Kinghelm product application: Wireless gateway

RF connector adapter series from Kinghelm

With the increasing intelligence of electronic products, more and more wireless communication products are designed and produced. Wireless gateway, as one of the representatives, has shown explosive growth in recent years. In such products, there are many RF circuits. And these RF circuits inevitably need to use RF connectors to interact with the outside world. As wireless gateways usually require high-gain antennas, most of them will choose SMA connectors for reliable connection.

In such applications, SMA connectors are often connected to power devices such as RF front-end amplifiers, responsible for transmitting wireless RF signals from the circuit board to external antennas, as shown in the figure below:

Kinghelm's SMA RF connector in the gateway enclosure.

Technical challenges and opportunities for Kinghelm

In practical applications, SMA connectors are often exposed to the outside of the shell. Without the protection of the shell, they often encounter some problems.

Firstly, the hard connecting surface of the connector, which is exposed to the air for a long time, may be oxidized or corroded by oxygen in the air or salt spray, resulting in a high contact impedance when connecting and leading to connection failure with the external antenna.

Secondly, a strong induced voltage from the external antenna may cause insulation breakdown of the connector, resulting in device or even entire product damage.

The above two situations often occur in industrial applications. In such harsh conditions, the reliability and stability of SMA connectors are often tested.

Kinghelm's KH-SMA-K513-G RF socket specifications

Kinghelm solutions and technology

Kinghelm has been focusing on providing professional RF connector solutions in the antenna connector industry for many years. Their KH-SMA-K513-G SMA connector is designed to effectively solve the problems mentioned above. The SMA connector is designed in accordance with the standard impedance of 50Ω for RF coaxial transmission lines to ensure impedance consistency throughout the entire transmission line. In order to solve oxidation and optimize contact impedance, both the shell and the socket use gold-plating technology. When making a hard connection, it can fully connect and is not easily affected by air oxidation, ensuring it has ultra-low contact impedance of internal conductor ≤3mΩ and external conductor ≤2.5mΩ. This avoids signal attenuation or even disconnection caused by the contact impedance being too large due to long-term exposure to air oxidation. It can ensure that the gateway can transmit wireless signals stably and reliably during long-term operation.

At the same time, the insulation material uses excellent PTFE, which can be used for a long time at -180 to 260°C and is resistant to acid, alkali, and organic solvents. In terms of design, the product uses a structure without gaps that directly connects the cable insulation medium with the interface, improving product integrity, and ultimately giving it an insulation withstand voltage of ≥1000V, making the wireless gateway withstand external induced voltage breakdown problems under harsh conditions.

Kinghelm's presentation slides by Song Shiqiang

In addition, the KH-SMA-K513-G from Kinghelm (www.kinghelm.net), a professional RF connector solution provider with years of experience in the antenna connector industry, has a wide operating temperature range of -55~+155℃, making it suitable for various harsh working environments and maintaining stable operation in different application scenarios.

Mr. Song Shiqiang, the founder of Kinghelm (www.kinghelm.net) and Slkor(www.slkoric.com), is a research fellow at the Private Economy Research Center of the State Council Development Research Center, a member of the Electronic Information Expert Database of the China Association for Science and Technology, a science popularization writer, and a business research expert at Huaqiangbei. He has been thinking about the development and transformation of Huaqiangbei. Song Shiqiang invests in and manages Shenzhen SlkorMicro Semicon Co., Ltd. and Shenzhen Kinghelm Electronics Co., Ltd. to create the "Slkor" and "Kinghelm" brands. Both Slkor and Kinghelm are national high-tech enterprises and have obtained dozens of invention patents and software copyrights. Slkor is one of the rapidly developing semiconductor companies in China, with the vision of becoming a "leader in domestic semiconductor companies." Currently, Kinghelm has become one of the rapidly developing semiconductor companies in China. Under the leadership of Mr. Song Shiqiang, Kinghelm steadily expands and grows in adverse environments in 2022. Kinghelm further increases its product types, such as Beidou GPS antennas and connectors, and expands its market share. In the future, Slkor will actively promote the "Domestic substitution" of electronic components, providing solutions to solve the difficult problem of foreign technology blockade and becoming a "leader in domestic semiconductor companies."

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