Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1989-01-03
1991-06-04
Lee, Benny
Wave transmission lines and networks
Plural channel systems
Having branched circuits
333166, 330286, 330 54, H03H 746, H03H 1500
Patent
active
050217569
ABSTRACT:
Transversal and recursive filters having an input propagation lumped element network with a band pass filter response, a low pass filter response, or a high pass filter response, and an output propagation network having a low pass frequency response, a high pass frequency response, or a band pass frequency response are described. Weighting means including a plurality of field effect transistors are used to successively couple the input propagation network and the output propagation network. The general shape or response of the transversal filter is provided by choosing the characteristics of the input and output propagation networks in relation to the desired filter response. With the general shape provided by the propagation networks rather than only by the transversal elements, fewer transversal elements are required to provide a desired response. Thus, the transversal filters are smaller which increases the manufacturability of the circuit and reduces the cost of the circuit particularly when fabricated as a monolithic microwave integrated circuit. Further, for transversal filters having a bandpass characteristic, harmonic sub-bands generated at high frequencies are eliminated by use of lumped element networks having cutoff frequencies coinciding with the frequency skirts or bandedges of the filter.
REFERENCES:
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patent: 4311966 (1982-01-01), Bert et al.
patent: 4661789 (1987-04-01), Rauscher
patent: 4751744 (1988-06-01), Pavio, Jr.
patent: 4772858 (1988-09-01), Tsukii et al.
Schindler Manfred J.
Tajima Yusuke
Lee Benny
Maloney Denis G.
Raytheon Company
Sharkansky Richard M.
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