Antennas in Electronic Communication

Directional High Frequency Antenna

Directional High Frequency Antenna: Directional High Frequency Antenna are likely to differ from lower-frequency ones for two reasons. These are the HF transmission/reception requirements and the ability to meet them. Since much of HF communication is likely to be point-to-point, the requirement is for fairly concentrated beams instead of omnidirectional radiation. Such radiation patterns are …

Directional High Frequency Antenna Read More »

Effects of Antenna Height

Effects of Antenna Height: At low and medium frequencies, where wavelengths are long, it often becomes im¬≠practicable to use an antenna of resonant length. The vertical antennas used at those frequencies are too short electrically. The Effects of Antenna Height are Top loading: The actual antenna height should be at least a quarter-wavelength, but where this …

Effects of Antenna Height Read More »

Effects of Ground on Antenna Performance

Effects of Ground on Antenna Performance: The Effects of Ground on Antenna Performance on a detailed discussion of the interaction (see Figure 9-11). Ungrounded Antennas: As was know, when a radiation source is placed near a reflecting surface, the signal received at any distant point is the vector sum of the direct (sometimes called the incident) …

Effects of Ground on Antenna Performance Read More »

Radiation Pattern of Antenna

Radiation Pattern of Antenna: The important terms and definitions used in connection with antennas and their Radiation Pattern of Antenna are Antenna Gain and Effective Radiated Power: Certain types of antennas focus their Radiation Pattern of Antenna in a specific direction, as compared to an omnidirectional antenna. Another way of looking at this concentration of …

Radiation Pattern of Antenna Read More »

Antenna Characteristics

Antenna Characteristics: The following Antenna Characteristics isolated from surfaces which will alter or change their radiation patterns and efficiency. Current and Voltage Distribution: When an RF signal voltage is applied at some point on an antenna, voltage and current will result at that point. Traveling waves are then initiated, and standing waves may be established, …

Antenna Characteristics Read More »

Scroll to Top