RF Co-Designed Bandpass Filters/Isolators Using Nonreciprocal Resonant Stages and Microwave Resonators

Ashley, Andrea; Psychogiou, Dimitra

doi:10.1109/tmtt.2021.3061431

Cited by 15 publications

(19 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The EM-circuit co-simulation method is a useful method and is commonly used to show accurate circuit characteristics and performances by considering the exact characteristics of RF active and passive devices, both parasitic components and coupling effects in the implementation based on electromagnetic wave analysis [17][18][19][20][21][22]. Figure 3 presents a layout design with a dimension of 87 × 94 mm 2 for EM-circuit co-simulation using Keysight ADS Momentum.…”

Section: Resultsmentioning

confidence: 99%

2.45 GHz Active Isolator based on asymmetric coupler

et al. 2021

View full text Add to dashboard Cite

An active isolator achieving both high isolation and low insertion loss at 2.45 GHz is proposed. The isolator is based on an asymmetric coupler and is designed to leverage the gain and reverse isolation of an amplifier and coupling coefficients between the input and output of the coupler. The insertion loss and isolation of the isolator are enhanced by using the coefficients, and the power level with optimal isolation can be determined for a target specification. The asymmetric coupler increases the power handling capability of the proposed isolator that has a low coupling coefficient and achieves highly efficient isolation with a high coupling coefficient. Electromagnetic-circuit co-simulation results show that the proposed isolator with operation stability has ≥ 40 dB isolation and < 1 dB insertion loss for input power between 0−8 dBm.

show abstract

Section: Resultsmentioning

confidence: 99%

2.45 GHz Active Isolator based on asymmetric coupler

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Furthermore, when passive BPFs are realized with IC-based resonators, they exhibit high levels of IL (IL ∼ 4.5-9.3 dB in [14], [15]). To reduce the size of the non-reciprocal devices and BPFs, two major miniaturization approaches have been investigated: i) the integration of the non-reciprocal components into a chip using MMIC, CMOS, SiGe, technologies [16], [17], [18], [19], [20], [21], [22], [23], [24], [25], [26], [27], [28], [29] and ii) the RF co-design of the non-reciprocal components with the BPFs with or without ferrite-based elements [31], [32], [33], [34], [35], [36], [37], [38], [39], [40], [41], [42], [43], [44].…”

Section: Introductionmentioning

confidence: 99%

“…The second miniaturization technique is based on the combination of the function of the isolator/circulator with the function of the BPF into a single device [31], [32], [33], [34], [35], [36], [37], [38], [39], [40], [41], [42], [43], [44]. Using this method, either the BPF or the isolator/circulator can be removed from the RF front-end.…”

Section: Introductionmentioning

confidence: 99%

MMIC GaAs Isolators and Quasi-Circulators With Co-Designed RF Filtering Functionality

Ashley

Psychogiou

2023

IEEE J. Microw.

View full text Add to dashboard Cite

This paper reports on the RF design and practical development of GaAs MMIC multi-functional RF isolators and quasi-circulators with embedded filtering functionality. They are based on cascaded arrays of non-reciprocal resonators (NRRs), passive resonators, and impedance inverters. A unique transistor-based architecture is used for the realization of the NRR that exhibits an one-pole type bandpass response in the forward direction and RF signal cancellation in the reversed one. By controlling the number and type of resonators within cascaded resonator arrays, different levels of gain, out-of-band selectivity and in-band isolation can be obtained. The operating principles of the multi-functional isolator/filtering and quasi-circulator/filtering concepts are presented through synthesized and linear circuit-simulated examples. Practical design aspects using a commercially available GaAs MMIC process are also discussed. For proofof-concept demonstration purposes, four prototypes were designed and experimentally validated at X-band. They include: i) a NRR, ii) a two-resonator based frequency selective isolator (FSI), iii) a five-resonator based FSI, and iv) a two-pole/two-TZ frequency selective quasi-circulator (FSQC).

show abstract

“…Recent years have witnessed the quick emergence of magnetless nonreciprocity [1,2] and the development of a wide variety of integrated, CMOS-compatible microwave devices such as circulators [3][4][5][6][7], isolators [8,9], and nonreciprocal filtering structures [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Time-modulated Patch Antennas with Tunable and Nonreciprocal Polarization Ellipticity

Do¹,

Zang²,

Melcón³

et al. 2022

Preprint

View full text Add to dashboard Cite

In this paper, we propose and demonstrate time-modulated patch antennas able to exhibit opposite polarization ellipticity when operated in transmission or reception, effectively leading to nonreciprocal polarization responses. To this purpose, we merge a patch antenna fed from four symmetrical sides with a low-frequency time-modulation scheme. This configuration exploits the photonic Aharonov Bohm effect to individually manipulate the phase of surface currents flowing along orthogonal directions on the antenna with the phase of the modulation signals. Experimental results at 2.2 GHz demonstrate high conversion efficiency in the time-modulation process (loss 3 dB), isolation levels over 40 dB in transmission/reception mode, and tunability to generate/receive electromagnetic waves with arbitrary polarization ellipticity. Our findings may enable exciting applications in full-duplex communications as well as in polarimetric radar, sensing and imaging systems.

show abstract

RF Co-Designed Bandpass Filters/Isolators Using Nonreciprocal Resonant Stages and Microwave Resonators

Cited by 15 publications

References 31 publications

2.45 GHz Active Isolator based on asymmetric coupler

2.45 GHz Active Isolator based on asymmetric coupler

MMIC GaAs Isolators and Quasi-Circulators With Co-Designed RF Filtering Functionality

Time-modulated Patch Antennas with Tunable and Nonreciprocal Polarization Ellipticity

Contact Info

Product

Resources

About