Varactor-tuned wideband band-pass filter for 5G NR frequency bands n77, n79 and 5G Wi-Fi

Golestanifar, Alireza; Karimi, Gholamreza; Lalbakhsh, Ali

doi:10.1038/s41598-022-20593-x

Cited by 8 publications

(5 citation statements)

References 38 publications

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“…In Ref. [7], an ultra-wideband bandpass filter is designed by using coupled branch lines, and the odd and even modes of the filter are analyzed by using equivalent circuits. Ultra-wideband and good stopband harmonic suppression are realized.…”

Section: Measurement and Simulation Resultsmentioning

confidence: 99%

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Design of a Compact Ultra-Wideband Microstrip Bandpass Filter

Chen

et al. 2023

Electronics

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A compact ultra-wideband bandpass filter based on a multilayer printed circuit board (MPCB) structure is proposed in this paper. RO4450F prepreg is used to bond three RO4350B dielectric substrates with different thicknesses in the MPCB structure. The upper surfaces of the three dielectric substrates are respectively provided with copper-coated structures with different patterns. The blind holes and the defected ground structure (DGS) are added to the MPCB of an ultra-wideband bandpass filter. Two groups of loaded quarter-wavelength terminal-open stubs introduce two transmission zeros, which improves the roll-off rates and stopband characteristics, while simple DGS composed of rectangular slots introduces two resonance points in the passband to improve the return loss. Simulation and measurement are consistent. The insertion loss at the center frequency of 12.795 GHz is 0.58 dB and the fractional bandwidth of 3 dB is 40.33% from 10.215 GHz to 15.375 GHz. This bandpass filter can be widely used in wireless and satellite communication.

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Section: Measurement and Simulation Resultsmentioning

confidence: 99%

“…In Ref. [7], an ultra-wideband bandpass filter is designed based on the coupled branch lines, and the even and odd resonance modes of the filter are analyzed by using the equivalent circuit to suppress the stopband harmonics. At the same time, a wide reconfigurable bandwidth range is realized by variable capacitors.…”

Section: Introductionmentioning

confidence: 99%

Design of a Compact Ultra-Wideband Microstrip Bandpass Filter

Chen

et al. 2023

Electronics

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“…The schematic of a hairpin filter designed in ADS is shown in Figure 4 . Figure 5 illustrates the approximate equivalent L-C model for the fundamental hairpin resonator, while Figure 6 displays the approximate equivalent circuit for the entire hairpin filter [ 43 , 44 ]. It is important to emphasise that this LC model is an approximation serving solely to describe the microstrip resonator’s behavior and is not capable of capturing all the intricacies of its response.…”

Section: Design and Simulationmentioning

confidence: 99%

A High-Performance, Low-Cost, and Integrated Hairpin Topology RF Switched Filter Bank for Radar Applications

Alvi,

Ahsan,

Ali

et al. 2024

Sensors

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Switched filter banks find widespread application in frequency-hopping radar systems and communication networks with multiple operating frequencies, especially in situations demanding elevated filter element isolation. In this paper, the design and implementation of a highly isolated switchable narrow-bandpass filter bank architecture using hairpin microstrip topology is presented. The filter bank has four discrete bandpass filters with passbands of 2.0–2.2 GHz, 2.3–2.5 GHz, 3.1–3.3 GHz, and 3.9–4.1 GHz. These filters span the radar S-frequency band (2.0–4.0 GHz). In order to switch between channels with a switching speed of nanoseconds, low-loss and highly isolated SP4T switches are implemented. Advanced design system (ADS) software is used to design the various filter functionalities, and the entire system is tested on a vector network analyzer (VNA). The proposed architecture makes it much easier to put the filter bank into practice and switch it to the desired frequency, which is useful for radar receiver applications.

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“…In addition, other types of resonators, such as spiral ring resonators [13], half-wave resonator [14], split ring resonators [15][16][17] and metamaterial resonators [18] have been used to improve the QHCs performances. Different kinds of resonators have also been applied in other microwave devices like diplexers [19][20][21], filters [22][23][24][25][26][27][28][29], sensors [30,31] and dividers to provide compact size, harmonics suppression and performance improvement.…”

Section: Introductionmentioning

confidence: 99%

A Compact Microwave Quadrature Hybrid Coupler Using Capacitive Composite Lines and Meandered Stubs

Roshani,

Yahya,

Assaad

et al. 2023

Symmetry

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In this paper, a new structure of the quadrature hybrid coupler (QHC) with compact size is proposed using capacitive composite lines and meandered open stubs. The proposed coupler works at 1.6 GHz with a 0.4 GHz bandwidth, which shows 25% fractional bandwidth (FBW). The proposed QHC occupies only 15 mm × 15 mm (0.12 λ × 0.12 λ), while the typical QHC size is 32 mm × 32 mm (0.25 λ × 25 λ) at the same working frequency. In the designed structure, two symmetric meandered stubs and two symmetric π-shaped composite networks including capacitors and microstrip lines are applied together. The designed QHC has a small size and occupies only 22% of the area of the conventional QHC, resulting in a 78% size reduction. The designed prototype has been analyzed, fabricated and tested, and the experimental results verify the simulated and analysis results. The results show a better than 27 dB return loss, more than 28 dB isolation between the output ports and less than 0.4 dB insertion loss at the working frequency of 1600 MHz. With the achieved desirable specifications, the fabricated QHC is a suitable choice for wireless microwave applications.

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Varactor-tuned wideband band-pass filter for 5G NR frequency bands n77, n79 and 5G Wi-Fi

Cited by 8 publications

References 38 publications

Design of a Compact Ultra-Wideband Microstrip Bandpass Filter

Design of a Compact Ultra-Wideband Microstrip Bandpass Filter

A High-Performance, Low-Cost, and Integrated Hairpin Topology RF Switched Filter Bank for Radar Applications

A Compact Microwave Quadrature Hybrid Coupler Using Capacitive Composite Lines and Meandered Stubs

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