LDD211G7503A-067

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RF Filters are a type of electromagnetics transmission components that are used to isolate signals from one another. This is a critical engineering task, as thousands of signals are constantly being broadcasted into the air, and the component’s purpose is to allow only certain signals to pass through. The LDD211G7503A-067 is an example of such a RF filter. This component is a three-band duplexer, used for base station antenna applications. It provides superior throughput, selectivity, and isolation for efficient system performance in the frequency range of 717 – 797 MHz, 825 – 890 MHz, and 1850 – 1990 MHz.

Application Field

This component is primarily used as a duplexer in base station antenna applications. It is designed to efficiently separate and combine two signals. In a classic two-antenna base station application, an example of how it is used is a transmitting antenna to send out a signal, while the second antenna receives another signal, separated by the duplexer. This component, in this example, would be used to keep the transmitting and receiving signals from interfering with each other since they are on the same frequency. To prevent interference, it is designed to separate those two signals.

Apart from use in base station antennas, this component can be found in other applications, such as in RF transmitters and receivers. The component also be used in military radios, LAN Card, and satellite communication systems.

Working Principle

The component comprises a ceramic duplexer core, Tchebychev filters, and cavities. It is composed of both high and low pass filters, as well as two junction connections. The cavities trap or reject energy at their target center frequencies depending on the type of filter. The high and low pass filters are used to block out signals that are at higher and lower frequencies that respectively. The junction connections are used to couple the signals in and out of the component.

The working principle of the LDD211G7503A-067 is straightforward. It is designed to pass desired frequencies and reject unwanted frequencies or noise. It starts off with a ceramic duplexer core which traps the desired frequencies. Then, Tchebychev filters come into play. The Tchebychev filters act as a low pass filter, allowing frequencies below the cutoff frequency to be passed, while blocking frequencies above the cutoff frequency. On the other hand, it also acts as a high pass filter, allowing frequencies above the cutoff frequency to pass while blocking frequencies below the cutoff frequency. Finally, the cavities reject or trap frequencies at their target specific frequencies depending on the type of filter.

In short, the LDD211G7503A-067 is a duplexer used for base station antenna applications. It comprises of a ceramic duplexer core, Tchebychev filters, and cavities, and it provides superior throughput, selectivity, and isolation in a wide frequency range of 717 – 797 MHz, 825 – 890 MHz, and 1850 – 1990 MHz. The component works by passing desired frequencies and rejecting unwanted frequencies or noise.

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