Intermediate frequency filter having a ceramic filter

Details Intermediate frequency filter having a ceramic filter Intermediate frequency filter having a ceramic filter

1992-04-15

1993-09-14

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333186, H03H 900

Patent

active

052453006

ABSTRACT:
An intermediate frequency filter for an intermediate frequency used in the receiver section of a digital radio communications apparatus is composed of an amplitude-flat ceramic filter incorporating two ceramic resonators, a buffer means and a single tuning circuit having the center frequency thereof within the bandwidth of the amplitude-flat ceramic filter, all being connected in series with each other. The center frequency of the single tuning circuit and Q are adjusted to approximate the amplitude characteristic of the intermediate frequency filter to that of TBT filter (0.4.ltoreq.parameter m.ltoreq.1.0).

REFERENCES:
patent: 2929031 (1960-03-01), Kosowsky
patent: 3359512 (1967-12-01), Malinowski
patent: 4048595 (1977-09-01), Vale
patent: 4060776 (1977-11-01), Blinchikoff
Takami et al, "An Approximate Nyquist-transmission for QPSK digital Mobile Communications", IECE Technical Report No. RCS90-6, Jul. 1990.
Shimizu, "Narrow Band Low Distortion Receiver with Delay-Flat Ceramic filter . . . system", IECE Technical Report No. CS84-98, pp. 67-72, Nov. 28, 1984.
Analysis and Synthesis of Transitional Butterworth-Thomson Filters and Bandpass Amplifiers, Mar., 1957, pp. 60-94, RCA Review.
Marconi Instrumentation, vol. 15 No. 1, Narrow Band Crystal Filter Design pp. 10-13, 1975.

Affiliated with

Also associated with

Rating

Intermediate frequency filter having a ceramic filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Intermediate frequency filter having a ceramic filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Intermediate frequency filter having a ceramic filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2030346