Miniaturized Dual-Band Dual-Mode TM-Mode Dielectric Filter in Planar Configuration

Abdulrahman Widaa,Michael Hoft

doi:10.1109/jmw.2022.3145906

Abstract

This paper reports a new class of compact inline dual-band bandpass filters using TM-mode dielectric resonators in planar configuration. Thanks to the employment of the dielectric-loaded TM-mode waveguide configuration and the dual-mode TM120 and TM210 resonances, substantial size miniaturization and volume saving (>70%) can be obtained in comparison with conventional waveguide technology. Additionally, the planar topology of the presented concept offers highly desirable advantages for industry and mass production including the ease of manufacturing, assembly, and tuning. Furthermore, the resonating doublets and the nonresonating TM110 mode are effectively utilized to introduce and control both inter-band and outer-band transmission zeros, advantageously increasing the isolation between the two passbands and enhancing the outer-band rejection regions. The general design procedure of the proposed filter is discussed in detail. A three-pole C-band dual-band dual-mode TM-mode dielectric filter is designed, implemented, and measured to validate the proposed configuration.

Highlights

The Current rapid development of multi-channel/multistandard RF and satellite communications have urged the demand for more efficient, compact, and lightweight multiband payloads and subsequent filtering units
The TM-mode dielectric resonator that has been used is an E6045 from EXXELIA [24] with the same dimensions stated in the above section
The TM-mode dielectric resonators are soldered in a compact metallic housing milled out of copper

Summary

Introduction

The Current rapid development of multi-channel/multistandard RF and satellite communications have urged the demand for more efficient, compact, and lightweight multiband payloads and subsequent filtering units. A third-order dual-band filter was introduced in [10] using dielectric resonators to offer a more compact size and higher Qu than the other configurations. The following sections discuss the design procedure of the proposed topology and report the measured results of a three-pole dual-band dual-mode TM-mode dielectric resonator filter.

Results

Conclusion