Antenna cables and connectors are the linchpins of radio frequency (RF) systems, ensuring efficient transmission and reception of signals. This comprehensive guide distills the essence of antenna cables and connectors, providing professionals with the knowledge necessary for optimal system performance.

Types of Antenna Cables

Coaxial Cables play a crucial role in signal transmission, and their quality directly impacts signal integrity.

RG316

A low-loss, FEP jacketed miniature coaxial cable capable of withstanding temperatures up to 200°C.

Superior shielding and low attenuation losses make it ideal for accessory/patch cable use.

• Electrical Specs: 50Ω resistance, 96pF/m capacitance, 0.79dB/m @ 850MHz signal loss.
• Mechanical Specs: 1.8kg/100m weight, 13mm minimum bend radius.

RG58U

The most common cable type, known for its flexibility and reasonable performance.

• Electrical Specs: 50Ω resistance, 0.46dB/m @ 850MHz signal loss.
• Mechanical Specs: Conductor diameter of 0.9mm, gas-injected FHDPE insulating material.

LMR195

A weatherproof high-performance alternative to RG58, with superior electrical shielding (90dB) and lower attenuation.

• Electrical Specs: 50Ω resistance, 0.36dB/m @ 850MHz signal loss.
• Mechanical Specs: 3.0kg/100m weight, -40° to +85°C operating temperature.

LMR400

The highest grade antenna cable, recommended for critical applications in harsh environments.

• Electrical Specs: 50Ω resistance, 0.12dB/m @ 850MHz signal loss.
• Mechanical Specs: 14.6kg/100m weight, 72mm minimum bend radius.

Importance of Antenna Connectors

Antenna connectors are vital for maintaining signal integrity and ensuring a reliable connection in RF systems. They bear the mechanical stress of securing the antenna to the RF assembly and undergo mating with other coaxial RF connectors on cables, amplifiers, PCBs, etc.

Types of Antenna Connectors

SMA Connector

• A 50Ω connector often found on the back of desktop modems and smaller antennas.
• Supports frequencies up to 18 GHz, 50Ω impedance.

BNC Connector

• One of the most common antenna connectors, primarily used in VHF/UHF systems.
• Offers good performance from DC to 4GHz, 50Ω or 75Ω resistance.

F Type Connector

• Primarily used for cable TV, HFC, set-top boxes, cable modems.
• 75Ω connector, good performance characteristics up to about 1GHz.

MMCX Connector

• A miniature version of the 50Ω MCX coaxial connector.
• Performs well between DC to 6GHz.

N Type Connector

• The 50Ω connector of choice for most high-quality antenna systems.
• Wide performance band – DC to 11GHz.

U.FL Connector

• Commonly used for internal antennas and PCI cards.
• Supports frequencies up to 6 GHz, 50Ω impedance.

Coaxial Cable Installation Tips

• Use 50 Ohm Cables: Prioritize 50 ohm versions of cables and antennas for best results.
• Minimize Cable Length: Keep coax cables as short as possible to reduce signal loss.
• Avoid Connection Points: Use one single long-length cable instead of adding connection points to minimize attenuation.
• Signal Loss Goal: Aim for a signal loss of fewer than 4 decibels for the entire cable run.
• Choose Low-Loss Cables: Opt for low-loss coaxial cables, even though they are more rigid and expensive.
• Avoid Coaxial Splitters: Do not use coaxial splitters with Wi-Fi and cellular antennas as it halves the power.

Antenna cables and connectors are indispensable in wireless communication systems. Understanding their specifications, types, and proper installation techniques is crucial for achieving optimal performance. This guide provides a comprehensive overview, equipping professionals with the insights needed to make informed decisions in their RF system designs.