Match column A with column B.

Column
1. Point electromagnetic source
2. Dish antenna
3. Yagi-Uda antenna

Column
P. Highly directional
Q. End fire
R. Isotropic

The radiation pattern of an antenna in spherical co-ordinates is given by $$$F\,(\theta )\, = {\cos ^4}\,\theta \,\,\,;\,\,0\,\, \le \,\,\theta \,\, \le \,\,\pi /2$$$ The directivity of the antenna is

For a Hertz dipole antenna, the half power beam width (HPBW) in the E-plane is

A transmission line is feeding 1 Watt of power to a horn antenna having gain of 10 dB. The antenna is matched to the transmission line. The total power radiated by the horn antenna into the free-space is