Characteristics of LMR300 RF coaxial cable

LMR-300 RF coaxial cable is a low-loss, ultra-flexible RF feeder cable, and its core characteristics are summarized as follows:
Feature dimension Specific parameters/characteristics
Characteristic impedance: 50 ohms
Overall dimensions: Outer diameter approximately 7.62mm (0.300 inch), inner conductor diameter 1.78mm
Low loss performance: Small signal attenuation: 0.20 dB/m (0.9GHz); 0.30 dB/m (2.0GHz)
Transmission rate: 82% – 85% (depending on the sheath material)
Shielding effectiveness > 90dB, utilizing a dual-layer shielding structure consisting of “foil + braided mesh”
Flexibility: Super soft, with a small minimum bending radius, making it easy to route wires in confined spaces
Operating temperature: -40°C to +85°C
Applicable frequency: DC – 6 GHz, with support up to 11GHz
Material and structure
Conductor: The inner conductor is typically solid bare copper, but there are also stranded copper versions (such as LMR-300-UF) available for flexible wiring.
Insulation layer: Foamed polyethylene (FPE) is used, which is the key to achieving low loss.
Sheath options: The standard model is made of black polyethylene (PE), suitable for regular and outdoor environments. Additionally, flame retardant (FR) versions (compliant with shaft ratings) and ultra-flexible (UF) versions are available for selection.
Application scenarios
With its low loss and high shielding performance, LMR-300 is commonly used in antenna feeder systems in mobile communication base stations, GPS, maritime communications, radar systems, and high-frequency electronic equipment.