Radio Astronomy (Finished)

Spring, 2023
蹭课计划😅

2023.3.7, Basic anteneas

Question:
What does antena do?

Answer:
When receiving a radio wave:

• An antenna is a device that converts electromagnetic radiation into electrical current

When transmitting a radio wave:

• An antenna is adevice that voncerts electric current into electromagnetic radiation

Requirements for using the antenna:

• Angular resolution (Sharp beam)
• Sensitivity (Gain)

Altazimuth mount, Equatorial mount

Antenna performance indicators

• Antenna gain:
  quantifies the output power relative to the strength of the received radio waves.
  In short, its an indicator of sensitivity and directional response.😀
  
• Effective collection area:
  The larger the $A_e$, the larger the power $P_\nu$
• Angular resolution

Questions left:

• Beam?
• Convolution?