An X-band Wide Beamwidth CP Antenna Design with Extended Structure of Dielectric Substrate*

2019 ◽  
Author(s):  
Hong Jing ◽  
Wenxi Hao ◽  
Hui Ning ◽  
Zijian Zong
Keyword(s):  
Dielectric Substrate ◽  
Antenna Design ◽  
Extended Structure ◽  
X Band

scholarly journals Microstrip Antenna Design for Femtocell Coverage Optimization

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Afaz Uddin Ahmed ◽  
M. T. Islam ◽  
Rezaul Azim ◽  
Mahamod Ismail ◽  
Mohd Fais Mansor
Keyword(s):  
Microstrip Antenna ◽  
Dielectric Substrate ◽  
Antenna Design ◽  
Data Link ◽  
Network Layer ◽  
Coverage Optimization ◽  
Physical Data ◽  
Femtocell Network ◽  
Network Interference

A mircostrip antenna is designed for multielement antenna coverage optimization in femtocell network. Interference is the foremost concern for the cellular operator in vast commercial deployments of femtocell. Many techniques in physical, data link and network-layer are analysed and developed to settle down the interference issues. A multielement technique with self-configuration features is analyzed here for coverage optimization of femtocell. It also focuses on the execution of microstrip antenna for multielement configuration. The antenna is designed for LTE Band 7 by using standard FR4 dielectric substrate. The performance of the proposed antenna in the femtocell application is discussed along with results.

Computer-Automated Evolution of an X-Band Antenna for NASA's Space Technology 5 Mission

2011 ◽  
Vol 19 (1) ◽  
pp. 1-23 ◽  
Author(s):  
Gregory. S. Hornby ◽  
Jason D. Lohn ◽  
Derek S. Linden
Keyword(s):  
Evolutionary Algorithms ◽  
Domain Knowledge ◽  
Current Practice ◽  
Design Space ◽  
Fitness Function ◽  
Antenna Design ◽  
Space Technology ◽  
X Band ◽  
Spacecraft Orbit

Whereas the current practice of designing antennas by hand is severely limited because it is both time and labor intensive and requires a significant amount of domain knowledge, evolutionary algorithms can be used to search the design space and automatically find novel antenna designs that are more effective than would otherwise be developed. Here we present our work in using evolutionary algorithms to automatically design an X-band antenna for NASA's Space Technology 5 (ST5) spacecraft. Two evolutionary algorithms were used: the first uses a vector of real-valued parameters and the second uses a tree-structured generative representation for constructing the antenna. The highest-performance antennas from both algorithms were fabricated and tested and both outperformed a hand-designed antenna produced by the antenna contractor for the mission. Subsequent changes to the spacecraft orbit resulted in a change in requirements for the spacecraft antenna. By adjusting our fitness function we were able to rapidly evolve a new set of antennas for this mission in less than a month. One of these new antenna designs was built, tested, and approved for deployment on the three ST5 spacecraft, which were successfully launched into space on March 22, 2006. This evolved antenna design is the first computer-evolved antenna to be deployed for any application and is the first computer-evolved hardware in space.

scholarly journals NESTED CIRCULAR ELLIPTICAL SHAPED MIXED LOOP RESONATOR BASED BANDPASS FILTER FOR MICROWAVE APPLICATIONS / PENAPIS JALUR BERASASKAN CAMPURAN GEGELUNG PENYALUN BERBENTUK SARANG BULAT UNTUK APLIKASI GELOMBANG MIKRO

2020 ◽  
Vol 82 (2) ◽  
Author(s):  
Mohammad Rashed Iqbal Farque ◽  
Md. Jubaer Alam ◽  
Muhamad Roszaini Roslan ◽  
Mohammad Tariqul Islam
Keyword(s):  
Refractive Index ◽  
Relative Permittivity ◽  
Bandpass Filter ◽  
Dielectric Substrate ◽  
Simulation Software ◽  
Double Negative ◽  
Scattering Parameters ◽  
Current Distributions ◽  
X Band ◽  
Microwave Applications

