Highly Reconfigurable Quadrature Coupler With Ideal Impedance Matching and Port Isolation

Chi, Pei‐Ling; Hsu, T. H.

doi:10.1109/tmtt.2017.2668412

Cited by 39 publications

(19 citation statements)

References 21 publications

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“…To solve the only unknown parameter C, one of these equations can be used. As an example, the operating frequency is here chosen as 1.8 GHz, the required value of loading capacitance C is calculated as 4.4 pF by substituting the determined values into Equations (13) and (14) and (16). For validation, other S-parameters at the same operating frequency are calculated by substituting the determined values into Equations (13) and (14).…”

Section: Analysis Of the Detailed Configurationmentioning

confidence: 99%

“…Besides, the tunability in coupling coefficient was also reported . As an extension, the simultaneous tunability in frequency and coupling coefficient can be implemented within a single structure . Moreover, the simultaneous reconfigurability in coupling coefficient and port can be implemented as well on a patch coupler …”

Section: Introductionmentioning

confidence: 96%

“…[11][12][13][14] As an extension, the simultaneous tunability in frequency and coupling coefficient can be implemented within a single structure. 15,16 Moreover, the simultaneous reconfigurability in coupling coefficient and port can be implemented as well on a patch coupler. 17 All these coupler configurations only consider the standard 90 or 180 phase differences.…”

Section: Introductionmentioning

confidence: 99%

“…5. Calculate the value of loading capacitance C to provide the quadrature equal power division characteristics using Equations (13) and (14) and (16). 6.…”

mentioning

confidence: 99%

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A phase tunable hybrid coupler with enhanced bandwidth

Zheng

Long

2019

Int J RF Microw Comput Aided Eng

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The majority of the previous works on tunable coupler concentrates on the tunability of the frequency and amplitude. The capability to control the phase characteristics draws little attention. However, the tunability in phase becomes more and more important, as the flexible control in phase affects the performance significantly in the modern wireless communication systems. Regarding this, several phase tunable couplers were proposed but with narrow bandwidth. In this article, a novel phase‐tunable coupler with enhanced bandwidth is proposed. It is constructed by introducing two varactor loaded coupled line sections between two branch line sections. By varying the capacitances loaded on and between the coupled lines, the continuously tunable phase difference can be achieved between two output ports without affecting the equal power division characteristics. The analysis of the ideal model and detailed circuit has been conducted to obtain the design formulas and guidelines. For demonstration, a phase tunable coupler operating at 1.8 GHz was designed, fabricated, and measured. It exhibits a tunable phase difference from 60° to 120° by varying the two biasing voltages. Meanwhile, the equal power division, good return loss, and high isolation are still maintained. The desired characteristics have been implemented over a wide bandwidth from 1.6 GHz to 2.0 GHz.

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Section: Analysis Of the Detailed Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

“…5. Calculate the value of loading capacitance C to provide the quadrature equal power division characteristics using Equations (13) and (14) and (16). 6.…”

mentioning

confidence: 99%

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A phase tunable hybrid coupler with enhanced bandwidth

Zheng

Long

2019

Int J RF Microw Comput Aided Eng

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“…Reconfigurable or high-performance microwave devices, such as power dividers [1]- [3], phase shifters [4]- [7], couplers [8]- [10], and filters [11]- [33], are extensively studied in past several years. Due to the reconfigurability, these key components used in modern wireless communication systems are capable to realize the agile frequency to support different standards, as well as reduce the size and complexity of systems.…”

Section: Introductionmentioning

confidence: 99%

Simple Coupled-Line Tunable Bandpass Filter With Wide Tuning Range

Chen

Yang

et al. 2020

IEEE Access

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In this paper, a tunable bandpass filter using coupled line with a wide tuning range is proposed. The proposed filter has a simple structure which is composed of a coupled-line section and two pairs of varactors. Meanwhile, simultaneously tuning on bandwidth and center frequency are introduced by varactors. The tunability is mainly realized by varactors connected to one end of the coupled line and varactors between ports and coupled line provide an impedance matching. A theoretical analysis is presented to illustrate the tunability by using even-and odd-mode theory. Additionally, the detailed effect of the two types of varactors is researched, respectively. To verify the concept, a prototype is designed, fabricated, and measured. The transmission zero exhibited in measurement is introduced by bias circuits. The measured results show that the tunable bandpass filter achieves a tunable center frequency of 0.494-1.257 GHz (87.15%) and a 3-dB bandwidth of 0.282-0.943 GHz (334%). INDEX TERMS Bandpass filter, coupled line, tunable filter, wide tuning range.

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A compact dual‐functional component for spatial diversity and multiplexing applications

Sun

Zhou

Zhang

et al. 2021

Int J RF Mic Comp-Aid Eng

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This paper presents a new compact four‐port component with dual‐functional dual‐mode characteristics for spatial diversity and multiplexing applications. The component can achieve the 3‐dB hybrid coupler mode at the lower frequency and the transmission line mode at the higher frequency, corresponding to spatial diversity and multiplexing applications, respectively. The proposed component is designed based on a three‐section crossover and analyzed based on the Even‐odd model analysis. It features good S‐parameter characteristics, compact size, and none of the RF switches. A component working at 4.5‐/5.4‐GHz has been fabricated and measured to prove its design theory. To practice, the proposed component is applied to a 1 × 2 wideband Yagi antenna array. The measured results show diversity beams and multiplexing beams at two operating bands respectively, suitable for complex wireless communication systems.

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Highly Reconfigurable Quadrature Coupler With Ideal Impedance Matching and Port Isolation

Cited by 39 publications

References 21 publications

A phase tunable hybrid coupler with enhanced bandwidth

A phase tunable hybrid coupler with enhanced bandwidth

Simple Coupled-Line Tunable Bandpass Filter With Wide Tuning Range

A compact dual‐functional component for spatial diversity and multiplexing applications

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