2021 IEEE Indian Conference on Antennas and Propagation (InCAP), Dec 13, 2021
The paper presents the design of a polarized unit cell of frequency selective surface (FSS) to pa... more The paper presents the design of a polarized unit cell of frequency selective surface (FSS) to pass over 5.5 GHz range for WLAN system application interoperability in microwave domain. The proposed FSS unit cell exhibits size reduction using Meander line topology with transmission bandwidth of nearly 340 MHz. Meander line antennas are electrically small antennas having wide usage in mobile communications. Since the two-fold nature of designed FSS does not have rotational symmetry, it seems sensitive to variation of incidence angle stability up to 60° angle of rotation. An efficient method for computationally analyzing such FSS using CST Microwave Studio Suite 2020 is presented.
A single layer frequency selective rasorber exhibiting dual-band transmissive and dual-band absor... more A single layer frequency selective rasorber exhibiting dual-band transmissive and dual-band absorber characteristics is proposed. The dual-band absorber characteristics are achieved by two concentric circular rings with circular stubs on outer ring and circular slots in inner ring. The dual-band transmissive characteristics are achieved by two concentric circular ring apertures with additional quad diagonally circular rings. The absorber rings and transmissive aperture rings are separated by 0.8 mm thick FR-4 substrate. The Equivalent Circuit Model of the proposed Frequency Selective Rasorber (FSR) structure has been rigorously analyzed to understand the behavior of the quad-band transmissive and absorber characteristics. The measurement results demonstrated that a pass band with a minimal insertion loss of 0.21 dB can be achieved at 7.38 GHz and 10.80 GHz. The absorption rates of higher than 95% were obtained at 3.28 GHz and 16.618 GHz. The proposed quad-band FSR also verifies the polarization-insensitive behavior from 0° to 45°. Measurement results of proposed quad-band FSR prototype demonstrated superior agreement with simulated results and analytically ECM results. As compared to earlier reported geometries, novelty lies in its compact topology, higher angular stability, polarization insensitivity, and in band transmission response at desired range for filtering out unwanted signals in metrological satellites, surface ship radars, and various Radome applications.
2021 IEEE Indian Conference on Antennas and Propagation (InCAP), Dec 13, 2021
In this work a multi wideband circularly polarized (CP) compact antenna is designed. CP is achiev... more In this work a multi wideband circularly polarized (CP) compact antenna is designed. CP is achieved by loading stubs and slots in the ground plane. It provides wide impedance bandwidth (IBW) and axial ratio bandwidth (3-dB ARBW). Coplanar waveguide feeding techniques has been used to achieve significant gain and stable radiation pattern. It provides peak gain about 5dB. Rigorous simulation is done using CST MWS for design optimization and result computation. This antenna design provides a 3dB ARBW (4-9.2 GHz) and (11.9-15.04 GHz) while the IBW are (3.6-9.11GHz) and (10-13.5 GHz) for lower and upper bands respectively. The overall floor area of proposed antenna is 20 × 20 mm2.
2021 IEEE Indian Conference on Antennas and Propagation (InCAP), Dec 13, 2021
In this paper a novel design of single layer substrate FSS loading dual band pass enabling applic... more In this paper a novel design of single layer substrate FSS loading dual band pass enabling applications is proposed. Unit cell of proposed Frequency Selective Surface structure comprises of H shaped loop with square ring printed on a lossy dielectric FR-4 substrate. Polarization-sensitivity and angularly stability (up to 60°) due to variation for both of the TM and TE polarizations has been proposed. The proposed structure satisfies the needed requirements for C- Band applications.
2021 IEEE Indian Conference on Antennas and Propagation (InCAP), Dec 13, 2021
This paper describes a novel design of Wilkinson power divider at 2.63GHz using a HFSS software f... more This paper describes a novel design of Wilkinson power divider at 2.63GHz using a HFSS software for dividing the power equally at both the output port and the phase imbalance between the output port is given as 90 degree phase difference with the help of unequal length of the port 2 with respect to port 3. A quarter wave transformer is proposed in this design of $\lambda/4$ length. The simulated results show that the return loss and isolation are satisfactory. The 100Ω resistance is required to provide the isolation between the outputs. The substrate of RO3003, dielectric constant 3, loss tangent 0.0013 is used in the simulated design. The results of simulations and measurements describe the implementation of the presented method.
