Very compact UWB antenna with group delay improvement

Abstract

In this paper, very compact (12mm?17mm) and simple UWB antenna is proposed. The achieved bandwidth of the presented antenna is from 3.05 GHz to 12.5 GHz and in the most of the bandwidth, the return loss is less than -20dB. In addition to frequency characteristics, time characteristics such as group delay variations for three different antenna positions, namely, front to front, back to back and side by side using CST MW studio are simulated and discussed. To improve the group delay variations, by changing the radius of the circle on the back side of the antenna, the antenna gain in different frequencies will be tuned, therefore, the time domain characteristics of the proposed antenna are greatly improved.

Design and fabrication of a super-wideband transparent antenna implanted on a solar cell substrate

“…For the two similar antennas, and are equal, if the phase shift is proper to the frequency the group delay is constant and therefore there is no dispersion, otherwise the signal would have distortion. Increasing the zero point and sudden mutations in the frequency range has a negative effect on dispersion characteristics 38 . Group delay waves are related to weal Bandwidth application.…”

A Low Profile Ultrawide Band Monopole Antenna for Wearable Applications

“…The pulse distortion can be analysed with the help of group delay and fidelity factor. Hence, linear phase variation in 21 or constant group delay is required for better transmission in UWB systems. From …”

“…These antennas must satisfy fundamental requirements like low cost, low profile, and directive radiation pattern. Various UWB antennas are designed and presented for wearable applications in [16][17][18][19][20][21][22]. To protect the human body from electromagnetic exposure, SAR values within acceptable range, and as specified by various regulating bodies like FCC, IEEE, and so forth [23,24], must be maintained by wearable antennas.…”