0
Horn Antenna is best exited by waveguide
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
Effects caused by opening angle of a pyramidal horn antenna?
The opening angle of a pyramidal horn antenna is to match the impedance of the horn antenna to that of free space. With this enlargement of the dimension, the velocity of the wave travelling will decrease. This will increase the guide wavelength, which in turn increases the impedance of the horn. This gives an impedance value closer to that of free space there by giving better power transfer.
What are the uses of pyramidal horn antenna?
AnswerGAND MARAOpyramidal horn are antennas in which the walls of the rectangular wave guide are flarredin both e-plane & h-plane directions.applications:---> when there is a high gain requirement.--> when there is high directionality requirement.
How do you test a microstrip antenna?
A micro-strip antenna works on the principle of resonant cavity (short circuit walls on top and bottom, open circuit walls on the sides).A resonant cavity stores energy unlike transmission lines or wave guide which transmits electromagnetic energy from one part to another. A R.C is equivalent to LC device at low frequencies.
Why do radio waves with extremely long wavelengths such as ELF radio waves need huge antennas?
Answer: An antenna is a tuned circuit, so it have to be tuned to the wavelength of the signal that it will transmit. If the antenna is not tuned properly some of the transmitted power will be feed back to the transmitter and will damage the output stage, SWR (Standing Wave Ratio) is very important, that is the ratio between the power that is transmitted by the antenna and the power that is fed back to the transmitter a zero is ideal but not always possible.The lower the frequency the longer the wave length and a 1/4 wave length is the minimum length that will give one a good SWR. The formula to use when one design a antenna is 300/frequency in MHz, if the frequency is 30 MHz then it is 300/30 = 10 Meter divide it by 4 to get the length of the 1/4 wave antenna that is 2,5 meters.Note: The antenna have to be multiples of a 1/4 wavelength like 1/2 wave or full wave, a 5/8 length can be used but it will need a L/C circuit at the input of the antenna to tune it to the frequency.
Why antenna height is at least quarter wavelength for radiating from it?
A transmitter antenna is a tuned circuit and it can be very complex and it even get more difficult at higher frequencies, if it's not a 1/4 wave length of the transmitter frequency it is un tuned and you will have some of your RF power radiated back to the transmitter, that is called SWR, for Standing Wave Ratio and it will damp the RF that is radiated from the antenna and if the SWR is to high it can damage the transmitters final stage. It don't have to be the real physical 1/4 or 1/2 wave and it can even be 5/8 of the wavelength but then a L/C circuit have to be inserted at the input side of the antenna to tune the antenna to the correct frequency one antenna can even be used for two different frequencies, then a L/C tuning circuit have to inserted at a 1/4 wave length of the higher frequency , this type of antenna is used in duplex systems, like a cell phone.
Why are guide dogs unlikely to get excited when another dog approach?
Training. Guide dogs are trained not to get overly excited in most situations because they need to keep the person they are guiding safe.
End fire antenna?
end-fire antenna = surface-wave antenna
Why does the rav4 have an antenna?
The Rav4 has an antenna for the same reason that most vehicles have an external antenna, to optimize radio wave reception.
How do you use lecher antenna?
To get the wave signal
What is the half wave dipole?
effective height of half wave dipole antenna
What is the wave source of a radio wave?
The source is the RF current in the transmitting antenna.
What are the properties of a radio wave?
Properties of radio wave ar: sound, uses of antenna, hz.
What has the author William Heriot Watson written?
William Heriot Watson has written: 'The physical principles of wave guide transmission and antenna systems' -- subject(s): Antennas, Electric waves, Radio
Is the emission of electromagnetic radiation by an excited atom is it a wave or a particle?
a particle traveling in wave form.
Effects caused by opening angle of a pyramidal horn antenna?
The opening angle of a pyramidal horn antenna is to match the impedance of the horn antenna to that of free space. With this enlargement of the dimension, the velocity of the wave travelling will decrease. This will increase the guide wavelength, which in turn increases the impedance of the horn. This gives an impedance value closer to that of free space there by giving better power transfer.
Is the emission of electromagnetic radiation by an excited atom a wave or particle theory?
wave theory of light
Radiation resistance of quarter wave monopole antenna is?
The radiation resistance of quarter wave monopole is 36.5 ohms
