Compact Planar Microstrip Branch-Line Couplers Using the Quasi-Lumped Elements Approach With Nonsymmetrical and Symmetrical T-Shaped Structure

Liao, Shry‐Sann; Peng, Jen-Ti

doi:10.1109/tmtt.2006.880650

Cited by 138 publications

(66 citation statements)

References 24 publications

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“…In the next step, the size of the structure is decreased. There are several methods to minimize the coupler's size such as π-equivalent model [5,6], T-shaped structure [7], dual TLs [8], quasi-lumped elements [9,10], and fractal structure [11]. Defected Ground Structure (DGS) [12] and loading the transmission lines of couplers with inductance (L) and capacitance are used to reduce the size of the system.…”

Section: Design Proceduresmentioning

confidence: 99%

“…In order to reach the requirements of telecommunication systems, various techniques and methods have been used to create different types of feeding networks such as sequential rotation and series-parallel feeding network and feeding networks based in CORPS, Butler matrix, etc. [1,[2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. In [2], a feeding network consists of seven quarter-wavelength transformers linked together in a sequential rotation manner with alternative parallel and series connection to form a frontport network.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Novel Compact Feeding Network for Array Antenna

Mohammadi¹,

Piroutiniya²

2016

PIER Letters

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Abstract-A novel feeding network is investigated both theoretically and experimentally. The proposed system with combination of a Wilkinson power divider and two branch-Line couplers is established. The output signals of the system have the same amplitude and 90 • phase difference with each other. The size reduction technique is applied to minimize the physical size of the proposed network. In this technique, the ground of the structure is defected, and distributed capacitors and inductors are added to empty space of the branch-line couplers. Moreover, meandered lines are used in order to match the output impedance of the Wilkinson power divider arms and reduce its size. The initial design realized in 2.5 GHz shows the fractional bandwidth of 24%. Then a miniaturized structure is fabricated with 42% smaller size than the main structure while it shows similar electrical performance. For both cases, measurement and simulation results are in good agreement with each other.

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Section: Design Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel Compact Feeding Network for Array Antenna

Mohammadi¹,

Piroutiniya²

2016

PIER Letters

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“…In general, various techniques for reducing the size of the branch-line couplers have been proposed, such as lumped elements, open end stub, loaded coupled transmission lines, split ring resonators, slow-wave loading, left-handed (LH) cell, series capacitive gap, and photonic-band gap (PBG) structures. However, lumped element approach is more suitable for MMIC applications [10][11][12]. Another approach is by using the combination of loaded coupled transmission lines and complementary split ring resonators (CSRRs) as reported in [13] and T -shaped slow-wave loading directly inside the coupler [9,11] is implemented.…”

Section: Size Reduction Of Branch-line Couplermentioning

confidence: 99%

“…However, lumped element approach is more suitable for MMIC applications [10][11][12]. Another approach is by using the combination of loaded coupled transmission lines and complementary split ring resonators (CSRRs) as reported in [13] and T -shaped slow-wave loading directly inside the coupler [9,11] is implemented. Alternatively, LH cell composed by a CSRR etched in the ground plane and series of capacitive gap reduces the length of the required 270± line by a factor of 5 [14].…”

Section: Size Reduction Of Branch-line Couplermentioning

confidence: 99%

Beam Forming Networks Using Reduced Size Butler Matrix

Muhammad

Rahim

Jizat

et al. 2010

Wireless Pers Commun

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Recent trend shows that the reduced size couplers are becoming potential building blocks and have created a continuing demand for the growing wireless communications market. Therefore, this paper presents a new design and realization for reducing the size of the branch-line coupler using eight two-step stubs that operates at 2.45 GHz. In this study, the reduced size branch-line coupler has been implemented on a 4 × 4 Butler Matrix, which generally consists of branch-line coupler, crossover, and phase shifter. The simulation results are obtained by using the advanced design system (ADS) in terms of S-Parameter analysis and the phase difference between the ports. Moreover, this design is realized on a low-cost substrate, e.g., flame resistance board (FR4 Board). The obtained results show that the proposed design has reduced the electrical length of transmission line up to 50% and consequently, the area of the branch-line coupler has been reduced up to 30% from the normal size.

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“…Transmission line loaded with quasi-lumped elements has been introduced in [6]. In this article, we proposed a new open-loop resonator loaded with this type of quasi-lumped elements.…”

Section: Slow-wave Open-loop Resonatormentioning

confidence: 99%

Design of microstrip filter based on slow‐wave open‐loop resonator

Zhang

et al. 2009

Micro & Optical Tech Letters

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A microstrip bandpass filter implemented with slow‐wave open‐loop resonators is described in this article. The slow‐wave open‐loop resonators make the filter compact and allow the implementation of positive and negative inter‐resonator couplings. Implementation of the positive and negative couplings is used to introduce a pair of finite frequency transmission‐zeros in the filter response. The two zeros are designed to be close to the passband, thus improving the selectivity of the filter. As an example, a fourth‐order cross‐coupled filter is fabricated. The experimental results are demonstrated and discussed. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1057–1060, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24232

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Compact Planar Microstrip Branch-Line Couplers Using the Quasi-Lumped Elements Approach With Nonsymmetrical and Symmetrical T-Shaped Structure

Cited by 138 publications

References 24 publications

A Novel Compact Feeding Network for Array Antenna

A Novel Compact Feeding Network for Array Antenna

Beam Forming Networks Using Reduced Size Butler Matrix

Design of microstrip filter based on slow‐wave open‐loop resonator

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