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Journal ArticleDOI

Application-Friendly Improved Designs of Single-Fed Circularly Polarized Microstrip Antenna [Antenna Applications Corner]

TL;DR: In this article, a Truncated-corner probe-fed (TCPF) antenna with a very low axial ratio (AR) was used to provide approximately 0.3% CP bandwidth (AR l 3 dB along with S11 l-10 dB).
Abstract: Truncated-corner probe-fed (TCPF) patches are popular for their simple design that provides circularly polarized (CP) radiation with a very low axial ratio (AR). For a thin substrate (s 0.026lg), this antenna provides approximately 0.3% CP bandwidth (BW) (AR l 3 dB along with S11 l-10 dB). However, as the substrate thickness is increased for enhancing the matching BW, an offset among the frequencies featured with minimum AR and optimum S11 is observed. This degrades the effective BW, with an overlapping of both S11 l-10 dB and AR l 3 dB.
Citations
More filters
Journal ArticleDOI
TL;DR: In this paper, an improved tuning of defected ground structure geometries for circular patch with twofold objective: to minimize the defect size by strategic shaping and deployment and, at the same time, to maintain the highest order of achievable suppression of cross-polarized (XP) radiations.
Abstract: This letter explores improved tuning of defected ground structure (DGS) geometries for circular patch with twofold objective: to minimize the defect size by strategic shaping and deployment and, at the same time, to maintain the highest order of achievable suppression of cross-polarized (XP) radiations. Relative merits and demerits of the earlier designs have been accounted for, to justify the need of further comprehensive improvement. The DGS dimensions in several cases appear as a limiting factor, especially in arrays. This letter resolves the same and reduces the size by at least 35%. Asymmetrically configured designs have been emphasized with a view to addressing the asymmetry in modal fields. They are examined in X -band and experimentally verified with a promise to achieve 16–18 dB XP suppression over H -plane, which, to the best of authors’ knowledge, is the maximum reported suppression so far.

23 citations


Cites background from "Application-Friendly Improved Desig..."

  • ...Continuous developments have resulted in new design methodologies [12], [13]....

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Journal ArticleDOI
TL;DR: In this article, the authors proposed a DGS-based solution to the problem of excess backside radiation caused by the cross-polarized (XP) fields, which is being faced by all defected ground structure (DGS) integrated patches.
Abstract: This letter addresses a practical issue of excess backside radiation caused by the cross-polarized (XP) fields, which is being faced by all defected ground structure (DGS) integrated patches. Defects or slots on the ground plane (GP) suppresses the H -plane XP fields. These strategic slots cause leakage of XP fields toward the backside of the antenna. This letter, for the first time, explores the physical insight behind this phenomenon with an aim to find a solution. Engineering on the backside of the GP has been conceived and systematically developed in the form of a pair of electric walls with varied geometries. Serrated comb-shaped geometry has been proposed finally. A thorough DGS-based design along with its experimental validation in the X -band ensures a reduction in XP radiation nearly by 10 dB in the backside maintaining its front-side reduction by 16–18 dB. This also reduces the usual backward radiation originated from the copolarized fields. Although the GP engineering makes the structure nonplanar, its advanced features may find potential applications where significantly low XP standalone antennas are required, such as wireless base stations, to onboard satellite systems.

10 citations


Cites background from "Application-Friendly Improved Desig..."

  • ...DGS has also been explored for circularly polarized design [8]....

