New Ultra-Wide Stopband Low-Pass Filter Using Transformed Radial Stubs

Ma, Kaixue; Yeo, Kiat Seng

doi:10.1109/tmtt.2010.2095031

Cited by 125 publications

(100 citation statements)

References 18 publications

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“…By considering the open-end radial stubs as a unit, which is shown in Figure 6; the capacitance of the radial stub can be obtained through one port -parameter using (1) and (2) [7].…”

Section: B the Lc Model Of The Proposed P-shaped Resonatormentioning

confidence: 99%

See 1 more Smart Citation

Compact Microstrip Low-pass Filter with Wide Stop-band Using P-Shaped Resonator

Hayati

Validi

Shama³

et al. 2016

J. Microw. Optoelectron. Electromagn. Appl.

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“…By considering the open-end radial stubs as a unit, which is shown in Figure 6; the capacitance of the radial stub can be obtained through one port -parameter using (1) and (2) [7].…”

Section: B the Lc Model Of The Proposed P-shaped Resonatormentioning

confidence: 99%

“…where Zin can be calculated as: For the straight stub, the equivalent capacitance can be directly obtained as (3) when the effective electrical length is less than a quarter-wave length [7]:…”

Section: B the Lc Model Of The Proposed P-shaped Resonatormentioning

confidence: 99%

Compact Microstrip Low-pass Filter with Wide Stop-band Using P-Shaped Resonator

Hayati

Validi

Shama³

et al. 2016

J. Microw. Optoelectron. Electromagn. Appl.

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“…The dimensions and LC equivalent circuits of the proposed resonator are depicted in Figs. 1(a) and (b) [11] respectively. The high impedance lines act as series inductors and the low impedance lines act as shunt capacitors [12].…”

Section: Resonator Designmentioning

confidence: 99%

Compact Microstrip Lowpass Filter With Sharp Roll-Off and Wide Stopband Using Semicircle Ended Stub Resonator

Hayati¹,

Memari²,

Abbasi³

2012

PIER Letters

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Abstract-In this paper, a semicircle ended stub resonator, cascaded to a modified radial patch to design a compact lowpass filter with sharp roll-off and wide stopband is proposed. This filter has 3 dB cutoff frequency at 1.54 GHz. The transition band is only 0.26 GHz from 1.54 GHz to 1.8 GHz with corresponding attenuation levels of −3 dB and −20 dB respectively. Maximum insertion loss is 0.1 dB in the passband, and the stopband bandwidth with the attenuation level better than −20 dB is extended from 1.8 GHz up to 13.93 GHz. So, a wide stopband is achieved. The proposed filter is designed, fabricated and measured, where there is a good agreement between the simulation and measurement results. The results show that a roll-off rate of 65.4 dB/GHz together with a relative stopband bandwidth of 154% with the suppression level of −20 dB is obtained while achieving a high figure of merit (FOM) of 23509.

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“…Lowpass filters (LPFs) are one of the most important components in modern microwave communication system. Many efforts have been explored to improve its performance, such as high rejection level, wide stopband and minimum size [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Compact LPF With Sharp Roll Off and Wide Stopband Using Coupling Stepped Impedance Triangular Resonator

Du¹,

Yang²,

Zhang³

et al. 2014

PIER Letters

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Abstract-A lowpass filter with sharp transition and wide stopband using a novel coupling steppedimpedance triangular resonator is presented. The L-C equivalent circuit is developed for designing this type filter and analyzing the mechanism for improving roll-off and rejection property. The stopband width, passband edge, roll-off rate and overall suppression level are affected by coupling capacitance. The effect of coupling capacitance is analyzed using calculated frequency response. Coupling triangular stubs provide adequate coupling capacitance resulting in balance among transition property, stopband width and suppression level easily. A single LPF unit is designed and fabricated with cutoff frequency of 860 MHz. The single LPF unit exhibits 40-dB suppression level from 1.11 GHz to 2.28 GHz. A cascaded LPF with three asymmetric units provides 40-dB suppression level from 1.1 GHz to 6.76 GHz, and rolloff rate of 154 dB/GHz with compact size as small as 0.23λ g × 0.05λ g , where λ g is guided wavelength at cutoff frequency.

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New Ultra-Wide Stopband Low-Pass Filter Using Transformed Radial Stubs

Cited by 125 publications

References 18 publications

Compact Microstrip Low-pass Filter with Wide Stop-band Using P-Shaped Resonator

Compact Microstrip Low-pass Filter with Wide Stop-band Using P-Shaped Resonator

Compact Microstrip Lowpass Filter With Sharp Roll-Off and Wide Stopband Using Semicircle Ended Stub Resonator

Compact LPF With Sharp Roll Off and Wide Stopband Using Coupling Stepped Impedance Triangular Resonator

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