Reconfigurable bandstop filter using active frequency selective surface, design and fabrication

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Hamed Babaei ◽  
Seyyed Amir Gohari
Keyword(s):  
Resonant Frequency ◽  
Band Gap ◽  
Frequency Selective Surface ◽  
Pin Diodes ◽  
Frequency Shifts ◽  
Surface Design ◽  
Turn On ◽  
Measurement Results ◽  
Bandstop Filter ◽  
Good Agreement

Abstract In this paper a novel FSS array is proposed, that provides dynamic band-gap in C-band. Inside the band-gap, the FSS acts as a bandstop filter. Outside the band-gap the amplitude of the reflected wave from the FSS array decreases. Therefore, the outside band is very useful in radar cross section (RCS) reduction. In this paper, at first a new FSS unit cell is designed, then in order to achieve the maximum bandwidth (1.2 GHz), dimensions of the cell are optimized. In the next step, the FSS cell is equipped with PIN diodes. Turning the diodes ON or OFF, shifts the resonant frequency of the band-gap electronically. When diodes are OFF, the resonant frequency and −10 dB bandwidth of the FSS are 5.23 and 0.9 GHz respectively. When the diodes turn ON, the resonant frequency shifts to 4.75 GHz over a bandwidth of about 1 GHz. While the band-gap is shifted dynamically, the bandwidth is kept wide, which is the novelty of this paper. In order to validate the design process, an array of active cells consisting of 128 pin diodes was designed, fabricated and then tested. Finally, the simulation and measurement results are compared with each other and a good agreement is observed between them.

Novel Dual-Band Miniaturized Frequency Selective Surface based on Fractal Structures

Frequenz ◽  
2017 ◽  
Vol 71 (1-2) ◽  
pp. 57-63 ◽  
Author(s):  
Tao Zhong ◽  
Hou Zhang ◽  
Rui Wu ◽  
Xueliang Min
Keyword(s):  
Resonant Frequency ◽  
Free Space ◽  
Single Layer ◽  
Frequency Selective Surface ◽  
Anechoic Chamber ◽  
Dual Band ◽  
Fractal Structures ◽  
Frequency Selective ◽  
Good Agreement

Abstract A novel single-layer dual-band miniaturized frequency selective surface (FSS) based on fractal structures is proposed and analyzed in this paper. A prototype with enough dimensions is fabricated and measured in anechoic chamber, and the measured results provide good agreement with the simulated. The simulations and measurements indicate that the dual-band FSS with bandstop selectivity center at 3.95 GHz and 7.10 GHz, and the whole dimension of the proposed FSS cell is only 7×7 mm2, amount to 0.092λ0×0.092λ0, that λ0 is free space wavelength at first resonant frequency. In addition, the center frequencies have scarcely any changes for different polarizations and incidences. What’s more, dual-band mechanism is analyzed clearly and it provides a new way to design novel miniaturized FSS structures.

An Accurate Method of Adjusting the Resonant Frequency of Defected Microstrip Structure

2012 ◽  
Vol 588-589 ◽  
pp. 125-128
Author(s):  
Dan Cheng ◽  
Hong Cheng Yin ◽  
Hong Xing Zheng
Keyword(s):  
Resonant Frequency ◽  
Microstrip Line ◽  
Accurate Method ◽  
Property A ◽  
Rejection Level ◽  
Measurement Results ◽  
Lower Insertion Loss ◽  
Line Network ◽  
Microstrip Structure ◽  
Good Agreement

An adjustable defected microstrip structure is discussed in detail in this paper. To obtain a better bandstop property, a simple U-shaped slot is etched in the center of microstrip line, the lower insertion loss in the passband and higher rejection level has been exhibited. The resonant frequency is extracted using transmission line network analysis. At the same time, an accurate method of adjusting the resonant frequency is proposed to match the designed resonant frequency exactly. A fabricated sample has been tested to verify the design. Measurement results are in very good agreement with simulations.

scholarly journals Compact, Frequency Reconfigurable, Printed Monopole Antenna

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Ricardo Gonçalves ◽  
Pedro Pinho ◽  
Nuno B. Carvalho
Keyword(s):  
Resonant Frequency ◽  
Active Form ◽  
Monopole Antenna ◽  
Pin Diodes ◽  
Impedance Response ◽  
Printed Monopole Antenna ◽  
Printed Monopole ◽  
Simulation Results ◽  
Good Agreement

