pulmonary
发表于 2025-4-1 02:23:05
Reflector Antennas,int telecommunication links, on houses for pay tv and in news items of spacecraft travelling to distant galaxies. This chapter provides an introduction to reflector antenna fundamentals for design and analysis. The history of the focusing properties of reflectors extends back to ancient times, but s
加剧
发表于 2025-4-1 07:59:51
Spiral, Helical, and Rod Antennas, time-domain method, the beam-propagation method, and the finite element method are employed to clarify the operation principles of spiral, helical, and rod antennas. A novel type of spiral antenna (a metamaterial-based spiral antenna) can provide a dual-band counter-circularly polarized wave. Since
怕失去钱
发表于 2025-4-1 13:48:22
Dielectric Resonator Antennas,ls for different shapes of DRAs were established in the 1980s and 1990s to understand their radiation properties. A couple of excitation schemes have also been proposed so that the DRAs can be excited efficiently. With the rapid advancement of dielectrics and microfabrication technologies in recent