Effect of Center Frequency Deviation in Miniaturized CMOS Bandpass Filter

A corrugated disk resonator with eight grooves is proposed for wideband bandpass filter (BPF) design. Due to the spoof localized surface plasmons resonances of the corrugated metallic structure, the dipole, quadrupole, hexapole modes, and a fundamental mode excited by the introduced short-circuited via holes are employed to realize four transmission poles (TPs) in the passband. The theoretical analysis is described by the electric field and current distributions on the resonator. The resonant frequencies can be tuned easily by the parameters of the structure, which can be used to adjust the center frequency and bandwidth of the BPF freely. Furthermore, two resonators are cascaded to obtain eight TPs to improve the selectivity performance. Finally, three fabricated filters demonstrate the design method.

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A microstrip bandpass filter with tunable bandwidth and center frequency

Microwave and Optical Technology Letters ◽

10.1002/mop.32909 ◽

2021 ◽

Author(s):

Anrong Chen ◽

Tao Yang

Keyword(s):

Bandpass Filter ◽

Center Frequency

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Compact dual-mode microstrip bandpass filter based on slotted square patch resonator

Microelectronics International ◽

10.1108/mi-08-2021-0080 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Karthie S. ◽

Zuvairiya Parveen J. ◽

Yogeshwari D. ◽

Venkadeshwari E.

Keyword(s):

Bandpass Filter ◽

Filter Design ◽

Center Frequency ◽

Dual Mode ◽

Content Type ◽

Transmission Zeros ◽

Compact Size ◽

Mode Response ◽

Better Than ◽

Good Agreement

Purpose The purpose of this paper is to present the design of a compact microstrip bandpass filter (BPF) in dual-mode configuration loaded with cross-loop and square ring slots on a square patch resonator for C-band applications. Design/methodology/approach In the proposed design, the dual-mode response for the filter is realized with two transmission zeros (TZs) by the insertion of a perturbation element at the diagonal corner of the square patch resonator with orthogonal feed lines. Such TZs at the edges of the passband result in better selectivity for the proposed BPF. Moreover, the cross-loop and square ring slots are etched on a square patch resonator to obtain a miniaturized BPF. Findings The proposed dual-mode microstrip filter fabricated in RT/duroid 6010 substrate using PCB technology has a measured minimum insertion loss of 1.8 dB and return loss better than 24.5 dB with a fractional bandwidth (FBW) of 6.9%. A compact size of 7.35 × 7.35 mm2 is achieved for the slotted patch resonator-based dual-mode BPF at the center frequency of 4.76 GHz. As compared with the conventional square patch resonator, a size reduction of 61% is achieved with the proposed slotted design. The feasibility of the filter design is confirmed by the good agreement between the measured and simulated responses. The performance of the proposed filter structure is compared with other dual-mode filter works. Originality/value In the proposed work, a compact dual-mode BPF is reported with slotted structures. The conventional square patch resonator is deployed with cross-loop and square ring slots to design a dual-mode filter with a square perturbation element at its diagonal corner. The proposed filter exhibits compact size and favorable performance compared to other dual-mode filter works reported in literature. The aforementioned design of the dual-mode BPF at 4.76 GHz is suitable for applications in the lower part of the C-band.

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An Integrated Two-Mode Tunable Channelized Low-Noise Active Filter

Journal of Circuits System and Computers ◽

10.1142/s0218126618500901 ◽

2018 ◽

Vol 27 (06) ◽

pp. 1850090

Author(s):

Amin Alahyari ◽

Massoud Dousti ◽

Mohammad Bagher Tavakoli

Keyword(s):

