Reconfigurable phaser using gain-loss C-sections for radio analog signal processing (R-ASP)

Abstract

Some emerging applications of R-ASP require the radio systems to adapt to dynamic environments. This cannot be achieved using phasers with fixed group delay profiles. Therefore, we introduce here a gain-loss loaded C-section phaser featuring real-time tunability, or reconfigurability, in group delay. This phaser exhibits an all-pass response all the way across its tuning range thanks to a paired and equalized gain-loss C-section unit. A numerical example is provided, where reconfigurability is achieved by tuning the gain-loss pair of the different gain-loss C-section units of the phaser.

Real-Time Electromagnetic Signal Processing: Principles and Illustrations

“…Figure 5 shows three different group delay profiles along with the corresponding three different sets of controlling gain. Enhancement of the group delay swing and the reversed slope of the group delay curve is achieved [35,36].…”

“…This leads to a reconfigurable all-pass phaser, where all-pass amplitude is obtained by cascading a pair of gain and loss loaded C-sections [35,36].…”

“…The same operation can also Figure 5. N-unit all-pass reconfigurable phaser based on the paired gain-loss C-section unit shown in Figure 4(c) [35]. ©IEEE; reprinted with permission.…”

Substrate integrated waveguide dispersive delay structure based on wave trapping

“…Loss is a significant issue in designing the DDSs, especially at group delay peaks [14]. This problem could be solved by inserting an amplifier into a single DDS [14, 15], or between DDSs in the cascading configuration. The second problem is the size of the cascaded structure, which could be solved by inserting DDS into a feedback loop configuration [16, 17].…”

Loss-Gain Equalized Reconfigurable Phaser for Dynamic Radio Analog Signal Processing (R-ASP)

“…We have shown that introducing balanced loss and gain in a conventional C-section phaser [24]- [26] equally enhances the overall group delay of the phaser while reversing its magnitude response [27]. Furthermore, using equalized loss-gain pair of C-sections results in a perfect phaser, exhibiting flat (allpass) magnitude and controllable group delay, a response that is impossible in purely passive phasers, where higher group delays are always accompanied with higher loss due to longer time wave trapping, and hence increased dissipation, within the structure.…”