Transmission_zeroes
Generally, in a two-port network, for a finite input, there exists an output. However, when zero output occurs for finite input, the network is said to have 'zero-transmission'. A transmission zero is a frequency at which the transfer function of a linear two-port network has zero transmission.[1]: 165 Transmission zeroes at zero frequency and infinite frequency may be found in high-pass filters and low-pass filters respectively. Transmission zeroes at finite, non-zero frequency may be found in band-stop filters, elliptic filters, and type II Chebyshev filters. Transfer functions with both zero and infinite frequency can be found in band-pass filters. A transfer function may have multiple zeroes at the same frequency. A transfer function may have any number of transmission zeroes at zero frequency and infinite frequency, but transmission zeroes at finite non-zero frequency always come in conjugate pairs.
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Combination of elements may prevent input from reaching the output by 'shortening' or 'opening' all transmission path by means of serial or parallel reasonance. For a more general overview, see: of zeros and poles.