Connectors HDH Series Features - The high frequency characteristics feature, a high degree of matching, and high isolation. - Power uniform distribution and 90 degree phase difference type(HDH-H type) - Corrosion-resistant aluminum case and the Hirose Electric unique pattern design using a stripline triplate method, enables the couplers to be miniature and lightweight. - The outer shell and conductor of the SMA connector (Hirose HRM series) is stainless steel for durable coupling. - Full variations of degrees of coupling over 6dB are available. (HDH-I type)