Printed High Power E-Plane Filters with Spurious-Free Response

Conventional high power E-plane metal insert bandpass filters produce spurious responses which appear between the desired passband and twice the midband frequency. This paper presents a design proposal which eliminates all spurious passbands in that frequency range up to more than twice the midband frequency of the operating bandwidth. The solution is based on a series connection of two or more individual E-plane filters which provides significantly improved stopband attenuation up to very high frequencies.