Low-Temperature Co-Fired Ceramic (LTCC) filters are widely used in RF and microwave applications due to their excellent performance and miniaturization capabilities. The materials used in manufacturing LTCC filters include:

1. Ceramic Substrate (Glass-Ceramic Composite)

Primary Components: Alumina (Al₂O₃), silica (SiO₂), and glass-forming oxides (e.g., borosilicate glass).

Why Beneficial?

Low Sintering Temperature (~850–900°C): Allows co-firing with high-conductivity metals like silver (Ag) or gold (Au).

Thermal Stability: Maintains structural integrity under thermal stress.

Low Dielectric Loss (tan δ ~0.002–0.005): Enhances signal integrity at high frequencies.

2. Conductive Materials (Electrodes & Traces)

Silver (Ag), Gold (Au), or Copper (Cu):

Why Beneficial?

High Conductivity: Minimizes insertion loss in RF/microwave applications.

Compatibility with LTCC Processing: These metals do not oxidize excessively at LTCC sintering temperatures.

3. Dielectric Additives (For Tuning Properties)

TiO₂, BaTiO₃, or ZrO₂:

Why Beneficial?

Adjustable Permittivity (εᵣ ~5–50): Enables compact filter designs by controlling wavelength scaling.

Temperature Stability: Reduces frequency drift with temperature variations.

4. Organic Binders & Solvents (Temporary Processing Aids)

Polyvinyl Alcohol (PVA), Acrylics:

Why Beneficial?

Facilitates Tape Casting: Allows the ceramic to be formed into thin green tapes before firing.

Burn Out Cleanly: No residual ash after sintering.

Key Benefits of LTCC Filters:

Miniaturization: Multilayer integration reduces footprint.
High-Frequency Performance: Low loss and stable dielectric properties up to mmWave frequencies.
Thermal & Mechanical Robustness: Suitable for harsh environments (automotive, aerospace).
Design Flexibility: 3D structures with embedded passives (inductors, capacitors) are possible.

LTCC technology is favored in 5G, IoT, and satellite communications due to these material advantages.

Yun Micro, as the professional manufacturer of rf passive components, can offer the cavity filters up 40GHz,which include band pass filter, low pass filter, high pass filter, band stop filter.

Welcome to contact us: liyong@blmicrowave.com