2.4 GHz antenna array using vector modulator-based active phase shifters for beamforming

Huţu, Florin; Cordeau, David; Paillot, Jean‐Marie

doi:10.1049/iet-map.2010.0005

Cited by 13 publications

(12 citation statements)

References 28 publications

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“…LNA is used to amplify the received single from antenna. VM, known as quadrature or I/Q modulator (TI TRF370317), can adjust the amplitude and phase of the received RF signal by fading its I/Q channel amplitude [13]- [15]. Three two-to-one power combiners and a three-to-one power combiner cascade into a six-channel power combiner.…”

Section: Geometry Of Antenna and Rfpsmmentioning

confidence: 99%

A Wideband Dual-Polarized Antenna and its Array With Electrically Downtilt Function for 5G Sub-6 GHz Communication Applications

et al. 2020

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A wideband dual-polarized antenna is proposed for 4G and 5G communication applications. The antenna element consists of a pair of opened-loop dipoles for dual-polarization and its three inherent resonant modes are shifted closer to form a wide bandwidth. With additional U-shaped slots etched around the feed point, the input impedance of the antenna element is matched to 50 Ohm. The fabricated antenna element operates from 1.8 to 4.0 GHz, having 75.9% (VSWR ≤ 2) impedance bandwidth and high port-toport isolation (> 25 dB). It also achieves a 67±1 • beamwidth in H-plane and 68.7 ± 3.3 • in V-plane with 8.5 ± 1 dBi gain across the supported bands. By using six antenna elements and designing RF phase shifting module (RFPSM) based on vector modulators, a six-element dual-polarized array with electrically downtilt is also fabricated and measured, realizing a peak gain of 16.8 dBi, a similar beamwidth in H-plane as single antenna element and an electrically downtilt in V-plane from 0 • to 12 • which is preferred in communication applications. This antenna array could be used for future 5G communication and other applications. INDEX TERMS Wideband, dual-polarized, electrically downtilt, opened-loop dipoles, 5G.

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Section: Geometry Of Antenna and Rfpsmmentioning

confidence: 99%

A Wideband Dual-Polarized Antenna and its Array With Electrically Downtilt Function for 5G Sub-6 GHz Communication Applications

et al. 2020

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“…As a result, the input impedance of rectangular microstrip antenna is computed accurately; moreover the executing time is considerably reduced. From now on, the achieved model can be used in designing rectangular antennas, analyzing active microstrip antennas [18] and adaptive microstrip antennas [19]. This approach can be extended in analyzing rectangular microstrip antenna array including mutual coupling effects [5].…”

Section: Resultsmentioning

confidence: 99%

Qualitative Model of the Input Impedance of Rectangular Microstrip Antenna

Ostadzadeh¹

2015

Journal of Fuzzy Set Valued Analysis

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In this paper, a fuzzy-based approach is proposed so as to predict the input impedance of the rectangular microstrip antenna. In the proposed approach, at first, behavior of single microstrip antenna is represented as simple and unchanged membership functions, and the feed probe effect on the input impedance is then extracted as simple curves so that the input impedance of microstrip antenna in despite of other existing models is efficiently predicted.

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“…Traditionally, the VM can be divided into four main categories [6], [14], [15]: polar-based [16], phase oversampling [14], constant-Gm [15], and Cartesian-combining types [6]. Comparatively, the Cartesian-combining VM is more widely used [3], [17]- [21] due to the ease of implementation and manipulation, low cost and widespread commercial availability.…”

Section: Introductionmentioning

confidence: 99%

“…The control accuracy of the transmission amplitude and phase of the VM is of essential importance in many application scenarios. In phased array antennas and beamforming applications, the precision of the radiation pattern relies on the accuracy of the amplitude and phase of the RF signals [21], [22]. Meanwhile, the beamforming performance and the electrical steering performance of a phased array system depend mostly on the resolution of the controlled phase shift [23].…”

Section: Introductionmentioning

confidence: 99%

A Calibration Method Based on Transfer Function Extraction for Cartesian Vector Modulator

et al. 2020

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In this paper, a calibration approach based on transfer function extraction for the Cartesian vector modulator (VM) is presented. Three kinds of VM models-the ideal VM model, the frequencydependent VM model and the modified frequency-dependent VM model, are introduced in the proposed calibration approach. The calibration approach starts with an initialization of the transfer function of the modified frequency-dependent VM model. Then, the parameters of the transfer function are modified and extracted from the data of the measured transmission state (transmission amplitude and phase) of the actual VM by iteration, until the transmission state predicted by the extracted transfer function agrees well with the measured transmission state. Subsequently, the extracted transfer function of the modified frequencydependent VM model is capable of describing the transmission characteristics of the actual VM, and the calibrated baseband control voltages for the desired transmission amplitude and phase of the actual VM are able to be obtained by using the extracted transfer function. An actual VM is used as an example to verify this method. By adopting the proposed method, the maximum amplitude and phase errors at different complex gain setpoints are reduced to 0.05 dB and 0.3 • respectively after only two iteration steps. Since the actual VM is able to be accurately calibrated in only a few iteration steps, the results reveal that high accuracy and efficiency can be obtained in this calibration technique, which is well suited for applications involving high-accuracy calibration, real-time calibration and multichannel VM system calibration. INDEX TERMS Calibration, gain control, phase control, transfer function, vector modulator (VM).

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2.4 GHz antenna array using vector modulator-based active phase shifters for beamforming

Cited by 13 publications

References 28 publications

A Wideband Dual-Polarized Antenna and its Array With Electrically Downtilt Function for 5G Sub-6 GHz Communication Applications

A Wideband Dual-Polarized Antenna and its Array With Electrically Downtilt Function for 5G Sub-6 GHz Communication Applications

Qualitative Model of the Input Impedance of Rectangular Microstrip Antenna

A Calibration Method Based on Transfer Function Extraction for Cartesian Vector Modulator

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