• Title, Summary, Keyword: Balun

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The Design of Balun-BPF with Double Ring-Resonators (두 개의 링-공진기로 구성된 Balun-BPF의 설계)

  • Kang, Seong-Jun;Hwang, Hee-Yong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.8
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    • pp.878-883
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    • 2008
  • In this paper, we propose a double rings structure to improve the balanced-port characteristics of Balun-Bandpass Filter(Balun-BPF). The conventional Balun-BPF has limitations on output symmetry and skirt steepness. We introduce a double rings structure and the suitable coupling point between the two ring resonators to solve these problems. The fabricated double rings Balun-BPF shows excellent characteristics as a Balun-BPF without the conventional limitations.

A Study on the Tapered Balun for the UWB UHF Coupler

  • Park, Jae-Gu;Yi, Sang-Hwa;Kim, Kwang-Hwa;Rhee, Young-Chul
    • KIEE International Transactions on Electrophysics and Applications
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    • v.3C no.6
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    • pp.236-240
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    • 2003
  • The UWB UHF coupler for GIS PD detection requires a balun (balance to unbalance transformer) to show its inherent UWB characteristics. In order to reduce the size of the balun and to make it practical in the conventional GIS, a novel tapered coaxial balun with a dielectric was proposed for the UWB UHF coupler. The performance of the proposed balun was verified through a series of simulations, measurements and experiments. As a result, both the conventional balun and the proposed balun, which has a length equal to one third of that of the conventional balun, demonstrated good S11 characteristics, whereas the efficiency of the proposed balun increased as much as about 30% in comparison to the conventional one.

An Analysis of Three Port Ring Resonator for the Balun-BPF Characteristics (Balun-BPF 특성 구현을 위한 3-단자 링-공진기의 해석)

  • Kang, Seong-Jun;Park, Ung-Hee;Hwang, Hee-Yong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.4
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    • pp.436-441
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    • 2008
  • In this paper, we derived the Y-parameter of the recently reported Balun-BPF with a dual mode ring resonator by using the network analysis method. Using the derived Y-parameter we verified that the Balun-BPF structure satisfy the balun conditions. In order to design the Balun-BPF with arbitrary characteristics using the standard BPF design method with ease we derived the immittance slope parameters of the dual mode ring resonator with a load. The notch frequencies are also predicted. By designing with the proposed equations, simulating with a circuit simulator, fabricated and measured a Balun-BPF we confirmed the validation of the equations. The measured data shows bandwidth of 71 MHz and insertion loss of 0.92 dB at the center frequency of 2.46 GHz. It shows the phase imbalance of $174{\sim}181$ degree and the magnitude imbalance within 0.5 dB.

Design of a 2.4-GHz Fully Differential Zero-IF CMOS Receiver Employing a Novel Hybrid Balun for Wireless Sensor Network

  • Chang, Shin-Il;Park, Ju-Bong;Won, Kwang-Ho;Shin, Hyun-Chol
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.8 no.2
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    • pp.143-149
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    • 2008
  • A novel compact model for a five-port transformer balun is proposed for the efficient circuit design of hybrid balun. Compared to the conventional model, the proposed model provides much faster computation time and more reasonable values for the extracted parameters. The hybrid balun, realized in $0.18\;{\mu}m$ CMOS, achieves 2.8 dB higher gain and 1.9 dB lower noise figure than its passive counterpart only at a current consumption of 0.67 mA from 1.2 V supply. By employing the hybrid balun, a differential zero-IF receiver is designed in $0.18\;{\mu}m$ CMOS for IEEE 802.15.4 ZigBee applications. It is composed of a differential cascode LNA, passive mixers, and active RC filters. Comparative investigations on the three receiver designs, each employing the hybrid balun, a simple transformer balun, and an ideal balun, clearly demonstrate the advantages of the hybrid balun in fully differential CMOS RF receivers. The simulated results of the receiver with the hybrid balun show 33 dB of conversion gain, 4.2 dB of noise figure with 20 kHz of 1/f noise corner frequency, and -17.5 dBm of IIP3 at a current consumption of 5 mA from 1.8 V supply.

