Single-Layer Microstrip High-Directivity Coupled-Line Coupler With Tight Coupling

Wu, Yongle; Sun, Wenguang; Leung, S.W.; Diao, Yinliang; Chan, Kwok Hung; Siu, Y.M.

doi:10.1109/tmtt.2012.2235855

Cited by 78 publications

(50 citation statements)

References 22 publications

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“…The matching networks are carefully regulated when they are bias at Class AB and Class C, respectively. A novel coupled-line coupler in [18] is synthesized as an uneven power-dividing splitter. Its basic configuration is shown in Figure 1(b).…”

Section: The Proposed Circuit and Design Approachmentioning

confidence: 99%

“…Figure 1. The circuit configuration of (a) the proposed broadband Doherty PA, (b) the novel coupler proposed in [18].…”

Section: Matching Networkmentioning

confidence: 99%

“…In this work, a novel symmetrical coupler maintaining tight-coupling performance of 3-dB given in [18], is redesigned to achieve an uneven coupling characteristic. The basic configuration of the coupler is illustrated in Figure 1(b).…”

Section: Broadband Couplermentioning

confidence: 99%

See 2 more Smart Citations

A Tradeoff Design of Broadband Power Amplifier in Doherty Configuration Utilizing a Novel Coupled-Line Coupler

Ye¹,

Wu²,

Liu³

2014

PIER C

Self Cite

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Abstract-A broadband power amplifier designed and implemented in Doherty configuration is illustrated in this paper. Both input and output networks adopt the broadband matching topology. Additionally a compensation network, consisting of a series transmission line shunted with a capacitance, is set behind the peak amplifier to avoid in-band power leakage in the low-power section while at the cost of peak output power in partial band. A novel coupler is designed as an uneven power-divided splitter and experimentally validated for a broadband power amplifier module. A tradeoff of bandwidth, efficiency and output power is fulfilled through parameters select and postproduction tuning. According to the measured results, the proposed broadband Doherty power amplifier achieves an average saturated output power of 42 dBm, an average gain of 10.6 dB, an average peak and 6 dB back-off efficiency of 48.4% and 32.8%, respectively, and a fractional bandwidth of 51.4%, from 1.3 GHz to 2.2 GHz. The adjacent channel power ratio is better than −40 dBc when the amplifier is driven with 10-MHz QPSK signal, thus exhibiting a high linearity performance.

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Section: The Proposed Circuit and Design Approachmentioning

confidence: 99%

“…Figure 1. The circuit configuration of (a) the proposed broadband Doherty PA, (b) the novel coupler proposed in [18].…”

Section: Matching Networkmentioning

confidence: 99%

See 1 more Smart Citation

A Tradeoff Design of Broadband Power Amplifier in Doherty Configuration Utilizing a Novel Coupled-Line Coupler

Ye¹,

Wu²,

Liu³

2014

PIER C

Self Cite

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show abstract

“…These properties will degrade the performance of the coupler. Therefore, much work has been reported in recent years to achieve both compact design and harmonic suppression for the branch-line coupler [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

A New Miniaturized Microstrip Branch-Line Coupler With Good Harmonic Suppression

Lian¹,

Wang²,

He³

et al. 2017

PIER Letters

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Abstract-A new miniaturized microstrip branch-line coupler with good harmonic suppression is proposed in this paper. The new structure has two significant advantages, which not only effectively reduces the occupied area to 20.4% of the conventional branch-line coupler at 0.96 GHz, but also has high 6th harmonic suppression performance. The measured results indicate that a bandwidth of more than 120 MHz has been achieved while the phase difference between S 21 and S 31 is within 90 • ± 1 • . The measured bandwidth of |S 21 | and |S 31 | within 3 ± 0.3 dB are 145 MHz and 150 MHz, respectively. Furthermore, the measured insertion loss is comparable to that of a conventional branch-line coupler. The new coupler can be easily implemented by using the standard printed-circuit-board etching processes and is very useful for wireless communication systems.

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“…Since it is difficult to obtain large impedance difference, tight coupling is difficult to realize unless extremely small spacing between the coupled lines is used [1]. Multi-section coupled-line coupler is introduced [2] to realize tight coupling, but this technique increases the size and design complexity of the circuit.…”

Section: Introductionmentioning

confidence: 99%

A Semi-Elliptical Wideband Directional Coupler

Lo¹,

Chung²,

Lim³

2017

PIER C

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Abstract-A new design of wideband directional couplers using a semi-elliptical edge-coupled structure is presented. This structure consists of two semi-elliptical patches on the top layer and an elliptical defected ground plane on the bottom layer to increase the coupling coefficient and operating bandwidth. Even and odd mode analysis is performed, and sets of design graphs are formulated to facilitate the design of the coupler on substrate with dielectric constants of 2.2 and 3.38. The operating frequency and coupling are controlled by the dimensions of the elliptical patch and the size of the air gap. Compared to the conventional parallel-microstrip coupler which requires extremely narrow air gap to achieve tighter coupling factor, the semi-elliptical coupler allows for wider air gap to be used, and it reduces fabrication difficulty. Both simulation and measurement results show that the proposed design exhibits wideband characteristic with a bandwidth ratio of more than 2.4 with a coupling deviation of ±1 dB.

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Single-Layer Microstrip High-Directivity Coupled-Line Coupler With Tight Coupling

Cited by 78 publications

References 22 publications

A Tradeoff Design of Broadband Power Amplifier in Doherty Configuration Utilizing a Novel Coupled-Line Coupler

A Tradeoff Design of Broadband Power Amplifier in Doherty Configuration Utilizing a Novel Coupled-Line Coupler

A New Miniaturized Microstrip Branch-Line Coupler With Good Harmonic Suppression

A Semi-Elliptical Wideband Directional Coupler

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