Ring-balun-bandpass filter with harmonic suppression

Kang, Seong-Jun; Hwang, Hee-Yong

doi:10.1049/iet-map.2009.0295

Cited by 22 publications

(13 citation statements)

References 6 publications

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“…Y T of (1c), then, can be compared to the π‐network by admittance parameters in Figure , to obtain the equivalent parameters of the ring resonator as a bandpass filter in Figure . For example, at the center frequency, putting θ 1 =90°, θ 2 =270° for two transmission lines of the ring resonator, the inter‐stage inverter

J_{12}

is derived as the characteristic admittance difference between two parallel transmission lines

J_{12} = (|||, Y_{1} - Y_{2})

…”

Section: Ring Resonator Bandpass Filtermentioning

confidence: 99%

“…The slope parameter of the ring resonator is obtained from the characteristic admittances of two transmission lines of the ring resonator

b_{1} = \frac{π}{4} (|, Y_{1} + 3 Y_{2})

…”

Section: Ring Resonator Bandpass Filtermentioning

confidence: 99%

“…The dual mode ring resonator has been widely researched and used for variable microwave applications including antennas, mixers, and bandpass filters, because of its low radiation loss, high‐quality factor, and ease of design . The dual‐mode characteristic of ring resonator is easily obtained by perturbing the uniformity, which is etching patterns in ground plane, loading the line with reactive elements, putting impedance discontinuity or combination of these strategies.…”

Section: Introductionmentioning

confidence: 99%

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UWB harmonic‐suppressed miniaturized ring bandpass filter using artificial transmission lines

Sim

Hwang

2017

Micro & Optical Tech Letters

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This letter presents a whole UWB band suppressed ring resonator bandpass filter with small LUCs (Lowpass filter unit cells) [Lee W‐K, Hwang H‐Y. J Electromagn Eng Sci. 2014;14:387–392.] based on artificial transmission lines [Martin F. Artificial Transmission Lines for RF and Microwave Applications. 1st ed. New York: Wiley; 2015]. Two LUCs are used as building blocks for miniaturization and harmonic suppression of the ring resonator of the filter. Design equations for proper characteristic impedances of the ring and for proper stopband transmission zeros of the LUCs are newly presented. Fabricated filter shows insertion loss of 2.3 dB at center frequency of 2.55 GHz, fractional bandwidth of 2.5%, and good harmonic suppression about 20 dB in whole ultra‐wide band, which agreed well with the simulation results. The ring area of the proposed bandpass filter has 36% of that of the conventional one.

show abstract

J_{12}

is derived as the characteristic admittance difference between two parallel transmission lines

J_{12} = (|||, Y_{1} - Y_{2})

…”

Section: Ring Resonator Bandpass Filtermentioning

confidence: 99%

“…The slope parameter of the ring resonator is obtained from the characteristic admittances of two transmission lines of the ring resonator

b_{1} = \frac{π}{4} (|, Y_{1} + 3 Y_{2})

…”

Section: Ring Resonator Bandpass Filtermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

UWB harmonic‐suppressed miniaturized ring bandpass filter using artificial transmission lines

Sim

Hwang

2017

Micro & Optical Tech Letters

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“…Since, the balun has been used for various applications such as amplifiers, antennas, and mixers, the high isolation between output ports and bandpass filtering are the important design issues. Although, the marchand, 1 branch line, 2 dual-mode balun, 3,4 slot-line resonator, 5 and ring resonator 6 had been designed and provided a good passband response, the stopband performance and/or isolation characteristics were limited.…”

Section: Introductionmentioning

confidence: 99%

Wideband bandpass filtering branch‐line balun with high‐isolation

Kim

Jeong

2020

Int J RF Microw Comput Aided Eng

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The wideband bandpass filtering branch-line balun with high isolation is presented in this paper. The proposed balun can be designed for wideband performances by choosing a proper characteristics impedance of input vertical transmission line and odd-mode impedance of parallel-coupled lines. The proposed balun was designed at a center frequency (f 0 ) of 3.5 GHz for validation.The measured results are in good agreement with the simulations. The measured power divisions are −3.31 dB and −3.24 dB at f 0 and −3 ± 0.17 dB within the bandwidth of 0.95 GHz (3 GHz to 3.95 GHz). The input return loss of 24.09is measured at f 0 and higher than 20 dB over the same bandwidth. Moreover, the measured output losses are better than 11 dB within a wide bandwidth.The isolation between output ports is 20.32 dB at f 0 and higher than 13.2 dB for a broad bandwidth from 1 GHz to 10 GHz. The phase difference and magnitude imbalance between two output ports are 180 ± 4.5 and ± 0.95 dB, respectively, for the bandwidth of 0.95 GHz. K E Y W O R D Sbandpass filtering, branch-line balun, coupled line, isolation circuit, wideband

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“…Baluns can take many forms and may include devices that transform impedances. To miniaturize circuits, many researchers have tried integrating a filtering function into balun devices, yielding balun filters [4][5][6][7]. A diplexer is a passive device that implements frequency-domain multiplexing for two different frequencies.…”

Section: Introductionmentioning

confidence: 99%

Using Open Stubs and Tuning the Width of Output Microstrip Lines of a Balun Diplexer to Obtain the Matching Output Impendence With Rf Output Transceiver

Peng¹,

Chen²,

Zhang³

et al. 2017

PIER C

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Abstract-Two novel compact 2.6/5.2 GHz diplexers with high common-mode suppression are designed and fabricated on an FR4 substrate. The diplexers are based on two open-loop rectangle-ring (OLRR) resonators, and two different resonant frequencies are easily obtained by tuning the lengths of the OLRR resonators. In the past, the traditional balun diplexer needed a matching circuit to achieve low loss when transferring a signal to a radio frequency (RF) transceiver, because of unmatched impedances between them. To improve efficiency and lower the cost of circuit fabrication, we propose a novel method for tuning the output impedance of the balun diplexer so that it matches that of the RF transceiver. The resulting balun diplexer has two stub-loaded microstrip lines; the required output impedance can be tuned by changing the widths of the microstrip lines and stubs and adjusting the stubs' length and position. If the output impedance is well tuned, this balun diplexer is more efficient and less costly because a matching circuit is unnecessary.

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Ring-balun-bandpass filter with harmonic suppression

Cited by 22 publications

References 6 publications

UWB harmonic‐suppressed miniaturized ring bandpass filter using artificial transmission lines

UWB harmonic‐suppressed miniaturized ring bandpass filter using artificial transmission lines

Wideband bandpass filtering branch‐line balun with high‐isolation

Using Open Stubs and Tuning the Width of Output Microstrip Lines of a Balun Diplexer to Obtain the Matching Output Impendence With Rf Output Transceiver

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