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RF Filters

Image Part Number Description / PDF Quantity Rfq
LP0EA0082A700

LP0EA0082A700

Elco (AVX)

SIGNAL CONDITIONING 82 MHZ SIZE

0
LP0805H2400ASTR

LP0805H2400ASTR

Elco (AVX)

LOW PASS FILTER

0
HF0BA1840A700

HF0BA1840A700

Elco (AVX)

SIGNAL CONDITIONING 1840 MHZ SIZ

28
LP0AA1680A700

LP0AA1680A700

Elco (AVX)

SIGNAL CONDITIONING 1680 MHZ SIZ

35
LP0805A2700ASTRNOK

LP0805A2700ASTRNOK

Elco (AVX)

LOW PASS FILTER

0
LP0DA0107A700

LP0DA0107A700

Elco (AVX)

SIGNAL CONDITIONING 107 MHZ SIZE

21
BP0EA2620A7TR

BP0EA2620A7TR

Elco (AVX)

RF FILTR BANDPASS 2.62GHZ 30ULGA

0
LP0603A1000ANTR

LP0603A1000ANTR

Elco (AVX)

LOW PASS FILTER

0
HF0AA6380A700

HF0AA6380A700

Elco (AVX)

SIGNAL CONDITIONING 6380 MHZ SIZ

35
HF0BA1390A700

HF0BA1390A700

Elco (AVX)

SIGNAL CONDITIONING 1390 MHZ SIZ

28
LP0805A0800AWTR

LP0805A0800AWTR

Elco (AVX)

LOW PASS FILTER

0
LP0AA0209A700

LP0AA0209A700

Elco (AVX)

SIGNAL CONDITIONING 209 MHZ SIZE

35
LP0805A2100ASTR

LP0805A2100ASTR

Elco (AVX)

LOW PASS FILTER

0
LP1EA0500A700

LP1EA0500A700

Elco (AVX)

SIGNAL CONDITIONING 500 MHZ SIZE

24
LP0805H0700ASTR

LP0805H0700ASTR

Elco (AVX)

LOW PASS FILTER

0
LP0AA4210A700

LP0AA4210A700

Elco (AVX)

SIGNAL CONDITIONING 4210 MHZ SIZ

35
BP0EA1980A700

BP0EA1980A700

Elco (AVX)

RF FILTR BANDPASS 1.98GHZ 30ULGA

0
HF0AA4270A700

HF0AA4270A700

Elco (AVX)

SIGNAL CONDITIONING 4270 MHZ SIZ

0
LP0AA0327A700

LP0AA0327A700

Elco (AVX)

SIGNAL CONDITIONING 327 MHZ SIZE

35
LP0AA0145A700

LP0AA0145A700

Elco (AVX)

SIGNAL CONDITIONING 145 MHZ SIZE

35

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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