What type of antenna is used in an...

What type of antenna is used in an...

Question 1 of 27070IeWfcKjUCpuWlqzBBIj8

What type of antenna is used in an aircraft’s Instrument Landing System (ILS) glideslope installation?

Question 1 of 27070

Q

What type of antenna is used in an aircraft’s Instrument Landing System (ILS) glideslope installation?

🔍 Key Concepts

• ILS glideslope is a UHF (ultra‑high frequency) guidance signal received by the aircraft, not transmitted from it. • Different aircraft nav systems (VOR/localizer, marker beacon, ADF) traditionally use different antenna types such as dipoles and loops. • Consider whether a glideslope receiver needs a simple fixed antenna or a complex electronically steerable array on the aircraft.

💭 Think About

• Which of these antenna types is most commonly associated with direction‑finding (bearing) equipment like ADF rather than simple vertical guidance reception? • Given that the aircraft only needs to receive a glideslope from ahead of the aircraft, does it make more sense to have an omnidirectional pattern or a more oriented reception pattern? • Which choice sounds like a realistically sized, common aircraft navigation antenna versus something typically used in high‑power ground systems or modern radar?.

✅ Before You Answer

• Remember the glideslope on the aircraft is a receiver antenna, not a transmitting ground antenna. • Check which listed antennas are known from basic avionics study: loop antennas are strongly associated with ADF/low‑frequency work; folded dipoles are common, simple RF antennas. • Ask whether an electronically steerable phased array is consistent with typical light‑aircraft or transport‑category ILS installations.