2021 IEEE Indian Conference on Antennas and Propagation (InCAP), Dec 13, 2021
In this proposed paper we presented a planer patch antenna with defected ground structure, whose ... more In this proposed paper we presented a planer patch antenna with defected ground structure, whose frequencies ranges from multiband and single wideband. The overall size of the metallic patch antenna is 6.5x12.5mm2 with 50Ω impedance matching microstrip feed line. The simulated results of this configuration are return loss, VSWR, radiation pattern, surface current and gain. Bandwidth of the metallic patch antenna with their respective frequencies are 1.25% at 0.032 THz, 1.32% at 0.057 THz, 1.17% at 0.069 THz, 12.22% at 0.080 THz, 0.97% at 0.093 THz and 3.61% at 0.112 THz. The whole operation has been performed by using CST Microwave Studio.
This paper presents the design of a multi-band planar bandpass Frequency Selective Surface with t... more This paper presents the design of a multi-band planar bandpass Frequency Selective Surface with the novel rings and a modified Jerusalem cross integrated structure. To begin, the proposed FSS array geometry is defined by constructing a unit cell size of order of 0.57 λ 0 × 0.57 λ 0 where λ 0 represents free-space wavelength of the first resonant frequency of the FSS periodic structure using novel concentric rings, leading to low profile design. The array structure is fabricated on the substrate material FR4 with a permittivity of 4.4 and having a thickness of 0.8 mm. Combination of concentric rings and Jerusalem Integrated Structure is examined. Low-profile, simpler design, improved angular and polarization stability are all benefits of the proposed FSS. The proposed FSS structure is designed to obtain a stable frequency response over entire Ku band. The simulated and experimental results are measured in a free space measurement setup, which indicate resonances at 12.39 GHz, 14.63 GHz, 16.11 GHz and 17.82 GHz, exhibits supported band pass frequency ratio 1.43 for Ku band applications. The simulated, equivalent circuit model and experimental results showed that the experimental results agree well with the simulated results for both TE (Transverse Electric) mode and TM (Transverse Magnetic) mode of polarization.
Sadhana-academy Proceedings in Engineering Sciences, Jan 10, 2023
In this paper, a novel loop-based multiband bandpass frequency selective surface (FSS) structure ... more In this paper, a novel loop-based multiband bandpass frequency selective surface (FSS) structure has been presented. The presented unit cell has been designed using the two square loops and two octagon loops for achieving the multiband characteristics, which are extensively utilized in a wide range of applications. The sporadic arrangement of these four loops is the key factor in passing the Wi-Max (2.5–2.7 GHz, 3.4–3.6 GHz) and WLAN (center frequency 5.5 GHz) frequency bands. The miniaturized structure gives a wide bandwidth at all three bands and provides stable resonance for a wider angle of incidence due to the orientation of loops. The size of the unit cell is 0.15 λ * 0.15 λ, where λ is the wavelength of the first resonant frequency. A 16 * 16 array of the proposed unit cell is fabricated over an FR4 substrate, and its simulated and measured results are presented, which are in good agreement. The advantage of the proposed FSS structure is its miniaturized configuration showing more comprehensive angular stability and polarization-independent characteristics.
2021 IEEE Indian Conference on Antennas and Propagation (InCAP), Dec 13, 2021
The proposed paper presents designing of left hand circularly polarized microstrip patch antenna ... more The proposed paper presents designing of left hand circularly polarized microstrip patch antenna array at Ku band for satellite communication. Stacking in this configuration enhances the bandwidth, and array configuration provides larger directivity. Approximate 20% return loss bandwidth and greater than 14dBi gain can be achieved using proposed technique. Truncations on patches give circular polarization. Feeder network is connected on back side to overcome the effect of spurious rations and cross polarization. To reduce the amount of cross polarization, cross pol suppressor is used in the proposed work. The design procedure is discussed.
