ROHO CONNECTOR LIMITED

    As wireless networks evolve toward higher frequencies and greater complexity, the demand for compact, high-performance signal distribution components has never been more critical. Among these, SMA power splitters—also known as power dividers—have emerged as indispensable tools for engineers working in telecommunications, aerospace, defense, and test instrumentation. Leveraging the robust SubMiniature version SMA connector interface, these passive devices split a single RF input signal into multiple outputs with minimal loss, excellent isolation, and precise amplitude and phase matching.     This news report examines the classification and key performance characteristics of SMA power splitters, providing industry professionals with essential insights for component selection in demanding RF environments.     SMA power splitters are categorized primarily by their internal circuit topology, port configuration, power handling capability, and impedance. Each classification directly influences the device's electrical performance and suitability for specific applications.     Wilkinson Power Splitters     The Wilkinson design is the industry standard for applications requiring low insertion loss and high isolation between output ports. These splitters utilize quarter-wave transmission line sections and internal isolation resistors to achieve excellent performance over multi-octave bandwidths. A Wilkinson splitter ensures that each output port remains impedance-matched and that signals from different outputs do not interfere with one another.     Key characteristics of Wilkinson splitters include: Low insertion loss (excess loss typically 0.1–0.5 dB above the theoretical split loss) High isolation (typically 20–30 dB between output ports) Good VSWR (typically 1.2:1 to 1.5:1) Matched phase and amplitude between outputs     These splitters are available in 2-way, 3-way, 4-way, and higher port counts. They are preferred for most telecommunications, radar, and test applications where signal integrity is paramount.     Resistive Power Splitters     Resistive designs employ a network of precision thin-film resistors to divide the signal. While they introduce higher insertion loss (typically 6–8 dB for a 2-way split, compared to the theoretical 3 dB split loss), they offer ultra-wideband performance from DC to frequencies exceeding 18 GHz. The resistive approach also provides excellent return loss at all ports and stable performance across temperature.     Key characteristics of resistive splitters include: Very wide bandwidth (DC to 18 GHz or higher) Higher insertion loss (typically 6–8 dB for 2-way) Moderate isolation (typically 6–10 dB between outputs) Excellent amplitude flatness across frequency     Resistive splitters are ideal for broadband test setups, instrumentation, and applications where extreme f...

    As the wireless communications industry accelerates toward 5G-Advanced, 6G, and beyond, the demand for components capable of operating at millimeter-wave frequencies has never been greater. At the forefront of this technological frontier stands the 2.4mm terminator, a precision coaxial component engineered to deliver exceptional performance from DC to 50 GHz. With its robust mechanical design, superior electrical characteristics, and compatibility with other high-frequency interfaces, the 2.4mm terminator has become indispensable in advanced test and measurement, aerospace and defense, satellite communications, and next-generation wireless research.     Developed in the late 1980s to address the limitations of smaller connectors like the 2.92mm, the 2.4mm interface was designed specifically for high-frequency applications requiring repeatable, low-reflection terminations. Its air-dielectric construction and precision machining allow it to maintain excellent impedance matching well into the millimeter-wave spectrum, making it the connector of choice for engineers pushing the boundaries of frequency and performance.     The 2.4mm connector derives its name from the outer conductor diameter of 2.4 millimeters. Unlike its 2.92mm predecessor—which operates reliably to 40 GHz—the 2.4mm interface was purpose-built for frequencies up to 50 GHz, with some precision variants capable of functioning even higher. The connector features an air-dielectric interface, minimizing loss and ensuring stable characteristic impedance across its operating range.     One of the most significant advantages of the 2.4mm interface is its intermateability with other precision connector families: 2.4mm connectors are fully compatible with 1.85mm connectors (operating to 67 GHz) and 1.0mm connectors (operating to 110 GHz) when using appropriate adapters, though direct mating is not recommended without proper consideration of pin depth tolerances. 2.4mm connectors are not directly compatible with 2.92mm, 3.5mm, or SMA connectors, as the interface dimensions and pin depths differ significantly. Adapters are required for mixed-interface connections.     This compatibility hierarchy makes 2.4mm terminators an essential bridge component in multi-interface test setups, allowing engineers to maintain signal integrity across frequency bands.     2.4mm terminators can be classified according to power handling capability, mechanical configuration, precision grade, and application-specific features.     Power handling in 2.4mm components is inherently limited by the small physical dimensions of the interface. Nevertheless, manufacturers offer a range of power ratings to suit different applications:     Power Class Typical Average Power Applications Low-Power 0.25 W – 0.5 W Signal-level terminations, rece...

    In an industry relentlessly pursuing higher frequencies and smaller form factors, one connector type stands as a testament to durability and simplicity: the UHF connector. Developed in the 1930s by E. Clark Quackenbush, the UHF (Ultra High Frequency) connector—often referred to by its military designation PL-259 (male) and SO-239 (female)—continues to serve a vital role in specific segments of the RF world. Its associated terminators, essential for maintaining signal integrity and protecting equipment, remain indispensable in amateur radio, legacy communication systems, and certain industrial applications.     While its name suggests operation into the UHF spectrum (300 MHz to 3 GHz), the connector's non-constant impedance design limits its practical use to lower frequencies. Nevertheless, its rugged construction, low cost, and ease of field assembly have ensured its survival. Today, we examine the classification and key performance characteristics of UHF terminators, components that absorb energy and prevent reflections in systems where this classic interface still reigns supreme.     The UHF connector's design is straightforward: a threaded coupling mechanism with a rubber gasket for weather resistance, making it suitable for outdoor antenna connections. Its primary limitation is the absence of a controlled impedance interface, which means its characteristic impedance varies with frequency. However, for applications below 300 MHz, this variation is often acceptable, and the connector's ability to handle moderate power levels makes it a practical choice.     UHF terminators can be classified based on power handling capability, which directly influences their construction and application. 1. Low-Power Terminators (1W - 5W)These are compact units designed for bench testing, receiver port termination, and low-power transmitter adjustments. They typically feature a simple resistive element housed in a metal or plastic body. An example is the Mini-UHF terminator from ROHO, which operates from DC to 2.5 GHz and handles 1 watt of power, it shares the same fundamental design principles as standard UHF terminators and is built with a brass body, nickel plating, and PTFE insulation . 2. Medium-Power Terminators (10W - 25W)This is the most common category for UHF applications, particularly in amateur radio and commercial two-way radio systems. These terminators feature more substantial metal housings that act as heat sinks. The Fairview Microwave STT0512, for example, is a 10-watt UHF male (PL-259) termination designed for frequencies up to 512 MHz with a VSWR of 1.3:1 . Similarly, products from manufacturers like ROHO offer 10-watt UHF terminators with extended frequency ranges up to 1 GHz and even lower VSWR specifications of ≤1.2:1 . 3. High-Power Terminators (50W and above)For transmitter testing and high-power amplifier termination, specialized UHF terminators wit...