Compact Unequal Power Divider with Filtering Response

Wei-Qiang Pan,Jin-Xu Xu,Kai Xu Wang,Xiao Lan Zhao

doi:10.1155/2015/658102

Wei-Qiang Pan, Jin-Xu Xu + Show 2 more

Open Access

https://doi.org/10.1155/2015/658102

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Abstract

We present a novel unequal power divider with bandpass responses. The proposed power divider consists of five resonators and a resistor. The power division ratio is controlled by altering the coupling strength among the resonators. The output ports have the characteristic impedance of 50 Ω and impedance transformers in classical Wilkinson power dividers are not required in this design. Use of resonators enables the filtering function of the power divider. Two transmission zeros are generated near the passband edges, resulting in quasielliptic bandpass responses. For validation, a 2 : 1 filtering power divider is implemented. The fabricated circuit size is 0.22λg × 0.08λg, featuring compact size for unequal filtering power dividers, which is suitable for the feeding networks of antenna arrays.

Highlights

Power dividers are widely used in radio frequency (RF) frontends, such as in power combining networks and antenna arrays [1, 2]
Impedance transformers are required at the two output ports in unequal power divider designs [3]
Based on the schematic of the classical Wilkinson power divider shown in Figure 1, lots of power dividers have been designed in recent years, including the high power division ratio dividers [4], the arbitrary power division ratio ones [5], out-of-phase ones [6], dual-band ones [7, 8], and spurious-suppressed ones [9, 10]

Summary

Introduction

Power dividers are widely used in radio frequency (RF) frontends, such as in power combining networks and antenna arrays [1, 2]. Impedance transformers are required at the two output ports in unequal power divider designs [3]. The filtering circuits can be used to replace the impedance transformers at the output ports of unequal power dividers, resulting in dual functions [14]. The circuit size of the above two unequal designs needs to be reduced. The filtering and power splitting circuits can be highly integrated together [15,16,17,18]. This method has not been applied to unequal filtering power divider designs. A novel unequal power divider with filtering responses is proposed. Good power division and bandpass responses are observed in the experiment

Analysis and Design of the Proposed Filtering Unequal Power Divider

Experiment

Conclusion