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A single-layer compact frequency-selective surface (FSS) covering ultra-wideband application is presented in this letter. The proposed FSS constructed with convoluted elements exhibit band-stop response covering a frequency spectrum of 3.1–13.3 GHz at 10 dB. The prototype of the FSS is fabricated and the measured results seem to be in good agreement with the simulated result. Also, the designed FSS manifest polarization independent performance and good angular stability. [ABSTRACT FROM AUTHOR]

A novel miniaturized frequency selective surface (FSS) with a band-stop response at 1.6 GHz is presented in this letter. The designed FSS comprises convoluted elements connected via plated-through holes, which increases the overall electrical length. The proposed FSS unit cell provides the miniaturization of 0.034 λ0 × 0.034 λ0, where λ0 is the free space wavelength corresponding to the resonant frequency. The drafted FSS is polarization independent and angularly stable for both TE and TM polarizations. A prototype of the FSS is fabricated and its simulated results are validated with measurements. [ABSTRACT FROM AUTHOR]

A reconfigurable frequency-selective surface (RFSS) for electromagnetic shielding applications is presented in this letter. The unit cell of the proposed RFSS contains a pair of shorted square loops separated by a uniform distance. Wideband RFSS with the frequency tuning ratio of 1:2.34 achieved by varying the horizontal spacing is proposed. The RFSS covers the frequencies 3.5, 5, and 5.8 GHz shielding the WiMAX, WLAN, and ISM/WiMAX bands, respectively. The prototype of the proposed RFSS is fabricated and loaded on to the mechanical tuning setup. The tuning setup has a box frame with rotating shafts attached to the bevel gears to control the horizontal spacing. The use of collapsible linkage mechanism ensures uniform spacing during reconfigurable operation. The simulated results are validated with measurements. The proposed FSS offers wideband frequency tuning for electromagnetic shielding applications. [ABSTRACT FROM AUTHOR]

A novel reconfigurable 3-D frequency selective surface (FSS) exhibiting bandstop response is proposed in this paper. The unit cell of the proposed 3-D FSS is constructed from concentric threaded cylinders. The proposed novel 3-D FSS achieves reconfigurability by sliding technique. It offers frequency tuning from 1.86 to 3.10 GHz by sliding the outer cylinder over the inner cylinder. The proposed FSS offers bandstop response in the L- and S-band microwave frequencies. In addition, the proposed 3-D FSS provides polarization- and angular-independent operation. The prototype of the 3-D FSS is fabricated, and the simulation results are validated using measurements. [ABSTRACT FROM PUBLISHER]

This letter presents the design and implementation of a compact microstrip filter with frequency and bandwidth (BW) reconfiguration. The proposed filter consists of a transmission line coupled with a U-shaped microstrip line resonator. Varactor diodes are deployed at specific locations and are tuned to achieve BW and frequency reconfiguration from 0.8 to 1.5 GHz. The transition from the bandpass mode to the bandstop mode is achieved by reconfiguring the transmission zeros simultaneously. The filter percentage lower passband edge tuning and 17.33% higher passband edge tuning. The proposed filter has simple geometry, low profile, and offers a higher level of operational flexibility in the designed frequency range. The filter is tuned with the help of simple actuators requiring simple bias circuitry. The prototype filter is fabricated, and the simulation results are validated using the experimental measurements. [ABSTRACT FROM AUTHOR]

A low profile dual-band frequency selective surface (FSS) for shielding the GSM applications is presented in this paper. The proposed FSS contains the unit cell made of modified double square loop elements with paper as its substrate. The overall thickness of the proposed FSS measures only 0.55 mm. The FSS offers band stop response at 930 and 1720 MHz with 18 dB shielding effectiveness for a bandwidth of 100 and 173 MHz, respectively, thus shielding the GSM signals. Additionally, the modified double square loop element-based FSS is symmetrical providing the advantage of polarization independency. It also exhibits angular stability up to 60° for both the horizontal polarized electric field (TE mode) and vertically polarized electric field (TM mode). A prototype of the proposed dual-band low profile FSS is fabricated. The simulation results are compared with the experimental results and are found to be in congruence with each other. [ABSTRACT FROM PUBLISHER]

A novel angular independent dual-band FSS with closely spaced response is discussed in this letter. The proposed single layer FSS comprises of unit cell resembling crooked cross geometry convoluted and branched to provide dual resonant paths. The FSS functioning as a band stop filter at 2.54 and 3.54 GHz works as a shielding component for S band operation. The unit cell size of the proposed FSS is 0.088 \lambda \times 0.088 \lambda where \lambda corresponds to the wavelength of the first resonant frequency. Both the bands are closely spaced providing the frequency ratio of upper to the lower resonant frequency value of 1.39. Additionally, the proposed dual-band FSS is symmetrical in nature, thereby providing identical stop-band response for both TE and TM operation modes. It also exhibits highly stable angular stability. Prototype of the proposed FSS is fabricated and its simulated results are compared with the experimental results. [ABSTRACT FROM PUBLISHER]