Bandpass Filter ◽

Impedance Matching ◽

Low Noise ◽

Active Filter ◽

Center Frequency ◽

Pass Filter ◽

Filter Output ◽

Band Stop Filter ◽

Circuit Input

In this paper, a new structure for an integrated channelized active filter is proposed. This filter can be used as a channelized bandpass filter and again as a channelized band-stop filter. This is fulfilled by using one biasing voltage. In designing a three-channel bandpass filter, a recursive differential structure is used. Moreover, by subtracting bandpass filter output from an all-pass output, the proposed three-channel band-stop filter is achieved. A wideband amplifier plays the role of an all-pass filter. In addition, to decrease the noise of this filter, a noise-canceling circuit is adopted. By using this circuit, input impedance matching is obtained simultaneously. The center frequencies of the two-mode channelized filter are 2, 4 and 6[Formula: see text]GHz. In each of them, the center frequency is controlled via two biasing voltages. The maximum center frequency shift is 450[Formula: see text]MHz. For designing the proposed circuit, GaAs 0.15[Formula: see text][Formula: see text]m technology is applied. The occupied area is [Formula: see text][Formula: see text]mm2.

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A semi-lumped microstrip UWB bandpass filter

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078709000117 ◽

2009 ◽

Vol 1 (1) ◽

pp. 57-64 ◽

Cited By ~ 1

Author(s):

Darine Kaddour ◽

Jean-Daniel Arnould ◽

Philippe Ferrari

Keyword(s):

Group Delay ◽

Bandpass Filter ◽

Filter Design ◽

Sensitivity Study ◽

Critical Parameters ◽

Center Frequency ◽

Pass Filter ◽

Low Pass Filter ◽

Low Pass ◽

High Pass

In this paper, a miniaturized bandpass filter for ultra-wide-band applications is proposed. It is based on the embedding of high-pass structures in a low-pass filter. A semi-lumped technology combining surface-mounted capacitors and transmission lines has been used. The filter design rules have been carried out. Furthermore, two filters having a 3-dB fractional bandwidth of 142 and 150%, centered at 0.77 and 1 GHz, respectively, have been realized for a proof of concept. Measured characteristics, in good agreement with simulations, show attractive properties of return loss (|S11| <−18 dB), insertion loss (<0.3 dB), and a maximum group delay and group delay variation of 2 and 1.3 ns, respectively. A distributed filter based on the same low-pass/high-pass approach has been also realized and measured for comparison. The size reduction reaches 85% for the semi-lumped filter, and its selectivity is improved with a shape factor of 1.3:1 instead of 1.5:1. The semi-lumped filter's drawback is related to a smaller rejection bandwidth compared to the distributed one. To improve the high-frequency stopband, an original technique for spurious responses suppression based on capacitively loaded stubs has been proposed. Even if the performances do not reach that obtained for the distributed approach, with this technique spurious responses are pushed until eight times the center frequency. A sensitivity study vs. critical parameters has also been carried out, showing the robustness of the design.

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A Microfabricated Bandpass Filter with Coarse-Tuning and Fine-Tuning Ability Based on IPD Process and PCB Artwork

Micromachines ◽

10.3390/mi13010123 ◽

2022 ◽

Vol 13 (1) ◽

pp. 123

Author(s):

Junzhe Shen ◽

Tian Qiang ◽

Minjia Gao ◽

Yangchuan Ma ◽

Junge Liang ◽

...

Keyword(s):

