POLARIZATION-INDEPENDENT METAMATERIAL ABSORBER FOR SINGLE BAND AND MULTI-BAND FREQUENCY

2015 ◽  
Vol 77 (10) ◽  
Author(s):  
Osman Ayop ◽  
Mohamad Kamal A. Rahim ◽  
Noor Asniza Murad
Keyword(s):  
Ring Structure ◽  
Circular Ring ◽  
Unit Cell ◽  
Single Band ◽  
Frequency Separation ◽  
Dual Band ◽  
Band Frequency ◽  
Ring Shape ◽  
Polarization Independent ◽  
Multi Band

This paper presents the design and simulation of polarization-independent type of metamaterial absorbers (MMAbs) at X-band frequency. The advantage of polarization-independent MMAbs is it can absorbs incident electromagnetic (EM) wave in all polarization states. It can be achieved by applying circular ring shape in a unit cell of MMAbs because the shape is very symmetry. The simulation is done in a unit cell for each proposed MMAbs structures. The FR4 substrate is used for MMAbs structure designs. The designed MMAbs structures can be divided into two parts which is circular ring and modified circular ring. The characteristics of both structure are studied through simulation process using CST software. Parametric study is conducted to observe the effect of each parameters in unit cell on the absorbing magnitude and frequency. It is observed that circular ring structures can achieve high EM wave  absorbance for single band and multi band frequency. Since frequency separation distant limitation occurred, the modified circular ring structure is proposed by adding copper lines on the original circular ring structure. Thus, dual band frequency with close separation distant between two resonant frequencies is obtained as close as 1 GHz compared to the original dual band circular ring which is 2 GHz.

Design and fabrication of miniaturized tri-band frequency selective surface with polarization-independent and angularly stable response

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sayi Soundariya Sampath ◽  
Ramprabhu Sivasamy
Keyword(s):  
Resonance Frequency ◽  
Figure Of Merit ◽  
Close Agreement ◽  
Single Layer ◽  
Frequency Selective Surface ◽  
Unit Cell ◽  
Band Frequency ◽  
Tm Mode ◽  
Frequency Selective ◽  
Polarization Independent

Abstract A single-layer miniaturized tri-band frequency selective surface (FSS) for bandstop filtering applications has been proposed in this work. The metallic layer with four-branched meandered pattern connected in the center is engraved on a dielectric FR-4 substrate. The three stopbands operating at 2.6, 5.6, and 7.1 GHz provides −10 dB bandwidth of 437, 447, and 552 MHz respectively. The size of the unit cell is 0.067 λ∘ × 0.067 λ∘, where λ∘ is the wavelength of the first resonance frequency. As a figure of merit, the symmetric FSS structure provides the advantage of polarization independence. The proposed compact FSS structure exhibits a stable angular response up to 60° in TE and TM mode. Moreover, measurements obtained from the fabricated prototype are compared with the simulated results and are found to be in close agreement.

scholarly journals A Design A CRLH Antenna for MIMO Applications with Single and Dual Band

2021 ◽  
Author(s):  
Nada M. Khalil Al-Ani ◽  
Oras A. Shareef Al-Ani ◽  
Mahmood F. Mosleh ◽  
Read A. Abd-Alhameed
Keyword(s):  
Resonance Frequency ◽  
Single Band ◽  
Dual Band ◽  
Ground Structure ◽  
Band Frequency ◽  
Mimo Antenna ◽  
Resonance Frequencies

A design of MIMO antenna with four elements each one consists of two polarized ports is proposed in this research. The design of each elements based on ZORA which is applied to get the advantage of band frequency flexibility. The proposed MIMO antenna is operated as a single and dual band by adjusting a ground structure. The resonance frequency is 3.9 GHz for single band with bandwidth 1 GHz (3.4–4.4) GHz at -10 dB with −27 dB isolation. The resonance frequencies for dual band are 4.95 and 7 GHz with bandwidth 1.23 GHz (4.03–5.26) GHz and 410 MHz (6.88–7.29) GHz at −10 dB and less than −12 dB isolation for both bands. The obtained size of FR-4 PCB for single band is 77 × 150 mm2 while 82 × 150 mm2 for dual band which are suitable for future smartphone.  