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Journal ArticleDOI
02 Mar 2021
TL;DR: In this article, a fluidically loaded microstrip patch antenna on a multi-layered substrate with frequency and polarization reconfigurability in the 2400 MHz band is presented, which exhibits frequency tunable linearly polarized (LP) and circularly polarized (CP) modes with asymmetric loading.
Abstract: This paper presents a fluidically loaded microstrip patch antenna on a multi-layered substrate with frequency and polarization reconfigurability in the 2400 MHz band. A square patch loaded at all the corners with short circuited $\lambda _{g}/4$ long stubs is utilized. An arrangement of fluidic channels fabricated by moulding Polydimethylsiloxane (PDMS) with 3D printed mould is incorporated beneath each stub. By injecting or withdrawing distilled water into the channels, variable loads are realized. It exhibits frequency tunable linearly polarized (LP) mode with symmetric loading or circularly polarized (CP) mode with asymmetric loading. The sense of CP can be switched by swapping the loading configuration along the diagonals of the patch. The equivalent circuit for the antenna is presented. A prototype is fabricated and measured. In LP mode, frequency tuning of 7.85% is achieved. The minimum realized gain is 5.67 dBi with cross-polarization (X-pol) isolation $\geq20$ dB. In the CP modes, the overlapping bandwidth for ${\mid }\text{S}_{11}{\mid } \leq -10$ dB and axial ratio $\leq3$ dB (ARBW) is $\geq16$ MHz for both LHCP/RHCP modes. Frequency tuning of 141 MHz (5.76%) is measured in the RHCP mode. The minimum realized gain is 4.86 dBic and total efficiency is >60%.

7 citations

Journal ArticleDOI
TL;DR: In this article, the fringing characteristics as well as modal fields of a suspended substrate circular patch are restricted to achieve wide circularly polarized (CP) bandwidth in a simple probe-fed microstrip antenna.
Abstract: Achieving wide circularly polarized (CP) bandwidth in a simple probe-fed microstrip antenna is essential for many practical applications. Existing knowledge guides exploring a thick substrate-based patch design. However, it suffers from two major inherent issues: squinting of beam and high cross-polarized (XP) radiation. No solution is available so far. This letter successfully addresses both issues by imposing restriction on the fringing characteristics as well as modal fields of a suspended substrate circular patch. Engineered ground plane bearing different strategic defects has been explored leading to about 50% correction in beam squinting with reference to antenna boresight and 2–8 dB reduction in a peak XP level. Realistic design, physical insight, and the experimental validation ensure its huge potential for practical applications.

5 citations


Cites background from "Application-Friendly Improved Desig..."

  • ...A few attempts were made to CP design [29]–[32] with an aim to achieve a usable CP bandwidth....

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Journal ArticleDOI
TL;DR: In this paper, a modified triangle quarter-wavelength patch is proposed and a compact circularly polarized antenna is designed by combining two of them, and the evolution process of the combined modified triangle quadrwavelength patches is depicted, and current distribution is analyzed to illustrate the right-hand circularly polarizing radiation generated by the designed antenna.
Abstract: A modified triangle quarter-wavelength patch is proposed in this letter, and a compact circularly polarized (CP) antenna is designed by combining two of them. The evolution process of the combined modified triangle quarter-wavelength patches is depicted, and the current distribution is analyzed to illustrate the right-hand circularly polarized radiation generated by the designed antenna. In order to achieve better performance, a subarray with high-gain radiation characteristics consisting of four radiators and a power distribution network is designed and fabricated within a compact size of 0.176 $\lambda _0^2$ and thickness of 0.026 $\lambda _0$ . The measured maximum gain is up to 8.4 dBic at 1.935 GHz, and the gain is flat in the operating frequency band with maximum ripple less than 0.9 dB.