Printed Circuit Board ◽

Bandpass Filter ◽

Fine Tuning ◽

Circuit Board ◽

Center Frequency ◽

Spiral Inductor ◽

Chip Area ◽

Transmission Zero ◽

Capacitance Variation ◽

Zero Frequency

In this paper, a bandpass filter (BPF) was developed utilizing GaAs-based integrated passive device technology which comprises an asymmetrical spiral inductor and an interleaved array capacitor, possessing two tuning modes: coarse-tuning and fine-tuning. By altering the number of layers and radius of the GaAs substrate metal spheres, capacitance variation from 0.071 to 0.106 pF for coarse-tuning, and of 0.0015 pF for fine-tuning, can be achieved. Five air bridges were employed in the asymmetrical spiral inductor to save space, contributing to a compact chip area of 0.015λ0 × 0.018λ0. The BPF chip was installed on the printed circuit board artwork with Au bonding wire and attached to a die sink. Measured results demonstrate an insertion loss of 0.38 dB and a return loss of 21.5 dB at the center frequency of 2.147 GHz. Furthermore, under coarse-tuning mode, variation in the center frequency from 1.956 to 2.147 GHz and transmission zero frequency from 4.721 to 5.225 GHz can be achieved. Under fine-tuning mode, the minimum tuning value and the average tuning value of the proposed BPF can be accurate to 1.0 MHz and 4.7 MHz for the center frequency and 1.0 MHz and 12.8 MHz for the transmission zero frequency, respectively.

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Sharp Skirt Dual-Mode Bandpass Filter with Overlay Plate to Control Upper Passband Edge

International Journal of Engineering and Advanced Technology - Regular Issue ◽

10.35940/ijeat.f8648.088619 ◽

2019 ◽

Vol 8 (6) ◽

pp. 2357-2360

Keyword(s):

Analytical Model ◽

Insertion Loss ◽

Return Loss ◽

Bandpass Filter ◽

Center Frequency ◽

Dual Mode ◽

Rf Receivers ◽

Attenuation Level ◽

Frequency Selective ◽

Fixed Center

This paper presents design and analytical model for Sharp Skirt Dual-Mode Bandpass Filter for RF receivers. Proposed filter is designed using open stub loaded H shaped resonator. Based on analytical model insertion loss S21 and return loss S11 for proposed filter are demonstrated. Inductive Overlaying plate is proposed to control upper passband edge of proposed filter to improve frequency selectivity with fixed center frequency. The proposed filter has sharp frequency selective range from 5.1GHz to 9.2GHz. With overlay plate, frequency selective range is tuned to 5.1GHz-8.6GHz. Without overlaying plate the proposed filter has return loss greater than 10dB and insertion loss of 0.7dB. Lower and upper passband edges are at 5.1GHz and 9.2GHz with attenuation level of 52dB and 54dB respectively. With overlaying plate, the filter has same S 11 and S 21 parameters, but upper passband edge is shifted from 9.2GHz to 8.6GHz

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Effect of the defected microstrip structure shapes on the performance of dual-band bandpass filter for wireless communications

Bulletin of Electrical Engineering and Informatics ◽

10.11591/eei.v10i1.2662 ◽

2021 ◽

Vol 10 (1) ◽

pp. 232-240

Author(s):

Mussa Mabrok ◽

Zahriladha Zakaria ◽

Yully Erwanti Masrukin ◽

Tole Sutikno ◽

Hussein Alsariera

Keyword(s):

Wireless Communication ◽

Communication Systems ◽

Bandpass Filter ◽

Dual Band ◽

Center Frequency ◽

Wireless Communication Systems ◽

Notch Band ◽

Quarter Wavelength ◽

Crucial Component ◽

Microstrip Structure

Due to the progression growth of multiservice wireless communication systems in a single device, multiband bandpass filter has attract a great attention to the end user. Therefore, multiband bandpass filter is a crucial component in the multiband transceivers systems which can support multiple services in one device. This paper presents a design of dual-band bandpass filter at 2.4 GHz and 3.5 GHz for WLAN and WiMAX applications. Firstly, the wideband bandpass filter is designed at a center frequency of 3 GHz based on quarter-wavelength short circuited stub. Three types of defected microstrip structure (DMS) are implemented to produce a wide notch band, which are T-inversed shape, C-shape, and U- Shape. Based on the performance comparisons, U-shaped DMS is selected to be integrated with the bandpass filter. The designed filter achieved two passbands centered at 2.51 GHz and 3.59 GHz with 3 dB bandwidth of 15.94 % and 15.86 %. The proposed design is very useful for wireless communication systems and its applications such as WLAN and WiMAX

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