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High Gain Antenna

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A high gain antenna is the antenna with very high antenna gain. We can consider antenna gain as concentration ratio of input power. Using Yagi-Uda array, traveling wave, aperture, and parabolic ...

A high gain antenna is the antenna with very high antenna gain. We can consider antenna gain as concentration ratio of input power. Using Yagi-Uda array, traveling wave, aperture, and parabolic reflector, we can design a high gain antenna.

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    High Gain Antenna High Gain Antenna Presentation Transcript

    • Antenna Engineering CHO, Yong Heui High Gain Antenna
    • Introduction 1. Yagi antenna
      • Yagi-Uda antenna: parasitic array
      • 1926 at Tohoku University, Japan
      • End-fire traveling-wave antenna
       Yagi antenna: one source
    • Operational principle 1. Yagi antenna
      • Reflector, driver, and director
      • Input impedance: capacitive or inductive loading
      • Gain: about 10 dBi
    • Introduction 2. Traveling wave
      • Traveling-wave long wire antenna
      • Beverage antenna (wave antenna): Harold H. Beverage in 1922
      • Traveling-wave vee antenna
      • Rhombic antenna
    • Radiation pattern 2. Traveling wave
      • Input impedance: almost real
      • Traveling wave: surface wave and leaky wave
       Rhombic antenna
    • Introduction 3. Aperture antenna 
      • Horn antenna: sectoral horn, pyramidal horn, conical horn
    • 4. Reflector antenna Parabolic antenna 
      • Symmetric mounting
        • Masking effect: aperture blocking and diffraction
        • Spillover: ground noise
      • Offset mounting
        • Small antenna: 1 ~ 4 m (diameter)
        • Spillover: ground noise
      • Cassegrain mounting
        • Parabolic and hyperbolic reflectors
        • Spillover: sky noise
    • 4. Reflector antenna Cassegrain antenna 
    • Introduction 5. Array antenna
      • Antenna gain vs. loss
        • : number of elements
        • : distance from feeder to element
        Array antenna