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Title: | Reflectionless Adaptive RF Filters: Bandpass, Bandstop, and Cascade Designs |
Authors: | Dimitra Psychogiou;Roberto G&x00F3;mez-Garc&x00ED;a |
Year: | 2017 |
Publisher: | IEEE |
Abstract: | A class of frequency-reconfigurable input-reflectionless/absorptive RF/microwave filters is presented. They consist of tunable complementary-duplexer architectures that are composed of a main and an auxiliary channel with opposite filtering transfer functions. By loading the auxiliary channel with a reference-impedance resistor and by taking the output node of the main channel as the output terminal of the overall circuit, a filtering network of the same type of the main channel with theoretically perfect input-reflectionless behavior at all frequencies can be realized. This technique can be applied to design spectrally agile completely input-reflectionless filters with any kind of transfer function, such as low-pass, high-pass, and single/multiband bandpass/bandstop filters. The theoretical analysis of the first-order absorptive bandpass/bandstop filtering sections based on a coupling-matrix formulation is detailed. Furthermore, the synthesis of high-selectivity reflectionless filters either by cascading multiple first-order cells or using high-order channels in a single complementary duplexer is also described. For practical-demonstration purposes, frequency-tunable lumped-element and microstrip prototypes are manufactured and characterized. They correspond to first- and second-order bandpass/bandstop filters. In addition, their in-series cascade connection is used to implement a bandpass filter with spectrally controllable passband and out-of-band notches. |
URI: | http://localhost/handle/Hannan/211011 |
volume: | 65 |
issue: | 11 |
More Information: | 4593, 4605 |
Appears in Collections: | 2017 |
Files in This Item:
File | Size | Format | |
---|---|---|---|
8008787.pdf | 6.48 MB | Adobe PDF |
Title: | Reflectionless Adaptive RF Filters: Bandpass, Bandstop, and Cascade Designs |
Authors: | Dimitra Psychogiou;Roberto G&x00F3;mez-Garc&x00ED;a |
Year: | 2017 |
Publisher: | IEEE |
Abstract: | A class of frequency-reconfigurable input-reflectionless/absorptive RF/microwave filters is presented. They consist of tunable complementary-duplexer architectures that are composed of a main and an auxiliary channel with opposite filtering transfer functions. By loading the auxiliary channel with a reference-impedance resistor and by taking the output node of the main channel as the output terminal of the overall circuit, a filtering network of the same type of the main channel with theoretically perfect input-reflectionless behavior at all frequencies can be realized. This technique can be applied to design spectrally agile completely input-reflectionless filters with any kind of transfer function, such as low-pass, high-pass, and single/multiband bandpass/bandstop filters. The theoretical analysis of the first-order absorptive bandpass/bandstop filtering sections based on a coupling-matrix formulation is detailed. Furthermore, the synthesis of high-selectivity reflectionless filters either by cascading multiple first-order cells or using high-order channels in a single complementary duplexer is also described. For practical-demonstration purposes, frequency-tunable lumped-element and microstrip prototypes are manufactured and characterized. They correspond to first- and second-order bandpass/bandstop filters. In addition, their in-series cascade connection is used to implement a bandpass filter with spectrally controllable passband and out-of-band notches. |
URI: | http://localhost/handle/Hannan/211011 |
volume: | 65 |
issue: | 11 |
More Information: | 4593, 4605 |
Appears in Collections: | 2017 |
Files in This Item:
File | Size | Format | |
---|---|---|---|
8008787.pdf | 6.48 MB | Adobe PDF |
Title: | Reflectionless Adaptive RF Filters: Bandpass, Bandstop, and Cascade Designs |
Authors: | Dimitra Psychogiou;Roberto G&x00F3;mez-Garc&x00ED;a |
Year: | 2017 |
Publisher: | IEEE |
Abstract: | A class of frequency-reconfigurable input-reflectionless/absorptive RF/microwave filters is presented. They consist of tunable complementary-duplexer architectures that are composed of a main and an auxiliary channel with opposite filtering transfer functions. By loading the auxiliary channel with a reference-impedance resistor and by taking the output node of the main channel as the output terminal of the overall circuit, a filtering network of the same type of the main channel with theoretically perfect input-reflectionless behavior at all frequencies can be realized. This technique can be applied to design spectrally agile completely input-reflectionless filters with any kind of transfer function, such as low-pass, high-pass, and single/multiband bandpass/bandstop filters. The theoretical analysis of the first-order absorptive bandpass/bandstop filtering sections based on a coupling-matrix formulation is detailed. Furthermore, the synthesis of high-selectivity reflectionless filters either by cascading multiple first-order cells or using high-order channels in a single complementary duplexer is also described. For practical-demonstration purposes, frequency-tunable lumped-element and microstrip prototypes are manufactured and characterized. They correspond to first- and second-order bandpass/bandstop filters. In addition, their in-series cascade connection is used to implement a bandpass filter with spectrally controllable passband and out-of-band notches. |
URI: | http://localhost/handle/Hannan/211011 |
volume: | 65 |
issue: | 11 |
More Information: | 4593, 4605 |
Appears in Collections: | 2017 |
Files in This Item:
File | Size | Format | |
---|---|---|---|
8008787.pdf | 6.48 MB | Adobe PDF |