Design of Miniaturized Branch-Line Coupler Based on Novel Spiral-Based Resonators

Lan, Ke; Wang, G.-M.; Zhang, C.-X.; Wang, Y.-W.

doi:10.1163/156939311798147024

Cited by 15 publications

(4 citation statements)

References 21 publications

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“…As can be seen from Figure 5, the proposed branch-line coupler without any lumped elements, via-holes and defected ground structures (DGS) can be fabricated easily. In addition, the characteristics of other published CRLH Branch-line Couplers [15,16] are tabulated in Table 2 and compared to the proposed one. The proposed compact CRLH Branch-line Coupler has a more considerable size reduction and easily fabricated configuration, though the bandwidth is not broad enough.…”

Section: Branch-line Coupler Designed Fabricated and Measuredmentioning

confidence: 99%

Compact Branch-Line Coupler Using Uniplanar Spiral Based CRLH-Tl

Zhang¹,

Tao²,

Zong³

et al. 2015

PIER Letters

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In this letter, a compact branch-line coupler using a new type of uniplanar composite right/left-handed transmission line (CRLH-TL) is proposed. The transmission line is obtained by etching spiral structure and series meandered capacitive gaps at both ends on the host line. With the aid of lumped element equivalent circuit model and dispersion relations, the CRLH property of the line is studied. By using the proposed structures, the 90-degree phase shift 35.35 ohm and 50 ohm transmission lines are designed for a compact branch-line coupler operating at 1 GHz. Its occupied size is only 32.5% of that of the conventional one. Its uniplanar prototype makes it very useful for wireless communication systems requiring high encapsulation quality.

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Section: Branch-line Coupler Designed Fabricated and Measuredmentioning

confidence: 99%

Compact Branch-Line Coupler Using Uniplanar Spiral Based CRLH-Tl

Zhang¹,

Tao²,

Zong³

et al. 2015

PIER Letters

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show abstract

“…A compact size was achieved in the designed coupler in [12], using coupler resonators in the structure of the conventional coupler. 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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“…In many designs [2][3][4][5], low-pass filters (LPFs) are used as the coupler branches to miniaturize the structure and suppress the harmonics. This technique gives good results but increases the design complexity and the insertion loss.…”

Section: Introductionmentioning

confidence: 99%

Design and Fabrication of a Compact Branch-Line Coupler Using Resonators with Wide Harmonics Suppression Band

et al. 2022

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The branch-line coupler (BLC) is an important device in radio frequency (RF) and microwave (MW) circuits. The main drawbacks of the conventional BLC are as follows: first, the four long quarter-wavelength (λ/4) transmission line sections occupy a large size, especially at the low frequencies, and second, the presence of unwanted harmonics. This research paper presents a compact 750 MHz BLC with harmonics suppression using resonators. The typical BLC consists of four λ/4 branches, two series arms of 35 Ω and two shunt arms of 50 Ω impedances. In the proposed BLC, these long branches are replaced with two types of compact resonators. The proposed resonators have the same responses at the operating frequency of 750 MHz and suppress higher frequencies. The designed BLC is simulated, fabricated and measured. The results show that the proposed BLC has good performance at 750 MHz with a bandwidth of 200 MHz, which provides more than 26% fractional bandwidth (FBW). It has a very compact size, about 84% size reduction, as compared with the typical BLC. Moreover, the fabricated BLC suppresses the 2nd up to 7th unwanted harmonics with a high suppression level.

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Design of Miniaturized Branch-Line Coupler Based on Novel Spiral-Based Resonators

Cited by 15 publications

References 21 publications

Compact Branch-Line Coupler Using Uniplanar Spiral Based CRLH-Tl

Compact Branch-Line Coupler Using Uniplanar Spiral Based CRLH-Tl

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

Design and Fabrication of a Compact Branch-Line Coupler Using Resonators with Wide Harmonics Suppression Band

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