In this paper, a novel loop-based multiband bandpass frequency selective surface (FSS) structure ... more In this paper, a novel loop-based multiband bandpass frequency selective surface (FSS) structure has been presented. The presented unit cell has been designed using the two square loops and two octagon loops for achieving the multiband characteristics, which are extensively utilized in a wide range of applications. The sporadic arrangement of these four loops is the key factor in passing the Wi-Max (2.5–2.7 GHz, 3.4–3.6 GHz) and WLAN (center frequency 5.5 GHz) frequency bands. The miniaturized structure gives a wide bandwidth at all three bands and provides stable resonance for a wider angle of incidence due to the orientation of loops. The size of the unit cell is 0.15 λ * 0.15 λ, where λ is the wavelength of the first resonant frequency. A 16 * 16 array of the proposed unit cell is fabricated over an FR4 substrate, and its simulated and measured results are presented, which are in good agreement. The advantage of the proposed FSS structure is its miniaturized configuration showing more comprehensive angular stability and polarization-independent characteristics.
2021 IEEE Indian Conference on Antennas and Propagation (InCAP), 2021
In this work a multi wideband circularly polarized (CP) compact antenna is designed. CP is achiev... more In this work a multi wideband circularly polarized (CP) compact antenna is designed. CP is achieved by loading stubs and slots in the ground plane. It provides wide impedance bandwidth (IBW) and axial ratio bandwidth (3-dB ARBW). Coplanar waveguide feeding techniques has been used to achieve significant gain and stable radiation pattern. It provides peak gain about 5dB. Rigorous simulation is done using CST MWS for design optimization and result computation. This antenna design provides a 3dB ARBW (4-9.2 GHz) and (11.9-15.04 GHz) while the IBW are (3.6-9.11GHz) and (10-13.5 GHz) for lower and upper bands respectively. The overall floor area of proposed antenna is 20 × 20 mm 2 .
2021 IEEE Indian Conference on Antennas and Propagation (InCAP), Dec 13, 2021
The paper presents the design of a polarized unit cell of frequency selective surface (FSS) to pa... more The paper presents the design of a polarized unit cell of frequency selective surface (FSS) to pass over 5.5 GHz range for WLAN system application interoperability in microwave domain. The proposed FSS unit cell exhibits size reduction using Meander line topology with transmission bandwidth of nearly 340 MHz. Meander line antennas are electrically small antennas having wide usage in mobile communications. Since the two-fold nature of designed FSS does not have rotational symmetry, it seems sensitive to variation of incidence angle stability up to 60° angle of rotation. An efficient method for computationally analyzing such FSS using CST Microwave Studio Suite 2020 is presented.
A single layer frequency selective rasorber exhibiting dual-band transmissive and dual-band absor... more A single layer frequency selective rasorber exhibiting dual-band transmissive and dual-band absorber characteristics is proposed. The dual-band absorber characteristics are achieved by two concentric circular rings with circular stubs on outer ring and circular slots in inner ring. The dual-band transmissive characteristics are achieved by two concentric circular ring apertures with additional quad diagonally circular rings. The absorber rings and transmissive aperture rings are separated by 0.8 mm thick FR-4 substrate. The Equivalent Circuit Model of the proposed Frequency Selective Rasorber (FSR) structure has been rigorously analyzed to understand the behavior of the quad-band transmissive and absorber characteristics. The measurement results demonstrated that a pass band with a minimal insertion loss of 0.21 dB can be achieved at 7.38 GHz and 10.80 GHz. The absorption rates of higher than 95% were obtained at 3.28 GHz and 16.618 GHz. The proposed quad-band FSR also verifies the polarization-insensitive behavior from 0° to 45°. Measurement results of proposed quad-band FSR prototype demonstrated superior agreement with simulated results and analytically ECM results. As compared to earlier reported geometries, novelty lies in its compact topology, higher angular stability, polarization insensitivity, and in band transmission response at desired range for filtering out unwanted signals in metrological satellites, surface ship radars, and various Radome applications.
