Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
Telecommunications and Radio Engineering
SJR: 0.202 SNIP: 0.2 CiteScore™: 0.23

ISSN Imprimer: 0040-2508
ISSN En ligne: 1943-6009

Volumes:
Volume 78, 2019 Volume 77, 2018 Volume 76, 2017 Volume 75, 2016 Volume 74, 2015 Volume 73, 2014 Volume 72, 2013 Volume 71, 2012 Volume 70, 2011 Volume 69, 2010 Volume 68, 2009 Volume 67, 2008 Volume 66, 2007 Volume 65, 2006 Volume 64, 2005 Volume 63, 2005 Volume 62, 2004 Volume 61, 2004 Volume 60, 2003 Volume 59, 2003 Volume 58, 2002 Volume 57, 2002 Volume 56, 2001 Volume 55, 2001 Volume 54, 2000 Volume 53, 1999 Volume 52, 1998 Volume 51, 1997

Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v77.i2.10
pages 95-112

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

V. V. Ovsyanikov
Oles Honchar Dnipro National University 72, Gagarin Av., Dnipro, 49010, Ukraine

RÉSUMÉ

The results of a theoretical and experimental study of distribution of the complex current amplitude, input impedances, voltage standing wave ratio, and the directional patterns of multifrequency and two-frequency linear microwave wire antennas with quarter-wave coaxial or two-wire shunts and with concentrated reactive loads are presented. As the result of the research it was determined that at a constant size of a quarter-wave shunt attached to the antenna and at different antenna dimensions with respect of the shunt, the antenna can either 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 in the upper frequency range the multifrequency mode is obeyed. Otherwise, the multifrequency mode is not respected. The principle of eliminating the above-mentioned drawback and creation of two-frequency antennas for operation with an arbitrary ratio of the compatible frequencies is suggested and experimentally tested. This principle consists in adjusting the electrical length of the wire rod of the antenna that protrudes beyond the shunt by serial connection of the concentrated reactive load into its gap, the value of which must satisfy two conditions–creation of the maximum potential difference in the aperture of the shunt at the upper operating frequency and ensuring the mode of the serial 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 impedances, VSWR and directional patterns of similar antennas, as well as the values of inductive loads calculated according to the suggested expression and connected into the protruding part of the antenna rod outside the shunt. The proposed method for calculating and optimizing two-frequency antennas for operation 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 connected inductive loads, is one of the promising options for development of the small-size two-frequency antennas and antenna arrays in the microstrip execution.


Articles with similar content:

BROADBAND ANTENNAS AND ANTENNA ARRAYS WITH REACTIVE LOADS
Telecommunications and Radio Engineering, Vol.77, 2018, issue 13
V. V. Ovsyanikov, E. R. Beznosova
ANTENNAS WITH STEERABLE DIRECTIONAL PATTERNS
Telecommunications and Radio Engineering, Vol.77, 2018, issue 7
V. V. Ovsyanikov
OUTPUT, SIGNAL AND NOISE PARAMETERS OF AUTODYNES WITH A RIGID CONDUCTANCE CHARACTERISTIC OF AN ACTIVE ELEMENT
Telecommunications and Radio Engineering, Vol.75, 2016, issue 20
S. M. Smolskiy, D.Ya. Mishin, K. A. Ignatkov, G. P. Ermak, A. P. Chupahin, A.V. Vasiliev, V. Ya. Noskov
Analysis and Optimization of a Quasioptical Waveguide-based Microcompact Testing Range for Submillimeter Waves
Telecommunications and Radio Engineering, Vol.53, 1999, issue 3
V. K. Kiseliov
VOLT-AMPERE CHARACTERISTIC AND EXTERNAL INDUCED CURRENT IN AVALANCHE-GENERATOR DIODES WITH REVERSE-BIASED ABRUPT JUNCTIONS
Telecommunications and Radio Engineering, Vol.75, 2016, issue 12
P. P. Maksymov, K. A. Lukin