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Microwave Transversal Filter

IP.com Disclosure Number: IPCOM000086684D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Lautier, A: AUTHOR [+2]

Abstract

This is a transversal filter suitable for microwave frequencies. Fig. 1 shows a three-tap transversal filter widely used in datadata-transmission systems. It comprises a three-tap delay line, with a delay of T sec. between two consecutive taps, and three multipliers for multiplying each tap signal by coefficients a, b and c, respectively. The outputs from the multipliers are summed in summing device sigma which provides the filtered output signal. The use of this filter structure for microwave frequencies would involve the provision of two power dividers at the two first taps. Since power dividers do not have identical power loss characteristics, the structure of Fig. 1, when used for microwave frequencies, would need a critical coefficient setting.

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Microwave Transversal Filter

This is a transversal filter suitable for microwave frequencies. Fig. 1 shows a three-tap transversal filter widely used in datadata-transmission systems. It comprises a three-tap delay line, with a delay of T sec. between two consecutive taps, and three multipliers for multiplying each tap signal by coefficients a, b and c, respectively. The outputs from the multipliers are summed in summing device sigma which provides the filtered output signal. The use of this filter structure for microwave frequencies would involve the provision of two power dividers at the two first taps. Since power dividers do not have identical power loss characteristics, the structure of Fig. 1, when used for microwave frequencies, would need a critical coefficient setting.

The filter of Fig. 2 is more suitable for microwave frequencies. The input signal is split into three tap signals by a single three-way power divider. The first tap signal is fed directly to attenuator alpha, while the two other tap signals are fed to attenuators beta and gamma through two delay elements which introduce delays T and 2T, respectively. Delays T and 2T are provided by coaxial lines having proper length. The outputs from the attenuators are applied to a three- way power coupler which provides the filtered output signal. A single three-way power divider provides three well-balanced tap signals, and thus permits an easy coefficient setting.

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