A Low-Profile Balanced Dielectric Resonator Filtering Power Divider with Isolation

Area of Science:

• Electrical Engineering
• Electromagnetics
• Microwave Engineering

Background:

• Traditional metal-cavity dielectric resonator filter power dividers face structural limitations in incorporating isolation enhancement.
• Achieving high isolation and low profile simultaneously in filtering power dividers is a persistent challenge.

Purpose of the Study:

• To propose and demonstrate a balanced dielectric resonator filtering power divider with improved isolation performance and a reduced profile.
• To effectively achieve differential-mode filtering, power division, and common-mode suppression.

Main Methods:

• Utilizing the coupling of TE111y modes between three rectangular dielectric resonators.
• Implementing balanced feed structures for filtering and power division functions.
• Introducing isolation resistor structures within a hollow stacked substrate design to enhance isolation.

Main Results:

• Effective differential-mode filtering, power division, and common-mode suppression were achieved.
• The proposed design allows for the integration of isolation structures, unlike traditional designs.
• The fabricated prototype demonstrated a low profile (0.66 λg) and isolation greater than 15 dB at 11.65 GHz.

Conclusions:

• The proposed balanced dielectric resonator filtering power divider offers a significant improvement in isolation and profile.
• The novel integration of isolation resistors addresses limitations of conventional designs.
• The design is suitable for applications requiring compact and high-performance filtering power dividers.