Choose the correct answer?

note: mcq must be correct from the source.

Subject : Antennas and propagation

Sources (Antenna_Theory_Analysis_and_Design_3th&4thEdition)

materialsheets link : https://drive.google.com/file/d/1BsAOAv7ihL3vrdEFIH1Nv8zySY7awbte/view?usp=sharing

The directivity of the rectangular horn antennas can be increased by:* 1 O none of these. O tapering the field at the aperture. O increasing the aperture area. O applying linear phase shift across the aperture The input impedance of a half-wavelength folded dipole compared to that of a regular half-wavelength dipole is * 2 four times. O none of these. O three times. O Twice.The antenna which has the smallest bandwidth among the following is: * O Bioonioal dipole. e O Mierostrip antenna. 0 Monopole in the form of a thin wire. 0 Folded M2 dipole. The beam width of the mierostrip patch antenna is about * O 100 deg. 0 none of these. Microstrip antennas are characterized by: * 5 high loss and small bandwidth. low loss and high Q-factor. high loss and large bandwidth. low loss and low weight. The antenna which has the largest gain among the following is the:- * O X-Band H-plane sectoral horn. 6 O X-Band Pyramidal horn. O X-Band open-end wave guide. X-Band E-plane sectoral horn.A lossless aperture antenna has a gain of 12 dB and overall physical area of 1.5 Lamda2. The aperture efficiency of the antenna is: * O none of these 7 O 53% O 100% O 35% The folded dipole has .bandwidth in comparison with the ordinary dipole: larger 8 O none of these. O lower O same