An elliptical thumb printed nested circular mixed loop resonator (MLR) is introduced in this article to design a multiple bandpass filter for microwave applications. The proposed structure is composed of a series of loop resonators on a Rogers RT-5880 dielectric substrate, where the overall system is developed into a 377Ω framework. Similar structure is designed on both sides of the substrate and an investigation is made on scattering parameters, relative permittivity, permeability, refractive index and current distributions. The 12 ´ 14 mm2 structure is designed and evaluated by a simulation software CST microwave studio and the metamaterial characteristics have been classified by Nicolson-Ross-Weir method at the filtering frequencies. The proposed filter shows resonances at 2.65 GHz, 5.85 GHz, 7.12 GHz, and 8.59 GHz, and the measured results are compared with the simulated ones. With a favorable design and double-negative characteristics, this design is suitable for multiple bandpass filter particularly for S, C, and X-band applications.

Compact Dual-Band Proximity-Fed Circularly Polarized Patch Antenna for BDS Applications

Frequenz ◽  
2015 ◽  
Vol 69 (9-10) ◽  
Author(s):  
Jianxing Li ◽  
Bin He ◽  
Jing Fang ◽  
Anxue Zhang
Keyword(s):  
Patch Antenna ◽  
Branch Length ◽  
Axial Ratio ◽  
Dielectric Substrate ◽  
Satellite System ◽  
Antenna Design ◽  
Dual Band ◽  
Antenna Aperture ◽  
Small Surface ◽  
Circularly Polarized

AbstractThis paper presents a compact dual-band proximity-fed circularly polarized (CP) patch antenna for BeiDou Navigation Satellite System (BDS) operation at B1 (1,561 MHz) and B3 (1,268 MHz) bands. The antenna aperture is minimized down to 26.6 mm (λ/9 at the B3 band) in diameter and 12 mm (λ/20 at the B3 band) in thickness using high permittivity dielectric substrate and meandered slots. The antenna design features that the resonant frequency in the higher band could be tuned independently by adjusting the branch length and breadth without affecting the lower band. To achieve right-handed CP (RHCP) radiation property, quadrature phase feeding is employed together with a broadband 0°–90° hybrid utilizing a small surface mount LTCC hybrid coupler chip. Experimental results show that the RHCP gain maintains larger than 1.5 dBic and the axial ratio (AR) stays below 3 dB within the B1 and B3 bands. This antenna design is a promising candidate for small BDS arrays as well as other dual-band BDS applications.

scholarly journals DEVELOPMENT AND OPTIMIZATION OF AN ULTRA WIDEBAND MINIATURE MEDICAL ANTENNA FOR RADIOMETRIC MULTI-CHANNEL MULTI-FREQUENCY THERMAL MONITORING

2020 ◽  
pp. 71-81
Author(s):  
Mikhail Sedankin ◽  
Vitaly Leushin ◽  
Alexander Gudkov ◽  
Igor Sidorov ◽  
Sergey Chizhikov ◽  
...  
Keyword(s):  
Radiation Power ◽  
Fdtd Method ◽  
Depth Resolution ◽  
Wide Band ◽  
Biological Tissues ◽  
Dielectric Substrate ◽  
Ultra Wideband ◽  
Antenna Design ◽  
Design Parameters ◽  
Calculated Mass

The article is devoted to the development of a printed ultra-wideband miniature antenna that can be used for microwave radiometry. An antenna design with a ring-shaped radiator has been proposed, which provides reception of microwave radiation from biological tissues in the 1800–4600 MHz range. The results of mathematical modeling of the antenna electromagnetic field in biological tissues using the finite difference time domain (FDTD) method are presented. Optimization of the antenna design has been carried out to ensure acceptable matching parameters and optimal antenna functionality. The developed antenna has a height of 6 mm and a calculated mass of 5 g; it is planned to manufacture a dielectric substrate based on PDMS polymer with the addition of barium titanate. The issues of calculating the antenna parameters (measurement depth, resolution and distribution of radiation power over the volume of biological tissue, sensitivity, etc.) are considered. The research results and design parameters of the developed antenna demonstrated the effectiveness of the new antenna and the possibility of its adaptation to the object of research. Considering the presence of an ultra-wide band and miniature dimensions, the antenna can be a sensor of a multi-frequency multi-channel microwave radiothermograph

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