scholarly journals High-Gain Circularly-Polarized Elliptically-Annular Antenna-Array with Reduced Side-Lobe Level

2020 ◽  
Vol 9 (4) ◽  
pp. 2319-2325
Keyword(s):  
Circular Polarization ◽  
Antenna Array ◽  
Satellite Communication ◽  
Axial Ratio ◽  
Side Lobe ◽  
High Gain ◽  
Side Lobe Level ◽  
Single Element ◽  
Circularly Polarized ◽  
Gain Enhancement

A single feed microstrip patch elliptically annular antenna array has been proposed for high gain circularly polarized (CP) radiation. An array of elliptically annular patches antenna resonates at a frequency of 3.77 GHz which can be used in satellite communication and radar application. A corporate feed network with quarter-wave transformer has been used for uniform excitation of all the array elements. Thus a good circular polarization is obtained by using a single feed with enhanced gain 15.62 dB compared to single patch. The radiation pattern, axial ratio and input impedance of the proposed elliptically annular antenna array is compared with single element elliptically annular antenna. A substantial gain enhancement with low side lobe level (SLL) is observed keeping circular polarization intact. Further, simulated and measured results of the proposed antenna array have been compared and found that axial ratio and gain are in good agreement.

scholarly journals A Circularly Polarized Antenna Array with Gain Enhancement for Long-Range UHF RFID Systems

Electronics ◽  
2019 ◽  
Vol 8 (4) ◽  
pp. 400 ◽  
Author(s):  
Wei Hu ◽  
Guangjun Wen ◽  
Daniele Inserra ◽  
Yongjun Huang ◽  
Jian Li ◽  
...  
Keyword(s):  
Antenna Array ◽  
Long Range ◽  
Radio Frequency Identification ◽  
Coaxial Line ◽  
Axial Ratio ◽  
High Gain ◽  
Basic Element ◽  
Uhf Rfid ◽  
Circularly Polarized ◽  
Gain Enhancement

A 2 × 2 circularly polarized (CP) sequential rotation microstrip patch antenna array with high gain for long-range ultra-high frequency (UHF) radio frequency identification (RFID) communication is proposed in this paper. In order to meet the operational frequency band requirement of 840–960 MHz and, at the same time, achieve enhanced broadside gain, a two-level sequential rotation structure is developed. Series power divider is used as the basic element of the feed network that is implemented with the substrate-integrated coaxial line technology for minimizing radiation losses. The manufactured prototype exhibits a peak gain of 12.5 dBic at 900 MHz and an axial ratio (AR) bandwidth (AR ≤ 3 dB) of 18.2% from 828 to 994 MHz. In comparison with the state-of-the-art, the proposed antenna shows an excellent gain/size trade-off.

Ka Band RF Front-End Design

2018 ◽  
Vol 915 ◽  
pp. 231-236
Author(s):  
Harun Mecidoglu ◽  
Hamid Torpi
Keyword(s):  
Circular Polarization ◽  
Satellite Communication ◽  
Focal Point ◽  
Signal Transmission ◽  
Horn Antenna ◽  
Side Lobe ◽  
High Gain ◽  
Side Lobe Level ◽  
Front End ◽  
Rf Front End

In this thesis, the RF front-end was done at K/Ka (18-27 GHz/26.5-40 GHz) bands used for satellite communication and satellite TV [1]. In this study, vertical polarized signal transmission and horizontal polarized signal reception were performed. The design is set to be compatible with TURKSAT 4B [2]. RF front-end is consist of an offset dish providing high gain and low side lobe level (SLL) for collecting the signal, a circular horn antenna which is compatible with RHCP (Right Hand Circular Polarization) and LHCP (Left Hand Circular Polarization) polarizations at the focal point of the dish, to separate dual polarization an orthomode transducer (OMT) and a transmit reject filter to prevent the receiver from the strong signal generated at the transmitter side (cross-pol). In the design waveguide structures is used to work in microwave frequencies and for high power delivery requirements. AWR Microwave Office, Computer Simulation Technology (CST) and MATLAB (Matrix Laboratory) programs are used for simulation, optimization and calculations.

Non-uniform Feeding Network for a Dual Circularly Polarized 16×16 Ku-Band Antenna Array for On-Move Satellite Communication

2021 ◽  
Vol 36 (2) ◽  
pp. 115-125
Author(s):  
Walaa Hassan ◽  
Khalid Ibrahim ◽  
Esmat Abdallah ◽  
Ahmed Attiya
Keyword(s):  
Antenna Array ◽  
Satellite Communication ◽  
Single Layer ◽  
Side Lobe ◽  
Side Lobe Level ◽  
Antenna Structure ◽  
Circularly Polarized ◽  
Satellite Systems ◽  
Analysis And Design ◽  
Ku Band

