Number | Name | Date | Kind |
---|---|---|---|
3162717 | Lentz | Dec 1964 | |
3332039 | Oh | Jul 1967 | |
3516024 | Lange | Jun 1970 | |
4636754 | Presser et al. | Jan 1987 |
Entry |
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Lange, "Interdigitated Strip-Line Quadrature Hybrid" MTTS Digest of Technical Papers, pp. 10-13, May 5, 1969, U.S. Pat. No. 3,516,024. |
Kemp et al., "Ultra-Wide Band Quadrature Coupler," Electronics Letters, vol. 19, No. 6, pp. 197-199, Mar. 17, 1983, U.S. Pat. No. 3,516,024. |
Shibata, et al., "Microstrip Spiral Directional Coupler," IEEE Transations on Microwave Theories and Techniques, vol. MTT29, No. 7, pp. 680-689, Jul. 1981. |