Compact wideband bandpass filter based on coupled line stub with high selectivity

La, Dong‐Sheng; Guan, Xin; Wang, Mengyuan; Mi, Rong-Qi

doi:10.1016/j.aeue.2021.153872

Cited by 10 publications

(7 citation statements)

References 16 publications

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“…Coupled lines play an important role to obtain a bandpass frequency response. 8 When we assemble them in a spiral, they occupy less space. Microstrip solid wide cells are also useful to control the passband due to their capacitive characteristics.…”

Section: Design Of the Proposed Resonator And Filtersmentioning

confidence: 99%

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A high‐performance microstrip bandpass filtering coupler with low‐loss and compact size

Rezaei

Yahya

Noori

2023

Micro & Optical Tech Letters

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In this letter, novel spiral‐coupled transmission lines are used to obtain a high‐performance microstrip coupler. The advantages of the proposed microstrip coupler are novel structure, filtering frequency response, suppressed harmonics up to second harmonics, transmission poles, low losses, compact size, and good phase balance. The proposed structure is novel and different from the previous coupler designs such as rate‐races, rings, and branch‐lines types. It is presented for the first time in this work with a very small size and good performance. The size of this coupler is only 82.6 mm2 (0.004 λg2). The common port return loss is 33 dB and the insertion losses at port 2 and port 3 are 2.2 and 2.7 dB, respectively. To prove the accuracy of the design method and simulation results, the proposed coupler is fabricated and measured where the measurement results confirm the simulation results and the proposed design method.

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Section: Design Of the Proposed Resonator And Filtersmentioning

confidence: 99%

“…Coupled lines play an important role to obtain a bandpass frequency response 8 . When we assemble them in a spiral, they occupy less space.…”

Section: Design Of the Proposed Resonator And Filtersmentioning

confidence: 99%

A high‐performance microstrip bandpass filtering coupler with low‐loss and compact size

Rezaei

Yahya

Noori

2023

Micro & Optical Tech Letters

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“…Bandpass filters are mainly transmission line-based passive devices that are used in many RF/microwave circuits and wireless communication and radar systems. They are essential front-end components that can pass signals within a certain frequency range and reject unwanted out-of-band signals [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. There are many parameters to be considered in the design and implementation of a bandpass filter, such as the design structure, size, passband frequency bandwidth, insertion loss, selectivity, roll-off rate, isolation, and stopband rejection.…”

Section: Introductionmentioning

confidence: 99%

“…This type of filter is excellent for multiple frequency systems such as carrier aggregation or wireless local area network (WLAN) bands. Another method for obtaining a wideband response is by modifying the filter structure or attaching other elements to increase the bandwidth—such a method works well for wideband applications [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Dual-Band and Wideband Bandpass Filters Using Coupled Lines and Tri-Stepped Impedance Stubs

Alazemi

2023

Micromachines

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In this paper, two bandpass filters—one with a dual-band response and the other with a wideband response—were designed, implemented, and experimented with. The filters are based on the novel combination of series coupled lines and tri-stepped impedance stubs. However, coupled lines along with tri-stepped impedance open stubs (TSIOSs) give a third-order dual passband response. The advantage of dual-band filters using coupled lines and TSIOSs is that they have wide passbands that are close together and separated by a single transmission zero. In contrast, the inclusion of tri-stepped impedance short-circuited stubs (TSISSs) instead of TSIOSs provides a fifth-order wide passband response. The advantage of wideband bandpass filters using coupled lines and TSISSs is that they have a very good selectivity factor. Theoretical analysis was carried out to validate both filter configurations. The tested bandpass filter using coupled lines and TSIOS units had two close wide passbands operating at 0.92 and 1.52 GHz center frequencies, respectively. The dual-band bandpass filter was implemented to operate in GSM and GPS applications. The first passband had a 3 dB fractional bandwidth (FBW) of 38.04%, while the second passband had a 3 dB FBW of 22.36%. The experimental result of the wideband bandpass filter (with coupled lines and TSISS units) had a center frequency of 1.51 GHz with a 3 dB fractional bandwidth of 62.91% and a selectivity factor of 0.90. A good congruence was demonstrated between the full-wave simulated and tested results for both filters.

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“…The design of filters depicted in [12][13][14][15][16][17][18] involves complex methods which require sophisticated procedures for achieving the narrow spacing between adjacent lines. For improving the selectivity of the structure, various methods are discussed in [19][20][21][22][23][24][25]. Techniques for improving the stopband suppression are analyzed in [26,27].…”

Section: Introductionmentioning

confidence: 99%

Staired-Slitted Flag Central Resonator Based Wide Band Bandpass Filter for Super Spurious Harmonic Suppressions

Iqubal¹,

Abdulla²

2021

PIER C

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A novel staired-slitted flag central resonator based wide band bandpass filter with sharp selectivity and super spurious harmonic suppression is proposed in this paper. Input-output ports based on three line edge coupling with ground plane aperture cutting contribute to the rejection of harmonics in the lower stopband. The spurious harmonic at the upper stopband is rejected with the help of embedded open stub suppression cells. The generation of two transmission zeros at the lower and upper cut-off frequencies are due to the staired slitted-flag main resonator, which contributes to the better selectivity of the filter, and it is verified with the help of mathematical equations. The fractional bandwidth of the developed filter is 107.2% with 7.82 GHz centre frequency. This work demonstrates the design, theory, and implementation aspects for the realization of bandpass filters with sharp selectivity and very good spurious suppression.

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Compact wideband bandpass filter based on coupled line stub with high selectivity

Cited by 10 publications

References 16 publications

A high‐performance microstrip bandpass filtering coupler with low‐loss and compact size

A high‐performance microstrip bandpass filtering coupler with low‐loss and compact size

Dual-Band and Wideband Bandpass Filters Using Coupled Lines and Tri-Stepped Impedance Stubs

Staired-Slitted Flag Central Resonator Based Wide Band Bandpass Filter for Super Spurious Harmonic Suppressions

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