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A frequency band in which the attenuation of a filter is essentially zero.



the frequency range within which the amplitude-frequency characteristic of an acoustic, radio-engineering, or optical device is sufficiently uniform to assure the transmission of a signal without substantial distortion of the signal’s shape.

The basic parameters of a passband are the width of the band and the nonuniformity of the amplitude-frequency characteristic within the band. The bandwidth is usually defined as the difference between the upper and the lower limiting frequencies of the section of the amplitude-frequency curve where the minimum amplitude of the oscillations is not less than 0.707, or Passband, of the maximum amplitude. The nonuniformity of the amplitude-frequency curve quantitatively characterizes the degree to which the curve deviates from a straight line parallel to the frequency axis. The bandwidth is expressed in frequency units, such as hertz (Hz), and nonuniformity is expressed in relative units or in decibels.

The passband required for a particular device depends on the device’s purpose. For example, telephone systems require band-widths of 300 to 3400 Hz, high-quality reproduction of musical performances requires 30 to 16,000 Hz, and television broadcasting uses bandwidths of up to 8 MHz. The widening of a passband permits the transmission of a greater amount of information; by reducing the nonuniformity of the amplitude-frequency characteristic within the passband, the reproduction of the shape of the transmitted signal can be improved. Passbands are sometimes defined also in terms of the device’s phase-frequency characteristic.


Gonorovskii, I. S. Radiotekhnicheskie tsepi i signaly. 2nd ed. Moscow, 1971.

A. S. Grinchik

References in periodicals archive ?
Residual analysis was performed with measured data sets to identify low pass filter pass band frequency.
have found the pass band frequency to be as shown in FIGURE 3 where r is the relative permittivity of the dielectric material, and c is the speed of light, a function of via diameter, via spacing and dielectric material (3).
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a world leader in media, storage, and battery technologies, has announced in concert with its Optical Component Business Unit the introduction of new Maxell 50GHz and 100GHz DWDM filters and CWDM filters with a revolutionary layered structure featuring a wide pass band with low ripple and excellent temperature stability.
Radio designers require high performance filters with low pass band distortion to ensure high levels of signal integrity for the best possible transmission quality.
With a low channel pass band of 698-894 MHz and a high channel pass band of 1710-2170 MHz, the low channel product is designed to accommodate LTE700, European Digital Dividend and 850 MHz systems while the high channel offering accommodates AWS/DCS/PCS/UMTS systems.
The Ultra-Low Loss ROADM incorporates NeoPhotonics' advanced planar lightwave circuit (PLC) technology to significantly reduce the insertion loss and increase the pass band, thus meeting the requirements for next generation 40 Gbps optical transmission systems.
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The newly released GEM CWDM joins other successful Oplink R&D initiatives including the company's 50GHz thin film filter technology, BWDM solutions and its 100GHz wide pass band products.