Cylindrical-cavity-based multi-way power dividers/combiners with higher isolation for millimeter wave applications

Cylindrical-cavity-based three and four-way power combiners/dividers are presented with $ TM_{020} $ TM020 mode. The 3-way power divider is waveguide-based, and the 4-way power divider uses a hybrid structure. Isolation is a significant issue for a radial/cylindrical-cavity-based power divider. These designs have improved it by using open-cut or dielectric-filled elliptical slots at appropriate locations in the cylindrical waveguide. The achieved isolation is better than 20 dB between the adjacent ports and 17 dB for the opposite ports for the 4-way, while it is 23 dB for the 3-way power divider. Although the design prototype is validated at 26 GHz for a bandwidth of 2 GHz, it is also suitable for mm-wave band applications. Hence, a compact, low-loss power divider that can be easily implemented for higher frequencies using a hybrid technique with high isolation has been demonstrated. It addresses the challenge of poor isolation, which makes it useful for versatile applications. Particularly in satellite applications, better isolation ensures less impact on the system in case of any amplifier failure.