4 citations

References
More filters
Book
31 Oct 2000
TL;DR: Feeding Techniques and Modeling, Design and Analysis of Microstrip Antenna Arrays: Parallel and Series Feed Systems, and Theory and Design of Active Integrated Micro Strip Antenna Amplifiers.
Abstract: Microstrip Radiators: Various Microstrip Antenna Configurations. Feeding Techniques and Modeling. Applications. Radiation Field. Surface Waves and Photonic Band-Gap Structures. Analytical Models for Microstrip Antennas: Transmission Line Model. Cavity Model. Generalized Cavity Model. Multi-port Network Model (MNM). Radiation Fields. Aperture Admittance. Mutual Admittance. Model for Coaxial Probe in Microstrip Antennas. Comparison of Analytical Models. Full-Wave Analysis of Microstrip Antennas: Spectral Domain Full-Wave Analysis. Mixed-Potential Integral Equation Analysis. Finite-Difference Time Domain Analysis.Rectangular Microstrip Antenna: Models for Rectangular Patch Antenna. Design Considerations for Rectangular Patch Antennas. Tolerance Analysis of Rectangular Microstrip Antennas. Mechanical Tuning of Patch Antennas. Quarter-wave Rectangular Patch Antenna. Circular Disk and Ring Antennas: Analysis of a Circular Disk Microstrip Antenna. Design Considerations for Circular Disk Antennas. Semicircular Disk and Circular Sector Microstrip Antennas. Comparison Of Rectangular And Circular Disk Microstrip Antennas. Circular Ring or Annular Ring Microstrip Antenna. Circular Sector Microstrip Ring Antenna. Microstrip Ring Antennas of Non-Circular Shapes. Dipoles and Triangular Patch Antennas: Microstrip Dipole and Center-Fed Dipoles. Triangular Microstrip Patch Antenna. Design of an Equilateral Triangular Patch Antenna. Microstrip Slot Antennas: Microstrip-Fed Rectangular Slot Antennas. CPW-Fed Slot Antennas. Annular Slot Antennas. Tapered Slot Antennas (TSA). Comparison of Slot Antennas with Microstrip Antennas. Circularly Polarized Microstrip Antennas and Techniques: Various Types of Circularly Polarized Microstrip Antennas. Singly-Fed Circularly Polarized Microstrip Antennas. Dual-Orthagonal Feed Circularly Polarized Microstrip Antennas. Circularly Polarized Traveling-Wave Microstrip-Line Arrays. Bandwidth Enhancement Techniques. Sequentially Rotated Arrays. Broad-Banding of Microstrip Antennas: Effect of Substrate Parameters on Bandwidth. Selection of Suitable Patch Shape. Selection of Suitable Feeding Technique. Multi-Moding Techniques. Other Broadbanding Techniques. Multifrequency Operation. Loaded Microstrip Antennas and Applications: Polarization Diversity Using Microstrip Antennas. Frequency Agile Microstrip Antennas. Radiation Pattern Control of Microstrip Antennas. Loading Effect of a Short. Compact Patch Antennas. Planar Inverted F Antenna. Dual-Frequency Microstrip Antennas. Dual-Frequency Compact Microstrip Antennas. Active Integrated Microstrip Antennas: Classification of Active Integrated Microstrip Antennas. Theory and Design of Active Integrated Microstrip Antenna Oscillators. Theory and Design of Active Integrated Microstrip Antenna Amplifiers. Frequency Conversion Active Integrated Microstrip Antenna Theory and Design. Design and Analysis of Microstrip Antenna Arrays: Parallel and Series Feed Systems. Mutual Coupling. Design of Linear Arrays. Design of Planar Arrays. Monolithic Integrated Phased Arrays.

3,612 citations


"Application-Friendly Improved Desig..." refers background in this paper

  • ...One of the simplest configurations is a single PF patch supporting a pair of orthogonal resonant modes, which are usually realized by physical perturbations on the patch surface [5]– [6]....

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  • ...Several techniques and configurations have been explored so far, including artificial grounds [2], modified feed networks [3], and stacked parasitic patches [4], which increase the design complexity, space, volume, and cost [5]....

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Journal ArticleDOI
TL;DR: In this article, three types of single-feed circularly polarized microstrip antennas, namely, a diagonal fed nearly square, a truncated-corners square and a square with a diagonal slot, are presented.
Abstract: Analysis and optimized designs are presented of three types of single feed circularly polarized microstrip antennas, namely, a diagonal fed nearly square, a truncated-corners square and a square with a diagonal slot. The Green's function approach and the desegmentation methods are used. The resonant frequencies are calculated for two orthogonal modes which together yield circular polarization. Optimum feed locations are determined for the best impedance match to a 50 \Omega coaxial feed line. Axial-ratio bandwidths, voltage standing-wave ratio (VSWR) bandwidths and radiation patterns are evaluated and verified experimentally.

602 citations


"Application-Friendly Improved Desig..." refers background or methods in this paper

  • ...An identical observation was also made in [6], where S11 corresponding to the minimum AR value reached approximately −8....

