![]() A low scattering microstrip antenna array has been designed by replacing the conventional metallic ground to a coding artificial magnetic conductor (AMC) ground 14. With the development of stealth and detection technologies, since the antenna array generally contribute significantly to the RCS of a military target, a lot of methods 13, 14, 15, 16, 17 have been proposed to obtain low-scattering feature. In addition, dielectric lens 9, 10, 11, 12, which is also called as director, is also utilized to enhance end-fire radiation performances at higher frequency of the AVA. Different kinds of slots, such as the elliptically shaped strip conductors 6 the exponential slot edge 7, multiple slots with varied lengths 8, etc., have been reported to realize impedance matching and high directivity. For improving the radiation performance of the AVA, such as gain, front and back ratio, bandwidth, radiation pattern, polarization and operating frequency range, the general method is to modify the physical geometry of the antenna, or add such as slot, corrugation, fractal shapes, dielectric lens to eliminate the undesirable effects of beam squint and cross polarization 5. However, there are some drawbacks 4 of the conventional Vivaldi antennas including the low-end bandwidth limitation, large size, and low gain. Thus, reducing its RCS while maintaining the radiation properties is crucial to military platform.Īntipodal Vivaldi antenna (AVA), which is a kind of end-fire traveling-wave antenna with UWB, high efficiency, small lateral dimension, easy manufacturing process, and so on, has been widely used in wireless and radar military applications 1, 2, 3. Antenna is a main contributing source to the overall radar cross section (RCS) of the military platform. The development of antenna arrays with miniaturization, ultra-wideband (UWB), high-gain, and low-scattering characteristics have attracted increasing attention. With the continuous escalation of information warfare, in the limited space of the combat platform, electronic systems with multiple functions need to be integrated to complete different tasks. The results verify the feasibility of improving the performance of antenna and the UWB low-scattering functionality. Furthermore, the array structure shows extremely low-observable capability, which is larger than 15 dB of the RCS reduction from 7.1 to 50 GHz with a ratio bandwidth of 7.0:1. Simulated and measured results show that the proposed low-scattering array has a 10-dB RCS reduction band ranging from 5 to 50 GHz at normal incidence for both polarizations. By loading an optimized Minkowski-shaped metasurface as the ground reflector, which combines the multielement phase cancellation (MEPC) and EM absorption technology, the 4 × 4 array realizes a low radar cross section (RCS) without the radiation performance degradation. The optimized element is fabricated and measured, the results demonstrate that the − 10 dB impedance bandwidth is 4.5–50 GHz with a ratio bandwidth ( f H/ f L) of 11.1:1, and the maximum gain at 35 GHz is 12.7 dBi, which are in good agreement with simulation. Periodic elliptical slots at the outer edges and a dielectric lens are utilized for antenna element to improve performances including miniaturized size, wide bandwidth, and high gain. This list is being further updated on a regular basis.This paper presents a miniaturized ultra-wideband (UWB) antipodal Vivaldi antenna (AVA) array with low-scattering characteristics integrated a hybrid diffusive-absorptive metasurface. A list of currently used antennasĪ detailed list of antennas has been mentioned below for your reference. Moreover certain applications would require several antenna and this may cause a confusion for novices. The next step is understanding the antenna type that would suit your application. You need to know the wavelength / frequency of the signal for the antenna, before beginning work on antenna design. Here we discuss basics of antenna design.Īntenna design begins by understanding your transmission requirements.
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