Describe the antenna properties, Other Engineering

Assignment Help:

Question:

(a) Describe the following antenna properties / characteristics:
(i) radiation pattern
(ii) the main beam and beamwidth
(iii) sidelobes
(iv) directivity
(v) antenna gain
(vi) efficiency
(vii) antenna resistance.

What would be the optimum values for (iii), (vi) and (vii) for a specific type of antenna of your own (e.g. monopole, dipole etc)?

(b) Evaluate the amplitude and direction of the principal maximum, the amplitude ratio of the largest secondary maximum (sidelobe) to the principal maximum and, the width of the principal lobe for the following linear arrays:

(i) 4 elements 0.4 λ apart and fed with equal amplitude and in-phase currents;

(ii) 12 elements λ/4 apart and fed with currents of equal magnitude but with a progressive phase shift of -90o between elements.

(c) Consider the array pattern (as normalized electric field, ET / E0 versus Φ , where Φ is measured from the line of the array, that is, 90o for broadside) for an array of 2 elements (considered non-directional radiators) spaced λ/2 apart fed with currents of equal amplitude and phase.

Determine, by the method of multiplication of patterns, the array pattern for an 8 element linear binomial array with λ/2 element spacing
and in-phase currents.

(d) For Question (c), determine the ratio ET / E0 for Φ = 0o, 45o, 80o and 90o.


Related Discussions:- Describe the antenna properties

Inheritance and polymorphism, The objective of this programming assignment ...

The objective of this programming assignment is to experience the use of inheritance in Java and to see how polymorphism works with inheritance in Java. The assignment involves wri

Fire precautions - fire protection engineering, Fire precautions - fire pro...

Fire precautions - fire protection engineering: Fire precautions include: Protecting escape routes in fire resisting construction, Providing fire doors between

Apu powerplant installation, Apu powerplant installation: The APU engin...

Apu powerplant installation: The APU engine mounts consist of a number of supports with vibration isolators fitted to the end of each support. The tubular supports are bolted

Physical significance of wave function , Wave function is a complex quantit...

Wave function is a complex quantity, which itself has no physical significance. But square of its magnitude gives the probability of finding a particle in a given volume of space a

Bipolar ic construction, BIPOLAR IC CONSTRUCTION: As mentioned earlier,...

BIPOLAR IC CONSTRUCTION: As mentioned earlier, the components that are commonly used in IC's are diodes, Transistors, resistors and capacitors.  Diffusing impurities into se

Product applications of powder metallurgy, Q. Describe two major product ap...

Q. Describe two major product applications of powder metallurgy. Ans. Following are some typical applications of powder metallurgy.         (i) Refractory metal : P

Engine protection devices - aircraft engine, Engine protection devices : ...

Engine protection devices : Described below are typical protection devices that will override any excessive demands made on the engine by the pilot or by the control units.

Aviation legislation - aircraft weighing, AIRCRAFT WEIGHING NOTE:     T...

AIRCRAFT WEIGHING NOTE:     The C.A.A. will consider applications from aircraft constructors and operators to weigh certain types of aircraft on a sampling basis. (i.e. repre

Organic, What happened when melonic acid heated

What happened when melonic acid heated

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd