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When an antenna has a gain of 44dB then assuming that the main beam of the antenna is circular in cross-section the beam width will be?
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∙ 14y ago
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∙ 14y ago
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What are the disadvantages of horn ANTENNA?
Directional diagram width depends on the physical size of antenna. In order to get beam radiation antennas are made with a long horn. It's better when it is in proportion to an aperture square, i.e. of a peak cross-section LH or LE, and a directional diagram width is in inverse proportion to LH or LE in the first power.Therefore in order to make a directional diagram N times narrower the aperture width must be broadened by N times and the horn must be lengthened by N2 times. The horn must be excessively lengthened to get a higher gain which is very inconvenient. In this case mirrors and lenses are used in the horn aperture.Use of a horn as an irradiator of a parabolic antenna presents a whole new device which is distinguished for its narrow directional diagram and low level of side lobes.
What is the formulae for the fineness ratio?
Length/ Max width
What is difference between Rectangular Waveguide and Circular Waveguide?
Rectangular waveguide and circular waveguide are metal hollow structure used to guide EM waves. Depending upon their shapes they are classified as rectangular or circular. They are basically a passive microwave device and acts like a High Pass Filter. Rectangular waveguide : It is the earliest kind of the transmission lines. It supports supports TM and TE modes. It does not support TEM waves because it has only one conductor and cannot define a unique voltage. Conductor is filled with a material that has material with permittivity e and permeability m. Cutoff wavelength equation for is define below. λc = 2/ Here, m= number of half-wave along broad side dimension, N= number of half-wave along the shorter side. Circular Waveguide: It maintains a uniform circular cross section along their length. The cutoff frequency is unique for a specific waveguide mode that is assumed to be propagating in a waveguide of a given diameter and determines the lower frequency of the waveguide’s operating frequency range. The cutoff frequency is calculated using the following formula:
What is the relationship between channel width and drain current?
if channel width decreases , the drain current(Id) will also decrease . but , Id will decrease up to a certain limit , when the jfet is in pinch off condition i.e. channel width is tends to zero (Vgs is very high) the Id will be constant then.
What is difference between early effect and punch through in BJT?
When we apply reverse bias voltage to input and output sides of a BJT, then the width of the depletion layer at emitter-base and base-collection got increased. Due to which the effective base width got decreased. This phenomenon of reduction in the base width is called Early effect. And if we go on increasing the Reverse bias voltage then at a time instant the width of the base becomes zero and this effect is called punch through effect and that reverse bias voltage is called punch through voltage.
What is the difference between diameter and width?
Diameter is equivalent to the width of a circular object. Width is the shorter side of a non-circular two-dimensional object. The longer side is considered the length.
What is the area of the park if diameter of circular park is 14meter and width is 3.5meter?
The answer depends on whether the width is inside the 14 metre circle or outside.
180 inches in diameter is how many inches in width?
Diameter is the width of a circular or spherical figure or object. Something 180 inches in diameter is also 180 inches in width or thickness.
Can you only use diameter for circular objects?
That's a good question. I have never thought about that. But yes, for anything excluding circular objects, length and width are used.
How can you find the perimeter with only the width?
You can't: perimeter = 2 x (length + width), assuming you're talking about a rectangle.
What is the length and width of 0.33 acres of land?
The area of a plot of land is not enough information to determine its dimensions. First of all, there is no justification for assuming that the shape is rectangular. It could be circular, triangular or even irregular. Even if you know that it is rectangular you still do not have enough information to determine its dimensions. Double the length, halve the width and the area remains the same. Or treble the length, reduce the width to a third - same result. There are infinitely more options
What is the surface area of a circular cylinder with the height of 11 and the width of 8?
Surface area is 376.99 units2
If the length of a rectangle is doubled does the area double?
Assuming no change in the width, yes.
Finding the area of a room?
length X width, assuming that it is a perfect rectangle.
How do you find perimeter with length and width?
assuming the shape is a quadrilateral, multiply the length by two then multiply the width by two and add those two together for your answer
How do you find an area if the width is 2 and the length is 1?
Assuming the area is rectangular, the area is width * length = 2*1 = 1 square unit.
If the length is 130 and the width is 96 what is the perimeter?
Assuming you're talking about a rectangle, 452.