This paper proposes a possible implementation of a compact printed monopole antenna, useful to operate in UMTS and WLAN bands. In order to accomplish that, a miniaturization technique based on the application of chip inductors is used in conjunction with frequency reconfiguration capability. The chip inductors change the impedance response of the monopole, allowing to reduce the resonant frequency. In order to be able to operate the antenna in these two different frequencies, an antenna reconfiguration technique based on PIN diodes is applied. This procedure allows the change of the active form of the antenna leading to a shift in the resonant frequency. The prototype measurements show good agreement with the simulation results.

scholarly journals Bandpass Filter Based on Spoof Surface Plasmon Polaritons With a Switchable High-Selectivity Notch Band

2021 ◽  
Vol 9 ◽  
Author(s):  
Longfei Tan ◽  
Qiangji Wang ◽  
Ying-Jiang Guo ◽  
Jianlei Cui ◽  
Kai-Da Xu
Keyword(s):  
Surface Plasmon ◽  
High Selectivity ◽  
Bandpass Filter ◽  
Pin Diodes ◽  
Notch Band ◽  
Half Wavelength ◽  
Measurement Results ◽  
Two Sides ◽  
Plasmon Polaritons ◽  
Good Agreement

A substrate integrated waveguide (SIW) based spoof surface plasmon polariton (SSPP) is proposed for the design of bandpass filter (BPF). The left and right edge cutoff frequencies of the passband can be easily adjusted by changing the parameters of SIW and ring slot embedded into the SIW. Then, four half-wavelength circular slots are added on two sides of the SSPP located at the center of the circuit to introduce a high-selectivity notch band. In order to make the notch band switchable, four full-wavelength circular slots and four PIN diodes are applied instead of the four half-wavelength circular slots. As the PIN diodes are under the ON state, the notch band will be generated within the passband of BPF. On the contrary, as the PIN diodes are under the OFF state, the notch band will disappear. To validate the design idea, two BPF examples are fabricated and measured, whose simulation and measurement results are both in reasonably good agreement.

scholarly journals Design of a PIN Diode-Based Reconfigurable Metasurface Antenna for Beam Switching Applications

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Sarawuth Chaimool ◽  
Tanan Hongnara ◽  
Chawalit Rakluea ◽  
Prayoot Akkaraekthalin ◽  
Yan Zhao
Keyword(s):  
Wave Propagation ◽  
Operating Frequency ◽  
Pin Diode ◽  
Pin Diodes ◽  
Measurement Results ◽  
Dual Operations ◽  
Beam Switching ◽  
Incident Waves ◽  
Good Agreement

In this paper, we propose a reconfigurable metasurface antenna for beam switching applications. The reconfigurable metasurface is formed by uniformly distributed double-split square rings loaded with positive-intrinsic-negative (PIN) diodes for dual operations of a wave reflector and a wave director. Specifically, when the PIN diodes are forward biased, an epsilon-negative (ENG) metasurface is realized which reflects all incident waves with appropriate polarization; when the diodes are reverse biased, at the same operating frequency, a mu-near-zero (MNZ) metasurface is acquired which directs wave propagation. For excitation, a dipole radiator loaded with the same type of PIN diode is designed. Simulation and measurement results show good agreement and verify the beam switching functionality of the proposed metasurface antenna.

scholarly journals A novel tri-band reconfigurable microstrip patch antenna

Frequenz ◽  
2020 ◽  
Vol 74 (7-8) ◽  
pp. 247-253
Author(s):  
Wen Tao Li ◽  
Meng Wei ◽  
Bahareh Badamchi ◽  
Harish Subbaraman ◽  
Xiaowei Shi
Keyword(s):  
Patch Antenna ◽  
Simple Structure ◽  
Microstrip Patch Antenna ◽  
Pin Diodes ◽  
Microstrip Patch ◽  
X Band ◽  
Measurement Results ◽  
Simulation Results ◽  
Good Agreement ◽  
Ku Band

AbstractIn this paper, a novel tri-band reconfigurable patch antenna with simple structure is presented. By changing the on-off state of only two PIN diodes, the antenna can operate in three bands, namely X-band, Ku-band, and Ka-band. The overall size of the antenna is 0.24λL × 0.5λL × 0.019λL, where λL is the free-space wavelength of the lowest operating frequency. A prototype is fabricated and measured to verify the design. The measurement results are in good agreement with the simulation results, which indicate that the proposed antenna can be flexibly switched between three bands of 10.9–11.18 GHz, 15.65–15.9 GHz, and 32.3–33.6 GHz with stable radiation patterns.

