Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1978-08-17
1981-02-24
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333204, 333246, H01P 708, H01P 1205, H01P 1203
Patent
active
042530733
ABSTRACT:
A method of fabrication and apparatus are disclosed for realizing a high-frequency non-transverse electromagnetic (non-TEM) mode interdigital band-pass filter. The filter has interdigital microstrip resonators R.sub.i separated a constant distance H from a ground plane by a propagation medium. The method of fabrication allows the W.sub.i /H.sub.i and S.sub.i,i+1 /H.sub.i dimensions of the filter to be obtained. The method starts by determining the self and mutual admittance values Y.sub.i,i and Y.sub.i,i+1, respectively, of each resonator R.sub.i. An estimate for W.sub.i /H.sub.i for each resonator can be made, if desired, using a single microstrip approach. The W.sub.i /H.sub.i estimates are used to obtain the S.sub.i,i+1 /H.sub.i value for each adjacent pair of resonators R.sub.i,R.sub.i+1. The S.sub.i,i+1 /H.sub.i values are used to obtain the values for Y.sub.f and/or Y.sub.fe for each resonator R.sub.i. The values for Y.sub.f and/or Y.sub.fe are used to calculate the value for Y.sub.pp for each resonator R.sub.i. Each Y.sub.pp value is used to obtain a value for W.sub.i /H.sub.i. The method of fabrication is convergent and can be iterated to obtain convergent values for S.sub.i,i+1 /H.sub.i and W.sub.i /H.sub.i so that a filter can be produced having the desired electrical passband response.
REFERENCES:
patent: 3327255 (1967-06-01), Bolljhan et al.
patent: 3348173 (1967-10-01), Matthaei et al.
patent: 3588757 (1971-06-01), Andrascek
patent: 4020428 (1977-04-01), Friend et al.
Grieg et al-"Microstrip-A New Transmission Technique for the Kilomegacycle Range", Proc. I.R.E., vol. 40, Dec. 1952; pp. 1644-1650.
Matthaei-"Microwave Filters, Impedance-Matching Networks, and Coupling Structures", McGraw-Hill, New York, 1964; pp. 614-634.
Cristal-"New Design Equations for a Class of Microwave Filters", IEEE Trans. on Microwave Theory and Techniques, vol. MTT-19, No. 5, May 1971; pp. 486-490.
Bryant et al.-"Parameters of Microstrip Transmission Lines and Coupled Pairs of Microstrip Lines", IEEE Trans. on Microwave Theory and Techniques, vol. MTT-16, Dec. 1968; pp. 1007-10012.
Cristal-"Tapped-Line Coupled Transmission Lines with Applications to Interdigital and Combline Filters", IEEE Trans. on Microwave Theory and Techniques, vol. MTT-23, No. 12, Dec. 1975; pp. 1007-10012.
Milligan, "Dimensions of Microstrip Coupled Lines & Interdigital Structures", in IEEE Trans. on MTT, May 1977, pp. 405-410.
Communications Satellite Corporation
Nussbaum Marvin L.
LandOfFree
Single ground plane interdigital band-pass filter apparatus and does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Single ground plane interdigital band-pass filter apparatus and , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Single ground plane interdigital band-pass filter apparatus and will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1411909