Design of filtering power divider with high frequency selectivity

AbstractA compact high-isolation power divider with bandpass response and high-frequency selectivity is presented in this letter. Two dual-mode resonators are used to realize filtering response. The circuit size of the proposed power divider can be reduced by using dual-mode capacitance loaded square meander loop resonators. Due to capacitive load, the resonator can exhibit slow-wave characteristics, which can be utilized to suppress harmonics and reduce size. The simulated and measured results show reasonable agreement.

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Wide-stopband bandpass-filtering power divider with high-frequency selectivity

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078717000836 ◽

2017 ◽

Vol 9 (10) ◽

pp. 1931-1936 ◽

Cited By ~ 3

Author(s):

Kaijun Song ◽

Yifang Zhou ◽

Maoyu Fan ◽

Yu Zhu ◽

Yong Fan

Keyword(s):

Insertion Loss ◽

High Frequency ◽

Return Loss ◽

Signal Transmission ◽

Frequency Selectivity ◽

Power Divider ◽

Center Frequency ◽

Frequency Range ◽

Transmission Zeros ◽

Stopband Attenuation

A wide-stopband bandpass-filtering power divider with high-frequency selectivity has been proposed in this paper. The input and output feeding lines and eight 1/4 wavelength resonators are used to realize the signal transmission. In order to obtain good frequency selectivity, source-load coupling transmission path is used to generate transmission zeros near the passband. A four-way power divider with bandpass-filtering response and high-frequency selectivity is designed, fabricated, and measured. The measured results agree with the simulated ones closely in the desirable frequency range. The measured center frequency of the power divider is 2.38 GHz with input return loss of 31.2 dB, while the measured insertion loss is about 1 dB (not including ideal 6 dB four-way power dividing insertion loss). Moreover, the measured 3-dB bandwidth is 12% and the measured stopband attenuation is >15 dB from 2.59 to 7.7 GHz. In addition, two transmission zeros of 1.9 and 2.8 GHz are located near the passband. The measured output isolations are all >15.7 dB.

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Compact ultra-wideband bandpass-response power divider with high-frequency selectivity

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078718001216 ◽

2018 ◽

Vol 10 (10) ◽

pp. 1107-1112 ◽

Cited By ~ 1

Author(s):

Song Guo ◽

Kaijun Song ◽

Yedi Zhou ◽

Yong Fan

Keyword(s):

High Frequency ◽

Return Loss ◽

Open Circuit ◽

Frequency Selectivity ◽

Ultra Wideband ◽

Power Divider ◽

Transmission Zeros ◽

Equivalent Circuit Method ◽

Impedance Converter ◽

Good Agreement

AbstractThe ultra-wideband bandpass-response power divider with high-frequency selectivity is presented in this paper. This power divider consists of an impedance transformer, a filter network, and two isolation resistors. In order to realize the ultra-wideband filtering performance, parallel coupling lines and parallel open-circuit branches are applied to the second impedance converter. A resistor is added to the ends of the coupling lines to achieve good isolation and output return loss. The equivalent-circuit method is employed to analyze the presented power divider. The power divider, working at 3.45–8.29 GHz, is designed and fabricated. Two transmission zeros are generated at 2.8 and 9 GHz, respectively, and the out-of-band suppression is >13 dB. The measured results are in good agreement with the simulation ones.

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