Slit-Slot Line and Its Application to Low Cross-Polarization Slot Antenna and Mutual-Coupling Suppressed Tripolarized MIMO Antenna

2019 ◽  
Vol 67 (1) ◽  
pp. 4-15 ◽  
Author(s):  
Leilei Liu ◽  
Chao Liu ◽  
Ziyang Li ◽  
Xiaoxing Yin ◽  
Zhi Ning Chen
Keyword(s):  
Mutual Coupling ◽  
Slot Antenna ◽  
Cross Polarization ◽  
Mimo Antenna ◽  
Slot Line

scholarly journals Design of Ultra-Wideband MIMO Antenna for Breast Tumor Detection

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Liting Wang ◽  
Bin Huang
Keyword(s):  
Cancer Detection ◽  
Breast Tumor ◽  
Mutual Coupling ◽  
Microstrip Line ◽  
Breast Cancer Detection ◽  
Imaging Systems ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Mimo Antenna ◽  
Measurement Results

A MIMO antenna composed by microstrip line-fed circular slot antenna is proposed. This antenna is used in ultra-wideband microwave imaging systems aimed for early breast cancer detection. The antenna is designed to operate across the ultra-wideband frequency band in the air. The mutual coupling between the antenna elements has been investigated to be low enough for MIMO medical imaging applications. Both the simulation and measurement results are shown to illustrate the performances of the proposed antenna.

scholarly journals Electromagnetic Soft Surface (EMSS) Integrated MIMO Antennas With Reduced Mutual Coupling And Cross-Polarization Radiation

2021 ◽  
Author(s):  
Swati Bhattacharjee ◽  
Santimoy Mandal ◽  
Chandan Kumar Ghosh
Keyword(s):  
Microstrip Antenna ◽  
Mutual Coupling ◽  
Return Loss ◽  
Satellite Communication ◽  
Antenna System ◽  
Cross Polarization ◽  
Mimo Antenna ◽  
Mimo Antennas ◽  
At Resonance ◽  
Soft Surface

Abstract For closely spaced microstrip antenna elements, Mutual Coupling (MC) is an inevitable phenomenon which degrades antenna performances like gain, radiation pattern, return loss, radiation efficiency etc. Lot of works have been done on the reduction of MC and published the results in the open literatures. This paper presents an approach to suppress MC between two closely spaced microstrip radiators. This is achieved by inserting properly designed EMSS structure between the radiating elements. This EMSS acts as an electrical wall between two rectangular patches and reduces mutual coupling up to 50 dB at resonance frequency of 4.35 GHz. In this attempt, Cross Polarization (XP) reduction of 12.5dB has also been achieved with a gain 5.40dBi for the proposed antenna. The centre to centre spacing between the antenna elements is taken as 22.1mm (0.32λ).The proposed MIMO antenna system can be used for satellite communication and radar system.

Compact modified circular patch quad-band MIMO antenna with high isolation and low correlation

2016 ◽  
Vol 9 (3) ◽  
pp. 581-590
Author(s):  
Chithradevi Rajagopal ◽  
Nafiza Noorullakhan ◽  
Sreeja Balakrishnapillai Suseela ◽  
Radha Sankararajan
Keyword(s):  
Mutual Coupling ◽  
Local Area Network ◽  
Diversity Gain ◽  
Slot Antenna ◽  
Antenna Element ◽  
Area Network ◽  
Mimo Antenna ◽  
High Isolation ◽  
Circular Patch ◽  
Low Correlation

A compact quad band slot antenna with high isolation suitable for multiple-input–multiple-output (MIMO) applications is developed. The quad bands are achieved by introducing slots in a modified, size reduced circular patch antenna. The single-antenna element consists of a substrate sandwiched between a modified circular patch with F shape slot, a feeder line and a via running between the radiating patch and the feeder line. The proposed design resonates at the frequencies of 1.8 GHz (1.7–1.88 GHz), 3.6 GHz (3.50–3.76 GHz), 5.4 GHz (5.25–5.38 GHz), and 7.2 GHz (7.15–7.35 GHz) covering the GSM II, WIMAX, wireless local area network (WLAN), and C-band applications, respectively. The independent tuning of frequency bands is achieved by varying the length of the slots. Orthogonally placed two- and four-element MIMO antenna system are fabricated, tested, and the measurement results are presented. The separation between each element is reduced to 0.085λ while introducing slotted and pulsed stubs to improve isolation between elements. A detailed analysis, including mutual coupling, low correlation, diversity gain, and total array reflection coefficient had been reported. The two- and four-element MIMO antennas achieved correlation as low as 0.005, mutual coupling ≤−15 dB, and diversity gain nearly 10 dB.

A printed multiband MIMO antenna with decoupling element

2019 ◽  
Vol 11 (4) ◽  
pp. 413-419 ◽  
Author(s):  
Ziyu Xu ◽  
Qisheng Zhang ◽  
Linyan Guo
Keyword(s):  
Mutual Coupling ◽  
Surface Current ◽  
Antenna System ◽  
Antenna Element ◽  
Coupling Mechanism ◽  
Mimo Antenna ◽  
Resonant Modes ◽  
Monopole Antennas ◽  
Input Multiple Output ◽  
Ground Plate

AbstractA printed multiband Multi-Input Multiple-Output (MIMO) antenna is proposed in this paper. This MIMO antenna system comprises two symmetric printed monopole antennas. Each antenna element consists of multiple bend lines, producing four resonant modes and covering the GSM900, PCS, LTE2300, and 5G bands. Simulated and measured results prove that the proposed MIMO antenna can be applied to traditional 2G, 3G, 4G, and present 5G mobile communication. By etching four inverted L-shaped grooves on its ground plate, mutual coupling between the adjacent antenna elements has been suppressed. This makes the |S21| at all four resonant modes is lower than −40 dB. In addition, its low coupling mechanism has been analyzed by surface current distribution. The designed multiband MIMO antenna provides an idea of reference to realize low mutual coupling between antenna elements, which is also realizable in infrared or optical regimes with appropriate designs.

Sign in / Sign up

Export Citation Format

Share Document