Bandpass/SAW Filter for Receiver Circuits

Product Specifications

Technical details and manufacturing context for Filter (Bandpass/SAW)

Definition

A filter, specifically a bandpass or surface acoustic wave (SAW) filter, is a critical component within the Receiver (RX) Block of communication and electronic systems. Its primary role is to isolate and extract the desired signal frequency band from incoming radio frequency (RF) signals while rejecting unwanted frequencies, noise, and interference. This ensures signal integrity, improves signal-to-noise ratio, and prevents adjacent channel interference in the receiver chain. Bandpass filters use combinations of inductors, capacitors, and sometimes resistors to create a frequency-selective network that allows a specific range of frequencies to pass. SAW filters utilize piezoelectric materials (like quartz or lithium niobate) where an input electrical signal is converted into a mechanical surface acoustic wave via interdigital transducers (IDTs). This wave propagates across the substrate, and its characteristics (like velocity and attenuation) are frequency-dependent. The wave is then converted back into an electrical signal at the output IDTs, effectively filtering the signal based on the transducer geometry and substrate properties. Typical parameters include center frequency (315–915 MHz), bandwidth (1–10 MHz), insertion loss (1.5–3.5 dB), passband ripple (0.5–1.5 dB), stopband rejection (30–50 dB), impedance (50 Ω), operating temperature (-40–85 °C), power handling (0.5–2 W), package size (3.0×3.0–5.0×5.0 mm), mounting type (SMD), moisture sensitivity level (1–3 per IPC/JEDEC J-STD-020), and RoHS compliance (100% per EU Directive 2011/65/EU). These values are directory reference ranges and must be confirmed for the specific model and application. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

Bandpass filters use combinations of inductors, capacitors, and sometimes resistors to create a frequency-selective network that allows a specific range of frequencies to pass. SAW filters utilize piezoelectric materials (like quartz or lithium niobate) where an input electrical signal is converted into a mechanical surface acoustic wave via interdigital transducers (IDTs). This wave propagates across the substrate, and its characteristics (like velocity and attenuation) are frequency-dependent. The wave is then converted back into an electrical signal at the output IDTs, effectively filtering the signal based on the transducer geometry and substrate properties.

Common Materials

Piezoelectric substrate (e.g., quartz, lithium niobate, lithium tantalate), Aluminum or gold electrodes (for IDTs), Ceramic or metal packaging

Technical Parameters

Parameter	Typical range	Notes & selection driver
Center Frequency	315–915 MHz	Select according to application band
Bandwidth	1–10 MHz	Defines passband width
Insertion Loss	1.5–3.5 dB	Lower is better for signal integrity
Passband Ripple	0.5–1.5 dB	Uniformity within passband
Stopband Rejection	30–50 dB	Attenuation outside passband
Impedance	50 Ω	Matching to system
Operating Temperature	-40–85 °C	Performance may degrade outside range
Power Handling	0.5–2 W	Maximum input power
Package Size	3.0×3.0–5.0×5.0 mm	Footprint for PCB layout
Mounting Type	SMD	Surface mount for automated assembly
Moisture Sensitivity Level	1–3 MSL	Higher requires stricter handlingIPC/JEDEC J-STD-020
RoHS Compliance	100 %	Lead-free and hazardous substance freeEU Directive 2011/65/EU

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

Components / BOM

Piezoelectric Substrate Part
Generates and propagates surface acoustic waves when an electric field is applied via IDTs

Material: Quartz, lithium niobate, or lithium tantalate
Interdigital Transducers (IDTs) Part
Convert electrical signals to mechanical surface waves (input) and vice versa (output)

Material: Aluminum or gold
Reflectors (in some SAW designs) Part
Reflect surface waves to create resonant structures or improve filter characteristics

Material: Aluminum or gold
Packaging/Casing Part
Protects the delicate substrate and IDTs from environmental factors and provides electrical connections

Material: Ceramic or metal
Inductors and Capacitors Optional
Form the resonant network on LC-type bandpass builds, where no acoustic wave is involved.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Receiver (RX) Block

View system integration details

Manufacturers of Filter (Bandpass/SAW)

Manufacturer profiles associated with Filter (Bandpass/SAW).

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What is the typical center frequency range for this filter?

The directory lists a center frequency range of 315–915 MHz. However, the exact center frequency must be selected according to the application band and confirmed with the manufacturer for the specific model.

What does insertion loss indicate?

Insertion loss is the signal power loss introduced by the filter in the passband. Lower values are better for signal integrity. The directory range is 1.5–3.5 dB, but the actual value depends on the specific filter model.

What is the difference between bandpass and SAW filters?

Bandpass filters use lumped components like inductors and capacitors to create a frequency-selective network. SAW filters use piezoelectric substrates and interdigital transducers to convert electrical signals to acoustic waves, which are frequency-dependent. Both serve to pass a specific frequency band and reject others.

What standards apply to this filter?

The directory lists moisture sensitivity level per IPC/JEDEC J-STD-020 and RoHS compliance per EU Directive 2011/65/EU. These are reference standards; actual compliance must be verified with the manufacturer for the specific product.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric (hermetically sealed package)
other spec:	Frequency range: 100 MHz to 3 GHz, Insertion loss: <3 dB, Attenuation: >30 dB out-of-band, Impedance: 50 Ω
temperature:	-40°C to +85°C (operational), -55°C to +125°C (storage)

Filter (Bandpass/SAW)

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards