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RF Filters

Image Part Number Description / PDF Quantity Rfq
L254XF3S

L254XF3S

Knowles DLI

RF FILTER LOW PASS 25.4GHZ 6SMD

88
B096QC2S

B096QC2S

Knowles DLI

RF FILTER BAND PASS 10GHZ 8SMD

83
L117XH4W

L117XH4W

Knowles DLI

11.7GHZ WIRE BOND LOW-PASS FILTE

25
B144MB1S

B144MB1S

Knowles DLI

BANDPASS

32
B042OD4S

B042OD4S

Knowles DLI

RF FILTER 4.25GHZ BANDPASS 2SMD

74
B111NC4S

B111NC4S

Knowles DLI

BANDPASS

19
AEQ05194-10

AEQ05194-10

Knowles DLI

RF FILTER GAIN EQUALIZER

0
L185XF4W

L185XF4W

Knowles DLI

18.5GHZ WIRE BOND LOW-PASS FILTE

19
H168XHXS

H168XHXS

Knowles DLI

HIGH PASS

42
AEQ3042-10

AEQ3042-10

Knowles DLI

RF FILTER GAIN EQUALIZER 2SMD

0
B149MC1S

B149MC1S

Knowles DLI

BANDPASS

8
B012MD5S

B012MD5S

Knowles DLI

RF FILTER BANDPASS 1.227GHZ 6SMD

9
B105MB5S

B105MB5S

Knowles DLI

BANDPASS

10
B168MB1S

B168MB1S

Knowles DLI

BANDPASS

21
B031ND5S

B031ND5S

Knowles DLI

RF FILTER 3.125GHZ BANDPASS 2SMD

0
B285LA0S

B285LA0S

Knowles DLI

BANDPASS

0

RF Filters

1. Overview

RF Filters are passive components that selectively allow or block specific frequency ranges in radio frequency (RF) systems. They are critical for signal integrity in wireless communication by eliminating interference, enhancing signal clarity, and ensuring compliance with regulatory standards. Modern applications include 5G networks, Wi-Fi systems, radar, and IoT devices.

2. Main Types and Functional Classification

TypeFunctional CharacteristicsApplication Examples
Bandpass FilterAllows frequencies within a specific rangeCellular base stations, Wi-Fi routers
Low-pass FilterPasses frequencies below cutoff frequencyPower amplifiers, GPS systems
High-pass FilterAttenuates frequencies below cutoff frequencySatellite communication systems
Band-reject FilterBlocks specific frequency bandsMedical imaging equipment
SAW FilterUses surface acoustic waves for precise filteringSmartphones, automotive radar
BAW FilterEmploys bulk acoustic resonators for high-frequency operation5G mmWave devices, WLAN modules
Cavity FilterMetallic resonant cavities for high Q-factorRadio astronomy, military communication

3. Structure and Components

Typical RF filter structures include:

  • Resonant Elements: Determine passband frequencies (e.g., quartz crystals in SAW filters)
  • Transmission Lines: Microstrip or coplanar waveguides for signal propagation
  • Dielectric Materials: Substrates like alumina or LTCC for impedance control
  • Enclosure: Metal housing for EMI shielding (cavity filters) or surface-mount packages
  • Ports: Input/output connectors (SMA, N-type) or PCB pads

Advanced designs integrate MEMS tuning mechanisms or LTCC multilayer structures for miniaturization.

4. Key Technical Specifications

ParameterDescriptionImportance
Frequency RangeOperational bandwidth (e.g., 2.4-2.5 GHz)Determines application compatibility
Insertion LossSignal attenuation in passband (e.g., <1.5 dB)Impacts system sensitivity
Bandwidth (3dB)Passband width at half-power pointsDefines frequency selectivity
Rejection RatioStopband attenuation level (e.g., >40 dB)Interference suppression capability
Power HandlingMaximum input power (e.g., 20W CW)Prevents component damage
Temperature StabilityFrequency drift vs temperature (e.g., 50 ppm/ C)Ensures operational reliability

5. Application Fields

  • Telecommunications: 5G NR base stations, fiber optic networks
  • Aerospace: Avionics navigation systems, satellite transponders
  • Medical: MRI RF coils, ultrasound imaging equipment
  • Automotive: V2X communication modules, 77GHz radar systems
  • Industrial: Wireless sensor networks, RFID readers

6. Leading Manufacturers and Products

ManufacturerRepresentative ProductKey Features
Murata ManufacturingSAWLF5G30D3.3-4.2 GHz BAW filter for 5G
QorvoQPM25152.3-2.7 GHz bandpass filter, 100W power rating
Skyworks SolutionsSKY13460DC-6 GHz SPDT switch with integrated filters
Mini-CircuitsBFCN-1100+Cavity filter with 1050-1300 MHz range
TE ConnectivityRFHF35-2.92MHigh-frequency coaxial filter up to 40 GHz

7. Selection Guidelines

Key considerations:

  1. Frequency Requirements: Match passband with system operating bands
  2. Power Handling: Ensure ratings exceed maximum system power
  3. Environmental Conditions: Temperature (-40 to +85 C), humidity resistance
  4. Form Factor: SMD for compact designs vs. coaxial for high-power applications
  5. Cost vs. Performance: Trade-off between ceramic filters (low-cost) and cavity filters (high-stability)

Case Study: Selecting a BAW filter for 5G mmWave devices requires <0.5 dB insertion loss, 28 GHz operation, and compliance with 3GPP TS 38.141-1 standards.

8. Industry Trends and Future Outlook

Key development trends:

  • Higher Frequency Operation: mmWave filters for 5G/6G (24-100 GHz) using photonic bandgap structures
  • Miniaturization: Wafer-level packaging reducing SAW filter size to 0.4x0.2 mm
  • Integrated Solutions: Filter+LNA modules for IoT devices (e.g., Qorvo's QM33013)
  • Advanced Materials: Lithium niobate on silicon (LiNoSi) substrates improving temperature stability
  • Software-Defined Radio: Tunable RF filters with MEMS or ferroelectric materials

The market is projected to grow at 9.8% CAGR (2023-2030), driven by automotive radar and satellite internet demand.

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