RF Filters

Image	Part Number	Description / PDF	Quantity
	RFBPF1608060AA7M1U Walsin Technology	RF FILTER BANDPASS 2.4GHZ 0603	0
	B160KA1S Knowles DLI	BANDPASS	4
	LP0603N5500ANTR Elco (AVX)	RF FILTER LOW PASS 5.5GHZ 0603	0
	AE1542B9506 Anatech Electronics Inc.	1542 MHZ CAVITY BANDPASS FILTER	10
	XBF-183+	REFLECTIONLESS BAND PASS FILTER,	0
	RFBPF1608060K88Q1C Walsin Technology	RF FILTER BAND PASS 5.55GHZ 0603	0
	TTR36-3EE2 Telonic Berkeley Inc.	TUNABLE BAND REJECT (NOTCH) FILT	0
	XHF-581M+	REFLECTIONLESS HIGH PASS FILTER,	0
	DEA162450BT-1247B1 TDK Corporation	RF FILTER BAND PASS 2.45GHZ 0603	3801
	FI168H2593GG-T TAIYO YUDEN	RF FILTER HIGH PASS LTE 0603	20010
	DEA162690LT-5064A1 TDK Corporation	RF FILTER LO PASS 1.6945GHZ 0603	9302
$LP1206A3800ASTR\100$	LP1206A3800ASTR\100 Elco (AVX)	RF FILTER LOW PASS 3.8GHZ 1206	0
	LP0805A3500AWTR Elco (AVX)	RF FILTER LOW PASS 3.5GHZ 0805	0
	DEA202450BT-7210A1 TDK Corporation	RF FILTER BAND PASS 2.45GHZ 0805	0
	748111009 Würth Elektronik Midcom	WE-LPF SMT-MULTILAYER TIEFPASSFI	0
	AB1600B902 Anatech Electronics Inc.	1600 MHZ CAVITY BANDPASS FILTER	10
$LP1206A3200ASTR\100$	LP1206A3200ASTR\100 Elco (AVX)	RF FILTER LOW PASS 3.2GHZ 1206	0
	LBP.5410.Z.A.30 Taoglas	LTCC BAND PASS FILTER FOR 5410MH	4000
	DEA202450BT-7077A1 TDK Corporation	RF FILTER BAND PASS 2.45GHZ 0805	577
	BP0EA1950A7TR Elco (AVX)	RF FILTR BANDPASS 1.95GHZ 30ULGA	165

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

Type	Functional Characteristics	Application Examples
Bandpass Filter	Allows frequencies within a specific range	Cellular base stations, Wi-Fi routers
Low-pass Filter	Passes frequencies below cutoff frequency	Power amplifiers, GPS systems
High-pass Filter	Attenuates frequencies below cutoff frequency	Satellite communication systems
Band-reject Filter	Blocks specific frequency bands	Medical imaging equipment
SAW Filter	Uses surface acoustic waves for precise filtering	Smartphones, automotive radar
BAW Filter	Employs bulk acoustic resonators for high-frequency operation	5G mmWave devices, WLAN modules
Cavity Filter	Metallic resonant cavities for high Q-factor	Radio 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

Parameter	Description	Importance
Frequency Range	Operational bandwidth (e.g., 2.4-2.5 GHz)	Determines application compatibility
Insertion Loss	Signal attenuation in passband (e.g., <1.5 dB)	Impacts system sensitivity
Bandwidth (3dB)	Passband width at half-power points	Defines frequency selectivity
Rejection Ratio	Stopband attenuation level (e.g., >40 dB)	Interference suppression capability
Power Handling	Maximum input power (e.g., 20W CW)	Prevents component damage
Temperature Stability	Frequency 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

Manufacturer	Representative Product	Key Features
Murata Manufacturing	SAWLF5G30D	3.3-4.2 GHz BAW filter for 5G
Qorvo	QPM2515	2.3-2.7 GHz bandpass filter, 100W power rating
Skyworks Solutions	SKY13460	DC-6 GHz SPDT switch with integrated filters
Mini-Circuits	BFCN-1100+	Cavity filter with 1050-1300 MHz range
TE Connectivity	RFHF35-2.92M	High-frequency coaxial filter up to 40 GHz

7. Selection Guidelines

Key considerations:

Frequency Requirements: Match passband with system operating bands
Power Handling: Ensure ratings exceed maximum system power
Environmental Conditions: Temperature (-40 to +85 C), humidity resistance
Form Factor: SMD for compact designs vs. coaxial for high-power applications
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.