Which pattern is usually specified and measured for a reciprocal antenna?

The measurement and specification of the transmit pattern is crucial for a reciprocal antenna because it defines how effectively the antenna can radiate electromagnetic energy into space. This is especially important in communication systems, where maximizing the transmitted signal strength in the desired direction is essential for ensuring reliable connectivity to the receiver.

Reciprocal antennas, by their nature, operate equally well in both directions – meaning that the transmit pattern is directly related to the receive pattern. However, the main focus when specifying the pattern is often on the transmit characteristics, as these will have a significant impact on the coverage area and quality of the transmission. Understanding the transmit pattern allows engineers to optimize the placement and orientation of antennas to effectively cover the intended service area.

In practical applications, one typically analyzes the gain, directivity, and beamwidth of the antenna in the context of transmission to ensure that the signals are emitted efficiently and effectively to the receivers. This attention to transmit specifications helps in minimizing interference and enhancing overall communication performance.