The question is in relation to the antenna analysis. Which of the statement below is correct?Select one:a.A half wave dipole antenna has a maximum directive gain of 2.15 dBb.A long antenna is required to reduce radiation resistancec.A half wavelength dipole has a maximum directive gain of 2.15 dBid. Image theory is use to increase antenna radiated power and directivitye.A half-wave length dipole antenna has a radiation resistance of 50 Ohms

The standard reference antenna for the directive gain is Select one:a. hypothetical antenna having equal radiation in all directions. b. yagi uda antennac. quarter dipole antennad. half dipole antenna

For an antenna the following is true:Select one:a.The fractional antenna bandwidth is defined in dBib.When gain measured with a dipole antenna the gain in dB expressed in dBic.The absolute gain in dBi is measured with two identical antennas The fractional antenna bandwidth is defined in dBid.Gain is the maximum directive gain of an antennae.The resonant length of a fundamental mode rectangular patch antenna is lambda

Choose all the correct statements. Wrong answers will be penalized Question 9Select one or more:a.If the progressive shift in an antenna array is equal to zero, the radiation produced is “end-fire”b.A large loop antenna has a higher radiation efficiency compared to a dipole antenna.c.Gain is the parameter that defines how well an antenna focuses its radiation at a particular direction.d.Conduction loss occurs at the interface between the transmission line and antenna.e.To receive signal at a particular frequency, a loop inductor must be used to form a resonant circuit to tune towards that frequency.f.The value of PLF of two antennas without polarization mismatch is equal to 0 dB.

The centre of a half-wave dipole is placed at the origin of the standard spherical coordinate system with the wire parallel to the z axis. This centre-fed dipole is in resonance at 0.9 GHz and the total radiated power is 200 W.(a) Calculate the effective height vector in the xy plane (θ = 90°).(b) Find the electric field vector (peak value) radiated by the dipole in the far-field region.(c) A second similar dipole is also placed in the xy plane parallel to the first at a distance of 1500 m. Neglecting losses and assuming the free-space condition, calculate the voltage U (peak value) induced in the dipole, i.e. the voltage in the equivalent receiving circuit.(d) Based on the voltage U, calculate the maximum rms power available at the matched load

Antenna manufacturer has decided to modify the antenna but with three times the effective aperture area of the previous antenna and keeping wavelength constant. The gain of the modified antenna will be ________Select one:a. same as the gain of original antennab. 9 times the gain of original antennac. three times the gain of the original antennad. twice the gain of original antenna