Group delay is used to measure the response in the ultra-wideband region. Can it be a good parameter to analyse the performance of a narrowband antenna? If yes, how? Please share your views on the statement.
Dear Mam,
The group delay quantifies the phase distortion of the wide band antenna which in return measures the time delay that each frequency component takes to reach the destination. However, the researchers assume that the narrow band antenna has no phase distortion due to its small frequency coverage. In fact, this is just an assumption, so one can take into account the group delay in the narrow band antenna to be more specific in demonstrating the phase distortion problem. The following are some references about the group delay:
https://ieeexplore.ieee.org/document/7073593?arnumber=7073593
https://www.jpier.org/pierc/pier.php?paper=14090404
Group delay is not a good parameter to analyze the performance of a narrowband antenna. Since the UWB has a short pulse so it needs to be calculated the time delay that each frequency component takes to reach the destination. But in the case of Narrowband is not necessary.
Dear Sapna Chaudhary ,
The group delay is measured by the rate of change of the phase with the frequency. If the phase changes linearly with the frequency then the group delay time will be constant and frequency components will be coherent.
In the sense they will conserve their profile in time domain as said by Prabhu Palanisamy . Therefore phase nonlinearity will be important in case of wideband signals. So, if you want to check the phase linearity of you antenna you have to consider the phase variation of the transmitted signal from the antenna with frequency. Even wide band antennas are designed such that their phase variation inside the transmission region is negligible such that they do not disperse the narrow pulses.
Hope this publication may help you
Article Characterization of group delay in linearly and circularly p...
To expand the common situation awareness I'd like to inform you that the group delay can be measure via superresolution of radio pulse signals method. The general idea of this was published in the conference abstract:Conference Paper Using of high-resolution in time delay for the analysis of d...
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