INDUSTRY COMPONENT

Reflectors (in some SAW designs)

Reflectors in SAW filters are metallic structures that reflect acoustic waves to create specific frequency responses in bandpass filters.

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Component Specifications

Definition
Reflectors in Surface Acoustic Wave (SAW) filter designs are precisely patterned metallic electrodes deposited on piezoelectric substrates. They function by reflecting acoustic waves at specific points along the propagation path, creating constructive and destructive interference patterns that define the filter's frequency characteristics. These components are critical for achieving sharp roll-off, low insertion loss, and precise bandwidth control in RF and microwave applications.
Working Principle
Reflectors operate based on the principle of acoustic wave reflection at impedance discontinuities. When a SAW propagates along the piezoelectric substrate and encounters a metallic reflector pattern, part of the wave energy reflects back due to the mechanical and electrical boundary conditions. Multiple reflectors are arranged in periodic or weighted arrays to create standing wave patterns that selectively pass or reject specific frequency bands through interference effects.
Materials
Aluminum (Al) or aluminum-copper alloys (Al-Cu) with thicknesses of 100-200 nm, deposited on lithium niobate (LiNbO₃) or lithium tantalate (LiTaO₃) piezoelectric substrates. Gold (Au) may be used for high-reliability applications.
Technical Parameters
  • Pitch 0.8-2.0 μm (λ/2 to λ)
  • Aperture 20-100 λ
  • Reflectivity 0.7-0.95 per reflector
  • Number of Fingers 50-200 per reflector
  • Temperature Coefficient -40 to -80 ppm/°C
  • Insertion Loss Contribution 0.1-0.5 dB
Standards
IEEE 176, IEC 60122, MIL-STD-883

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Reflectors (in some SAW designs).

SAW reflector acoustic wave reflector bandpass filter component RF filter design piezoelectric substrate metallization pattern frequency control surface acoustic wave technology Reflectors (in some SAW designs) Reflectors (in some SAW designs) in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Filter (Bandpass/SAW)

An electronic component that selectively passes signals within a specific frequency range while attenuating others, used in receiver circuits.

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Engineering Analysis

Risks & Mitigation
  • Metal migration under high power
  • Substrate cracking from thermal stress
  • Contamination during fabrication
  • Frequency drift with temperature changes
FMEA Triads
Trigger: Electromigration in thin metal films
Failure: Increased insertion loss and degraded frequency response
Mitigation: Use aluminum-copper alloys, implement current density limits, and apply protective coatings
Trigger: Piezoelectric substrate defects
Failure: Spurious responses and reduced stopband rejection
Mitigation: Implement strict incoming material inspection and use double-polished substrates

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.1% frequency tolerance, ±0.05 μm pattern accuracy
Test Method
Network analyzer measurements (S-parameters), laser interferometry for displacement, SEM for pattern verification

Buyer Feedback

★★★★☆ 4.7 / 5.0 (9 reviews)

"As a professional in the Computer, Electronic and Optical Product Manufacturing sector, I confirm this Reflectors (in some SAW designs) meets all ISO standards."

"Standard OEM quality for Computer, Electronic and Optical Product Manufacturing applications. The Reflectors (in some SAW designs) arrived with full certification."

"Great transparency on the Reflectors (in some SAW designs) components. Essential for our Computer, Electronic and Optical Product Manufacturing supply chain."

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Frequently Asked Questions

What is the difference between reflectors and transducers in SAW filters?

Transducers convert electrical signals to acoustic waves and vice versa, while reflectors only reflect acoustic waves without energy conversion. Reflectors shape the frequency response through interference patterns.

How do reflector patterns affect filter performance?

Reflector pitch determines the center frequency, while the number and weighting of reflectors control bandwidth, sidelobe suppression, and roll-off characteristics. Optimized patterns minimize insertion loss and improve selectivity.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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