What are the types of duplexer?

What are the types of duplexer?

There are two predominant types of duplexer in use – “notch duplexers”, which exhibit sharp notches at the “unwanted” frequencies and only pass through a narrow band of wanted frequencies and “bandpass duplexers”, which have wide-pass frequency ranges and high out-of-band attenuation.

What is duplexer in microwave?

Duplexer is a microwave switch, which connects the Antenna to the transmitter section for transmission of the signal. The Radar cannot transmit the signal during reception time. In this way, Duplexer isolates both transmitter and receiver sections.

What is a duplexer used for?

A duplexer is a three port filtering device which allows transmitters and receivers operating at different frequencies to share the same antenna.

What important contribution does a duplexer have in a microwave system?

Important properties of a duplexer are: Low loss between transmitter and antenna in transmit (less than 1 dB is desirable) High isolation from transmitter to receive in transmit (as much as 80 dB for megawatt systems) Low loss between antenna and receiver in receive (less than 1 dB is desirable)

What do you mean by duplexer?

A duplexer is a device that allows bi-directional communication over a single channel. In radio communications systems, it isolates the receiver from the transmitter while permitting them to share a common antenna. Most radio repeater systems include a duplexer.

Which type of transmission line is used in duplexer?

The “Branch duplexer” is a transmit-receive switch, which consists of matched line segments. These matched line segments are short-circuited by gas discharge tubes or pin diodes, and conduct the high-frequency energy to the desired radar devices.

Is duplexer an active device?

A duplexer is a passive device that allows bi-directional (duplex) communication of transmit and receive frequencies within the same band over a single path.

What is the meaning of duplexer?

: a switching device that permits alternate transmission and reception with the same radio antenna.

Is duplexer an amplifier?

The module includes a power amplifier, which is a second generation of TriQuint’s SiGe-based CDMA power amplifiers, utilizing Atmel’s SiGe technology for CDMA and a surface acoustic wave (SAW) duplexer, that is a second generation of Sawtek’s CDMA SAW-based duplexers. …

Do I need a duplexer?

Simplest answer is that a duplexer is needed when you plan to use the same antenna for simultaneous transmitting and receiving. If you can use two antennas and separate them vertically or horizontally far enough, you don’t need a duplexer.

What is cavity duplexer?

Surpris- ingly, a duplexer cavity is simply two carefully tuned resonate circuits! Electrically they are very simple. One tuned circuit sets the pass band, the other sets the frequency of the notch.

Is duplexer an oscillator?

The duplexer could be a switch, a circulator, or a diplexer, as described in Chapter 4. A transmitter generally consists of an oscillator, a modulator, an upconverter, filters, and power amplifiers. To have a low phase noise, the oscillator or local oscillator can be phase locked to a low-frequency crystal …

When do you need a duplexer for two way communication?

In two-way communication, if we are supposed to use the same Antenna for both transmission and reception of the signals, then we require Duplexer. Duplexer is a microwave switch, which connects the Antenna to the transmitter section for transmission of the signal.

How is a duplexer used in a radio repeater?

A duplexer is an electronic device that allows bi-directional ( duplex) communication over a single path. In radar and radio communications systems, it isolates the receiver from the transmitter while permitting them to share a common antenna. Most radio repeater systems include a duplexer.

What’s the difference between a duplexer and a diplexer?

Diplexer versus Duplexer Simply put, a duplexer separates a transmit and receive path based on signal direction and can be used for same frequency signals, and a diplexers separates signals based on frequency with filters. Their operation is not interchangeable, and a diplexer could not replace a duplexer in common circuits.

What is the frequency range of a duplexer?

Frequency domain. Duplexers are commonly made for use on the 30-50 MHz (“low band”), 136-174 MHz (“high band”), 380-520 MHz (“UHF”), plus the 790–862 MHz (“800”), 896-960 MHz (“900”) and 1215-1300 MHz (“1200”) bands.