Although a resonant antenna has a purely resistive feed-point impedance at a particular frequency, many (if not most) applications require using an antenna over a range of frequencies. An antenna's bandwidth specifies the range of frequencies over which its performance does not suffer due to a poor impedance match. Also in the case of a Yagi-Uda array, the use of the antenna very far away from its design frequency reduces the antenna's directivity, thus reducing the usable bandwidth regardless of impedance matching.
Although a resonant antenna has a purely resistive feed - point impedance at a particular frequency , many ( if not most ) applications require using an antenna over a range of frequencies . An antenna 's bandwidth specifies the range of frequencies over which its performance does not suffer due to a poor impedance match . Also in the case of a Yagi - Uda array , the use of the antenna very far away from its design frequency reduces the antenna 's directivity , thus reducing the usable bandwidth regardless of impedance matching .
What is lessened by the Yagi-Uda design?
What is lessened by the Yagi - Uda design ?
directivity
directivity