Multisection Ultra-Broadband Directional Coupler Designed in MMIC Technology

Smolarz, Robert; Gruszczyński, Sławomir; Wincza, Krzysztof

doi:10.1109/access.2021.3061384

Cited by 14 publications

(5 citation statements)

References 47 publications

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“…The conventional series DPA depicted in Figure 1b typically employs a single transformer for two-way power combining, providing an OBO range of 6 dB. However, the transformers utilized in such topology generally require high coupling factors exceeding 0.7 [12], which is difficult to achieve in double-sided PCB and MMIC processes [31,32]. Consequently, implementing conventional series Doherty PAs in these processes presents notable challenges.…”

Section: Analysis Of Proposed Three-way Dpamentioning

confidence: 99%

A Broadband Three-Way Series Doherty Power Amplifier with Deep Power Back-Off Efficiency Enhancement for 5G Application

Que,

Li,

Wang

2024

Electronics

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This article presents a new broadband three-way series Doherty power amplifier (DPA) topology, which enables a broadband output power back-off (OBO) efficiency enhancement of up to 10 dB or higher. The proposed DPA topology achieves Doherty load modulation and three-way power combining through a transformer, which requires only a low coupling factor, thus facilitating its implementation in double-sided PCBs or monolithic microwave integrated circuit (MMIC) processes. The design equations for the proposed DPA topology are proposed and analyzed in detail. A proof-of-concept PA at the 2.1–2.8 GHz band using commercial GaN transistors was designed and fabricated to validate the proposed concept. Within the operating frequency band, it achieves a saturated output power (Psat) of 44.5–46.5 dBm with a peak drain efficiency (DE) of 60–72%, and 43–52% DE at 10 dB OBO. Moreover, under a 20 MHz long-term evolution (LTE)-modulated signal, the PA demonstrates a 36.8–37.5 dBm average output power (Pavg) and 47–53% average drain efficiency (DEavg). Notably, the adjacent channel leakage ratio (ACLR) is as low as −35–−28.2 dBc without any digital predistortion (DPD).

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Section: Analysis Of Proposed Three-way Dpamentioning

confidence: 99%

A Broadband Three-Way Series Doherty Power Amplifier with Deep Power Back-Off Efficiency Enhancement for 5G Application

Que,

Li,

Wang

2024

Electronics

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“…In comparison to classic multisection directional couplers, the considered structure requires significantly reduced couplings of coupled-line sections, which allows for realization of directional couplers with bandwidths exceeding one frequency decade. The described concept has been implemented in monolithic process [26], where a strongly coupled-line section has been designed as a threestrip coupled-line structure using two metallization layers. To the best of our knowledge, the presented in [25] and [26] implementations feature the widest bandwidths that are described for quadrature couplers designed in monolithic technologies reaching one frequency decade.…”

Section: Introductionmentioning

confidence: 99%

“…The described concept has been implemented in monolithic process [26], where a strongly coupled-line section has been designed as a threestrip coupled-line structure using two metallization layers. To the best of our knowledge, the presented in [25] and [26] implementations feature the widest bandwidths that are described for quadrature couplers designed in monolithic technologies reaching one frequency decade. However, both circuits are designed in monolithic technologies that offer two metallization layers for passive circuits' implementations.…”

Section: Introductionmentioning

confidence: 99%

Broadband Monolithic GaN Balanced Amplifier Composed of Mixed Cascade-Tandem Directional Couplers and Cascode Stages

Smolarz,

Staszek,

Gruszczynski

et al. 2023

IEEE Access

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In this paper we present a broadband monolithic balanced amplifier reaching 30 dBm output power over a range from 5.7 GHz up to 35.1 GHz. To the best of our knowledge, such broad operational bandwidth has never been reported in literature for balanced topology. The amplifier is composed of broadband tandem-cascade directional couplers and amplifying blocks designed in cascode topology. It is worth noticing that for the first time the mixed tandem-cascade couplers have been integrated in monolithic process, in which only one metallization layer is available for transmission-line structures. The broadband balanced amplifier has been fabricated in high power GH15 gallium nitride (GaN) process offered by United Monolithic Semiconductors (UMS). The measured saturation output power and 1-dB compression point are equal to 30 dBm and 27.8 dBm, respectively.INDEX TERMS balanced amplifier, bandwidth enhancement, broadband amplifier, broadband directional coupler, cascode amplifier, GaN amplifier.

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“…The important specification for a coupler will include: The coupling factor C at the mid-band frequency (usually in dB), permittivity Ԑᵣ and thickness of the substrate of the board, the characteristic impedance of ports Z₀ (usually 50 Ω), bandwidth and center frequency, Lowest acceptable directivity D in dB, and the tolerance of coupling factor over the band (sometimes) [3] [4]. From all of this information, the designer must be find the widths of microstrip lines and the separation between them and the coupled region length and the insertion loss as a function of VSWR or the frequency required over the band, then the values of odd and even mode of characteristic impedances (Zჿ₀ and Zჿₑ) and the final synthesis problem is then identical to that a couple [5]. The manner of Bryant and Weiss to synthesis technique of the shape ratios (w/h and s/h) are determined from (Zჿ₀ and Zჿₑ), then using these values w/h and s/h, recalculate Zჿ₀ and Zჿₑ that means of the semi-empirical analysis formulae.…”

Section: Introductionmentioning

confidence: 99%

Design and implementation of microstrip directional coupler for satellite communication application

Mahmood¹

2022

4th International Conference on Communication Engineering and Computer Science (CIC-COCOS’2022)

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This paper proposes to design a microstrip directional coupler with a -10 dB coupling factor with high directivity working in S-band within frequency 2.25 GHz by using Aktarzad, ROW Botham and Jones way to give high accuracy. The calculation of shape ratio w/h and space ratio s/h synthesis by Bryant and Weiss technique. The paper takes all the representation of design by using the calculations of main parameters and Computer-aided design - CAD to arrive at the optimization case. The manufactured device by using Rogers 3003 microwave board and is measured by a spectrum network analyzer. The comparison between the results of software and practical measurements gives perfect close results. This paper shows the better steps to design the parameters of a microstrip directional coupler with high directivity

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Multisection Ultra-Broadband Directional Coupler Designed in MMIC Technology

Cited by 14 publications

References 47 publications

A Broadband Three-Way Series Doherty Power Amplifier with Deep Power Back-Off Efficiency Enhancement for 5G Application

A Broadband Three-Way Series Doherty Power Amplifier with Deep Power Back-Off Efficiency Enhancement for 5G Application

Broadband Monolithic GaN Balanced Amplifier Composed of Mixed Cascade-Tandem Directional Couplers and Cascode Stages

Design and implementation of microstrip directional coupler for satellite communication application

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