This paper presents analysis and design of a dual circularly polarized 16×16 Ku band antenna array with emphasis on its feeding network. The proposed antenna is designed for on-move satellite communication system where the radiation pattern and the side-lobe level should meet the ITU standards to avoid interference with other satellite systems. This requirement is obtained by using non-uniform feeding distribution network. In addition, dual circular polarization operation requires sequential feeding networks with appropriate phase shift sequences. The proposed antenna is divided into 16 sub-cells of 4×4 radiating elements. The elements inside the sub-cell are fed by uniform dual sequential feeding networks. These sub-cells are connected together via two non-uniform feeding networks on a single layer in the shape of two interlaced fork configurations. In addition, cascaded power dividers are used to achieve the required low power division ratios between some of the sub-cells according to the required feeding distribution. These modifications simplify the fabrication process of the proposed antenna structure and reduce the required layers while satisfying the required radiation parameters.

scholarly journals Antena Susun Berpolarisasi Sirkular dengan Menggunakan Distribusi Daya Dolph Tschebycheff (Circularly Polarized Array Antenna Using Dolph Tschebycheff Power Distribution)

2020 ◽  
Vol 9 (1) ◽  
pp. 55-62
Author(s):  
Citra Zaskia Pratiwi ◽  
Achmad Munir
Keyword(s):  
Circular Polarization ◽  
Power Distribution ◽  
Axial Ratio ◽  
Dielectric Substrate ◽  
Side Lobe ◽  
Array Antenna ◽  
Side Lobe Level ◽  
Circularly Polarized ◽  
Measurement Results ◽  
Proximity Coupling

This paper discusses the design and realization of circularly polarized array antenna using Dolph Tschebycheff power distribution. The advantages of implementing circular polarization yield the array antenna suitable for outdoor communication system and can minimize the Faraday effect. The Dolph Tschebycheff power distribution is used to suppress the side lobe of array antenna. The proposed array antenna, which is intended to operate at the frequency of 5.3 GHz, consists of five square patch elements with seven diagonal slots upon each element to enhance the bandwidth and to produce the circular polarization. The array antenna is designed and realized using two layers of FR-4 epoxy dielectric substrate with the dimension of 119 mm × 44.1 mm and the thickness of 0.8 mm for each dielectric substrate. Each patch element is fed using a proximity coupling technique excited through a 50 Ω SMA connector. The measurement results show the bandwidth of 720 MHz, the side lobe level of 12.39 dB, the gain of more than 6 dBi around the frequency of 5.3 GHz, and the 3 dB axial ratio bandwidth of 200 MHz. It seems that the realized array antenna could produce wide bandwidth, low side lobe level, and circular polarization, so that it is suitable for WLAN application.

scholarly journals A New Linear Printed Vivaldi Antenna Array with Low Side Lobe Level and High Gain for the Band 3.5 GHz

2020 ◽  
Author(s):  
Luong Xuan Truong ◽  
Truong Vu Bang Giang ◽  
Tran Minh Tuan
Keyword(s):  
Antenna Array ◽  
Simulated Data ◽  
Bat Algorithm ◽  
Side Lobe ◽  
High Gain ◽  
Control Technique ◽  
Side Lobe Level ◽  
Low Sidelobe ◽  
Vivaldi Antenna ◽  
Vivaldi Antennas

This paper proposes a new design of low sidelobe level (SLL) and high gain linear printed Vivaldi antenna array. The array composes of two parts, which are a linear Vivaldi antenna array and a back reflector. The array consists of 10 single Vivaldi antennas and a series-fed network, those are based on Roger RO4003C substrate (ε = 3.55) with the dimension of 140 x 450 x 1.524 mm3. A new Bat algorithm with the amplitude-only control technique has been applied to optimize the output coefficients of the series-fed network for gaining a low SLL. The simulation results indicate that the proposed antenna provides a low SLL of -29.2 dB in E-plane with a high gain of 16.5 dBi at the frequency of 3500 MHz. A prototype of the proposed antenna array has been fabricated. The measured data has a good agreement with the simulated data.

scholarly journals Compact and High Gain 4 × 4 Circularly Polarized Microstrip Patch Antenna Array for Next Generation Small Satellite

2021 ◽  
Vol 11 (19) ◽  
pp. 8869
Author(s):  
Manzoor Elahi ◽  
Son Trinh-Van ◽  
Youngoo Yang ◽  
Kang-Yoon Lee ◽  
Keum-Cheol Hwang
Keyword(s):  
Antenna Array ◽  
Patch Antenna ◽  
Axial Ratio ◽  
High Gain ◽  
Microstrip Patch Antenna ◽  
Small Satellite ◽  
Next Generation ◽  
Circularly Polarized ◽  
Microstrip Patch ◽  
Left Handed

In this article, a high gain and compact 4 × 4 circularly polarized microstrip patch antenna array is reported for the data transmission of the next-generation small satellite. The radiating element of the circularly polarized antenna array is realized by the conventional model of the patch with truncated corners. A compact two-stage sequential rotational phase feeding is adopted that broadens the operating bandwidth of the 4 × 4 array. A small stub is embedded in the sequential rotational feed, which results in better performance in terms of the S-parameters and sequential phases at the output ports than sequential rotational feed without open stub. A prototype of the array is fabricated and measured. Fulfilling the application requirements of the next-generation small satellites, the array has the left-handed circularly polarized gain of more than 12 dBic with the axial ratio level below 1.5 dB in the ±10∘ angular space with respect to the broadside direction for the whole bandwidth from 8.05 GHz to 8.25 GHz. Moreover, the left-handed circularly polarized gain varies from 15 to 15.5 dBic in the desired band. The radiation patterns are measured; both the co- and X-pol are validated.

