Measured Performance of Broadband Frequency Selective Surface to Reduce Return Loss

2018 ◽  
Author(s):  
Tomihiro Ikegami ◽  
Shota Ino ◽  
Kunio Sakakibara ◽  
Nobuyoshi Kikuma
Keyword(s):  
Return Loss ◽  
Frequency Selective Surface ◽  
Frequency Selective ◽  
Broadband Frequency

An array of stagger-tuned printed dipoles as a broadband frequency selective surface

2002 ◽  
Vol 35 (2) ◽  
pp. 138-140 ◽  
Author(s):  
D. Sarkar ◽  
P. P. Sarkar ◽  
S. Das ◽  
S. K. Chowdhury
Keyword(s):  
Frequency Selective Surface ◽  
Frequency Selective ◽  
Broadband Frequency

scholarly journals Improvements of trapezoid antenna gain using artificial magnetic conductor and frequency selective surface

2020 ◽  
Vol 20 (1) ◽  
pp. 281
Author(s):  
Siti Adlina Md Ali ◽  
Maisarah Abu ◽  
Siti Normi Zabri
Keyword(s):  
Human Body ◽  
High Frequency ◽  
Return Loss ◽  
Performance Enhancement ◽  
Frequency Selective Surface ◽  
Antenna Gain ◽  
Magnetic Conductor ◽  
Artificial Magnetic Conductor ◽  
Directive Antenna ◽  
Frequency Selective

<span>This paper presents the performance enhancement of the trapezoid antenna with Artificial Magnetic Conductor (AMC) and Frequency Selective Surface (FSS). The antenna, AMC and FSS structures are printed on 0.254 mm of RT/Duroid 5880 high frequency laminate. The performances of the antenna with and without AMC and FSS were evaluated. Three cases are analyzed; antenna alone, antenna with AMC and antenna with AMC-FSS. The 2x3 arrays of AMC and AMC-FSS were positioned at the back of the antenna with 6 mm air gap. The antenna alone works at 12 GHz, and shifted to 12.35 GHz and 12.33 GHz for case 2 and case 3, respectively. Despite the shift in the resonance, the antenna is still operating well at 12 GHz with a return loss            –16.70 dB for case 2 and–16.84 dB for case 3. Case 3 effectively enhanced the antenna gain from 4.43 dB to 6.74 dB and contributed to a directive antenna. Moreover, case 3 also successfully reduced the radiation of the antenna that penetrates into human body as the antenna is applied for on-body applications. </span>

scholarly journals Improvement of Inset Fed Microstrip Antenna’s Pefromances with Types of Metamaterials at 28 GHz

2019 ◽  
Vol 8 (2S6) ◽  
pp. 820-825 ◽  
Keyword(s):  
Microstrip Antenna ◽  
Return Loss ◽  
Frequency Selective Surface ◽  
Magnetic Conductor ◽  
Artificial Magnetic Conductor ◽  
Frequency Selective ◽  
Flexible Applications

This paper presents improvement of insert feed microstrip antenna with types of types of metamaterials. The antenna and the metamatrials were printed on a thin substrate, Rogers RT5880 with 0.254 mm thickness. Two types of metamaterials were introduced; Artificial Magnetic Conductor (AMC) and Frequency Selective Surface (FSS). The metamaterials were placed on the bottom of the antenna with no gap. Four cases were analyzed; antenna alone, antenna with AMC, antenna with FSS and antenna with multi-layer of FSS-AMC. Performances of the antenna were evaluated in terms of return loss, useful bandwidth and realized gain. The resonating frequency was shifted but still operate well at 28 GHz. Improvements in useful bandwidth from antenna alone and as it worked with all types of metamaterials. The realized gain was effectively improved from 1.76 dB up to 6.16 dB for the fourth cases. The design of insert feed microstrip antenna with types of thin metamaterials can be applied as a flexible applications in advanced sensors.

scholarly journals PERFORMANCE IMPROVED TRIANGULAR MULTI BAND ANTENNA USING REACTIVE IMPEDANCE SUBSTRATE AND FREQUENCY SELECTIVE SURFACE

2021 ◽  
Vol 9 (1) ◽  
pp. 486-492
Author(s):  
K. Mahendran, Dr. R. Gayathri
Keyword(s):  
Patch Antenna ◽  
Return Loss ◽  
Frequency Selective Surface ◽  
Modern World ◽  
Multiband Antennas ◽  
World Communication ◽  
Communication Devices ◽  
Frequency Selective ◽  
The One ◽  
Multi Band

In modern world, communication devices need to be operated for more than one frequency bands. Lot of research works were carried out in the field of multiband antennas. The one major concern in the design of multiband patch antenna are the gain and bandwidth. Both gain and bandwidth of the multi band antenna can be improved for the better performance. In this paper a triangular multiband antenna is designed and the gain of the antenna is enhanced by the blend of reactive impedance surface and Frequency selective surface. The proposed antenna resonates 3.4 GHz, 4.2 GHz, 6.75 GHz,7.1 GHz, 7.5 GHz and 9.3 GHz with a better return loss and gain.

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