ULTRA WIDEBAND RADIATOR WITH A STABLE PHASE CENTER FOR A REFLECTOR ANTENNA

2020 ◽  
Author(s):  
Д.В. БОСОМЫКИН ◽  
А.П. ВОРОНЦОВ ◽  
И.В. ПРИЩЕПА ◽  
А.А. ГАВРИЛОВ ◽  
А.В. ПРОРЕШКИН ◽  
...  
Keyword(s):  
Frequency Ratio ◽  
Reflector Antenna ◽  
Antenna System ◽  
Ultra Wideband ◽  
Stable Phase ◽  
Orthogonal Polarization ◽  
Phase Center ◽  
Directional Characteristics ◽  
Hybrid Coupler ◽  
Vivaldi Antenna

Предложен широкополосный излучатель со стабильным фазовым центром (ФЦ) для использования в составе облучателя зеркальной антенны. Излу ортогональных поляризациях и круговой поляризации при использовании квадратурного питания. Рабочая полоса по уровню КстU ≤ 2 обеспечивается при коэффициенте перекрытия по частоте более 1:16. Исследованы характеристики направленности облучателя зеркальной антенны на базе антенны типа Вивальди, представлены результаты расчетов и измерений его параметров. Обоснована пригодность для использования в составе облучателя сверхширокополосной зеркальной антенной системы в режиме суммарного и разностного формирования диаграммы направленности (ДН). It is presented the wideband irradiator with a stable phase center for use in a reflector antenna irradiator. The irradiator is based on a smoothly expanding slot. It has two coaxial feeds to form dual linear orthogonal polarization. Circular polarization radiation can be achieved with an additional hybrid coupler. The VSWR≤2 bandwidth is obtained for a frequency ratio of more than 1:16. The directional characteristics of the irradiator of a reflector antenna based on a Vivaldi antenna are investigated, the results of calculations and measurements of its parameters are presented. The suitability of the irradiator for use as a part of the irradiator of the ultra-wideband reflector antenna system is justified.

scholarly journals Optimization of the UWB Feed Antenna Position in Reflector Applications

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Nurhan Türker Tokan
Keyword(s):  
High Performance ◽  
Phase Error ◽  
Design Procedure ◽  
Reflector Antenna ◽  
Slot Antenna ◽  
Stable Phase ◽  
Phase Center ◽  
Center Position ◽  
Reflector System ◽  
Novel Method

In reflector system design, achieving high stability of phase center position with changes in frequency in reflector feed antennas is highly desired. However, obtaining highly stable phase center is not possible for UWB feed antennas, specially for planar ones. Thus, an optimum positioning for the UWB feed antenna should be defined. Optimization of the positioning of the feed antenna is essential since this process lowers resulting phase error losses significantly. In this work, a novel method for optimizing the UWB feed position of a prime focus reflector antenna from phase and amplitude recordings of the measured radiated field is introduced. An automatic and fast design procedure, based on Genetic Algorithms, is described. The proposed methodology has been numerically and experimentally assessed. The procedure is introduced by an application example to one of the most commonly used UWB feed antennas in high-performance reflector antenna systems: Linear Tapered Slot Antenna (LTSA). A LTSA antenna operating in 6–25 GHz frequency band is designed and manufactured. The performance of the method is quantified in terms of its phase error losses inE- andH-planes for reflector illumination.

scholarly journals Vivaldi Antenna Arrays Feed by Frequency-Independent Phase Shifter for High Directivity and Gain Used in Microwave Sensing and Communication Applications

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6091
Author(s):  
Jiwan Ghimire ◽  
Feyisa Debo Diba ◽  
Ji-Hoon Kim ◽  
Dong-You Choi
Keyword(s):  
Antenna Arrays ◽  
Phase Shifter ◽  
Antenna System ◽  
Phase Shifters ◽  
Ultra Wideband ◽  
Feed System ◽  
Power Splitter ◽  
Frequency Independent ◽  
Vivaldi Antenna ◽  
The Right

This paper describes a novel feed system for compact, wideband, high gain six-slot Vivaldi antenna arrays on a single substrate layer using a unique combination of power splitters based on binary T-junction power splitter topology, frequency-independent phase shifter, and a T-branch. The proposed antenna system consists of six Vivaldi antennas, three on the left, and three on the right arm. Each arm connects with T-junction power divider splitter topology, given that the right arm is linked through a frequency-independent phase shifter. Phase shifters ensure that the beam is symmetrical without splitting in a radiating plane so that highly directive radiation patterns occur. The optimal return losses (S-parameters) are well enriched by reforming Vivaldi’s feeding arms and optimizing Vivaldi slots and feeds. A novel feature of our design is that the antenna exhibits the arrangements of a T-junction power splitter with an out-of-phase feeding mechanism in one of the arms, followed by a T-branching feeding to even arrays of proper Vivaldi antenna arrangement contributing high realized gain and front-to-back ratio up to 14.12 dBi and 23.23 dB respectively applicable for not only ultra-wideband (UWB) application, also for sensing and position detecting. The high directivity over the entire UWB frequency band in both higher and lower frequency ranges ensures that the antenna can be used in microwave through-wall imaging along with resolution imaging for ground penetration radar (GPR) applications. The fabricated antenna parameters are in close agreement with the simulated and measured results and are deployed for the detection of targets inside the voids of the concrete brick.

Cuboidal quad-port UWB-MIMO antenna with WLAN rejection using spiral EBG structures

2021 ◽  
pp. 1-8
Author(s):  
Sumon Modak ◽  
Taimoor Khan
Keyword(s):  
Close Agreement ◽  
Ground Plane ◽  
Antenna System ◽  
Ultra Wideband ◽  
Electromagnetic Bandgap ◽  
Mimo Antenna ◽  
Simulated Performance ◽  
Notched Band ◽  
Multiple Input ◽  
Band Characteristic

Abstract This study presents a novel configuration of a cuboidal quad-port ultra-wideband multiple-input and multiple-output antenna with WLAN rejection characteristics. The designed antenna consists of four F-shaped elements backed by a partial ground plane. A 50 Ω microstrip line is used to feed the proposed structure. The geometry of the suggested antenna exhibits an overall size of 23 × 23 × 19 mm3, and the antenna produces an operational bandwidth of 7.6 GHz (3.1–10.7 GHz). The notched band characteristic at 5.4 GHz is accomplished by loading a pair of spiral electromagnetic bandgap structures over the ground plane. Besides this, other diversity features such as envelope correlation coefficient, and diversity gain are also evaluated. Furthermore, the proposed antenna system provides an isolation of −15 dB without using any decoupling structure. Therefore, to validate the reported design, a prototype is fabricated and characterized. The overall simulated performance is observed in very close agreement with it's measured counterpart.

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