Which filter type is used to suppress certain frequencies in the Link 16 sub system's antenna system?

Which filter type is used to suppress certain frequencies in the Link 16 sub system's antenna system?

• A. Bandpass filter
• B. Low-pass filter
• C. Upper and lower antenna band suppression filters (notch filters)
• D. High-pass filter

Answer: (C)

Notch filtering is used to suppress specific frequencies in an antenna system. In the Link 16 sub-system, the goal is to minimize interference from signals that lie outside the desired operating band, while preserving the integrity of the Link 16 frequencies. Upper and lower antenna band suppression filters, known as notch filters, are tuned to reject those troublesome frequencies that sit just above and below the target band. By attenuating those particular frequencies, the antenna system reduces out-of-band interference, protects receiver performance, and prevents bleed-through into other channels, all without unduly attenuating the desired Link 16 signals themselves. Other filter types would either pass or reject broad portions of the spectrum. A bandpass filter would let through only a wide passband and wouldn’t specifically suppress adjacent interference. A low-pass filter would remove high-frequency content, potentially cutting into the operating band. A high-pass filter would remove low-frequency content, also risking loss of desired signals. Notch filters target only the problematic frequencies, making them the right choice for this purpose.

Notch filtering is used to suppress specific frequencies in an antenna system. In the Link 16 sub-system, the goal is to minimize interference from signals that lie outside the desired operating band, while preserving the integrity of the Link 16 frequencies. Upper and lower antenna band suppression filters, known as notch filters, are tuned to reject those troublesome frequencies that sit just above and below the target band. By attenuating those particular frequencies, the antenna system reduces out-of-band interference, protects receiver performance, and prevents bleed-through into other channels, all without unduly attenuating the desired Link 16 signals themselves.

Other filter types would either pass or reject broad portions of the spectrum. A bandpass filter would let through only a wide passband and wouldn’t specifically suppress adjacent interference. A low-pass filter would remove high-frequency content, potentially cutting into the operating band. A high-pass filter would remove low-frequency content, also risking loss of desired signals. Notch filters target only the problematic frequencies, making them the right choice for this purpose.