LC Duplexers
Comprised of inductors and capacitors, LC (lumped element) duplexers are compact and efficient passive components designed to enable simultaneous transmission and reception through a single antenna. By isolating transmit and receive frequency bands, they provide reliable performance with minimal interference, making them ideal for space-sensitive applications that require a balance of size, cost, and functionality.
LC Duplexers by MCV
MCV LC duplexers deliver solid electrical performance across both narrowband and broadband configurations. Available in rugged surface mount and connectorized packages, they are engineered for integration into compact RF systems operating in demanding environments such as wireless infrastructure, IoT devices, and portable communication equipment.
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FAQ about LC Duplexers
What is an LC duplexer?
An LC duplexer is a type of radio frequency (RF) duplexer that uses inductors (L) and capacitors (C) to form resonant circuits for filtering. It separates transmit (TX) and receive (RX) signals in devices that use a single antenna.
Where are LC duplexers commonly used?
LC duplexers are typically found in:
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Portable radios
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Handheld transceivers (walkie-talkies)
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Wireless modules
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Low- to medium-power communication systems
They’re ideal for applications where size, cost, and weight are critical.
How does an LC duplexer work?
LC duplexers use tuned LC filters to:
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Allow the transmit signal to pass to the antenna while blocking it from the receiver
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Allow the receive signal to pass from the antenna while blocking it from the transmitter
They work by creating frequency-selective paths using resonance principles.
What are the advantages of LC duplexers?
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Compact and lightweight
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Cost-effective
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Easier to integrate into small devices
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Tunable over a range of frequencies
What are the limitations of LC duplexers?
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Lower isolation compared to cavity or ceramic duplexers
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Less effective at handling high power
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More sensitive to temperature changes
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Narrower bandwidth
What frequency ranges are LC duplexers used for?
LC duplexers are used in a variety of bands including:
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VHF (30–300 MHz)
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UHF (300–1000 MHz)
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ISM bands (e.g., 433 MHz, 915 MHz, 2.4 GHz)
They are often customized for specific frequency applications.
Can LC duplexers be tuned or adjusted?
Yes, many LC duplexers are tunable by adjusting the values of the inductors and capacitors. However, in modern devices, they are often pre-tuned or integrated as part of a fixed PCB layout.
What is the typical isolation provided by an LC duplexer?
Isolation values vary but are generally 20–40 dB, which is sufficient for many low-power systems. This is much lower than cavity duplexers, which can exceed 80 dB.
How much power can an LC duplexer handle?
Most LC duplexers are designed for low to medium RF power levels—typically under 10–50 watts, depending on design and component quality. They are not suitable for high-power transmitters.
How do I choose the right LC duplexer for my system?
Key factors include:
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Operating frequency and bandwidth
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Required isolation
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Power handling capacity
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Size and form factor
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Environmental stability (temperature, vibration)
Also ensure it matches the impedance of your system (usually 50 ohms).
How can I order LC duplexers from MCV Microwave?
To place an order for LC duplexers please contact us and we will help you!