Band-Pass Filter for Wireless Modules

Product Specifications

Technical details and manufacturing context for Band-Pass Filter

Definition

A band-pass filter is a component used in wireless radio modules to selectively allow signals within a designated frequency band to pass through while rejecting unwanted frequencies. It is essential for ensuring clean signal transmission and reception in wireless communication systems by isolating the desired channel from interference. The filter's design establishes specific cutoff frequencies that define the passband, allowing signals within this range to pass with minimal attenuation while significantly attenuating signals outside this band. Typical applications include RF front-ends, transceivers, and test equipment. The filter is constructed on a ceramic substrate with copper traces and dielectric materials, providing stable performance across a range of environmental conditions. Key parameters include center frequency (selectable from 100 to 3000 MHz), bandwidth (5–20% of center frequency), insertion loss (≤3 dB at center frequency), passband ripple (≤1 dB within passband), stopband rejection (≥40 dB at ±2× center frequency), impedance (50 Ω nominal), power handling (1–10 W CW, depending on frequency), operating temperature (-40 to 85 °C), connector type (SMA female, 50 Ω), dimensions (20×12×6 mm typical), and weight (≤10 g typical). These values are directory reference ranges and must be confirmed for the actual model and application. The filter is a passive component, requiring no external power. It is important to verify model-specific specifications and standards with the legal manufacturer or supplier before procurement or integration.

Working Principle

The band-pass filter utilizes resonant circuits, typically LC combinations, or transmission line structures to create frequency-selective characteristics. The design sets specific cutoff frequencies that define the passband. Signals within this range pass with minimal attenuation, while signals outside are significantly attenuated. The filter's impedance is nominally 50 Ω, matching common RF systems. The resonant elements are fabricated on a ceramic substrate with copper traces, and the dielectric material influences the frequency response. The filter's performance is characterized by parameters such as insertion loss, passband ripple, and stopband rejection, which are verified through network analysis. The operating principle ensures that only the desired frequency band is transmitted, reducing interference and improving signal integrity.

Common Materials

Ceramic Substrate, Copper Traces, Dielectric Material

Technical Parameters

Parameter	Typical range	Notes & selection driver
Center Frequency	100–3000 MHz	Selectable within range
Bandwidth	5–20 % of center frequency	Relative to center frequency
Insertion Loss	≤3 dB	At center frequency
Passband Ripple	≤1 dB	Within passband
Stopband Rejection	≥40 dB	At ±2× center frequency
Impedance	50 Ω	Nominal
Power Handling	1–10 W	CW, depends on frequency
Operating Temperature	-40–85 °C	Full performance
Connector Type	SMA	Female, 50 Ω
Dimensions	20×12×6 mm	Typical, varies with frequency
Weight	≤10 g	Typical

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

Resonator Elements Part
Create resonant frequencies that define the filter's passband characteristics

Material: Copper/Dielectric Composite
Input/Output Coupling Structures Part
Transfer signals into and out of the filter with proper impedance matching

Material: Copper Traces
Substrate Part
Provides mechanical support and electrical insulation for filter components

Material: Ceramic or Laminated Dielectric

Applied To / Applications

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

Wireless Radio Module

View system integration details

Manufacturers of Band-Pass Filter

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

Chengdu Leader Microwave Technology Co., Ltd.

Beijing, CN

Also makes: Low-Noise Amplifier, Power Amplifier, Low-Pass Filter and 2 more

Listed on the company's own website · profile compiled by CNFX from public sources

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Frequently Asked Questions

What is the typical insertion loss of this band-pass filter?

The insertion loss is specified as ≤3 dB at the center frequency. This is a reference value; actual performance may vary with frequency and model. Always check the datasheet for the specific part.

Can this filter handle high power levels?

The power handling is rated at 1-10 W continuous wave (CW), depending on frequency. For high-power applications, verify the exact rating for your frequency and ensure proper thermal management.

What connector type is available?

The filter is available with SMA female connectors, which are 50 Ω impedance. This is a common interface for RF testing and integration. Confirm connector type and gender for your application.

How do I select the correct center frequency and bandwidth?

Center frequency is selectable within 100-3000 MHz, and bandwidth is 5-20% of center frequency. Choose based on your system's required passband. Consult the manufacturer's selection guide or datasheet for available options.

Data Basis

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

Preliminary Technical Classification

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pressure:	Atmospheric to 1.5 bar
other spec:	Frequency range: 1 MHz to 10 GHz, Insertion loss: <3 dB, VSWR: <2:1
temperature:	-40°C to +85°C

Band-Pass Filter

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards