RF Directional Coupler

Part Number	Description / PDF	Quantity
ADC-10-4+	10.5 DB SMT DIRECTIONAL COUPLER,	0
EHF-FD1540 Panasonic	RF DIR COUPLER 800MHZ-1GHZ 0603	1122
DBTC-9-4X+	9 DB SMT DIRECTIONAL COUPLER, 5	0
C1015J5003AHF Anaren	RF DIR COUPLER 1GHZ-1.5GHZ 0805	0
MACPCT0030 Metelics (MACOM Technology Solutions)	RF DIR COUPLER 5MHZ-1.2GHZ 6SMD	0
XC0900A-03S Anaren	RF DIR COUPLER 811MHZ-1GHZ SMD	12435
DBTC-7-152+	7 DB SMT DIRECTIONAL COUPLER, 10	0
CP0402A1950BLTR Elco (AVX)	RF DIR COUPLER 1.9GHZ 0402	0
CP0805A0836CWTR Elco (AVX)	RF DIR COUPLER 824-849MHZ 0805	0
CP0603A1747DWTR Elco (AVX)	RF DIR COUPLR 1.71-1.785GHZ 0603	0
DBTC-12-4+	12.2 DB SMT DIRECTIONAL COUPLER,	0
CP0805A0902CWTR Elco (AVX)	RF DIR COUPLER 890-915MHZ 0805	0
DC0710J5005AHF Anaren	RF DIR COUPLER 700MHZ-1GHZ 0805	0
TFSC06054125-2113A1 TDK Corporation	RF DIR COUPLER 2.4GHZ-2.5GHZ SMD	3880
CP0603A2442ALTR Elco (AVX)	RF DIR COUPLER 2.4-2.484GHZ 0603	0
CP0603A0836AWTR Elco (AVX)	RF DIR COUPLER 824-849MHZ 0603	0
C0810J5003AHF Anaren	RF DIR COUPLER 800MHZ-1GHZ 0805	21311
CP0603A2100BLTR Elco (AVX)	RF DIR COUPLER 2.1GHZ 0603	0
CP0603A1880BLTR Elco (AVX)	RF DIR COUPLER 1.85-1.91GHZ 0603	0
DC2327J5005AHF Anaren	RF DIR COUPLER 1.7-2.2GHZ 0805	0

RF Directional Coupler

1. Overview

Directional couplers are passive devices that sample a portion of RF/IF signal power for monitoring or feedback purposes. They enable signal splitting, reflection measurement, and signal-to-noise ratio optimization. These components are critical in wireless communication systems, RFID infrastructure, and industrial control applications.

2. Major Types and Functional Classification

Type	Functional Features	Application Examples
Microwave Ridge Waveguide	High power handling (100W+), broadband operation	5G Base stations, Satellite communication
Coaxial Line	Compact design, 50/75 impedance options	RFID readers, Test equipment
Microstrip Planar	Low profile, Surface-mount compatible	WLAN routers, IoT modules
Hybrid Coupler	3dB power split with phase matching	MIMO systems, Beamforming networks

3. Structure and Components

Typical construction includes: - Precision-machined metal housing (aluminum/copper alloys) - Dielectric substrates (PTFE or ceramic materials) - Coupling slots/apertures (0.1-2.0mm dimensions) - Input/Output ports with SMA/N-Type connectors - Isolation termination resistor (50 matched load) - EMI shielding gaskets

4. Key Technical Specifications

Parameter	Typical Range	Importance
Coupling Factor	3-40 dB	Determines sampled power level
Directivity	15-40 dB	Measures forward/reverse signal separation
Insertion Loss	0.1-2.0 dB	Impacts system power efficiency
VSWR	1.1:1 - 1.5:1	Affects impedance matching quality
Frequency Range	30 MHz - 110 GHz	Defines operational bandwidth

5. Application Fields

Key industries include: - Telecommunications (5G/4G BTS signal monitoring) - RFID systems (UHF/NFC reader sensitivity control) - Industrial IoT (Wireless sensor network optimization) - Medical equipment (MRI RF power management) - Automotive (V2X communication diagnostics)

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Analog Devices	ADL5523	40GHz broadband, 20dB coupling accuracy
Mini-Circuits	ZFDC-20-63-S+	DC-20GHz, 3.5mm connectorized
TE Connectivity	RF-0424-01	Automotive-grade RFID coupler
KRYTAR	10104800	10-48GHz, 50dB dynamic range

7. Selection Guidelines

Key considerations: - Frequency bandwidth match (1.5x operating range) - Power handling (1.2x maximum system power) - Directivity requirements (>30dB for precise measurements) - Environmental factors (operating temperature -40 C to +85 C) - Connector type compatibility (SMA vs N-Type) - Cost vs performance tradeoff (planar vs waveguide)

8. Industry Trends

Emerging developments: - Sub-6GHz massive MIMO integration - Advanced packaging for mmWave applications - AI-optimized coupling algorithms - Gallium Nitride (GaN) material adoption - Miniaturization for mobile device integration - Higher directivity (>50dB) research