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We describe here the development of the Impulse Slot Antenna (ISA), which is a conformal ultra-wideband (UWB) antenna printed onto a non-conducting aircraft wing. This antenna, which looks out over the wingtip, will likely be useful in UWB radar applications with only limited space available for an antenna. We describe the fabrication and testing o...
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... the current application, we required an antenna covering a frequency range of 250 MHz to 2 GHz, which fits onto a 0.6 x 1.5 meter (2 X 5 ft.) aircraft wing. Furthermore, the antenna must be positioned to look to the side of the aircraft, as shown conceptually in Figure 1. Both low-profile TEM horn and tapered slot antenna (TSA) designs have been suggested to satisfy these requirements. ...
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... Figure 10, we compare the return loss or S 11 of the ISA and LTSA with cross-gap feed, and we observe that the magnitude of S 11 has been reduced significantly in the ISA. The impulse response of the ISA was measured in both azimuth and elevation planes, as shown in Figure 11 through Figure 13. ...
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... Figure 10, we compare the return loss or S 11 of the ISA and LTSA with cross-gap feed, and we observe that the magnitude of S 11 has been reduced significantly in the ISA. The impulse response of the ISA was measured in both azimuth and elevation planes, as shown in Figure 11 through Figure 13. On boresight, we observe a peak normalized impulse response of 1.5 m/ns, in a clean impulse with FWHM of 35 ps. ...
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... Figure 10, we compare the return loss or S 11 of the ISA and LTSA with cross-gap feed, and we observe that the magnitude of S 11 has been reduced significantly in the ISA. The impulse response of the ISA was measured in both azimuth and elevation planes, as shown in Figure 11 through Figure 13. On boresight, we observe a peak normalized impulse response of 1.5 m/ns, in a clean impulse with FWHM of 35 ps. ...
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... examining the performance of the ISA, we found it to be remarkably similar to that of the Farr Research 50-Ω TEM sensor, model TEM-1-50, shown in Figure 14, and described in [7]. We compare the TDR and S 11 of the two antennas in Figure 15. ...
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... examining the performance of the ISA, we found it to be remarkably similar to that of the Farr Research 50-Ω TEM sensor, model TEM-1-50, shown in Figure 14, and described in [7]. We compare the TDR and S 11 of the two antennas in Figure 15. The TDR of the ISA is less smooth than that of the TEM-1-50, and the return loss for the ISA is about 5 dB higher than that of the TEM-1-50. ...
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... TDR of the ISA is less smooth than that of the TEM-1-50, and the return loss for the ISA is about 5 dB higher than that of the TEM-1-50. Next, we compare the impulse responses of the ISA and TEM-1-50 in both the time and frequency domains in Figure 16. In the time domain we observe impulse responses of the two antennas that are remarkably similar. ...
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Citations
... As a variation on the dual STL configuration, we replaced the exterior STL with a variety of alternative antennas. These included a 9-in diameter half Impulse Radiating Antenna, a Farr Research model TEM-1-50 sensor [3], and an Impulse Slot Antenna [4]; all of which are shown in Figure 16. Each of these antennas was used in receive mode, while the interior STL transmitted. ...
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We describe the development of the Impulse Slot Antenna (ISA), which is a conformal ultra -wideband (UWB) tapered slot antenna, suitable for printing onto a nonconducting aircraft wing [1]. This antenna is designed to look out over the tip of a wing approximately 0.6 m wide by 1.5 m long. It is likely be useful in UWB radar applications having only limited space for an antenna. We describe the design, fabrication, and testing of the ISA; and compare its performance to that of a commercially available TEM horn
The frequency range of interest for the ISA is from 250 MHz to 2 GHz, and we built 1/8th-scale antenna models operating in the 2–16 GHz range. We constrained these models to make maximum use of the assumed 2:5 wing aspect ratio, initially investigating tapered slot designs having 50 Ω input impedance. However, none of these antennas exhibited satisfactory performance. This experience led us to develop the ISA, a hybrid antenna consisting of 200-Ωflattened biconical coplanar plates near the feed and a spline-tapered slot of gradually increasing impedance toward the aperture. The antenna is fed through a 200-Ωtwin-line by a 50-to-200-Ω splitter-balun.
The ISA out-performed its 50-Ω predecessor designs and performed nearly as well as the Farr Research Model TEM-1-50 sensor, which has a radiating element with nearly five times the area of the radiating elements of the scale model ISA. Moreover, the conformal ISA completely avoids the aerodynamic drag of a TEM horn, making it practical for use on an aircraft wing. We describe the 1/8th -scale ISA, and we compare its performance in terms of return loss, boresight gain, and antenna pattern to the Farr Research TEM sensor. Finally, we note some design improvements that should lead to improved performance in the next generation ISA