0.6~2.0 GHz Wideband Active Balun Using Advanced Phase Correction Architecture (진화된 위상보정 구조를 갖는 0.6~2.0 GHz 광대역 Active Balun 설계)

  • Park, Ji An;Jin, Ho Jeong;Cho, Choon Sik
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.25 no.3
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    • pp.289-295
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    • 2014
  • In this paper a wideband active balun using advanced phase correction architecture is proposed. The proposed active balun is constructed with each different architecture of active balun combined with the cascode architecture to improve phase correction performance compared with conventional phase correction techniques. Operating over 0.6~2.0 GHz band, the proposed balun shows $10^{\circ}$ of phase error and 2 dB of gain error with 7 mW power consumption from 1.8 V supply voltage.

Wideband and Compact Balun with Circular Slot and Stacked Structure (원형 슬롯과 유전체 적층 구조를 적용한 광대역 소형 발룬)

  • Cha, Seung Gook;Park, Chan Ju;Kim, Hyungrak;Yoon, Young Joong
    • Journal of Satellite, Information and Communications
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    • v.12 no.1
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    • pp.132-136
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    • 2017
  • In this paper, expanded lowest operating frequency by adopting circular slot on ground of balun and balance improved balance performances by stacking dielectric layer balun is proposed. Bandwidth of proposed balun is 1~7 GHz, and electrical length is $0.05{\lambda}$ at 1 GHz. In order to check performances of the proposed balun, simple dipole is integrated with the balun and radiation pattern of dipole is measured.

Miniaturization of Dual Ring Balun-BPF (두 개의 링-공진기를 갖는 Balun-BPF의 소형화)

  • Kang, Seong-Jun;Hwang, Hee-Yong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.2
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    • pp.129-134
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    • 2009
  • In this paper, we proposed a miniaturized Balun-BPF structure using semi-lumped line The conventional Ring Balun-BPF relatively has a big size structure because they consist of two ring resonators, wide line width ring-resonators for low loss and $\lambda/4$transmission line inverters. The ring resonators are miniaturized to 1/4 size by semi-lumped line and we added triangle patches in the ring resonator for compact Balun-BPF structure. The fabricated Balun-BPF is miniaturized to 1/4 size and contains symmetrical output characteristics of balance ports.

Tapered Balun of a UWB UHF coupler for GIS PD detection (GIS PD 검출용 UWB UHF 커플러의 테이퍼형 발룬)

  • Choi, J.G.;Yi, S.H.;Kim, K.H.
    • Proceedings of the KIEE Conference
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    • pp.29-32
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    • 2003
  • The UWB UHF coupler for GIS PD detection needs a balun(balance to unbalance transformer) to show its inherent UWB characteristics. In order to reduce the size of the balun and to make it practical in the conventional GIS, a novel tapered coaxial balun with a dielectric was proposed for the UWB UEIF coupler. The performance of the proposed balun was verified through a series of simulations, measurement and experiments. As results, both the conventional balun and the proposed balun of which length is one third of that of the conventional one showed good S11 characteristics, whereas the efficiency of the proposed balun increased as much as about 30% in comparison with the conventional one.

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The phase characteristic analysis of BALUN using a coaxial cable (동축 선로를 이용한 BALUN의 위상 특성 분석)

  • Park, Ung-hee
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.238-240
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    • 2017
  • Balun using a coaxial lines i often used in microwave circuits due to easy fabrication, high operating power, and stable operation. However, it is difficult to predict an accurate balun operation characteristic due to the parasitic reactance component to be generated when the coaxial line is connected to the microstrip line existing on the substrate, and the inductance and the capacitance component of the coaxial line itself. In this paper, it is measured the phase characteristics at two output ports of the coaxial line balun which should have opposite phase characteristics. Based on these results, it will examine closely the feasibility of making more improved coaxial line balun.

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Tapered Balun of a UWB UHF coupler for GIS PD detection (GIS PD 검출용 UWB UHF 커플러의 테이퍼형 발룬)

  • Yi, S.H.;Choi, J.G.;Kim, K.H.
    • Proceedings of the KIEE Conference
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    • pp.117-120
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    • 2004
  • The UWB UHF coupler for GIS PD detection needs a balun (balance to unbalance transformer) to show its inherent UWB characteristics. In order to reduce the size of the balun and to make it practical in the conventional GIS, a novel tapered coaxial balun with a dielectric was proposed for the UWB UHF coupler. The performance of the proposed balun was verified through a series of simulations, measurement and experiments. As results, both the conventional balun and the proposed balun of which length is one third of that of the conventional one showed good S11 characteristics, whereas the efficiency of the proposed balun increased as much as about 30% in comparison with the conventional one.

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