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RF Filters

Image Part Number Description / PDF Quantity Rfq
FI212B245026-T

FI212B245026-T

TAIYO YUDEN

RF FILTER BAND PASS 2.45GHZ 0805

41119
FI105L250014-T

FI105L250014-T

TAIYO YUDEN

RF FILTER LOW PASS 2.45GHZ 0402

4080
FI168B5538FW-T

FI168B5538FW-T

TAIYO YUDEN

RF FILTER BAND PASS LTE/W-LAN 06

9880
FI105L186822-T

FI105L186822-T

TAIYO YUDEN

RF FILTER LOW PASS 1.81GHZ 0402

7796
FI168B2002H7-T

FI168B2002H7-T

TAIYO YUDEN

RF FILTER BAND PASS LTE-M/NB-IOT

9589
FI168H2593GG-T

FI168H2593GG-T

TAIYO YUDEN

RF FILTER HIGH PASS LTE 0603

20010
FI168B245001-T

FI168B245001-T

TAIYO YUDEN

RF FILTER BAND PASS 2.45GHZ 0603

4537
FI168L1681DT-T

FI168L1681DT-T

TAIYO YUDEN

RF FILTER LOW PASS LTE/NB-IOT

10000
FI168L1681G6-T

FI168L1681G6-T

TAIYO YUDEN

RF FILTER LO PASS 1.6815GHZ 0603

0
FI105B245024-T

FI105B245024-T

TAIYO YUDEN

RF FILTER BAND PASS 2.45GHZ 0402

16988
FI168B0845D9-T

FI168B0845D9-T

TAIYO YUDEN

RF FILTER BAND PASS LTE-M/NB-IOT

8053
FI212B190223-T

FI212B190223-T

TAIYO YUDEN

RF FILTER BANDPASS 1.907GHZ 0805

3079
FI212C245036-T

FI212C245036-T

TAIYO YUDEN

RF FILTER BALANCE 2.45GHZ 0805

0
FI168D087018-T

FI168D087018-T

TAIYO YUDEN

RF FILTER LOW PASS 1.34GHZ 0603

1320
FI212B245027-T

FI212B245027-T

TAIYO YUDEN

RF FILTER BAND PASS 2.45GHZ 0805

0
FI212B3600FM-T

FI212B3600FM-T

TAIYO YUDEN

RF FILTER BAND PASS LTE 0805

10000
FI168L2200G9-T

FI168L2200G9-T

TAIYO YUDEN

RF FILTER LOW PASS 2.2GHZ 0603

16809
FI168L0835M9-T

FI168L0835M9-T

TAIYO YUDEN

RF FILTER LOW PASS 829MHZ 0603

0
FI212C245075-T

FI212C245075-T

TAIYO YUDEN

RF FILTER BALANCE 2.45GHZ 0805

5994
FI168W1697B1-T

FI168W1697B1-T

TAIYO YUDEN

RF FILTR BANDPASS 1.6945GHZ 0603

8000

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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