A miniaturized directional coupler with high isolation for RFID reader

Zhang, Qianqian; Zhou, Yunfei; Qian, Guoming

doi:10.1109/icuwb.2016.7790496

Cited by 13 publications

(3 citation statements)

References 6 publications

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“…It should be noted that these results were not taken in an anechoic chamber, but in a typical laboratory space where there were reflections from the walls, metal enclosed equipment and the researcher taking the measurements. These results show a higher isolation than other published tuneable rat-race couplers [7,8,9]. However, those results were taken with a 50 Ω load at port 2, whereas these are with the commercial sleeve dipole, so are not completely comparable, but do justify the value of this simpler tuneable rat-race implementation.…”

Section: Measured Resultsmentioning

confidence: 55%

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A tuneable rat-race coupler for full duplex communications

Watkins

2021

Int. J. Microw. Wireless Technol.

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Full duplex (FD) could potentially double wireless communications capacity by allowing simultaneous transmission and reception on the same frequency channel. A single antenna architecture is proposed here based on a modified rat-race coupler to couple the transmit and receive paths to the antenna while providing a degree of isolation. To allow the self-interference cancellation (SiC) to be maximized, the rat-race coupler was made tuneable. This compensated for both the limited isolation of the rat race and self-interference caused by antenna mismatch. Tuneable operation was achieved by removing the fourth port of the rat race and inserting a variable attenuator and variable phase shifter into the loop. In simulation with a 50 Ω load on the antenna port, better than −65 dB narrowband SiC was achieved over the whole 2.45 GHz industrial, scientific and medical (ISM) band. Inserting the S-parameters of a commercially available sleeve dipole antenna into the simulation, better than −57 dB narrowband SiC could be tuned over the whole band. Practically, better than −58 dB narrowband tuneable SiC was achieved with a practical antenna. When excited with a 20 MHz Wi-Fi signal, −42 dB average SiC could be achieved with the antenna.

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Section: Measured Resultsmentioning

confidence: 55%

“…Most published FD system level study uses circulators as the combining network [5] because they have low (<1 dB) insertion loss but are often too large and expensive for consumer electronics. Transmission line networks like the rat-race coupler [6], hybrid coupler [1] and directional coupler [7] provide a more practical solution.…”

Section: Introductionmentioning

confidence: 99%

A tuneable rat-race coupler for full duplex communications

Watkins

2021

Int. J. Microw. Wireless Technol.

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“…With the development of modern communication technology, the demand for miniaturization and lightweight of communication components is increasing [1], so the study of microwave passive device miniaturization has important significance. As a key element in RF microwave system, branch line couplers are used for power distribution and combination [2][3][4]. At the lower frequency of the microwave band, the size of a conventional branch line coupler is too large for practical use [5].…”

Section: Introductionmentioning

confidence: 99%

A miniature TSV-based branch line coupler using π equivalent circuit model for transmission line

Wang

Xiao

Yin

et al. 2022

IEICE Electron. Express

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A miniaturized lumped element branch line coupler with πtype equivalent circuit is proposed, the design of branch line coupler has been carried out for S-band. The lumped element in the branch line coupler is realized by TSV, and the coupler is simulated and verified by industrial simulation software HFSS. The results show that the return loss is greater than 19 dB, the isolation is better than 20 dB, and the insertion loss is less than 1.53 dB at the frequency of 2.1-2.4 GHz. The size of the miniature TSV-based branch line coupler is only 0.660×0.630mm 2 (0.018×0.017λg 2 ).

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