Novel microstrip coupled-line bandpass filters with shortened coupled sections for stopband extension

Wu, Chao-Huang; Lin, Yo-Shen; Wang, Chi-Hsueh; Chen, Chun Hsiung

doi:10.1109/tmtt.2005.862710

Cited by 12 publications

(1 citation statement)

References 17 publications

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“…The above calculation roughly describes the combline parameters, and further optimization is executed in Ansys HFSS 2021 software.

where n is the filtering order (number of microstrip),

is the lower cutoff frequency of the combline filter,

is the upper cutoff frequency of the combline filter,

is the center frequency of the combline filter,

is the electrical length of the open-ended microstrip stubs,

is the propagation constant,

is the value of the low-pass filter (LPF) prototype element,

is the microstrip capacitance,

is the microstrip coupled capacitance,

is the converter,

is the width of the microstrip and

is the coupling distance between microstrip lines [ 27 , 28 ].…”

Section: Ground Adopts a Combline Filter To Reduce Antenna Element Co...mentioning

confidence: 99%

Mutual Coupling Reduction of a Multiple-Input Multiple-Output Antenna Using an Absorber Wall and a Combline Filter for V2X Communication

Shen

Dou

2023

Sensors

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This paper presents an MIMO antenna for vehicle-to-everything (V2X) communication, which adopts two ways of combline filters and absorption wall decoupling. A combline filter and an absorption wall are used, respectively, for internal and external decoupling. The combline filter is incorporated between the ground of the two adjacent antennas, which reduces the mutual coupling between them. Additionally, the mutual coupling of radiation between adjacent antennas is significantly reduced by the absorber wall. These combline filters and absorber walls use the method of electromagnetic field distribution to explain the reduction in the mutual coupling between the adjacent antennas. The transmission coefficient and surface current distribution explain the effectiveness of the decoupling structure. When the frequency is between 3.8 and 4.8 GHz, the simulation and measurement results show that S11 is less than −10 dB, the bandwidth is 25% and the peak gain is 7.8 dBi. In addition, the proposed MIMO antenna has a high isolation between antenna units (>37 dB), and the envelop correlation coefficient (ECC) is less than 0.005.

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“…The above calculation roughly describes the combline parameters, and further optimization is executed in Ansys HFSS 2021 software.

where n is the filtering order (number of microstrip),

is the lower cutoff frequency of the combline filter,

is the upper cutoff frequency of the combline filter,

is the center frequency of the combline filter,

is the electrical length of the open-ended microstrip stubs,

is the propagation constant,

is the value of the low-pass filter (LPF) prototype element,

is the microstrip capacitance,

is the microstrip coupled capacitance,

is the converter,

is the width of the microstrip and

is the coupling distance between microstrip lines [ 27 , 28 ].…”

Section: Ground Adopts a Combline Filter To Reduce Antenna Element Co...mentioning

confidence: 99%

Mutual Coupling Reduction of a Multiple-Input Multiple-Output Antenna Using an Absorber Wall and a Combline Filter for V2X Communication

Shen

Dou

2023

Sensors

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Miniaturized impedance inverter 2.4 GHz filter with optimal transmission zeroes

Meiguni

Mazdarani

2018

Micro & Optical Tech Letters

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A compact bandpass microstrip filter with high selectivity capability is fully investigated in this article. The basic characteristics, circuit models, and design formulas are explained completely. This technique provides more freedoms for putting the transmission zeroes with negative coupling structures in appropriate frequencies and leads to highly selective, low profile and compact filters. To validate the procedure, 3 design examples based on impedance inverter (K), admittance inverter (J) and λ/4 resonators are presented. All of the filters operate at 2.4 GHz with the fractional bandwidth more than 10% but different values in source–resonator–load couplings. The latter is obtained by tilting the middle J‐inverter toward the main line. For tilt‐angle equal to 90°, more than 50 dB null‐depth has been achieved in filters stop‐band near 8% of passband edges showing the appropriate figure of merit for this symmetrical filter. Simulated results performed by CST Microwave Studio and measured results are in good agreement with the theoretical peers.

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Design of a modified hairpin bandpass filter using embedded radial stubs featuring ultrawide stopband

Sharifi

Mashayekhi

2023

AEU - International Journal of Electronics and Communications

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Novel microstrip coupled-line bandpass filters with shortened coupled sections for stopband extension

Cited by 12 publications

References 17 publications

Mutual Coupling Reduction of a Multiple-Input Multiple-Output Antenna Using an Absorber Wall and a Combline Filter for V2X Communication

Mutual Coupling Reduction of a Multiple-Input Multiple-Output Antenna Using an Absorber Wall and a Combline Filter for V2X Communication

Miniaturized impedance inverter 2.4 GHz filter with optimal transmission zeroes

Design of a modified hairpin bandpass filter using embedded radial stubs featuring ultrawide stopband

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