Determination of the phase center position and delay of a Vivaldi antenna

Abstract

We propose a new method for the antenna phase center determination based on measurement. The phase center position and the delay of wave propagation through a Vivaldi antenna are estimated from the measured arrival-time of a multi-offset transmission signal. The estimated phase center position agrees well with that determined by a numerical simulation. The estimated delay has also been validated to have a good accuracy by a laboratory experiment. Then we demonstrate that the accuracy of the range distance estimation by a radar system using a Vivaldi antenna can greatly be improved by considering the phase center position.

Post-Earthquake Damage Inspection of Wood-Frame Buildings by a Polarimetric GB-SAR System

“…The details of the method and the experiment procedure are described in [24]. The phase center position of the Vivaldi antenna is estimated to be located 2.0 cm away from the antenna aperture towards the antenna feeding point.…”

“…The precise knowledge of the location of the antenna phase center is important for the accurate ranging. Moreover, it is also significant for SAR processing, because it accurately simplifies an antenna as a point source [24]. We used a multi-offset transmission measurement for locating the apparent phase center position.…”

“…We used a multi-offset transmission measurement for locating the apparent phase center position. The details of the method and the experiment procedure are described in [24]. The phase center position of the Vivaldi antenna is estimated to be located 2.0 cm away from the antenna Figure 4.…”

High efficiency broadband ellipse antenna array with tapered parallel-double transmission line feed network

“…In literature, diverse methods are studied and adopted to achieve a wide IBW. Generally, the configuration of radiating element can impact the bandwidth significantly, and most of wideband antenna arrays use specially designed radiating element to enhance impedance bandwidth, such as stacked antennas [1,2,3,4] and Vivaldi antennas [5,6,7,8,9,10]. In [1], the five-layer stacked antenna could reach a broad IBW of 36.15% for VSWR 2.…”

“…However, this kind of stacked antenna suffers from expensive cost and high loss. On account of the broadband performance, Vivaldi antenna can be a good candidate as an element [5,6,7,8,9,10] for antenna array. As reported in [5], the Vivaldi antenna could operate over a 2-18 GHz, however, the antenna led to a high profile of 0:7 (where λ is the wavelength in free space).…”