scholarly journals Frequency shift of the minimal magnitude of reflection coefficient in antenna array

2019 ◽  
Vol 70 (1) ◽  
pp. 64-68
Author(s):  
Ferdinand Vavrík ◽  
Jozef Hallon
Keyword(s):  
Reflection Coefficient ◽  
Frequency Shift ◽  
Frequency Dependence ◽  
Antenna Arrays ◽  
Near Field ◽  
Field Region ◽  
Absolute Value ◽  
Mutual Impedance ◽  
Circular Arrays ◽  
Circular Antenna Arrays

Abstract The paper present a study of frequency shift of the reflection coefficient minimal absolute value dependence on antenna spacing in linear and circular arrays. The spacing of CB-band monopole antenna was in the range of 0.015 to 0.12 multiples of the antenna working wavelength. Number of elements in the antenna arrays ranged from two to four. Frequency dependence of minimal absolute value of the reflection coefficient was obtained by simulations and also experimentally confirmed in anechoic chamber. The research showed two facts. First, mutual impedance has the higher impact when antenna spacing is comparable with the reactive near field region. Second, circular antenna arrays are a better choice in applications for a small number of antennas with that spacing.

scholarly journals Reconfigurable Antenna Arrays with Phase-only Control in the Presence of Near-field Nulls

2017 ◽  
pp. 88-93 ◽  
Author(s):  
Giulia Buttazzoni ◽  
Roberto Vescovo
Keyword(s):  
Iterative Method ◽  
Antenna Arrays ◽  
Strong Field ◽  
Near Field ◽  
A Priori ◽  
Excitation Amplitude ◽  
Array Element ◽  
Reconfigurable Antenna ◽  
Field Region ◽  
Arbitrary Geometry

In this paper an effective iterative method is presented for the power synthesis of reconfigurable antenna arrays. The algorithm is suitable for arrays of arbitrary geometry, including the case where a large number of elements is involved. The reconfigurability is achieved by phase-only control, so that the excitation amplitude of each array element remains constant during the reconfiguration process. Such amplitudes may be different from one array element to the others, and they are not assigned a priori, but are optimized. Furthermore, the electric field is imposed to vanish in a number of prescribed points of the near-field region, so that a strong field reduction is obtained in a neighborhood of them.

scholarly journals Design of CCAA for Optimized Difference Patterns

2020 ◽  
Vol 9 (8) ◽  
pp. 613-617
Keyword(s):  
Target Tracking ◽  
Target Detection ◽  
Antenna Arrays ◽  
Circular Arrays ◽  
Low Sidelobe ◽  
Concentric Circular Arrays ◽  
Circular Antenna Arrays

Difference patterns find applications in target tracking radars for accurate target detection. Such patterns must be generated with minimum sidelobe levels to reduce the effect of interfering signals like clutter, jamming signals. The present work is focused on designing concentric circular arrays(CCA) of practical elements producing low sidelobe difference patterns using thinning. Simulated results are presented for 6 ring and 7 ring concentric circular antenna arrays.

Synthesis and Implementation (In STM8S) of Phased Circular Antenna Arrays Using Taguchi Method

2016 ◽  
Vol 6 (3) ◽  
pp. 1077
Author(s):  
Nadhem Nemri ◽  
Hani Wadie Badri ◽  
Ridha Ghayoula ◽  
Hichem Trabelsi ◽  
Ali Gharsallah
Keyword(s):  
Taguchi Method ◽  
Antenna Arrays ◽  
Control Strategy ◽  
Intelligent System ◽  
Smart Antenna ◽  
Phase Shifters ◽  
Taguchi’S Method ◽  
Circular Arrays ◽  
Circular Antenna Arrays ◽  
Circular Antenna Array

<span lang="EN-US">This paper is aimed at assessing the effectiveness of the phase-only control strategy based on a customized Taguchi method when applied to Uniform Circular Arrays (UCA).  The objective of this paper consists to contribute the main lobe optimization of the smart antenna using Taguchi's method. We used the cited method in order to determine phase's weights for each element of the circular antenna array in order to steer the principal lobe from -65° to 65° covering all angular space. After that, we made an electronic platform using the microcontroller STM8S in order to implement an intelligent system. The architecture of this work had used a digital phase shifters, a demodulator AD8347, a modulator AD8349, an array antenna, cards STM8S-Discovery.</span>

scholarly journals Synthesis and Implementation (In STM8S) of Phased Circular Antenna Arrays Using Taguchi Method

2016 ◽  
Vol 6 (3) ◽  
pp. 1077
Author(s):  
Nadhem Nemri ◽  
Hani Wadie Badri ◽  
Ridha Ghayoula ◽  
Hichem Trabelsi ◽  
Ali Gharsallah
Keyword(s):  
Taguchi Method ◽  
Antenna Arrays ◽  
Control Strategy ◽  
Intelligent System ◽  
Smart Antenna ◽  
Phase Shifters ◽  
Taguchi’S Method ◽  
Circular Arrays ◽  
Circular Antenna Arrays ◽  
Circular Antenna Array

<span lang="EN-US">This paper is aimed at assessing the effectiveness of the phase-only control strategy based on a customized Taguchi method when applied to Uniform Circular Arrays (UCA).  The objective of this paper consists to contribute the main lobe optimization of the smart antenna using Taguchi's method. We used the cited method in order to determine phase's weights for each element of the circular antenna array in order to steer the principal lobe from -65° to 65° covering all angular space. After that, we made an electronic platform using the microcontroller STM8S in order to implement an intelligent system. The architecture of this work had used a digital phase shifters, a demodulator AD8347, a modulator AD8349, an array antenna, cards STM8S-Discovery.</span>

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