In cutting-edge fields such as 5G communications, IoT devices, aerospace, and automotive electronics, stable transmission of high-frequency signals has become a core guarantee of system performance. As a critical component of RF connectors, the SMA cable end—thanks to its compact threaded structure, excellent electrical performance, and superior environmental adaptability—has been widely adopted to create high-frequency pathways between antennas, RF modules, and transmission cables. This article focuses on the technical advantages of the Kinghelm KH-FSSMAK-L-RG113 SMA cable end and explores its practical value in complex application scenarios, offering engineers, procurement professionals, and industry practitioners an efficient product selection reference.

Kinghelm KH-FSSMAK-L-RG113 Product Image

Since its introduction in the 1960s, the SMA (Sub-Miniature-A) connector has been a core component in RF and microwave communications due to its standardized interface, low insertion loss, and high reliability. Particularly effective in the 0–6 GHz frequency range, the 50Ω impedance-matching design significantly reduces signal reflection and energy loss, ensuring signal integrity. Its threaded locking mechanism enhances mechanical stability and enables reliable performance even in extreme environments ranging from -40°C to +80°C, making it an ideal choice for 5G base stations, satellite communications, and in-vehicle devices. 

As a technology-driven brand in China’s RF connector industry, Kinghelm continuously innovates and upgrades its products. The KH-FSSMAK-L-RG113 model features multidimensional improvements in cable-end design. For instance, it meets IP67 waterproof standards and remains operational after short-term submersion in 1 meter of water, adapting well to harsh outdoor environments. It also passes a 48-hour salt spray test with no signs of corrosion on the metal surface, making it especially suitable for marine and chemical industry applications. The product features an 11-thread precision gold-plated female interface with a plating thickness of 1.27 μm, reducing contact resistance to as low as 5 mΩ. At 6 GHz, insertion loss is less than 0.2 dB, significantly enhancing signal transmission efficiency.

To achieve high-quality long-distance transmission, the KH-FSSMAK-L-RG113 is specially designed to fit RG113 low-loss coaxial cables. Its customized interface ensures impedance continuity, and when combined with RG113's excellent attenuation performance (0.66 dB/m @ 2.4 GHz), it maintains stable RF performance even across communication paths exceeding 10 meters. This makes it ideal for applications such as vehicle-mounted terminals and IoT gateways that require high bandwidth and long-distance connectivity. Furthermore, the product uses phosphor bronze contacts and a copper alloy shell, supporting more than 500 insertion/extraction cycles with no significant degradation in electrical performance—making it well-suited for demanding applications like industrial automation and medical equipment.

In terms of technical specifications, the KH-FSSMAK-L-RG113 supports a 50Ω impedance, 0–6 GHz frequency range, and is applicable to high-frequency systems such as 5G NR, mmWave radar, and satellite communications. Its design balances temperature stability and mechanical durability, operating reliably within a -40°C to +80°C range and passing multiple thermal shock tests. The threaded locking structure provides a stable torque of 0.6 N·m to prevent loosening due to vibration or impact. The connector is available in both right-angle and straight versions, optimizing PCB layout space. Weighing only 4.792 grams, it meets the lightweight requirements of drones and portable communication devices.

In real-world applications, the KH-FSSMAK-L-RG113 is widely used in 5G communication infrastructure—such as low-loss connections between RRU and antennas, small cell deployments, and distributed antenna system (DAS) networks. In vehicle networking and autonomous driving, the product reliably connects T-Box and V2X modules while supporting high-precision BeiDou/GPS positioning. It also performs exceptionally well in the industrial IoT, enabling data return for wireless sensors and reliable operation in explosion-proof environments. In the aerospace and satellite communication sectors, its lightweight, high-temperature resistance, and vibration resistance make it ideal for satellite payloads and ground station equipment. In medical imaging systems, the KH-FSSMAK-L-RG113 serves as a key RF connector between RF coils and signal processing units in MRI and CT devices.

Kinghelm KH-FSSMAK-L-RG113 Specification

In summary, the Kinghelm KH-FSSMAK-L-RG113 is more than just a high-frequency SMA cable end connector—it is a professional RF solution that integrates protection, precision, and top-tier electrical performance. Its compatibility, durability, and transmission quality have been validated across numerous high-standard industries, making it a reliable choice for engineering projects requiring high-performance communication links. Choosing Kinghelm means choosing a stable and efficient RF pathway.

About Kinghelm

Shenzhen Kinghelm Electronics Co., Ltd.（www.kinghelm.net）has technical backbones from Tsinghua University and UESTC, and has introduced overseas returnee professionals. Kinghelm is able to develop highly reliable and high-performance antenna and connector products.KH series products of "Kinghelm" brand include Beidou/GPS antennas, RF adapter connectors, plug connector, electrical data connectors, terminals, and customized vehicle harnesses, industrial / medical connectors, and special antenna connectors."Kinghelm connects world", Kinghelm has grown with the development of China's Beidou industry. Starting from supplying Beidou/GPS dual mode antennas, IPEX terminals, and RF adapter cables for automotive manufacturers, Kinghelm has continuously developed products. Currently, it has a series of WiFi, Bluetooth, NB-loT, LoRa, Zigbee, UWB, and GSM antennas, RFID tags, RF adapter cables, standard microwave antennas, vehicle grade SMA, SMB, FAKRA holders, coaxial cables, and can customize non-standard antenna connectors based on customer drawings or samples.