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ANALYSIS OF CHARACTERISTICS OF TWO-FREQUENCY (THREE-FREQUENCY) ANTENNAS WITH REACTIVE LOADS

heading: 
MICROWAVE AND TERAHERTZ TECHNOLOGY
Ovsyanikov, VV
Organization: 

Oles Honchar Dnipro National University
72, Gagarin Avenue, Dniprj (Dnipropetrovsk), 49010, Ukraine
E-mail: ovsyan37@i.ua
https://doi.org/10.15407/rej2017.03.047
Language: Russian
Abstract: 

The results of a theoretical and experimental study of the distribution of the amplitude of a complex current, input resistances, the standing wave voltage coefficient, and the directional patterns of multifrequency and two-frequency linear microwave wire antennas with quarter-wave coaxial, two-wire shunts and with concentrated reactive loads are presented. As a result of the research, it was found that with a constant size of a quarter-wave shunt attached to the antenna and with different sizes of the antenna relative to the shunt, it can acquire or lose the multifrequency property. Namely, with the length of the wire rod protruding beyond the shunt equal to an odd number of quarters of the short wave of the upper frequency range the multifrequency mode is observed. Otherwise, the multifrequency mode is not respected. The principle of eliminating the drawback noted above and the creation of two-frequency antennas for working with an arbitrary ratio of co-placed frequencies is proposed and tested experimentally. This principle consists in adjusting the electrical length of the wire rod of the antenna that protrudes beyond the shunt by sequentially including a concentrated reactive load in its rupture, the value of which must satisfy two conditions. Namely, the condition for creating the maximum potential difference in the opening of the shunt at the upper operating frequency and the condition for ensuring the mode of successive resonance of the antenna at the lower operating frequency. The results of the research are presented in the form of tables and graphs of current distribution, input resistances, VSWR and directional patterns of similar antennas, as well as the values of inductive loads calculated according to the proposed expression and included in the protruding part of the antenna rod outside the shunt. The proposed method for calculating and optimizing two-frequency antennas for working with an arbitrary ratio of compatible frequencies was experimentally tested. It is noted that the investigated two-frequency antenna with two-wire linear shunts and with included inductive loads, is one of the promising options for the development of small-size dual-frequency antennas and antenna arrays in microstrip performance.
Keywords: distribution of the amplitude of the complex current on the antenna, inductive load, standing wave ratio by voltage, the input impedance of the antenna, two-frequency antenna with shunts

Manuscript submitted 17.05.2017
PACS 84.40. Ba
Radiofiz. elektron. 2017, 22(3): 47-57

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