TAILIEUCHUNG - Radar technolog Part 13

Tham khảo tài liệu 'radar technolog part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 17 Wideband Antennas for Modern Radar Systems Yu-Jiun Ren and Chieh-Ping Lai Advanced A M Technologies Inc. . 1. Introduction Wideband antennas have received much attention in wireless communications and broadcasting systems. With a wide bandwidth the signals can be transmitted by ultra-short impulses or by using multi-band groups. More information and applications can be carried through the radio frequency channels with a high data rate and accuracy. Also there are numerous military and commercial sensing systems that require wide bandwidth to increase the range accuracy imaging resolution jamming anti-jamming and hardware flexibility. For various modern radars such as air defense air traffic control astronomy Doppler navigation terrain avoidance and weather mapping the design of wideband antennas would have different considerations and specifications in order to meet the requirements of specified signals and waveforms. The key issues of emerging radar antennas are low-profile low cost conformal and compact design. Currently many researchers focus on omni-directional wideband antennas because their widely-covered beamwidth enables them to detect and communicate with targets anywhere. However this may cause the radar to confuse where the target is located. Therefore in certain aspects directional antennas present more interest. The effective isotropic radiated power of a directional antenna is directed to reduce power consumption at the transmitter. This is also beneficial for the receiver s link budget. According to the radar range equation the antennas can significantly determine the radar performance owing to its power handling aperture dimension beamwidth resolution and potentials of beamforming and scanning. It may spend large amount of the budget for the antenna system cost depending on required functions. In this chapter we investigate state of the art wideband radar antennas and focus on applications for airborne radars ground penetrating radars noise

TỪ KHÓA LIÊN QUAN
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.