• Title, Summary, Keyword: external isolation resistors

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Novel Filtering Power Divider with External Isolation Resistors

  • Lu, Yun-Long;Wang, Shun;Dai, Gao-Le;Li, Kai
    • ETRI Journal
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    • v.37 no.1
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    • pp.61-65
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    • 2015
  • In this paper, a novel filtering power divider with external isolation resistors is presented. The proposed power divider can be considered as an integration of a bandpass filter and a Gysel power divider. Based on the circuit topology, a high-order filtering power divider can be easily realized. Odd- and even-mode models are employed to analyze the filtering and power splitting functions. For demonstration, a third-order filtering power divider operating at 1.5 GHz is designed and implemented. The measured results exhibit an isolation between the output ports that is better than 20 dB at around the center frequency.

A Novel Unequal Broadband Out-of-Phase Power Divider Using DSPSLs

  • Lu, Yun Long;Dai, Gao-Le;Li, Kai
    • ETRI Journal
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    • v.36 no.1
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    • pp.116-123
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    • 2014
  • In this paper, a novel unequal broadband out-of-phase power divider (PD) is presented. Double-sided parallel-strip lines (DSPSLs) are employed to achieve an out-of-phase response. Also, an asymmetric dual-band matching structure with two external isolation resistors is utilized to obtain arbitrary unequal power division, in which the resistors are directly grounded for heat sinking. A through ground via (TGV), connecting the top and bottom sides of the DSPSLs, is used to short the isolation components. Additionally, this property can efficiently improve the broadband matching and isolation bandwidths. To investigate the proposed divider in detail, a set of design equations are derived based on the circuit theory and transmission line theory. The theoretical analysis shows that broadband responses can be obtained as proper frequency ratios are adopted. To verify the proposed concept, a sample divider with a power division of 2:1 is demonstrated. The measured results exhibit a broad bandwidth from 1.19 GHz to 2.19 GHz (59.2%) with a return loss better than 10 dB and port isolation of 18 dB.

Unequal Gysel Power Divider Using External One Resistor (한 개의 저항을 사용한 비균등 Gysel 전력 분배기)

  • Yoon, Young-Chul;Sim, Seok-Hyun;Kim, Young
    • The Journal of Advanced Navigation Technology
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    • v.19 no.3
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    • pp.224-229
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    • 2015
  • In this paper, we derived the design equation and implemented the unequal Gysel power divider that is one external resistors using the ABCD parameters analysis. Conventional unequal Gysel divider is difficult to obtain the characteristics of isolation and return loss at between output ports because it can't select a theoretical value of external resistor. To solve those problems, we design the new unequal Gysel power divider with transmission lines and one external resistor that has the characteristics of conventional unequal Gysel divider. To validate this design method, we simulated and measured an 4: 1 unequal Gysel power divider at the center frequency 1 GHz. The measured performances agreed well with the simulation results.