COUPLING LINE

摘要

PURPOSE:To make the reception level stable by making a difference between a radial electric field component and a circumferential electric field component to less than 20dB in a two-layer spiral coupling line for car radio. CONSTITUTION:The winding pitch P2 of a spiral outer conductor is selected so that a difference between the radial electric field component Er and the circumferential electric field component E0 is 20dB or below in the coupling line of two-layer spiral structure including a magnetic core. Thus, the reception level of a car is made stable remarkably.