Dual-Mode Dual-Band Bandpass Filter With Asymmetrical Transmission Zeros

Wattikornsirikul, Natchayathorn

doi:10.2528/pierm19090101

Cited by 7 publications

(5 citation statements)

References 3 publications

(5 reference statements)

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“…In the construction of filters, microstrip trans mission lines with loaded stubs also produce TZs at certain frequencies. For instance, multi-mode stub-loaded resonator was proposed in [23], and a dual-band BPF with th dual-mode operation was built in [24] employing stubs-loaded UIRs. Moreover, two In addition to miniaturization and low insertion loss, a good passband with sharpened rejection skirts is also necessary for effective filter design.…”

Section: Introductionmentioning

confidence: 99%

“…In the construction of filters, microstrip transmission lines with loaded stubs also produce TZs at certain frequencies. For instance, a multi-mode stub-loaded resonator was proposed in [23], and a dual-band BPF with the dual-mode operation was built in [24] employing stubs-loaded UIRs. Moreover, two single-band filters with common input and output coupled-feed lines can be combined to create dual-band filters [25,26], although these filters can be challenging to debug and take up a lot of circuit space.…”

Section: Introductionmentioning

confidence: 99%

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Design and Modelling of a Compact Triband Passband Filter for GPS, WiMAX, and Satellite Applications with Multiple Transmission Zero’s

et al. 2023

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Designing microwave filters with high selectivity and sharp roll-off between the stop and pass bands can be challenging due to the complex nature of the R.F. signals and the requirements for achieving high performance in a limited physical space. To achieve a high selectivity and sharp roll-off rate, this paper presents a compact filter with a triple passband response. The two different passbands at 1.57 GHz and 3.5 GHz are achieved using a step impedance resonator (SIR) with metallic slots perturbation added to the lower corner of the high impedance section of the SIRs, which helps to enhance the filter’s selectivity and size reduction greatly. The embedded L-shaped structure originates a third passband at 4.23 GHz, resulting in a triband response with eight transmission zeros below and above the passbands at 1.22/1.42/1.98/3.18/3.82/3.98/4.38/4.53 GHz, respectively. The prototype has low signal attenuation of <1.2 dB and high signal reflection of >25 dB for the three passbands. The fractional bandwidths achieved are 2.54%, 4.2%, and 1.65% at 1.57/3.57/4.23 GHz, respectively, with rejection levels in the stopband greater than 15 dB. Lastly, the structure is fabricated on RO-4350B PCB and observed good matching between experimental and measured results. This demonstrates that the prototype can be successfully implemented in real-world applications such as GPS, WiMAX, and Satellite systems. The area occupied by the filter on a substrate or in a circuit is 0.31 λg × 0.24 λg, where λg is the guided wavelength of the material calculated at the lowest frequency.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and Modelling of a Compact Triband Passband Filter for GPS, WiMAX, and Satellite Applications with Multiple Transmission Zero’s

et al. 2023

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“…In addition, microstrip transmission lines with stubs loaded can also generate TZs at some specified frequencies, so they are often used to design filters. A simple dualmode dual-band BPF with asymmetrical TZs was presented in [13], which applied stubs-loaded UIRs. Another paper [14] proposed a compact BPF using multi-mode stub-loaded resonator.…”

Section: Introductionmentioning

confidence: 99%

Bandpass Filter Design With Stub-Loaded Uniform Impedance Resonator and L-Shaped Feed Structure

Wang¹,

Yang²,

Jiang³

2022

PIER Letters

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Microstrip single-band and dual-band bandpass filters (BPFs) are presented in this paper. Firstly, a pair of open-ended stubs of less than λ/4 in length is connected to a uniform impedance resonator (UIR) at two symmetrical positions with respect to its centre, and at the same time other two open-circuited stubs with different lengths are loaded in the middle of the resonator. By virtue of parallel-coupling structure at I/O ports, a single-band BPF is constructed centered at 2.2 GHz with 10.6% 3-dB bandwidth, and two transmission zeros are implemented at the right side of the passband. Next, the L-shaped I/O coupled lines are applied to suppress the inherent spurious response of the stubloaded resonator. As a result, a dual-band BPF with two passbands at 2.2 GHz and 5.2 GHz, which is self-contained with three transmission zeros between the two passbands, is constituted. Finally, the proposed bandpass filters are designed and fabricated to provide an experimental validation for the predicted performances.

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“…In [1,2], the asymmetric transmission zero technique to develop dual pass band filter was described with excellent selectivity and good IL. But the overall size of the filter is an issue to discuss with.…”

Section: Introductionmentioning

confidence: 99%

Dual Pass Band Filter using Quad Stub Loaded Uniform Impedance Resonator

Neogi

Panda

2022

AEM

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A low loss, highly selective and miniaturized dual pass band filter for the wireless (WiMAX, WLAN) application is proposed in this paper. The filter is designed with Multimode resonators, constructed with Uniform Impedance Resonator (UIR) and multiple open stubs. Two different coupling schemes (electronic and magnetic) are observed for the said dual pass bands. A detail analysis about the dimension of the resonators, resonating conditions and frequency calculations are presented in this paper. The dual pass bands are achieved at 3.45 GHz and 5.4 GHz with minimum pass band insertion loss (|IL|) 0.1 and 0.18 dB and the pass band Fractional Band widths (FBW) 4% and 8% respectively. With proper optimizations, Transmission Zeros (TZ) are achieved on both sides of the dual pass bands and the spurious pass band are kept around -20dB level and hence good selectivity is achieved. The overall size of the filter is optimized for the best possible results in terms of Insertion Loss, Return Loss and selectivity, is found to be (24.2 x 21)mm = (0.28 x 0.24)λg = 0.06 λg2.

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Dual-Mode Dual-Band Bandpass Filter With Asymmetrical Transmission Zeros

Cited by 7 publications

References 3 publications

Design and Modelling of a Compact Triband Passband Filter for GPS, WiMAX, and Satellite Applications with Multiple Transmission Zero’s

Design and Modelling of a Compact Triband Passband Filter for GPS, WiMAX, and Satellite Applications with Multiple Transmission Zero’s

Bandpass Filter Design With Stub-Loaded Uniform Impedance Resonator and L-Shaped Feed Structure

Dual Pass Band Filter using Quad Stub Loaded Uniform Impedance Resonator

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