Ultra-Wideband Bandpass Filters Using Quarter-Wave Short-Circuited Shunt Stubs and Quarter-Wave Series Transformers

Uhm, Manseok; Kim, Ki-Chul; Filipović, Dejan S.

doi:10.1109/lmwc.2008.2003455

Cited by 34 publications

(18 citation statements)

References 10 publications

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“…Various techniques have been proposed to make broadband filters for UWB technology. Transmission lines utilizing open and short stubs leading to a cascade of low and high pass filters are the classical methods reported in [1]- [3]. Unfortunately, they are large and the requirement of an additional stopband filter in those designs increases the insertion loss.…”

Section: Introductionmentioning

confidence: 99%

Ultra compact filters for ultra-wideband (UWB) applications using multilayer ring resonators

Hashemi

Mirshekar‐Syahkal

2009

2009 IEEE International Conference on Ultra-Wideband

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Novel compact ultra-wideband (UWB) bandpass filters are proposed. It is based on multilayer ring resonators (MRR). The ring is applied to any loop shape. The filter has a simple structure for fabrication and the design technique can be adapted in order to realize both narrowband and ultra-wideband filters. With the MRR, filters of bandwidths in excess of 10 GHz while enjoying a wide stop-band can be designed. The fractional bandwidth of more than 143% and a group delay of less than 0.2ns are achieved with this class of filters. Also, in this class of filters, it is easy to place the attenuation poles in order to fit a requirement. Due to its small circuit size (around 2 mm in each dimension), this filter can be used in hybrid integration with small UWB, WLAN and radar devices. Since the filter is located within two ground planes, no radiation affects its characteristics. Two types of the proposed UWB filters were fabricated and the measurement verified the theory and simulation.

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Section: Introductionmentioning

confidence: 99%

Ultra compact filters for ultra-wideband (UWB) applications using multilayer ring resonators

Hashemi

Mirshekar‐Syahkal

2009

2009 IEEE International Conference on Ultra-Wideband

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“…11(b). Compared to other published results [11]～ [14], the proposed UWB filter shows a very low spurious response, while the other characteristics are almost the same as in Table 1.…”

Section: -2 Asymmetrical Stepped-impedance Low-pass Typementioning

confidence: 47%

“…The number of poles increases when the impedance value of Z0,1 is lower than 50 Ω. Therefore, the return loss characteristic is improved by using the lower impedance at the position of Z0,1 [11].…”

Section: -2 Asymmetrical Stepped-impedance Low-pass Typementioning

confidence: 99%

Design of Low-Pass Type Inverter: UWB Band-Pass Filter with Low Spurious Characteristics

Cho¹,

Choi²,

Yun³

2011

Journal of electromagnetic engineering and science

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In this paper, we present the design method for a low-pass type inverter, which can effectively suppress the spurious response associated with band-pass filters. The inverter has a length of λ/4 and employs not only a stepped-impedance configuration but also asymmetrical and bending structures in order to improve frequency selectivity and compactness. The inverter is applied as an impedance/admittance inverter to the ultra-wideband (UWB) band-pass filter. The UWB band-pass filter configuration is based on a stub band-pass filter consisting of quarter-wavelength impedance inverters and shunt short-circuited stubs λ/4 in length. The asymmetrical stepped-impedance low-pass type inverter improves not only the spurious responses, but also the return loss characteristics associated with a UWB band-pass filter, while a compact size is maintained. The UWB band-pass filter using the proposed inverters is fabricated and tested. The measured results show excellent attenuation characteristics at out-band frequencies, which exceed 18 dB up to 39 GHz. The insertion loss within the pass-band (from 3.1 to 10.6 GHz) is below 1.7 dB, the return loss is below 10 dB, and the group delay is below 1 ns.

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“…Although bias-tee networks can include several shunt shorted stubs for DC current injection [10], bias tees that contain one shunt shorted stub are preferred because shorted stubs are not easy to implement over wide frequency ranges. This section describes distributed band-pass and highpass circuits synthesized with five zero-reflection points to find a structure suitable for ultra-wideband bias tees.…”

Section: Network Synthesis For a Desired Bias Teementioning

confidence: 99%

Ultra-wideband bias-tee design using distributed network synthesis

Kim

2013

IEICE Electron. Express

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This paper presents a design methodology for ultrawideband bias tees, using a distributed network synthesis considering both RF and DC performance. For the design of bias tees, transfer functions of distributed circuits are offered using equal ripple approximation, and DC current-handling capacity is incorporated into the network synthesis by calculating capacity in terms of the characteristic impedance of a transmission line. A bias-tee circuit with the desired characteristics can be synthesized by properly adjusting the minimum insertion loss (MIL) and ripple of the transfer function with reference to the required performance. As an example, a distributed network synthesis is applied to design a bias tee for ultra-wideband applications.

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Ultra-Wideband Bandpass Filters Using Quarter-Wave Short-Circuited Shunt Stubs and Quarter-Wave Series Transformers

Cited by 34 publications

References 10 publications

Ultra compact filters for ultra-wideband (UWB) applications using multilayer ring resonators

Ultra compact filters for ultra-wideband (UWB) applications using multilayer ring resonators

Design of Low-Pass Type Inverter: UWB Band-Pass Filter with Low Spurious Characteristics

Ultra-wideband bias-tee design using distributed network synthesis

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