Transmission Line: Frequency Range DC to 18 GHz, VSWR <1.5:1

Component Specifications

Definition

A transmission line in a matching network is a specialized conductor system designed to efficiently transfer radio frequency (RF) or microwave signals between components while maintaining impedance matching. It functions as a controlled impedance pathway that minimizes signal reflection, power loss, and electromagnetic interference in high-frequency circuits. These lines are engineered with precise geometric configurations to achieve specific characteristic impedances (typically 50Ω or 75Ω) and propagation characteristics essential for optimal RF performance.

Working Principle

Transmission lines operate based on distributed circuit theory where electrical parameters (inductance, capacitance, resistance, conductance) are distributed along their length rather than lumped at discrete points. When properly terminated with matching impedance, they allow electromagnetic waves to propagate with minimal reflection. The working principle involves maintaining a consistent characteristic impedance (Z₀ = √(L/C)) along the line's length through controlled physical dimensions and material properties, enabling efficient power transfer while preventing standing waves that would degrade system performance.

Materials

Copper or silver-plated copper conductors with PTFE (Teflon) or ceramic dielectric insulation; aluminum or brass outer shielding; gold-plated connectors for corrosion resistance

Technical Parameters

Parameter	Typical range	Notes & selection driver
VSWR	<1.5:1
Connector Type	SMA, N-Type, BNC
Insertion Loss	<0.5 dB/m at 10 GHz
Power Handling	Up to 500W average
Frequency Range	DC to 18 GHz
Operating Temperature	-55°C to +125°C
Shielding Effectiveness	>90 dB
Characteristic Impedance	50Ω or 75Ω

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 61196, MIL-PRF-39012

Engineering Analysis

Risks & Mitigation

Impedance mismatch causing signal reflection
Dielectric breakdown at high voltages
Connector corrosion in humid environments
Mechanical fatigue from vibration

FMEA Triads

Trigger: Improper connector installation
Failure: Increased VSWR and signal loss
Mitigation: Use torque wrenches for proper tightening; implement connector inspection procedures

Trigger: Dielectric contamination
Failure: Reduced breakdown voltage and increased loss
Mitigation: Maintain cleanroom assembly; use sealed connectors in harsh environments

Trigger: Mechanical stress from improper routing
Failure: Impedance variation and eventual breakage
Mitigation: Follow minimum bend radius specifications; use proper cable strain relief

Compliance & Inspection

Tolerance

Impedance tolerance ±2%, dimensional tolerance ±0.1mm

Test Method

Time Domain Reflectometry (TDR) for impedance verification; network analyzer for S-parameter measurement; VSWR testing per MIL-STD-202

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Transmission Line

12 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Neway Valve (Suzhou) Co., Ltd.

Suzhou, Jiangsu, CN

Also makes: Power Plant, Transmission Lines, Control Valve and 9 more