Recent questions tagged gate2016-ec-1

The current density in a medium is given by $${\overrightarrow J= \frac{400 \sin\theta}{2\pi(r^2+4)} \hat {a}_r \: Am^{-2}}$$The total current and the average current den...

An antenna pointing in a certain direction has a noise temperature of $50 \: K$. The ambient temperature is $290 \: K$. The antenna is connected to a pre-amplifier that h...

Two lossless X-band horn antennas are separated by a distance of $200 \lambda$. The amplitude reflection coefficients at the terminals of the transmitting and receiving a...

The electric field of a uniform plane wave traveling along the negative $z$ direction is given by the following equation:$${\overrightarrow {E}^i_w= ( \hat {a}_x+ j\hat {...

The far-zone power density radiated by a helical antenna is approximated as:$${\overrightarrow W_{rad}= \overrightarrow W_{average} \approx \hat {a_r}C_0\frac{1}{r^2}\cos...