Single / Dual-Band Frequency and Polarization Switching Using Frequency Selective Surfaces for Terahertz Applications

2021 ◽  
Author(s):  
Ahmed Mosaad Mabrouk ◽  
Ahmed Abd Elmoneam Ibrahim ◽  
Hesham Fathi Hamed
Keyword(s):  
Frequency Band ◽  
Unit Cell ◽  
Dual Band ◽  
Frequency Selective Surfaces ◽  
Polarization Conversion ◽  
Dipole Antennas ◽  
Band Frequency ◽  
Terahertz Band ◽  
Cell Element ◽  
Terahertz Applications

Abstract This paper presents reconfigurable frequency and polarization FSS-based with photoconductive switches in a single and dual-band operation for antenna applications at the terahertz band. The single band FSS unit-cell element exhibits frequency reconfigurability between 0.62 THz and 0.7 THz. It also converts the LP waves into CP over a frequency band ranging from 0.59 THz to 0.8 THz (30 % 3-dB BW). The dual-band FSS unit-cell element exhibits frequency reconfigurability between (0.42 THz and 1.03 THz) when the switches are turned ON and (0.51 THz and 0.865 THz) when the switches are turned OFF. Moreover, it exhibits polarization conversion over two bands from 0.46 THz to 0.56 THz (20% 3-dB B.W) and from 0.82 THz to 0.91 THz (12 % 3-dB B.W). The dual-band FSS unit-cell element is arranged in a 7 x 7 array and used as a reflector for two dipole antennas (A and B) operating at 0.82 THz and 0.5 THz, respectively. The same dual-band FSS-based surface enhances their gain to about 8.4 dBi and converts their polarization from LP to CP at 0.82 THz and 0.5 THz, respectively.

scholarly journals Miniaturized Angularly Stable Dual Band Frequency Selective Surface for K and Ka Band

2020 ◽  
pp. 100-103
Author(s):  
Singaram M ◽  
Krishna Kumar E ◽  
Chandraprasad V ◽  
Finney Daniel Shadrach ◽  
Gowthaman Manoharan
Keyword(s):  
Satellite Communication ◽  
Cell Structure ◽  
Single Layer ◽  
Frequency Selective Surface ◽  
Unit Cell ◽  
Dual Band ◽  
Angle Of Incidence ◽  
Band Frequency ◽  
Ka Band ◽  
Frequency Selective

A single layer novel compact frequency selective surface which is used in reflector antenna is designed and simulated. The proposed unit cell reflects electromagnetic waves in K and Ka band with maximum reflection occurring at 22.62 GHz and 35.44 GHz respectively. The designed FSS find its application in satellite communication. A crossed dipole structure in center and two-legged structure in corners with square loop in each quadrant makes the FSS unit cell structure. The FSS is designed with oblique incidence for transverse electric and transverse magnetic polarization with return loss 0.3 dB in 22.62 GHz and less than 0.5 dB in 35.44 GHz. The proposed work shows frequency independence against oblique angle of incidence. The simulated result from CST microwave studio is compared with other similar works.

scholarly journals Investigation of Meandered Antenna for WLAN Application

2020 ◽  
Author(s):  
Nivetha S B ◽  
Bhuvaneswari B
Keyword(s):  
Patch Antenna ◽  
Return Loss ◽  
Coplanar Waveguide ◽  
Substrate Material ◽  
Waveguide Structure ◽  
Single Band ◽  
Dual Band ◽  
Ground Structure ◽  
Band Frequency

In this paper patch antenna using coplanar waveguide structure is designed. The dimension of the antenna is 12x22mm. The substrate material used is FR4 with thickness of 1.6mm. The dual band frequency is obtained by creating slot in the patch. Four slot is created in the patch. The frequency obtained for proposeddesign is 2.5 and 5.00GHz. The gain obtained for proposed antenna is 2.8dBi. The return loss obtained for proposed design is -35db at 5GHz and -34dB at 2.5GHz frequency. The meander antenna with two arm is designed using normal ground structure. Single band resonance is obtained for meander antenna with two arm at the frequency of 5.7GHz. The coplanar waveguide structure is chosen for dual band resonance and reduction in size. The designed antenna is used for WLAN application.

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