authors
- GARCIA PEREZ, OSCAR ALBERTO
- GARCIA LAMPEREZ, ALEJANDRO
- GONZALEZ POSADAS, VICENTE
- SALAZAR PALMA, MAGDALENA
- SEGOVIA VARGAS, DANIEL
Dual-Band Recursive Active Filters with Composite Right/Left-Handed Transmission Lines
Articles
Overview
published in
publication date
- May 2009
start page
- 1180
end page
- 1187
issue
- 5
volume
- 57
Digital Object Identifier (DOI)
International Standard Serial Number (ISSN)
- 0018-9480
Electronic International Standard Serial Number (EISSN)
- 1557-9670
abstract
- Unique properties exhibited by metamaterial transmission lines have been previously used to design a large number of dual-band microwave passive devices, but not active ones. In this paper, a novel dual-band active filter scheme based on composite right/left-handed transmission lines is proposed. The inclusion of these types of lines as feedback sections in a first-order recursive topology can be used to generate a filtering response with two arbitrary passbands. Additionally, dual-band couplers are also required. These may be implemented by means of stub-loaded branch-line structures. As an added advantage, these elementsproduce a strong rejection level at the central stopband that improves the overall response. Theoretical analysis and design procedures are verified by means of manufacturing and measurement of a prototype containing a distributed amplifier.