Abstract
A miniaturized balanced-to-unbalanced in-phase filtering power divider with wide upper stopband and wideband common-mode suppression is proposed. The in-phase feature is realized by the coupled/non-coupled lines. The stub with shunt-capacitor is used to realize the functions of filtering and miniaturization. The closed-form design equations are provided and discussed. To verify the design equations, one prototype with a center frequency of 1.0 GHz is designed and fabricated. The measured differential return loss is greater than 15 dB in the range of 0.82-1.22 GHz (39.2%). The upper stopband rejection is better than 20 dB from 1.41 to 3.57 GHz. Common-mode suppression is greater than 20 dB from 0 to 3.7 GHz. The measured results are in good agreement with electromagnetic simulations.
Highlights
Due to the function of splitting an input signal or combining two input signals, power dividers have been widely used in a large variety of microwave systems, such as antenna feeding networks [1] and power amplifiers [2]
The equivalent circuit of the proposed filtering power divider is shown in Fig. 1(c), which is symmetrical along line AA' except the phase inverter
When fractional bandwidth (FBW) is increased from 20% to 50%, the required value of Z1 is increased sharply
Summary
Due to the function of splitting an input signal or combining two input signals, power dividers have been widely used in a large variety of microwave systems, such as antenna feeding networks [1] and power amplifiers [2]. Balanced components like balanced power divider [3], balanced coupler [4], [5], and balanced filter [6], [7] with the advantages of good common-mode suppression (CMS) and high immunity to environmental and device electronic noise have been widely studied. Balanced-to-unbalanced (BTU) components are widely studied to avoid a larger size and realize common-mode rejection in the meantime. In [12], a BTU filtering power divider is proposed, but the usage of slot line transition structure occupies a large area. Wang et al.: A Miniaturized BTU In-Phase FPD With Wide Upper Stopband and Wideband CMS
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
