Comparison of Frequency Diverse Array Patterns with Nonuniform Frequency Offset

Frequency Diverse Array (FDA) radar is a new type of radar technology proposed in recent years. It generates a range-dependent beampattern through a small frequency increment among the antenna elements, which overcomes the weakness of phased-array in this respect, so it has many potential applications. However, in a traditional frequency diverse array with a fixed frequency offset, the transmit beampattern has coupling range and angle response. In order to decouple the range-angle beampattern response, a frequency diverse array with a nonuniform frequency offset is proposed. In this letter, three types of FDA with non-uniform frequency offset are described, and their performance is compared through numerical analysis, such as low side-lobe.