UDC 621.396. 677

AN APERTURE’S AMPLITUDE-PHASE DISTRIBUTION FOR A FORMING FREQUENCY-INDEPENDENT RADIATION CHARACTERISTICS OF A LINEAR ANTENNA ARRAYS

 
N. I. Bobkov ¹, D. D. Gabriel’an ², Yu. V. Ivanov ³ 

¹SC “VNII “Gradient”, Sokolova st., 96, Rostov-on-Don 344010, Russia

² “Federal research and production center RNIIRS”, Nansena st., 130, Rostov-on-Don 344038, Russia

³ «Moscow technical university of communication and informatization», Aviamotornaya st., 8-à, Moscow 111024, Russia

 

The paper is received on February 6, 2019

 

Abstract. An amplitude-phase distribution of the aperture field of a linear antenna array is proposed, which ensures the formation of frequency-independent radiation characteristics in a wide frequency band. Maintaining a constant width and shape of the radiation pattern in the frequency band is accomplished by introducing an additional frequency-dependent quadratic phase distribution, in which the decrease in the width of the radiation pattern with increasing frequency is compensated by an increase in the aperture’s dephasing. For this distribution, a representation of the radiation pattern is obtained as the sum of partial diagrams corresponding to the components of the aperture’s amplitude distribution. The main regularities of the formation of frequency-independent radiation patterns are analyzed in the frequency band with an 8: 1 overlap. It has been established that when a wide radiation pattern formed by an antenna array with a small number of emitters, in the high-frequency region there are distortions of the shape of the main lobe as oscillations. This effect is due to the high rate of change in the phase distribution of the currents in the array’s aperture, when the excitation phase difference adjacent emitters at the periphery of the array exceeds 180°.

 The following regularities were revealed:

- the amplitude distribution of the currents in the aperture is frequency-independent;
- the frequency dependence of the change in the phase aperture’s distribution of the array has a nearly linear character;

- the minimum number of array elements increases as the expansion of the working frequency band, and the formation of wider frequency-independent radiation patterns;
- the width of the frequency-independent radiation patterns, as in the case of the common-mode distribution, is determined by the inversely proportional dependence on the size of the aperture.

Keywords: linear antenna array, aperture, amplitude-phase distribution, radiation pattern.

References

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For citation:

N. I. Bobkov, D. D. Gabriel’an, Yu. V. Ivanov. Aperture's amplitude-phase distribution for the formation of frequency-independent radiation characteristics of linear antenna arrays. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2019. No. 2. Available at http://jre.cplire.ru/jre/feb19/15/text.pdf
DOI  10.30898/1684-1719.2019.2.15