Ceramic Duplexers

Ceramic duplexers are commonly used in FDD (Frequency Division Duplexing) applications to separate the downlink and uplink signals to/from the antenna.

A key performance metric used in the selection of the duplexer is the degree of rejection.  Our duplexers can provide up to 70 dB of attenuation, as well as insertion loss below 1 dB, and power rating up to 60 watts.

ceramic duplexer

FAQ about Ceramic Duplexers

What is a ceramic duplexer?

A ceramic duplexer is a compact RF component that separates transmit and receive signals, allowing both to share a single antenna. It uses ceramic resonators based on piezoelectric principles to provide frequency selectivity and isolation between channels.

How does a ceramic duplexer work?

It operates by using highly selective bandpass filters made from ceramic materials. One filter allows only transmit signals to pass to the antenna, and the other allows only receive signals to reach the receiver, while preventing cross-interference.

What are the advantages of ceramic duplexers?

Ceramic duplexers are small, lightweight, and cost-effective. They offer good isolation and stable performance, making them ideal for space-constrained applications such as mobile devices, GPS units, and compact communication systems.

What frequency ranges do ceramic duplexers typically support?

They are generally designed for UHF and microwave frequency bands, often ranging from a few hundred MHz up to several GHz, depending on the application.

Where are ceramic duplexers commonly used?

Ceramic duplexers are widely used in wireless communication devices, cellular base stations, GPS receivers, and any system that requires duplex operation in a compact footprint.

What are the limitations of ceramic duplexers?

While efficient and compact, ceramic duplexers typically have lower power handling and isolation than cavity duplexers. They may also be more sensitive to temperature variations and mechanical stress.

What is insertion loss and how does it affect ceramic duplexer performance?

Insertion loss is the signal power lost as it passes through the duplexer. Higher insertion loss can reduce transmitter efficiency and degrade receiver sensitivity, so low insertion loss is critical in low-power or high-performance systems.

Can ceramic duplexers support full-duplex operation?

Yes, ceramic duplexers are commonly used in full-duplex systems where transmission and reception occur simultaneously on different frequencies. Their isolation performance determines how well self-interference is suppressed.

How does temperature affect a ceramic duplexer?

Temperature changes can cause slight frequency shifts in ceramic resonators. High-quality ceramic duplexers are designed with temperature-stable materials or compensation techniques to maintain consistent performance over the specified operating range.

Do ceramic duplexers require impedance matching?

Yes. Ceramic duplexers are typically designed for a standard 50-ohm system. Poor impedance matching between the duplexer, antenna, or RF circuitry can increase VSWR and reduce overall system efficiency.

What packaging options are available for ceramic duplexers?

Ceramic duplexers are available in surface-mount (SMD) packages for compact PCB designs, as well as shielded modules for improved isolation and reduced interference in more demanding RF environments.

What is the difference between a duplexer and a diplexer?

  • A duplexer separates transmit and receive signals on the same antenna, typically for full-duplex communication.

  • A diplexer separates or combines two different frequency bands, not necessarily for simultaneous transmission and reception.

What is the typical isolation provided by a ceramic duplexer?

Isolation between transmit and receive paths is typically 30 to 50 dB or higher, depending on the frequency and quality of the filter design.

How is a ceramic duplexer different from a cavity duplexer?

  • Ceramic duplexers are smaller, ideal for portable and embedded devices.

  • Cavity duplexers are larger and handle higher power, used in base stations and infrastructure.

What should I consider when selecting a ceramic duplexer?

Key specifications include:

  • Operating frequency range

  • Tx/Rx isolation

  • Insertion loss

  • VSWR (return loss)

  • Package size

  • Power handling

  • Temperature stability

How can I order ceramic duplexers from MCV Microwave?

To place an order for ceramic duplexers please contact us and we will help you!