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Difference Between 1.85MM 2.4MM 2.92MM 3.5MM & SMA Connectors

RF connectors play a crucial role in modern communication and electronics. They serve as vital components for transmitting RF signals within electronic devices, ensuring the stability, reliability, and performance of signal transmission. Among numerous RF connectors, SMA, 2.92mm, 2.4mm, 1.85mm, and 3.5mm connectors each possess unique characteristics and application areas. In this article, we will address some Q&A about these connectors to help you gain a deeper understanding.

First, let’s get a brief understanding of the definitions and characteristics of these connectors.

SMA Connector

The SMA connector, initially developed by the US military, hence “SMA” stands for “SubMiniature version A.” Sometimes referred to as “SubMiniature version A” connector, it operates within the frequency range of DC to 18 GHz, commonly used for connecting small RF devices such as Wi-Fi equipment and antenna systems. Known for its robust structure, it is suitable for thinner RF cables and is often paired with the same type of SMA connector or RP-SMA connector (reverse gender version).

sma connector Interface sizes tandard
SMA connector Interface sizes tandard

2.92mm Connector

The 2.92mm connector, also known as “K connector,” operates within the frequency range of DC to 40 GHz. It boasts excellent high-frequency characteristics and low insertion loss, suitable for high-frequency applications such as microwave communication and aerospace components. It is typically paired with 2.92mm or 3.5mm connectors.

2.92mm connector Interface sizes tandard
2.92mm connector Interface sizes tandard

2.4mm Connector

The 2.4mm connector operates within the frequency range of DC to 50 GHz. It offers exceptional high-frequency characteristics and low insertion loss, suitable for high-frequency and high-power applications such as radar systems and satellite communication. It is commonly paired with 2.4mm or 3.5mm connectors.

2.4mm connector Interface sizes tandard
2.4mm connector Interface sizes tandard

1.85mm Connector

The 1.85mm connector, also known as “V connector,” operates within the frequency range of DC to 67 GHz. It possesses outstanding high-frequency characteristics and low insertion loss, suitable for even higher frequency applications such as millimeter-wave communication and antenna arrays. It is often paired with 1.85mm or 2.92mm connectors.

1.85mm connector Interface sizes tandard
1.85mm connector Interface sizes tandard

3.5mm Connector

The 3.5mm connector operates within the frequency range of DC to 34 GHz. It features excellent high-frequency characteristics and low insertion loss, suitable for high-frequency and high-power applications such as laboratory measurement equipment and microwave testing. It is typically paired with 3.5mm or 2.92mm connectors.

3.5mm connector Interface sizes tandard
3.5mm connector Interface sizes tandard

Difference

The table below compares the differences between 1.85mm, 2.4mm, 2.92mm, 3.5mm, and SMA connectors based on key parameters.

differences between 1.85mm, 2.4mm, 2.92mm, 3.5mm, and SMA connectors

Compatibility

1.85mm, 2.4mm, 2.92mm, 3.5mm, and SMA connectors, while different, are compatible and can be used together, as shown in the image below.

1.85,2.4mm,3.5 mm, 2.92 mm and SMA Connector Compatibility

FAQS

While these connectors have different characteristics, here are some Q&A I’ve compiled to help you gain a deeper understanding of these RF connectors.

Q: What is the difference between SMA connectors and RP-SMA connectors?

A: SMA connectors and RP-SMA connectors have opposite genders – SMA connectors are male, while RP-SMA connectors are female. Therefore, they are not compatible and cannot be directly connected. It’s important to ensure the correct selection of connectors to match the equipment when using them.

Q: What frequency ranges are suitable for 2.92mm connectors and 3.5mm connectors?

A: The 2.92mm connector is suitable for the frequency range of DC to 40 GHz, while the 3.5mm connector is suitable for the frequency range of DC to 34 GHz. Therefore, the 2.92mm connector is suitable for a higher frequency range, making it suitable for higher-frequency applications.

Q: Why is the 1.85mm connector suitable for millimeter-wave communication?

A: The 1.85mm connector is suitable for the frequency range of DC to 67 GHz, with excellent high-frequency characteristics, making it suitable for high-frequency applications such as millimeter-wave communication. Its performance characteristics make it an ideal choice in the field of millimeter-wave communication.

Q: What are the similarities between the 2.4mm connector and the 2.92mm connector?

A: Both the 2.4mm connector and the 2.92mm connector are high-performance microwave connectors suitable for high-frequency applications. They exhibit excellent high-frequency characteristics and low insertion loss. They are commonly used to connect equipment and systems requiring high-frequency transmission.

Q: Why is it necessary to use 2.4mm or 2.92mm connectors in microwave communication systems instead of the common SMA connectors?

A: Microwave communication systems often need to handle higher frequency signals, thus requiring higher performance connectors. The 2.4mm and 2.92mm connectors can support higher frequency ranges and have lower insertion loss, making them more suitable for microwave communication systems.

Q: What are the application areas for 3.5mm connectors?

A: 3.5mm connectors are suitable for high-frequency and high-power applications, such as laboratory measurement equipment, microwave test systems, and communication devices requiring high-frequency transmission. Their performance makes them an ideal choice for fields requiring high-performance connectors.

Q: Apart from frequency range, what other factors need to be considered when selecting connectors?

A: In addition to frequency range, factors such as insertion loss, voltage withstand capability, size, and number of mating cycles need to be considered. Different application scenarios may have varying requirements for these factors, so a comprehensive consideration of these factors is necessary when selecting connectors.

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