CPL-5215-30-SMA-79

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An RF directional coupler is a device designed to measure power levels in a two-way radio system. It does this by isolating the reverse power levels from the forward power, usually in the form of a directional coupler. The CPL-5215-30-SMA-79 is an example of such a directional coupler, and this article will explore its application field and working principle.

Application Field

The CPL-5215-30-SMA-79 is a high-directivity, constant-impedance, single-port wideband directional coupler with a frequency range from DC to 40 GHz. It is designed to isolate reverse signals from forward signals in a wide variety of two-way radio systems, including VHF/UHF land mobile radios, commercial satellite links, and radio broadcasting systems. The coupler’s robust construction makes it suitable for use in a variety of harsh environmental conditions such as high temperatures, high humidity, and vibration environments.

The CPL-5215-30-SMA-79 is designed for application in RF power measurements in commercial two-way radio systems. Its wide bandwidth and low insertion and return loss make it suitable for use in a variety of settings. In addition, its 50 Ω impedance and high directivity make it compatible with a variety of popular signal timing protocols. Its small size and lightweight design make it easy to integrate into existing radio systems.

Working Principle

The CPL-5215-30-SMA-79 is a high-directivity, constant-impedance, single-port wideband directional coupler. It consists of two resistor-capacitor (RC) networks in series. One of the networks is connected directly between the port 1 and port 2, while the second is connected between the port 2 and ground. The coupling factor is derived by comparing the impedance of port 1 to the impedance of port 2.

The resistor-capacitor network is designed to respond to signals with frequencies between 8 MHz and 40 GHz and to reject signals outside this frequency range. The resistors in the RC network act as a low-pass filter, reducing the power of the signals at higher frequencies. The capacitors in the RC network act as a high-pass filter, reducing the power of the signals at lower frequencies. This effectively isolates the forward and reverse power, allowing the coupler to accurately measure reverse power levels without interference from forward signals.

To further improve accuracy, the CPL-5215-30-SMA-79 is designed to maintain a 50 Ω impedance over the entire frequency range. This enables it to accurately measure the impedance of the two-way radio system, which helps to ensure proper impedance matching and isolation of the two signals.

In summary, the CPL-5215-30-SMA-79 is a wideband directional coupler designed specifically for use in RF power measurements in commercial two-way radio systems. Its wide bandwidth and low insertion and return loss make it suitable for a variety of applications, while its 50 Ω impedance and high directivity enable it to accurately measure reverse power levels without interference from forward signals.

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