4243B-10

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RF Directional Coupler – 4243B-10 Application Field and Working Principle

RF directional couplers are well-known components employed in radio frequency (RF) systems and used in a wide variety of applications. They are specifically designed for measuring the power of an applied RF signal and determining the line matching in such applications. The 4243B-10 is a specific type of RF directional coupler, made with a wide range of features and specifications to meet the highest requirements of the end-users. The following text will present an overview of the 4243B-10’s application field and working principle.

Application Field

The 4243B-10 RF Directional Coupler is designed mainly for RF power measurements and international radio regulations in the frequency range from 400 kHz to 1000 MHz. It is suitable for an input power of up to 20 dBm, making it a perfect choice for those interested in detecting and eliminating sources of interfering signals. The 4243B-10 comes with a standard size of 106x90x30 mm, as well as two N-type female connectors for the primary and secondary ports. The primary port can be matched from 10 to 90 Ω, it has a flat response over the whole frequency range, and the total coupling error can be as low as ± 0.25 dB inside the mentioned frequency range.

In addition, this device can be used for pulse measurements, antenna eigenvalues measurements, signal amplitude fluctuation detection, as well as for analyzing the quality of combinations and amplifiers found in certain systems. Furthermore, customers interested in energy-saving measurements, can set the 4243B-10 to measure the power of an RF signal by adjusting the parameters. All these features make this directional coupler suitable for a broad range of applications from consumer electronics and medical systems to defense and aerospace research.

Working Principle

The 4243B-10’s working principle is based on a small section of the line in its primary port which is connected to the secondary port through an isolator. This segment of the line acts as an impedance transformer at high frequencies and a short-circuited stub at low frequencies. The RF signals from the primary port are coupled by the transformer onto the secondary port, thus generating a directionally 90° out of phase opposite signal at the second port. The magnitude of the coupled power can be precisely calculated by the RF directional coupler and is inversely proportional to the square of the distance between the primary and secondary ports.

The degree of isolation is also affected by the ratio between the impedances of the primary and secondary ports. The more the primary port is coupled to the secondary port, the lower the isolation. A high isolation of more than 50 dB can be achieved with the 4243B-10, and the amount of power can be measured accurately even if the connected load resistance is changed. This is because the impedance transformer acts as a constant impedance element thanks to the parasitic capacitors found in the RF line coupler.

The 4243B-10 RF directional coupler is not only able to detect RF signals from a wide range of sources, but also come with a built-in voltage regulator, which allows it to measure power from any incoming RF signals without any additional circuitry.

In conclusion, the 4243B-10 is an advanced RF directional coupler with a wide range of features and specifications, making it suitable for a large variety of applications. With its primary port impedance matching, flat response over the whole frequency range, high isolation and accurate power measurements, the 4243B-10 provides the best results for anyone looking for a reliable, high-performance RF directional coupler.

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