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  • ...h 0 02 g 2 m shows zero CP BW (frequencies featured with 3 AR dB 1 as well as S 10 dB 111- simultaneously) [6]....

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  • ...A TC square patch, as in [6], with probe feeding was used as the radiating element....

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  • ...Truncation at the patch corners is one such configuration [6] (Figure 1)....

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  • ...One of the simplest configurations is a single PF patch supporting a pair of orthogonal resonant modes, which are usually realized by physical perturbations on the patch surface [5]– [6]....

    [...]

Journal ArticleDOI
TL;DR: In this article, a computer simulation was made to clarify the polarization dependence of the high-speed transmission characteristics of an indoor communications system operating at 60 GHz in a room within a modern office building.
Abstract: Measurements of polarization dependence of multipath-propagation characteristics were conducted at 60 GHz in a room within a modern office building. Delay profiles were measured using a swept frequency method with a high time-delay resolution of 2 ns. Directions of arrival of the multipath components reflected from walls were analyzed by rotating a narrow-beam receiving antenna with an angular resolution of 5 degrees. Results of this experiment showed that multipath delayed waves due to wall reflection can be effectively suppressed by employing circular polarization instead of linear polarization. Based on this experimental result, a computer simulation was made to clarify the polarization dependence of the high-speed transmission characteristics of an indoor communications system operating at 60 GHz. >

151 citations

Journal ArticleDOI
TL;DR: In this paper, a defect ground structure (DGS)-integrated rectangular microstrip patch has been experimentally investigated with an aim to improve polarisation purity in radiated fields.
Abstract: Defected ground structure (DGS)-integrated rectangular microstrip patch has been experimentally investigated with an aim to improve polarisation purity in radiated fields. Width to length ratio (aspect ratio) of a patch attributes different characteristic features. Therefore present experimental studies have been executed for four different aspect ratio values like 1.6, 1.3, 1.0 and 0.8. Folded defects have been employed in H-plane. Possibility of achieving high polarisation purity (over 25 dB isolation between co- to cross-polarised fields) with improved impedance bandwidth has been demonstrated. The variation in XP fields as a function of the patch aspect ratio has been investigated and a strong physical insight into the modal fields with and without DGS has been developed.

82 citations


"Application-Friendly Improved Desig..." refers methods or result in this paper

  • ...This observation corroborates those for linear polarized antennas [8], where the DGS was found to ensure the field uniformity....

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  • ...The parameters were initially derived from the knowledge of [8], and their effects have been examined using the software found in [16]....

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Proceedings ArticleDOI
01 Dec 2016
TL;DR: In this paper, the radiation performance of a single probe-fed truncated corner square microstrip patch has been enhanced by employing a metal (PEC) ring contouring the patch on the patch side of the CP antenna, and a multi-section ring defect in the ground plane (GP) of the conventional CP antenna.
Abstract: The radiation performance of a circularly polarized (CP) single probe-fed truncated corner square microstrip patch has been enhanced by employing (i) a metal (PEC) ring contouring the patch on the patch side of the CP antenna, and (ii) a multi-section ring defect in the ground plane (GP) of the CP antenna. The concept has been validated by designing a CP patch with a conventional GP, a CP patch with a PEC ring contouring the patch and a ring type defect in the GP of the conventional CP patch. Proposed configurations appear to be ideal for many circularly polarized wireless and satellite communication applications. Simulated results confirm axial ratio (AR) of about (i) 1.1 dB for a CP antenna with a PEC ring contouring the patch and (ii) 0.1 dB for a CP antenna with ring type defect in the ground plane; compared to an AR of 2.7 dB for a conventional CP antenna, indicating an improvement in cross polarized (XP) isolation. AR bandwidth has also been improved by 70% in case of PEC ring contoured CP patch and almost 100% in case of ring type defected ground structure (DGS) integrated CP patch when compared with conventional CP antenna. These improvements have been achieved without affecting any other parameters such as impedance bandwidth and peak gain of the antenna.

2 citations


Additional excerpts

  • ...Some initial result was reported in [15], and this single-layer ring DGS inspired us to conceive yet another twolayer variant to achieve a similar effect....

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