Reconfigurable RF Quadrature Patch Hybrid Coupler

Zheng, Shao Yong; Chan, Wing Shing; Wong, Yuk Shing

doi:10.1109/tie.2012.2200224

Cited by 42 publications

(22 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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: 99%

See 1 more Smart Citation

A phase tunable hybrid coupler with enhanced bandwidth

Zheng

Long

2019

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

“…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. For some specific applications, the nonstandard phase difference is usually required.…”

Section: Introductionmentioning

confidence: 99%

A phase tunable hybrid coupler with enhanced bandwidth

Zheng

Long

2019

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

show abstract

“…T HE WIRELESS communication market has experienced remarkable development and growth in terms of new applications and standards [1]- [3]. In order not to contaminate the frequency spectrum, filters are used to suppress the harmonics in the output spectrum [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Differential RF Phase Shifter With Harmonic Suppression

Zheng

Chan

2014

IEEE Trans. Ind. Electron.

View full text Add to dashboard Cite

For the first time, a differential phase shifter with harmonic suppression is proposed. Not only does the proposed structure provide a constant differential phase shift over a wide bandwidth, but it also has good harmonic rejection. Compared to the existing coupled-line phase shifters, the proposed stub-loaded transmission line configurations show good performance, with simplicity in both design and fabrication. Design formulas for the structure are derived using an analytical technique. Optimal design parameters for typical differential phase shifts which are independent of substrate used and operating frequency are provided to allow for a quick design procedure. To illustrate the principles, a broadband 45 • phase shifter with harmonic suppression is designed, fabricated, and measured. It achieved excellent performance with small insertion loss, small phase deviation within the desired bandwidth, and good out-of-band rejection.Index Terms-Harmonic suppression, parallel open/short stubs, phase shifter, stub-loaded transmission line.

show abstract

“…As a result, designing high-performance planar baluns is highly desired and very significant. Apart from out-of-phase output performance, baluns should have inherent impedance transforming function and power dividing features as the couplers [3], [4] and power dividers [5]- [7]. For passive baluns, there are three main kinds, including lumped-type, coil-type, and distributed-type baluns [2]- [8].…”

mentioning

confidence: 99%

A Novel Planar Impedance-Transforming Tight-Coupling Coupler and Its Applications to Microstrip Baluns

Liu

Leung

et al. 2014

IEEE Trans. Compon., Packag. Manufact. Technol.

View full text Add to dashboard Cite

A novel impedance-transforming coupled-line coupler with strong coupling coefficient is proposed in this paper. Its analytical design methodology and applications to microstrip baluns are presented. For demonstration purposes, four numerical examples of this proposed impedance-transforming coupler with different terminated impedances are given. The calculated results show that this proposed coupler not only matches two different groups of terminated impedances but also covers the total power-dividing ratio range from 0 dB to infinite value. The measured results of the fabricated coupler verify the proposed design approach. Finally, this kind of coupler is used to construct a novel planar microstrip balun. This proposed balun has many advantages including planar structure without any via holes, strong coupled lines, and wide operation bandwidth. The experimental results of this proposed balun operating at approximately 2 GHz demonstrated these proposed ideas.

show abstract

Reconfigurable RF Quadrature Patch Hybrid Coupler

Cited by 42 publications

References 26 publications

A phase tunable hybrid coupler with enhanced bandwidth

A phase tunable hybrid coupler with enhanced bandwidth

Differential RF Phase Shifter With Harmonic Suppression

A Novel Planar Impedance-Transforming Tight-Coupling Coupler and Its Applications to Microstrip Baluns

Contact Info

Product

Resources

About