Implementation of Spatial/Polarization Diversity for Improved-Performance Circularly Polarized Multiple-Input-Multiple-Output Ultra-Wideband Antenna

Abstract The design, analysis, fabrication, and testing of a four-port multiple-input multiple-output (MIMO) antenna is reported in this paper for automotive communications. The MIMO antenna is constructed using the basic antenna element exploiting a slot geometry. Two such antennas are developed on the same microwave laminate to develop a two-port MIMO antenna. Two such microwave laminates are interlocked to create the four-port MIMO scheme. The most distinct feature of the proposed architecture is that the inter-port isolation is well-taken care without the need for an external decoupling unit. The four-port MIMO antenna has an overall volume of 32 × 15 × 32 mm3. The prototype MIMO antenna is fabricated and the measurements are carried out to validate the simulation results. The antenna offers ultra-wideband (UWB) characteristics covering the frequency range of 2.8–9.5 GHz. The average boresight gain of the antenna ranges from 3.2 to 5.41 dBi with the peak gain at 8 GHz. The simulated efficiency of the antenna is greater than 73% within the operating bandwidth. The MIMO parameters such as envelope correlation coefficient, diversity gain, and mean effective gain are evaluated and presented. The appropriateness of the proposed antenna for deployment in the shark fin housing of the present-day automobiles is verified using on-car performance estimation.

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Compact Dual-Band Circularly Polarized Stacked Patch Antenna for Microwave-Radio-Frequency Identification Multiple-Input-Multiple-Output Application

International Journal of Antennas and Propagation ◽

10.1155/2021/9991748 ◽

2021 ◽

Vol 2021 ◽

pp. 1-13

Author(s):

Enze Zhang ◽

Andrea Michel ◽

Paolo Nepa ◽

Jinghui Qiu

Keyword(s):

Radio Frequency ◽

Radio Frequency Identification ◽

Patch Antenna ◽

Multiple Input Multiple Output ◽

Dual Band ◽

Circularly Polarized ◽

Multiple Input ◽

Input Multiple Output ◽

Frequency Identification ◽

Stacked Patch Antenna

A compact, low-profile, two-port dual-band circularly polarized (CP) stacked patch antenna for radio-frequency identification (RFID) multiple-input-multiple-output (MIMO) readers is proposed, which employs the shared-aperture technique. The proposed antenna adopts a 1.524 mm thickness Rogers Ro4350b substrate with relative permittivity of 3.48. Two pairs of isolated ports are working at two microwave- (MW-) RFID bands (2.4–2.485 GHz and 5.725–5.875 GHz) with high port isolation of 25 dB and 30 dB, respectively. A shared metal slot layer is designed to separate two feeding structures of the lower band and upper band for port isolation enhancement as well as saving space. Corner-truncated square slot and patch configurations have been designed to obtain CP modes. In the lower and upper MW-RFID bands, the relative impedance bandwidths are 12.2% and 5.7%, and the maximum realized gains are higher than 7.3 dBic. Moreover, two-element configurations have been combined for an RFID MIMO system that occupies a dimension of 119 mm × 119 mm × 12.9 mm. The MIMO antenna performance of envelope correlation coefficient (ECC) is lower than 0.03, and diversity gain is close to 10 dB.

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A compact printed ultra‐wideband multiple‐input multiple‐output prototype with band‐notch ability for WiMAX, LTEband43, and WLAN systems

International Journal of RF and Microwave Computer-Aided Engineering ◽

10.1002/mmce.21673 ◽

2019 ◽

Vol 29 (6) ◽

pp. e21673 ◽

Cited By ~ 5

Author(s):

Sonika Priyadarsini Biswal ◽

Sushrut Das

Keyword(s):

Multiple Input Multiple Output ◽

Ultra Wideband ◽

Multiple Input ◽

Input Multiple Output

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A Three-Dimensional Enhanced Imaging Method on Human Body for Ultra-Wideband Multiple-Input Multiple-Output Radar

Electronics ◽

10.3390/electronics7070101 ◽

2018 ◽

Vol 7 (7) ◽

pp. 101 ◽

Cited By ~ 4

Author(s):

Dizhi Zhao ◽

Tian Jin ◽

Yongpeng Dai ◽

Yongping Song ◽

Xiangchenyang Su

Keyword(s):

Human Body ◽

Multiple Input Multiple Output ◽

Three Dimensional ◽

Ultra Wideband ◽

Imaging Method ◽

Multiple Input ◽

Input Multiple Output ◽

Enhanced Imaging

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Compact four-port vertically polarized UWB monopole antenna for MIMO communications

Circuit World ◽

10.1108/cw-04-2020-0055 ◽

2020 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Premalatha J. ◽

Sheela D.

Keyword(s):

Antenna Array ◽

Performance Metrics ◽

Multiple Input Multiple Output ◽

Unit Cell ◽

Ultra Wideband ◽

Mimo Communications ◽

Content Type ◽

Directional Radiation ◽

Multiple Input ◽

Input Multiple Output

Purpose This paper aims to present the design of a compact vertically polarized four-element UWB antenna suitable for MIMO communications. Design/methodology/approach The unit cell antenna is constructed using a square ring radiator excited through a stepped impedance feed. The proposed antenna covers the Ultra-wideband (UWB) spectrum ranging from 2.2 to 12.3 GHz. The isolation between the unit cell antennas in the array is enhanced using a simple microstrip line resonator. The decoupling element is connected to the ground through a via. Findings The proposed scheme offers at least 16 dB improvement in the port-to-port coupling. Furthermore, the four-element antenna array is constructed using a specific interlocking scheme. The proposed antenna array’s Multiple Input Multiple Output (MIMO) performance metrics are analyzed. Originality/value By suitably selecting the excitation port, directional radiation patterns can be realized. The combined radiation pattern covers 360 degrees. A prototype antenna array is fabricated, and the simulation results are verified using real-time experiments. The proposed antenna is a suitable candidate for shark fin housing in automotive communications.

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