Design and characterisation of HE₁₁ dual-mode dielectric-loaded filter for cellular base station applications

ABSTRACT

This paper presents a $H{E}_{11}$ dual-mode dielectric-loaded bandpass filter for cellular base station applications. The filter consists of a ceramic puck that is placed centrally on the base of a metallic housing. The resonator offers a size reduction ratio of approximately 7:1 compared with equivalent air-filled coaxial filters. The filter is designed at a resonant frequency of 2.05 GHz and bandwidth of 50 MHz. The spurious-free window (SFW) was 500 MHz from the fundamental frequency. A fourth order dual-mode bandpass filter is designed, fabricated, and tested to validate the proposed approach. A good agreement between the measurement and simulation results is demonstrated.

KEYWORDS:

• Dual-mode
• dielectric resonator
• compact size
• bandpass filter
• base station filters

Disclosure statement

No potential conflict of interest was reported by the authors.