Split-ring resonator-based compact microstrip antenna

2019 ◽  
Vol 33 (04) ◽  
pp. 1950043
Author(s):  
Linpeng Li ◽  
Shengze Ye ◽  
Jianchun Xu ◽  
Yanan Hao ◽  
Limin Guo ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
Microstrip Antenna ◽  
Ring Resonator ◽  
Split Ring Resonator ◽  
Microstrip Antennas ◽  
Split Ring ◽  
Influencing Mechanism ◽  
Low Profile ◽  
Measurement Results ◽  
Good Agreement

Compact microstrip antennas based on split-ring resonator (SRR) structure are proposed and fabricated in this paper. The resonant frequency of the antennas is discussed upon different geometric structures. The influencing mechanism of the antenna parameters on resonant frequency is analyzed. The analytical and experimental analyses are carried out and proved that the resonant frequency can be controlled from 13.5 GHz to 17.2 GHz by tuning some of the crucial parameters. A good agreement between the simulations and the measurement results suggests that the proposed antenna can be designed at different resonant frequencies while maintaining a small-size, low-profile structure and good performance.

scholarly journals Design of Miniaturized and Polarization-Insensitive Double-Layer Frequency Selective Surface Based on Meander Lines

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Feifei Huo ◽  
Fei Liu ◽  
Min Zhu ◽  
Jianhui Bao
Keyword(s):  
Resonant Frequency ◽  
Frequency Shift ◽  
Incident Angle ◽  
Frequency Selective Surface ◽  
Measurement Results ◽  
Polarization Insensitive ◽  
Spiral Shape ◽  
Simulation Results ◽  
Frequency Selective ◽  
Meander Lines

The work presented in this paper concerns a method for the miniaturized frequency selective surface (FSS) based on the meander lines. A miniaturized dual-bandstop FSS structure based on meander lines with spiral-shape is proposed and simulated. The equivalent circuit and current distributions are introduced to explain the FSS performance. The size of the unit cell is 10 mm, which is about 0.037 wavelength at the first resonant frequency. Simulation results indicate that the proposed FSS has a frequency shift smaller than 1% for different polarizations with an oblique incident angle of 60°. A prototype of the FSS is fabricated and measured. The measurement results show that the FSS is polarization-insensitive and angle-insensitive.

scholarly journals A balanced-to-balanced directional coupler based on branch-slotline coupled structure

Frequenz ◽  
2020 ◽  
Vol 74 (11-12) ◽  
pp. 427-433
Author(s):  
Yaxin Liu ◽  
Feng Wei ◽  
Xiaowei Shi ◽  
Cao Zeng
Keyword(s):  
Directional Coupler ◽  
Return Loss ◽  
Design Method ◽  
Differential Mode ◽  
Arbitrary Power ◽  
Measurement Results ◽  
Transition Structures ◽  
Coupled Structures ◽  
Better Than ◽  
Good Agreement

AbstractIn this paper, a balanced-to-balanced (BTB) branch-slotline directional coupler (DC) is firstly presented, which can realize an arbitrary power division ratios (PDRs). The coupler is composed by microstrip-to-slotline (MS) transition structures and branch-slotline coupled structures. The single-ended to balanced-ended conversion is simplified and easy to implemented by the MS transition structures, which intrinsically leads to the differential-mode (DM) transmission and common-mode (CM) suppression. Moreover, the different PDRs which are controlled by the widths of branch-slotlines can be achieved. In order to verify the feasibility of the proposed design method, two prototype circuits of the proposed coupler with different PDRs are fabricated and measured. The return loss and the isolation of two designs are all better than 10 dB. Moreover, the CM suppressions are greater than 35 dB. A good agreement between the simulation and measurement results is observed.

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