scholarly journals DESIGN OF BROADBAND CIRCULARLY POLARIZED SQUARE SLOT ANTENNA WITH A COMPACT SIZE

2011 ◽  
Vol 120 ◽  
pp. 513-533 ◽  
Author(s):  
Jia-Yi Sze ◽  
Shien-Piao Pan
Keyword(s):  
Slot Antenna ◽  
Circularly Polarized ◽  
Compact Size

Broadband circularly polarized slot antenna arrays using linked elliptical slots forC- andX-band applications

2018 ◽  
Vol 10 (3) ◽  
pp. 328-335
Author(s):  
Saeed Mohammadi-Asl ◽  
Javad Nourinia ◽  
Changiz Ghobadi ◽  
Maryam Majidzadeh
Keyword(s):  
Frequency Band ◽  
Antenna Arrays ◽  
Axial Ratio ◽  
Array Element ◽  
Slot Antenna ◽  
Slot Antennas ◽  
Circularly Polarized ◽  
Compact Size ◽  
Feed Network ◽  
Sequential Phase

Compact broadband circularly polarized elliptical slot antenna arrays (CPESAAs) are devised based on 2 × 2 and 4 × 4 circularly polarized (CP) elliptical slot antennas and a sequential phase feed network. To realize the circular polarization, eight rectangular stubs are embedded in the feed structure to excite two orthogonal E vectors in 2 × 2 CPESAA configuration. Moreover, by taking four rectangular slots out from each array element, return loss and axial-ratio bandwidths are noticeably increased. The investigated simple array element has a compact size of 20 × 20 × 1 mm3. As well, 2 × 2 CPESAA occupies a compact size of 55 × 60 × 1 mm3, which operates within the frequency band 4.18–9.35 GHz. Thus, 76.4% of S11< −10 dB and 51.4% of CP bandwidth (4.43–7.5 GHz) are covered. Moreover, proposed 4 × 4 CPESAA is printed on 110 × 110 × 1 mm3FR4 substrate and covers the frequency band of 1.15–12.98 GHz with CP at 2.95–8.82 GHz. Throughout the study, the design process of the proposed antenna arrays are presented and discussed in detail.

scholarly journals Axial Ratio and Gain Enhancement of a Circular-Ring Slot Antenna Using a Pair of Asymmetrical Rectangular Slots and a Parasitic Patch for a Radio Beacon on a Nanosatellite

Aerospace ◽  
2019 ◽  
Vol 6 (4) ◽  
pp. 39 ◽  
Author(s):  
Peberlin Parulian Sitompul ◽  
Josaphat Tetuko Sri Sumantyo ◽  
Farohaji Kurniawan ◽  
Mohammad Nasucha
Keyword(s):  
Axial Ratio ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Electron Content ◽  
Antenna Gain ◽  
Total Electron ◽  
Circularly Polarized ◽  
Gain Enhancement ◽  
Compact Size ◽  
Parasitic Patch

Radio beacons enable measurements of ionospheric radio scintillations and total electron content (TEC). These beacons transmit unmodulated, phase-coherent waves in S-band frequencies. Many satellite applications require circularly polarized (CP) wideband antennas. Their compact size, lightweight, and simple fabrication method make CP antennas suitable for small satellite systems. The slot antenna has wideband impedance, but the 3 dB axial ratio bandwidth (ARBW) is narrower compared to the impedance bandwidth (IBW). In this paper, a circularly polarized circular-slotted antenna (CSA) is proposed to enhance the ARBW and the antenna gain. A pair of asymmetrical rectangular slots, a simple 50 Ω feedline and a parasitic patch were introduced to a CSA to enhance the 3 dB ARBW and the antenna gain. Rectangular slots were inserted on the diagonal axis of the CSA, the feedline was shifted to the left side of the x-axis, and a parasitic patch was attached to the circular slot. The lengths of the rectangular slots correspond to the resonant frequency, and the parasitic patch width corresponds to the higher frequency of the 3 dB ARBW. The asymmetrical rectangular slots, the shifted feedline, and the parasitic patch successfully improved the measured 3 dB ARBW of the antenna by 787.5 MHz or 35.79%. The measured gain of a CSA with left-hand circular polarization (LHCP) was also improved by shifting the feedline and the rectangular slot, achieving a peak gain of 5 dBic.

A wideband circularly polarized S ‐shaped slot antenna

2021 ◽  
Vol 31 (5) ◽  
Author(s):  
Wei He ◽  
Yejun He ◽  
Sai‐Wai Wong ◽  
Chao‐Hsiang Liao
Keyword(s):  
Slot Antenna ◽  
Circularly Polarized

S-Band Full-Metal Circularly-Polarized Cavity-Backed Slot Antenna with Wide Bandwidth and Wide Beamwidth

2021 ◽  
pp. 1-1
Author(s):  
Rui-Sen Chen ◽  
Lei Zhu ◽  
Sai-Wai Wong ◽  
Jing-Yu Lin ◽  
Yin Li ◽  
...  
Keyword(s):  
Slot Antenna ◽  
Wide Bandwidth ◽  
Circularly Polarized

A Nesting-L Slot Antenna With Enhanced Circularly Polarized Bandwidth and Radiation

2014 ◽  
Vol 13 ◽  
pp. 225-228 ◽  
Author(s):  
Guihong Li ◽  
Huiqing Zhai ◽  
Long Li ◽  
Changhong Liang
Keyword(s):  
Slot Antenna ◽  
Circularly Polarized
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