Dual-Band Filtering Power Divider Based on a Single Circular Patch Resonator With Improved Bandwidths and Good Isolation
Qiyun Zhang, Gang Zhang, Zhengkang Liu, Wang Chen, Wanchun Tang
Abstract
In this brief, a novel compact single circular patch dual-band (DB) filtering power divider (FPD) is proposed for the first time. In this design, the modified TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> resonance mode (i.e., TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> ’ mode) is developed by introducing a metallic via in the center of the patch, while four additional same metallic vias are placed in the patch to control the generated TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> ’ mode and the TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">21</sub> mode. In addition, vertical slot perturbations are investigated to control the TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> mode and the TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">31</sub> mode, while the transversal slot perturbation loaded with three resistors is exploited to achieve good isolation. In this context, with elaborate exploitation of these resonant modes, two passbands can be attained, correspondingly. The lower passband is formed by TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> ’ and TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> modes, while the upper passband is constituted by TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">21</sub> and TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">31</sub> modes, respectively. For validation, a prototype is implemented. Results exhibit relative compact size, wider bandwidths, nice return losses, as well as decent isolation.