FR-4 Embedded Wideband Micro-Balun with Coupled LC Resonators

Park, Jong-Cheol; Park, Jae Yeong

doi:10.1109/eumc.2008.4751456

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…2 (a) [7]. This balun was consisted of two pairs of magnetically coupled resonators, which shared one resonator with the other and had bandpass transmission characteristic.…”

Section: Design and Simulationmentioning

confidence: 99%

PCB embedded compact balanced filter with coupled LC resonators

Park

Yoon

2009

2009 59th Electronic Components and Technology Conference

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In this paper, PCB embedded compact unbalanced-tobalanced filter was newly proposed for low cost Bluetooth and wireless LAN applications. In order to obtain excellent bandpass transmission characteristic, the proposed filter was configured by using two pair of modified magnetically coupled LC resonator. This proposed structure provides transmission zero pole at upper frequency regime. Out-ofband suppression under the passband was enhanced by applying parallel connected LC resonator at single-ended port. In order to reduce the size of PCB embedded balanced filter, BaSrTiO3 (BST) composite high Dk RCC film was applied to improve the capacitance density. This high Dk film provided the capacitance density of 12.2 pF/mm 2 . The fabricated filter had insertion loss and minimum return loss of 2.2dB and 11dB in the frequency ranged from 2.4~2.5GHz, respectively. The maximum magnitude and phase imbalance were 0.9dB and 1.5 degree in its passband, respectively. The out-of-band suppression was observed approximately 30dB and 22dB below 1.9GHz and over 3.5GHz, respectively. It has a compact volume of 1.7 mm × 2 mm × 0.7 mm (height). IntroductionRecent wireless communication systems, such as wireless LAN, Bluetooth, WiMAX and etc, have been adopting the balanced circuits due to the higher resistances on common mode noise and interference than conventional single-ended lines. Most of RF front-end passive components and circuits, such as antennas, duplexers, switches, and filters, still have single-ended inputs and outputs. Thus, a compact balun with high performance has become the most necessary component as an interface between a single-ended and a balanced device [1-6]. Fig. 1 shows a block diagram of RF FEM (front end module) which includes balanced circuit configuration.Recently, several single-ended to balanced bandpass filters have been developed by using LTCC technology. In order to obtain good bandpass transmission characteristic, cascade configuration was presented by connecting the filter in series with the conventional balun [1][2]. After that, coupled line structure implemented into LTCC substrate was introduced to combine the function of balun and bandpass filter [3]. Although it showed that the coupled resonators were powerful devices for designing the balanced filters, it occupied a large area because it was made with half or quarter-wavelength coupled-line. To address the size issue, lumped-type the balanced filter was developed by using two or three ordered

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“…2 (a) [7]. This balun was consisted of two pairs of magnetically coupled resonators, which shared one resonator with the other and had bandpass transmission characteristic.…”

Section: Design and Simulationmentioning

confidence: 99%

PCB embedded compact balanced filter with coupled LC resonators

Park

Yoon

2009

2009 59th Electronic Components and Technology Conference

View full text Add to dashboard Cite

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“…Furthermore, they do not provide DC isolation characteristics between the unbalanced and balanced ports from the driving power of the RF integrated circuits. In order to reduce the number of lumped elements and enhance the performance of the balun, a coupling method was applied [19]. The micro balun transformer reported here was designed with coupled LC resonators and embedded into a multi-layered PCB (printed circuit board) with a high dielectric BrTiO 3 composite film.…”

Section: Introductionmentioning

confidence: 99%

Semi-lumped Balun Transformer using Coupled LC Resonators

Park¹,

Yoon²,

Park³

2015

Journal of Electrical Engineering and Technology

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-This paper presents a semi-lumped balun transformer using conventional PCB process and its design theory and geometry for the maximally flat response and wide bandwidth using magnetically coupled LC resonators. The proposed balun is comprised of two pairs of coupled resonators which share one among three LC resonators. It provides an identical magnitude and phase difference of 180° between two balanced ports with DC isolation and an impedance transformation characteristic. Theoretical design and analysis were performed to optimize the inductance and capacitance values of proposed balun device for obtaining the wide bandwidth and maximally flat response in its pass-band. Three balun transformers with a center frequency of 500 MHz were demonstrated for proving the concept of design proposed. They were fabricated by using lumped chip capacitors and planar inductors embedded into a conventional 4-layered PCB substrate. They exhibited a maximum magnitude difference of 0.8 dB and phase difference within 2.4 degrees.

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Miniaturized UHF tunable filter using PCB embedding passive technology

Chang

Park

2010

Micro & Optical Tech Letters

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In this article, PCB embedded UHF tunable filters with different coupling coefficients have been designed, fabricated, characterized, and compared.The relationship between the coupling coefficient and the performance of a filter has been investigated. The proposed filters were fully embedded into multilayered printed circuit board (PCB). They were comprised of high Q spiral stacked inductors, high dielectric SrTiO3 composite MIM capacitors, and varactor diodes. The fabricated UHF tunable filters were operated in the frequency regime ranged from 500 MHz to 900 MHz for TV tuner receivers. The filter with a coupling coefficient of 0.26 exhibited insertion loss of approximately −2 dB, return loss of below −10 dB, and tuning range of 56.3%. In our knowledge, the fabricated UHF tunable filter was first embedded into the organic packaging substrate and the smallest one in the previously reported devices, which had compact size/volume of 3.4 × 4.4 × 0.6 mm3. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1768–1771, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25306

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FR-4 Embedded Wideband Micro-Balun with Coupled LC Resonators

Cited by 4 publications

References 12 publications

PCB embedded compact balanced filter with coupled LC resonators

PCB embedded compact balanced filter with coupled LC resonators

Semi-lumped Balun Transformer using Coupled LC Resonators

Miniaturized UHF tunable filter using PCB embedding passive technology

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