Read about the role of an index number in economics and how index numbers can be applied to all kinds of data, such as ...

Abstract: A novel decoupling method using coupling stubs is presented to design a wideband 8 × 8 multiple-input–multiple-output (MIMO) array. The array element consists of two tightly coupled printed ...

Learn how index funds invest in market indexes like the S&P 500 for broad diversification and market performance replication.

Abstract: Due to the availability of maintaining the orthogonality between transmit signals and effectively leveraging time resources, the Doppler division multiplexing (DDM) method has been widely ...