Extremely Low-Profile Monopolar Microstrip Antenna with Wide Bandwidth

Ha, Young-Seok; Jung, Jae-il; Lee, Sung‐Hee; Pyo, Seongmin

doi:10.3390/s21165295

Cited by 3 publications

(2 citation statements)

References 37 publications

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“…In [16], a single coax fed rectangular patch antenna has a complex structure with four different slots introduced in the four quadrants of the patch to excite two degenerate orthogonal modes generating CP with narrow 3 dB axial ratio bandwidth and low gain. Since impedance bandwidth (IBW) and axial ratio bandwidth (ARBW) are less in [12]- [16], many techniques to improve the bandwidth with circular polarization are discussed in [17]- [23], involving various hexagonal structures [18]- [22]. Simple stacked circular patches with CP dual-band operation [17] has an annular metal strip loaded ground plane with edge resistors to enhance the ARBW (9.6% and 7.1%) and a coupled-line trans-directional coupler to generate CP.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, a compact antenna that is circularly polarized with an omni-directional pattern satisfying GAGAN requirements is necessary. A multilayer, dual band CP hexagonal antenna with GAGAN specifications is proposed in this work, where the structure resembles the hexagonal antenna [22] in certain ways, having linear polarization adopted for a different objective and operational frequency.…”

Section: Introductionmentioning

confidence: 99%

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Hexagonal-Triangular Combinatorial Structure Based Dual-Band Circularly Polarized Patch Antenna for GAGAN Receivers

Sahana

Jayakumar

2023

IEEE Access

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A multilayer gap-coupled dual band hexagonal microstrip patch antenna is presented for GPS Aided GEO Augmented Navigation (GAGAN) receivers. GAGAN is developed by AAI (Airport Authority of India) and ISRO (Indian Space Research Organization) exclusively for aviation purposes with the GPS frequencies L5 (1176.45 MHz) and L1 (1575.42 MHz). The proposed GAGAN antenna has three trapezoidal and four equilateral triangular patch resonators configured to form a gap-coupled hexagonal patch on the top layer and seven equilateral triangular patches with slots in between to form the middle layer. Both the layers are fed by a single coax feed to achieve a dual band compact microstrip antenna of size 55 mm x 55 mm x 3.2 mm. Instead of designing the hexagonal antenna conventionally from a circular patch antenna, the sides of the equilateral triangular patch are truncated to obtain the proposed compact hexagonal antenna as the triangular antenna occupies less area when compared to circular or square patches for a fixed frequency. To bring in novelty with improved performance, the combinatorial structured configuration has been explored through step-by-step optimization. The aspects of GAGAN requirements like circular polarization with a single input, dual band operation and high gain with gain flatness are achieved with this compact structured antenna when compared to square and circular patch antennas. The combinatorial structures such as perturbation and truncation introduced in the patches are responsible for exciting two near-degenerate orthogonal modes producing circular polarization (CP). A cross slot etched in the center patch results in gain enhancement with a gain above 3.2 dBi over a bandwidth of 20 MHz in both the bands. Five shorting pins are added to achieve high impedance matching and good CP with an axial ratio (AR) below 2 dB. The simulated and measured results are found to be in good agreement with greater than 20 MHz operational bandwidth exhibiting CP with an omni-directional radiation pattern having high cross polar levels of -22 dB. The size reduction achieved in the proposed design is 56.79% when compared to the conventional hexagonal patch antenna. The measured 10 dB impedance bandwidth is 2.7% and 2.1% for L5 and L1 bands respectively with a 3 dB AR bandwidth of 2.3% for L5 and 2.0% for L1, satisfying GAGAN requirements.INDEX TERMS Circular polarization, dual band, global positioning system (GPS), GPS aided GEO augmented navigation receivers (GAGAN), hexagonal antenna, multilayer, triangular antenna.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hexagonal-Triangular Combinatorial Structure Based Dual-Band Circularly Polarized Patch Antenna for GAGAN Receivers

Sahana

Jayakumar

2023

IEEE Access

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Integrated Dual-Band Monopole Antenna with Frequency Selective Surface for Non-Invasive Biomedical Sensor Application

De Sousa Silva,

De Siqueira Campos,

Neto

et al. 2023

2023 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)

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Gap-coupled Designs of Hexagonal Microstrip Antennas on Thinner Substrate Using Cavity-backed Structure

Deshmukh,

Katira,

Ambekar

et al. 2024

PIER C

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Multi-resonator gap-coupled design of coaxially fed half-hexagonal microstrip antennas is proposed in 900 MHz frequency range. It yields an impedance bandwidth of 32 MHz (3.28%) on a thinner FR4 substrate (∼ 0.01λg). Reduction in patch area in the gap-coupled design is achieved by employing the ground plane slots. Slots reduce the fundamental mode resonance frequency on each patch, thereby realizing wideband response in a lower frequency region. With impedance bandwidth of 26 MHz (3.4%), slot cut ground plane design provides patch area reduction by 38.13% and frequency reduction by 21.8%. Enhancement in the broadside gain on a thinner lossy substrate in the gap-coupled designs is achieved by integrating a cavity-back structure which provides gain increment by nearly 2.5-3 dBi. Thus, the proposed work outlines a technique that enhances the bandwidth and reduces the patch size with an increment in the gain, on a thinner lossy substrate. An experimental verification for the obtained results is carried out that shows a close agreement.

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Extremely Low-Profile Monopolar Microstrip Antenna with Wide Bandwidth

Cited by 3 publications

References 37 publications

Hexagonal-Triangular Combinatorial Structure Based Dual-Band Circularly Polarized Patch Antenna for GAGAN Receivers

Hexagonal-Triangular Combinatorial Structure Based Dual-Band Circularly Polarized Patch Antenna for GAGAN Receivers

Integrated Dual-Band Monopole Antenna with Frequency Selective Surface for Non-Invasive Biomedical Sensor Application

Gap-coupled Designs of Hexagonal Microstrip Antennas on Thinner Substrate Using Cavity-backed Structure

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