade Engineering

Built for survival in severe environmental conditions, the AS-800-3000 is constructed from 6063T6 ultra-corrosion-resistant architectural anodized aluminum alloy. The internal radiating copper strips are sealed within this aluminum cavity and further protected by a high-strength fiberglass front cover, ensuring RF transparency and mechanical robustness. The unit is finished with a protective powder coating, rated for extreme winds up to 200 Km/Hr, and built to operate in temperatures from -30°C to +60°C, making it suitable for permanent outdoor installations, naval platforms, or high-speed airborne mounting.

Efficiency: Circular Polarization for Contested RF Environments

A standout feature of the AS-800-3000 is its use of Circular Polarization, available in Left Hand (LHCP) or Right Hand (RHCP) configurations. Circular polarization is essential in environments where signal "spin" or multi-path reflections (common in urban or mountainous terrain) cause traditional linear antennas to suffer from signal fading. With a power handling capacity of 150 Watts, this spiral antenna offers significantly higher efficiency than standard omni-directional or "rubber duck" antennas, providing a "dead-solid" link for wideband monitoring and high-speed data telemetry.

Technical Features

• Comprehensive 0.8–3 GHz Coverage: Continuous, wideband operation from 800 MHz to 3000 MHz in a single directional unit.
• Dual Arm Archimedean Design: Frequency-independent architecture ensures stable gain and VSWR (better than 2:1) across the entire band.
• Circular Polarization (LHCP/RHCP): Minimizes signal fading and multi-path interference; ideal for airborne and satellite links.
• Extended Coaxial Stubs Technique: Provides a constant 3+ dBi gain while maintaining wide horizontal and vertical beamwidths.
• High Power Handling: Capable of managing up to 150 Watts of RF power for transmission and ECM applications.
• Cavity Backed Shielding: Aluminum cavity housing ensures high immunity to noise and eliminates unwanted rear radiation.
• Aviation-Grade Materials: Built from 6063T6 aluminum alloy and high-strength fiberglass for ultimate structural integrity.
• Enhanced Mounting Hardware: Supplied with specialized brackets for poles (25.4mm to 51mm), with customized options available for mast or equipment mounting.
• Compact & Lightweight: Weighing only 2 Kgs with a 250mm diameter, it is ideal for man-portable, vehicular, and airborne deployments.
• Weatherproof Enclosure: Powder-coated finish and fiberglass cover ensure 24/7 reliability in severe environmental conditions.

SIGINT & Direction Finding Guide: Precision Signal Acquisition with AS-800-3000

In Signal Intelligence (SIGINT) and Electronic Countermeasures (ECM), the ability to intercept a signal on the first pass is the difference between mission success and tactical failure. The AS-800-3000 Archimedean spiral antenna is a "frequency-independent" tool designed to solve the two biggest problems in tactical RF monitoring: Polarization Mismatch and Multi-path Fading.

1. The Power of Circular Polarization (CP)

Most tactical radios, cellular towers, and drones use linear antennas (Vertical or Horizontal). However, when a signal reflects off a building, a hill, or the ground, its polarization "flips" or rotates.

• The Problem: If you use a vertical antenna to receive a signal that has rotated toward a horizontal plane, you can lose up to 20 dB (99%) of the signal strength.
• The AS-800-3000 Advantage: Because this antenna is Circularly Polarized (LHCP or RHCP), it captures energy from any linear orientation. Whether the target signal is vertical, horizontal, or slanted, the AS-800-3000 intercepts it with minimal loss. This is critical for Direction Finding (DF), where a steady signal is required to calculate a precise line-of-bearing.

2. Archimedean Spiral: Frequency Independence

Traditional antennas (like Yagis or Log Periodics) have specific "sweet spots" where they perform best. Outside of those narrow bands, their gain and VSWR fluctuate wildly.

• The Design: An Archimedean spiral is unique because its "active region" (the part of the antenna actually radiating) moves along the spiral arms as the frequency changes.
• The Tactical Benefit: From 800 MHz to 3000 MHz, the AS-800-3000 maintains a nearly constant impedance and radiation pattern. This means your SIGINT receiver won't experience "blind spots" as it sweeps through the spectrum. You get the same 3–6 dBi gain whether you are hunting for an 800 MHz LTE signal or a 2.4 GHz drone control link.

3. Cavity Backing for Directional Accuracy

A spiral antenna naturally radiates in two directions (forward and backward). In a SIGINT application, you only want to see what is in front of the vehicle or mast.

• The Shielding: The AS-800-3000 is Cavity Backed with 6063T6 aluminum. This reflects the backward-traveling energy forward, effectively doubling the gain and creating a clean 60–80 degree beamwidth.
• ECM Application: When used for jamming, the cavity ensures that high-power RF (up to 150 Watts) is directed strictly toward the target, protecting the operators and friendly electronics located behind the antenna from high-intensity RF exposure.

4. Wide-Angle Monitoring for Rapid Discovery

Narrow-beam antennas (like high-gain dishes) are like looking through a straw; they are excellent once you find the target but inefficient for searching a large area.

• The Search Advantage: With a 60–80 degree beamwidth, the AS-800-3000 acts like a "floodlight." It covers a massive sector of the horizon at once. In a Direction Finding array (often using 4 or 6 spirals), this allows for instantaneous 360-degree coverage, identifying the location of a threat the moment it keys its transmitter.

Tactical SIGINT Deployment Checklist

• Polarization Consistency: Ensure your array uses the same polarization (all LHCP or all RHCP). For most satellite and drone monitoring applications, LHCP is the preferred standard for multi-path rejection.
• Height & Obstruction: At 3 GHz, signals are strictly "Line-of-Sight." Even dense foliage can significantly attenuate the signal. Mount the AS-800-3000 as high as possible, using the fiberglass cover to protect the copper elements from salt spray or dust.
• Cable Loss: At the 3000 MHz end of the band, signal loss in the cable is significant. Keep the coaxial run between the antenna and the receiver as short as possible, and use high-quality LMR-400 or LMR-600 cables to preserve the gain.
• Mounting Stability: Use the supplied hardware for 25.4mm to 51mm poles. A vibrating mount can introduce phase noise into your SIGINT data, making it difficult to get an accurate location fix on a moving target.