scholarly journals A Millimeter-Wave Wideband Circularly Polarized Planar Spiral Antenna Array with Unequal Amplitude Feeding Network

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Huakang Chen ◽  
Yu Shao ◽  
Zhangjian He ◽  
Changhong Zhang ◽  
Zhizhong Zhang
Keyword(s):  
Antenna Array ◽  
Millimeter Wave ◽  
Printed Circuit Board ◽  
Low Cost ◽  
Axial Ratio ◽  
Circuit Board ◽  
Impedance Bandwidth ◽  
Side Lobe Level ◽  
Archimedean Spiral ◽  
Circularly Polarized

A 2 × 2 wideband circularly polarized (CP) antenna array operating at millimeter wave (mmWave) band is presented. The array element is a wideband CP Archimedean spiral radiator with special-shaped ring slot. The elements are fed by an unequal amplitude (UA) feeding network based on a microstrip line (MSL) power divider. The side lobe level is improved by this UA feeding network. In addition, a cross slot is employed to isolate the elements for decoupling. A prototype is fabricated, and the measured results show that the proposed array achieves an impedance bandwidth (IBW) of 6.31 GHz (22.5% referring to 28 GHz) and an axial ratio bandwidth (ARBW) of 7.32 GHz (26.1% referring to 28 GHz). The peak gain of the proposed array is 11.3 dBic, and the gain is greater than 9.3 dBic within the whole desired band (from 25 GHz to 31 GHz). The proposed array consists of only one substrate layer and can be built by the conventional printed circuit board technology. Attributed to the characteristics of wide bandwidth, simple structure, low profile, and low cost, the proposed antenna array has a great potential in mmWave wireless communications.

Gain enhancement of wideband circularly polarized antenna using FSS

2016 ◽  
Vol 9 (3) ◽  
pp. 697-703 ◽  
Author(s):  
Nagendra Kushwaha ◽  
Raj Kumar
Keyword(s):  
Coplanar Waveguide ◽  
Axial Ratio ◽  
Frequency Selective Surface ◽  
High Gain ◽  
Unit Element ◽  
Impedance Bandwidth ◽  
Circularly Polarized ◽  
Gain Enhancement ◽  
Antenna Performance ◽  
Measured Impedance

This paper presents a high gain, wideband circularly polarized (CP) antenna. High gain of the antenna is achieved by employing a frequency selective surface (FSS) as a reflector. The antenna is a coplanar waveguide-fed structure with a modified L-shaped radiating patch. The unit element of the FSS is formed by connecting two modified dipoles at an angle of 90°. The antenna with reflector has a measured impedance bandwidth of 74.3% (2.2–4.8 GHz) and a 3-dB axial ratio bandwidth (ARBW) of 62% (2.2–4.18 GHz). The maximum boresight gain of the proposed antenna with reflector is 7.1 dB at 3.4 GHz. The radiation patterns of the antenna with the FSS are also measured and compared with simulated patterns. The various aspects of effect of FSS on CP antenna performance are also discussed.

scholarly journals Metallic Reflector-Based X-Band Circularly Polarized Hollow Dielectric Resonator Antenna for High Gain in UWB Applications

2021 ◽  
Author(s):  
SACHIN KUMAR YADAV ◽  
Amanpreet Kaur ◽  
Rajesh Khanna
Keyword(s):  
Circular Polarization ◽  
Dielectric Resonator ◽  
Near Field ◽  
Axial Ratio ◽  
High Gain ◽  
Impedance Bandwidth ◽  
Dielectric Resonator Antenna ◽  
Circularly Polarized ◽  
X Band ◽  
Peak Gain

Abstract A circularly polarized hollow dielectric resonator antenna (CPHDRA) is designed for X-band applications. Rectangular dielectric resonator (RDR) is used as a radiator element, fed by a quarter-wave transformer (QWT) feedline. By performance of the RDR antenna, an air cylindrical rod structure is extracted from RDR to enhance the gain and impedance bandwidth. Two parasitic strips are placed on the top of the RDR to achieve circular polarization with reported ≤ 3-dB axial ratio (AR) bandwidth for X-band applications. In this article, UWB antenna covers range from 2.74 to 10.4GHz by using asymmetrical defective ground structure (DGS). In near field of the dielectric resonator, three different radiating modes namely HE11δ, HE21δ, HE23δ, and HE32δ are at 4.4, 6, 8.8, and 9.9 GHz. For the generation of circular polarization (CP), two orthogonal modes are generated at 8.8 and 9.9 GHz as per XZ and YZ planes. It has reported 23.8 % (8 to 10.1 GHz) of 3-dB AR bandwidth. The simulated and measured impedance bandwidths are 118.46 % and 121.12 % along with a peak gain of 6.55 dB without the use of a metallic reflector. By using a metallic reflector suspended in the bottom side of the substrate with a distance of 13.1mm is reported along with the peak gain of 9.8 dBi.

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