2021 IEEE Indian Conference on Antennas and Propagation (InCAP), Dec 13, 2021
In this work a multi wideband circularly polarized (CP) compact antenna is designed. CP is achiev... more In this work a multi wideband circularly polarized (CP) compact antenna is designed. CP is achieved by loading stubs and slots in the ground plane. It provides wide impedance bandwidth (IBW) and axial ratio bandwidth (3-dB ARBW). Coplanar waveguide feeding techniques has been used to achieve significant gain and stable radiation pattern. It provides peak gain about 5dB. Rigorous simulation is done using CST MWS for design optimization and result computation. This antenna design provides a 3dB ARBW (4-9.2 GHz) and (11.9-15.04 GHz) while the IBW are (3.6-9.11GHz) and (10-13.5 GHz) for lower and upper bands respectively. The overall floor area of proposed antenna is 20 × 20 mm2.
2021 IEEE Indian Conference on Antennas and Propagation (InCAP), Dec 13, 2021
In this paper a novel design of single layer substrate FSS loading dual band pass enabling applic... more In this paper a novel design of single layer substrate FSS loading dual band pass enabling applications is proposed. Unit cell of proposed Frequency Selective Surface structure comprises of H shaped loop with square ring printed on a lossy dielectric FR-4 substrate. Polarization-sensitivity and angularly stability (up to 60°) due to variation for both of the TM and TE polarizations has been proposed. The proposed structure satisfies the needed requirements for C- Band applications.
2021 IEEE Indian Conference on Antennas and Propagation (InCAP), Dec 13, 2021
This paper describes a novel design of Wilkinson power divider at 2.63GHz using a HFSS software f... more This paper describes a novel design of Wilkinson power divider at 2.63GHz using a HFSS software for dividing the power equally at both the output port and the phase imbalance between the output port is given as 90 degree phase difference with the help of unequal length of the port 2 with respect to port 3. A quarter wave transformer is proposed in this design of $\lambda/4$ length. The simulated results show that the return loss and isolation are satisfactory. The 100Ω resistance is required to provide the isolation between the outputs. The substrate of RO3003, dielectric constant 3, loss tangent 0.0013 is used in the simulated design. The results of simulations and measurements describe the implementation of the presented method.
2021 IEEE Indian Conference on Antennas and Propagation (InCAP), Dec 13, 2021
In this proposed paper we presented a planer patch antenna with defected ground structure, whose ... more In this proposed paper we presented a planer patch antenna with defected ground structure, whose frequencies ranges from multiband and single wideband. The overall size of the metallic patch antenna is 6.5x12.5mm2 with 50Ω impedance matching microstrip feed line. The simulated results of this configuration are return loss, VSWR, radiation pattern, surface current and gain. Bandwidth of the metallic patch antenna with their respective frequencies are 1.25% at 0.032 THz, 1.32% at 0.057 THz, 1.17% at 0.069 THz, 12.22% at 0.080 THz, 0.97% at 0.093 THz and 3.61% at 0.112 THz. The whole operation has been performed by using CST Microwave Studio.
This paper presents the design of a multi-band planar bandpass Frequency Selective Surface with t... more This paper presents the design of a multi-band planar bandpass Frequency Selective Surface with the novel rings and a modified Jerusalem cross integrated structure. To begin, the proposed FSS array geometry is defined by constructing a unit cell size of order of 0.57 λ 0 × 0.57 λ 0 where λ 0 represents free-space wavelength of the first resonant frequency of the FSS periodic structure using novel concentric rings, leading to low profile design. The array structure is fabricated on the substrate material FR4 with a permittivity of 4.4 and having a thickness of 0.8 mm. Combination of concentric rings and Jerusalem Integrated Structure is examined. Low-profile, simpler design, improved angular and polarization stability are all benefits of the proposed FSS. The proposed FSS structure is designed to obtain a stable frequency response over entire Ku band. The simulated and experimental results are measured in a free space measurement setup, which indicate resonances at 12.39 GHz, 14.63 GHz, 16.11 GHz and 17.82 GHz, exhibits supported band pass frequency ratio 1.43 for Ku band applications. The simulated, equivalent circuit model and experimental results showed that the experimental results agree well with the simulated results for both TE (Transverse Electric) mode and TM (Transverse Magnetic) mode of polarization.
