Compact four-element MIMO SIW cavity backed slot antenna with high front-to-back ratio

Self Cite

A novel design of dual‐frequency dual‐sense circularly polarized (CP) substrate integrated waveguide (SIW) cavity‐backed slot antenna is presented for dual‐band wireless communication systems. The proposed antenna consists of square SIW cavity, asymmetrical bow‐tie‐shaped cross slot and probe feed. Due to use of asymmetrical bow‐tie‐shaped cross slot, circularly polarized wave radiates at two different frequencies with opposite sense of polarizations. The RHCP radiation occurs at (10.45‐10.54) GHz (Lower band) and LHCP occurs at (11.26‐11.34) GHz (Upper band). Moreover, in each band, sense of polarization can be change by changing the feed position. The front to back radiation ratio (FTBRR) is more than 10.5 dB and cross polarization level is lower than −20 dB in both the bands.

Section: Antenna Design and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Substrate integrated waveguide dual‐frequency dual‐sense circularly polarized cavity‐backed slot antenna

Priya

Kumar

Dwari

2019

Self Cite

“…A cavity backed slotted MIMO antenna on a square substrate of 62 × 62 mm 2 is reported that covers the 5.9 GHz frequency band with 8 dB gain in Ref. . In Ref.…”

Section: Introductionmentioning

confidence: 99%

Compact dual wide‐band four/eight elements MIMO antenna for WLAN applications

Roy

Ghosh

Chakarborty

2019

A compact four and eight elements multiple-input-multiple-output (MIMO) antenna designed for WLAN applications is presented in this article. The antenna operates in IEEE 802.11b/g WLAN (2.4 GHz), IEEE 802.11 ac/n WLAN (5.2 and 5.8 GHz) and WiMAX (5.8 GHz) bands. The resonated mode of the antenna is achieved by two unequal Reverse-L shaped, line-shaped slots on top and parasitic element on the ground layer. The single antenna provides wide bandwidth of about 29% (2.3-3.1 GHz) in lower and 22% (4.9-6.1 GHz) in the upper band. The compactness of the single element antenna is found about 95% with respect to the patch and 61% in overall dimension. Thereafter an investigation is carried out to design two, four, and eight elements MIMO antennas. All of the multi-element structures provide compact configuration and cover entire WLAN frequency ranges . The dimension of the proposed eight element MIMO antenna is 102 × 52 × 1.6 mm 3 . It covers the frequency (measured) from 2.4 to 3.1 GHz and 5 to 6.1 GHz. The diversity performance of the proposed MIMO antenna is also assessed in terms of the envelope correlation coefficient (ECC), diversity gain (DG), and total active reflection co-efficient (TARC). The ECC is found <0.5 whereas the DG >9.0 is obtained for the desired bands. K E Y W O R D S broadband antenna, compact antenna, dual band MIMO, eight element MIMO, four element MIMO

“…Until now, a variety of decoupling methods such as usage of polarization / pattern diversity, optimization of antenna configuration, utilization of isolating elements, and introduction of decoupling networks have been proposed to improve the isolation among antenna elements. However, these techniques will lead to high profile, large overall size, complex structure, and low radiation efficiency .…”

Section: Introductionmentioning

confidence: 99%

Compact tri‐band MIMO antenna based on quarter‐mode slotted substrate‐integrated‐waveguide cavity

Niu

Tan

2019

A compact tri-band multiple-input-multiple-output (MIMO) antenna based on a quarter-mode slotted substrate-integrated-waveguide (SIW) cavity is proposed. By etching a wide slot, a single SIW cavity is divided into two subcavities with the same size. They are fed by coaxial ports to form two MIMO elements and high antenna isolation can be achieved by this slot. To obtain multi-band operations, two narrow slots are cut in the upper sub-cavity and the other two slots are etched in the lower sub-cavity. Three eighth-mode resonances with different areas can simultaneously occur in these antenna elements. A prototype with the overall size of 0.34λ 0 × 0.34λ 0 has been fabricated. The measured center frequencies of three operating bands are 2.31, 2.91, and 3.35 GHz, respectively. The measured gain at above frequencies is 4.52, 4.29, and 4.57 dBi, respectively. Moreover, the measured isolation is higher than 16.7 dB within the frequency of interest. K E Y W O R D Shigh isolation, MIMO antenna, quarter-mode, substrate integrated waveguide (SIW) cavity, tri-band operation