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RF Filters

Image Part Number Description / PDF Quantity Rfq
LFD181G57DP5B910

LFD181G57DP5B910

TOKO / Murata

RF FILTER SIGNAL 1.57GHZ 4SMD

0
LFD212G45DP3A188

LFD212G45DP3A188

TOKO / Murata

RF FILTER SIGNAL CONDITION 0805

0
LFD21892MDP2B860

LFD21892MDP2B860

TOKO / Murata

RF FILTER SIGNAL CONDITION 0805

0
LDD211G4003A-087

LDD211G4003A-087

TOKO / Murata

RF FILTER SIGNAL 1.4GHZ 0805

0
LDD211G7503A-067

LDD211G7503A-067

TOKO / Murata

RF FILTER SIGNAL 1.75GHZ 0805

0
LDD211G6203A-086

LDD211G6203A-086

TOKO / Murata

RF FILTER SIGNAL 1.62GHZ 0805

0
LFL21836MTC1A045

LFL21836MTC1A045

TOKO / Murata

RF FILTER SIGNAL CONDITION 0805

0
LFL15620MTC1C037

LFL15620MTC1C037

TOKO / Murata

RF FILTER LOW PASS 620MHZ 0402

0
LFL215G78TC1A155

LFL215G78TC1A155

TOKO / Murata

RF FILTER SIGNAL CONDITION 0805

0
LFL182G45TC3B746

LFL182G45TC3B746

TOKO / Murata

RF FILTER LOW PASS 2.45GHZ 0603

0
LFL211G84TC1A005

LFL211G84TC1A005

TOKO / Murata

RF FILTER SIGNAL CONDITION 0805

0
LFL183G55TC2B908

LFL183G55TC2B908

TOKO / Murata

RF FILTER SIGNAL CONDITION 0603

0
LFL211G74TC1A022

LFL211G74TC1A022

TOKO / Murata

RF FILTER SIGNAL CONDITION 0805

0
LFL21915MTC1A027

LFL21915MTC1A027

TOKO / Murata

RF FILTER LOW PASS 915MHZ 0805

0
LQZ02HQ242A02E

LQZ02HQ242A02E

TOKO / Murata

RF FILTER TRAP Z2.4GHZ=460OH SMD

14230
LFL212G45TC1A023

LFL212G45TC1A023

TOKO / Murata

RF FILTER SIGNAL CONDITION 0805

0
LFL211G96TC1A042

LFL211G96TC1A042

TOKO / Murata

RF FILTER SIGNAL CONDITION 0805

0
LFL182G54TC1B838

LFL182G54TC1B838

TOKO / Murata

RF FILTER LOW PASS 2.54GHZ 0603

0
LFD21868MMF1D386

LFD21868MMF1D386

TOKO / Murata

RF FILTER BALANCE 891.5MHZ 0805

0
LFL151G81TC1B786

LFL151G81TC1B786

TOKO / Murata

RF FILTER SIGNAL CONDITION 0402

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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