Sadhana-academy Proceedings in Engineering Sciences, Jan 10, 2023
In this paper, a novel loop-based multiband bandpass frequency selective surface (FSS) structure ... more In this paper, a novel loop-based multiband bandpass frequency selective surface (FSS) structure has been presented. The presented unit cell has been designed using the two square loops and two octagon loops for achieving the multiband characteristics, which are extensively utilized in a wide range of applications. The sporadic arrangement of these four loops is the key factor in passing the Wi-Max (2.5–2.7 GHz, 3.4–3.6 GHz) and WLAN (center frequency 5.5 GHz) frequency bands. The miniaturized structure gives a wide bandwidth at all three bands and provides stable resonance for a wider angle of incidence due to the orientation of loops. The size of the unit cell is 0.15 λ * 0.15 λ, where λ is the wavelength of the first resonant frequency. A 16 * 16 array of the proposed unit cell is fabricated over an FR4 substrate, and its simulated and measured results are presented, which are in good agreement. The advantage of the proposed FSS structure is its miniaturized configuration showing more comprehensive angular stability and polarization-independent characteristics.
2021 IEEE Indian Conference on Antennas and Propagation (InCAP), Dec 13, 2021
The proposed paper presents designing of left hand circularly polarized microstrip patch antenna ... more The proposed paper presents designing of left hand circularly polarized microstrip patch antenna array at Ku band for satellite communication. Stacking in this configuration enhances the bandwidth, and array configuration provides larger directivity. Approximate 20% return loss bandwidth and greater than 14dBi gain can be achieved using proposed technique. Truncations on patches give circular polarization. Feeder network is connected on back side to overcome the effect of spurious rations and cross polarization. To reduce the amount of cross polarization, cross pol suppressor is used in the proposed work. The design procedure is discussed.
In this paper, a novel loop-based multiband bandpass frequency selective surface (FSS) structure ... more In this paper, a novel loop-based multiband bandpass frequency selective surface (FSS) structure has been presented. The presented unit cell has been designed using the two square loops and two octagon loops for achieving the multiband characteristics, which are extensively utilized in a wide range of applications. The sporadic arrangement of these four loops is the key factor in passing the Wi-Max (2.5–2.7 GHz, 3.4–3.6 GHz) and WLAN (center frequency 5.5 GHz) frequency bands. The miniaturized structure gives a wide bandwidth at all three bands and provides stable resonance for a wider angle of incidence due to the orientation of loops. The size of the unit cell is 0.15 λ * 0.15 λ, where λ is the wavelength of the first resonant frequency. A 16 * 16 array of the proposed unit cell is fabricated over an FR4 substrate, and its simulated and measured results are presented, which are in good agreement. The advantage of the proposed FSS structure is its miniaturized configuration showing more comprehensive angular stability and polarization-independent characteristics.
2021 IEEE Indian Conference on Antennas and Propagation (InCAP), 2021
In this work a multi wideband circularly polarized (CP) compact antenna is designed. CP is achiev... more In this work a multi wideband circularly polarized (CP) compact antenna is designed. CP is achieved by loading stubs and slots in the ground plane. It provides wide impedance bandwidth (IBW) and axial ratio bandwidth (3-dB ARBW). Coplanar waveguide feeding techniques has been used to achieve significant gain and stable radiation pattern. It provides peak gain about 5dB. Rigorous simulation is done using CST MWS for design optimization and result computation. This antenna design provides a 3dB ARBW (4-9.2 GHz) and (11.9-15.04 GHz) while the IBW are (3.6-9.11GHz) and (10-13.5 GHz) for lower and upper bands respectively. The overall floor area of proposed antenna is 20 × 20 mm 2 .
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