Design of a New Balanced-to-Balanced Filtering Power Divider Based on Square Patch Resonator

A new balanced-to-balanced filtering power divider based on the square patch resonator is proposed in this paper. Originating from the field distributions of degenerate modes on the square patch resonator, a prototype of the balanced-to-balanced power divider is successfully developed with only one...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2018-12, Vol.66 (12), p.5280-5289
Main Authors: Liu, Qianwen, Wang, Jianpeng, Zhu, Lei, Zhang, Gang, Wu, Wen
Format: Article
Language:English
Subjects:
Balanced-to-balanced circuit
Band-pass filters
bandpass filter
Bandpass filters
Circuit design
common mode (CM)
Design modifications
differential mode (DM)
Division
Filtering
Frequency conversion
Harmonic response
harmonic suppression
Microstrip
Power dividers
Prototypes
Resonant frequency
Resonators
Selectivity
square patch resonator
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Summary:A new balanced-to-balanced filtering power divider based on the square patch resonator is proposed in this paper. Originating from the field distributions of degenerate modes on the square patch resonator, a prototype of the balanced-to-balanced power divider is successfully developed with only one square patch resonator. Its working principle can be fully explained by the field distribution of the relevant resonant modes. Afterwards, to achieve the sharp skirt selectivity outside the passband, a compact second-order circuit is constructed based on the original prototype. With this new structure, both good bandpass filtering response and power division characteristics are well obtained. Moreover, to suppress the differential-mode (DM) harmonic response in the upper stopband, an improved structure is built up by modifying the feeding scheme. Ultimately, to validate the design concept, both the two types of second-order balanced-to-balanced filtering power dividers operating at 1.8 GHz are designed and fabricated. The measured results of the two fabricated circuits well agree with the simulated ones, manifest equal power division, high performances in terms of DM response, in-band common-mode (CM) suppression, port-to-port isolation, and expected harmonic suppression.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2018.2871180