Low-Profile and High-Passband Roll-Off Frequency-Selective Structure Using Bent Waveguides

2020 ◽  
Vol 19 (12) ◽  
pp. 2117-2121
Author(s):  
Guo-Wen Chen ◽  
Sai-Wai Wong ◽  
Yin Li ◽  
Zai-Cheng Guo ◽  
Long Zhang ◽  
...  
Keyword(s):  
Low Profile ◽  
Frequency Selective ◽  
Bent Waveguides

Low-profile and Dual-polarization Water-based Frequency Selective Rasorber with Ultra-wideband Absorption

2021 ◽  
pp. 1-1
Author(s):  
Xiangkun Kong ◽  
Lingqi Kong ◽  
Shunliu Jiang ◽  
Xuemeng Wang ◽  
Yukun Zou ◽  
...  
Keyword(s):  
Ultra Wideband ◽  
Dual Polarization ◽  
Low Profile ◽  
Water Based ◽  
Frequency Selective

Miniaturized frequency selective surface with high angular stability

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Zain Ul Abidin ◽  
Qunsheng Cao ◽  
Gulab Shah ◽  
Zaheer Ahmed Dayo ◽  
Muhammad Ejaz
Keyword(s):  
Resonant Frequency ◽  
Electric Field Distribution ◽  
Equivalent Circuit Model ◽  
Surface Current ◽  
Frequency Selective Surface ◽  
Angular Stability ◽  
Working Mechanism ◽  
Low Profile ◽  
Simple Geometry ◽  
Frequency Selective

Abstract In this paper, a miniaturized bandstop frequency selective surface (FSS) with high angular stability is presented. Each FSS element consists of four sets each consisting eight octagonal concentric interconnected loops. The four sets are connected with each other through outermost octagonal loop. The unit size is miniaturized to 0.066 λ0 at the resonant frequency of 1.79 GHz. The proposed configuration achieves excellent angular stability (only 0.025 GHz resonant frequency deviation is observed upto 83° oblique angles). The working mechanism of FSS is explained with the help of equivalent circuit model (ECM), electric field distribution, and corresponding surface current distribution. A prototype of the designed bandstop FSS is fabricated to verify the simulated frequency response. The experimental results are consistent with the simulation results. Simple geometry, low profile, high angular stability, and compact cell size are prominent features of the proposed structure.

A Low-Profile Third-Order Bandpass Frequency Selective Surface

2009 ◽  
Vol 57 (2) ◽  
pp. 460-466 ◽  
Author(s):  
Nader Behdad ◽  
Mudar Al-Joumayly ◽  
Mohsen Salehi
Keyword(s):  
Frequency Selective Surface ◽  
Third Order ◽  
Low Profile ◽  
Frequency Selective

scholarly journals A Novel 2.4-GHz Low-Profile Smart MIMO Antenna with Reconfigurable Frequency-Selective Reflectors

2020 ◽  
Vol 9 (2) ◽  
pp. 42-51
Author(s):  
C.-H. Tsai ◽  
J.-S. Sun ◽  
S.-J. Chung ◽  
J.-H. Tarng
Keyword(s):  
Multiple Input Multiple Output ◽  
Antenna System ◽  
Switching Network ◽  
Ieee 802.11A ◽  
Mimo Antenna ◽  
Low Profile ◽  
Specific Direction ◽  
Input Multiple Output ◽  
Frequency Selective ◽  
Beam Switching

In this paper, a new low-profile smart multiple-input multiple-output (MIMO) antenna system is presented for WiFi IEEE 802.11a/b/g/n/ac/ax applications. The proposed compact 2.4-GHz antenna system employs two beam-switching antenna cells for MIMO operation. Each antenna cell is composed of four reconfigurable frequency-selective reflectors (RFSRs) and a one-to-four switching feeding network. The RFSRs are constructed using a one-wavelength metal loop resonator, which functions as a radiating antenna or a wave reflector to reflect beams along a specific direction, as controlled by the switching network. The feeding switching network utilizes PIN diodes to adjust the phase and impedance required for changing the operational status of each RFSR. The overall dimensions of the antenna system, including the metallic ground, are 120 mm ´ 120 mm ´ 9.5 mm. Moreover, the measured operational bandwidth of the 2.4-GHz antenna is approximately 100 MHz, and the radiation efficiency of each directed beam is 40%–70%.

scholarly journals X-band Band-pass Frequency Selective Surface for Radome Applications

2015 ◽  
Vol 16 (2) ◽  
pp. 281
Author(s):  
Tariq Rahim ◽  
Jiodong Xu
Keyword(s):  
Frequency Selective Surface ◽  
Unit Cell ◽  
Dielectric Substrates ◽  
Low Profile ◽  
X Band ◽  
Analysis And Synthesis ◽  
Unit Cells ◽  
Band Pass ◽  
Frequency Selective ◽  
Unit Cell Dimensions

A low profile multi layer miniaturized unit cell frequency selective surface (FSS) with second-order band-pass response is design. The metallic layers in the form of capacitive patches and inductive grids are separated by dielectric substrates. The non-resonant sub-wavelength unit cells with unit cell dimensions and periodicities on the order of 0.15λ. The overall thickness of approximately 0.03λ is designed which is useful at lower frequencies with long wavelengths. The FSS exhibit a stable frequency response to different angles of incidence and polarizations. The analysis and synthesis of the FSS is done using equivalent circuit method and simulated using CST microwave studio at X-band.

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