Miniature Microwave Frequency Multiplexers
Abstract
A novel frequency multiplexer has been developed which divides the 6- 18 GHz band into 8 equal size sub-bands. The multiplexer consists of seven diplexers, each of which was realized as an individual MMIC. Two prototype multiplexers were assembled and evaluated. The diplexers take advantage of a novel filter design approach. In this approach, conventional lumped element filters define the basic filter shape. In addition, transversal filter elements are integrated, and serve to sharpen the band edge rejection characteristics. These transversal elements are realized with active mode MESFETs. A low order, MMIC filter using lumped and transversal elements has been demonstrated. This filter, described in Appendix A, has low pass band loss and high signal rejection near its pass band edges. The use of transversal elements reduced pass band loss and increased the filter rejection out of band. In addition, the filter was of moderate complexity and fabricated as an MMIC. These qualities merited further study of lumped/transversal filters for use as diplexer building blocks. This diplexer would be used in the output stage in a high pass/high pass, low pass/low pass multiplexer configuration.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 31, 1991
- Accession Number
- ADA246032
Entities
People
- B. Erfany
- K. Simon
- M. Schindler
Organizations
- RTX