203 research outputs found
Broadside Dual-channel Orthogonal-Polarization Radiation using a Double-Asymmetric Periodic Leaky-Wave Antenna
The paper demonstrates that double unit-cell asymmetry in periodic leaky-wave
antennas (P-LWAs), i.e. asymmetry with respect to both the longitudinal and
transversal axes of the structure -- or longitudinal asymmetry (LA) and
transversal asymmetry (TA) -- allows for the simultaneous broadside radiation
of two orthogonal modes excited at the two ports of the antenna. This means
that the antenna may simultaneously support two orthogonal channels, which
represents an interesting polarization diversity characteristics for wireless
communications. The double asymmetric (DA) unit cell combines a circularly
polarized LA unit cell and a coupled mode TA unit cell, where the former
provides equal radiation in the series and shunt modes while the latter
separates these two modes in terms of their excitation ports. It is also shown
that the degree of TA in the DA unit cell controls the cross-polarization
discrimination level. The DA P-LWA concept is illustrated by two examples, a
series-fed line-connected patch (SF-LCP) P-LWA and a series-fed
capacitively-coupled patch (SF-CCP) P-LWA, via full-wave simulation and also
experiment for the SF-LCP P-LWA case
ΠΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ Π½ΠΎΠ²ΡΡ ΡΠ΅Ρ Π½ΠΈΡΠ΅ΡΠΊΠΈΡ ΡΠ΅ΡΠ΅Π½ΠΈΠΉ ΠΏΠΎ ΡΡΠΎΠ²Π΅ΡΡΠ΅Π½ΡΡΠ²ΠΎΠ²Π°Π½ΠΈΡ ΠΏΠΎΠ΄Π³ΠΎΡΠΎΠ²ΠΊΠΈ ΠΌΠ°ΡΠΈΠ½Π½ΡΡ ΠΊΠ»Π°ΡΡΠΎΠ² Π½Π° Π¦ΠΠ€ "Π§Π΅ΡΠ²ΠΎΠ½ΠΎΠ³ΡΠ°Π΄ΡΠΊΠ°Ρ"
ΠΠΈΠΊΠΎΠ½Π°Π½ΠΎ Π°Π½Π°Π»ΡΠ· ΡΡΠ½ΡΡΡΠΎΡ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΡΡ Ρ Π°ΠΏΠ°ΡΠ°ΡΡΡΠ½ΠΎΠ³ΠΎ ΠΎΡΠΎΡΠΌΠ»Π΅Π½Π½Ρ Π²ΡΠ·Π»Π° ΠΌΠΎΠΊΡΠΎΠ³ΠΎ ΠΏΡΠ΄Π³ΠΎΡΠΎΠ²ΡΠΎΠ³ΠΎ Π³ΡΠΎΡ
ΠΎΡΡΠ½Π½Ρ Π½Π° Π¦ΠΠ€ "Π§Π΅ΡΠ²ΠΎΠ½ΠΎΠ³ΡΠ°Π΄ΡΡΠΊΠ°".
ΠΠ°ΠΏΡΠΎΠΏΠΎΠ½ΠΎΠ²Π°Π½Ρ Π½ΠΎΠ²Ρ ΡΠ΅Ρ
Π½ΡΡΠ½Ρ ΡΡΡΠ΅Π½Π½Ρ ΠΏΠΎ ΡΠ΄ΠΎΡΠΊΠΎΠ½Π°Π»Π΅Π½Π½Ρ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΡΡ ΠΏΡΠ΄Π³ΠΎΡΠΎΠ²ΠΊΠΈ ΠΌΠ°ΡΠΈΠ½Π½ΠΈΡ
ΠΊΠ»Π°ΡΡΠ²: ΠΏΡΠΈΠ²βΡΠ·ΠΊΠ° Π°Π³ΡΠ΅Π³Π°ΡΠ½ΠΎ ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΈΡ
Π½Π΅ΡΡΡ
ΠΎΠΌΠΎΠ³ΠΎ Π³ΡΠ΄ΡΠΎΠ³ΡΠΎΡ
ΠΎΡΠ° ΠΠΠ-4,2 Ρ ΡΡΡ
ΠΎΠΌΠΎΠ³ΠΎ Π³ΡΠΎΡ
ΠΎΡΠ° ΠΠΠ‘Π’-72, Π° ΡΠ°ΠΊΠΎΠΆ Π·Π°ΡΡΠΎΡΡΠ²Π°Π½Π½Ρ ΠΊΠΎΠΌΠ±ΡΠ½ΠΎΠ²Π°Π½ΠΎΠ³ΠΎ Π³ΡΠ΄ΡΠΎΠ²ΡΠ±ΡΠ°ΡΡΠΉΠ½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΎΠ΄Π° ΡΠΎΠ·Π΄ΡΠ»Π΅Π½Π½Ρ ΡΠ°ΡΡΠΈΠ½ΠΎΠΊ Π½Π° ΡΡΡ
ΠΎΠΌΡΠΉ ΠΏΠΎΠ²Π΅ΡΡ
Π½Ρ.
ΠΡΠΈΠ²Π΅Π΄Π΅Π½ΠΎ ΠΎΠΏΠΈΡ Ρ ΠΏΠ΅ΡΠ΅Π²Π°Π³ΠΈ Π½ΠΎΠ²ΠΈΡ
ΡΠ΅Ρ
Π½ΡΡΠ½ΠΈΡ
ΡΡΡΠ΅Π½Ρ ΠΏΠΎ ΡΠ΄ΠΎΡΠΊΠΎΠ½Π°Π»Π΅Π½Π½Ρ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΡΡ ΠΏΡΠ΄Π³ΠΎΡΠΎΠ²ΠΊΠΈ ΠΌΠ°ΡΠΈΠ½Π½ΠΈΡ
ΠΊΠ»Π°ΡΡΠ² Π½Π° Π¦ΠΠ€ "Π§Π΅ΡΠ²ΠΎΠ½ΠΎΠ³ΡΠ°Π΄ΡΡΠΊΠ°".ΠΡΠΏΠΎΠ»Π½Π΅Π½ Π°Π½Π°Π»ΠΈΠ· ΡΡΡΠ΅ΡΡΠ²ΡΡΡΠ΅ΠΉ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΠΈ ΠΈ Π°ΠΏΠΏΠ°ΡΠ°ΡΡΡΠ½ΠΎΠ³ΠΎ ΠΎΡΠΎΡΠΌΠ»Π΅Π½ΠΈΡ ΡΠ·Π»Π° ΠΌΠΎΠΊΡΠΎΠ³ΠΎ ΠΏΠΎΠ΄Π³ΠΎΡΠΎΠ²ΠΈΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ Π³ΡΠΎΡ
ΠΎΡΠ΅Π½ΠΈΡ Π½Π° Π¦ΠΠ€ "Π§Π΅ΡΠ²ΠΎΠ½ΠΎΠ³ΡΠ°Π΄ΡΠΊΠ°Ρ".
ΠΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Ρ Π½ΠΎΠ²ΡΠ΅ ΡΠ΅Ρ
Π½ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ΅ΡΠ΅Π½ΠΈΡ ΠΏΠΎ ΡΠΎΠ²Π΅ΡΡΠ΅Π½ΡΡΠ²ΠΎΠ²Π°Π½ΠΈΡ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΠΈ ΠΏΠΎΠ΄Π³ΠΎΡΠΎΠ²ΠΊΠΈ ΠΌΠ°ΡΠΈΠ½Π½ΡΡ
ΠΊΠ»Π°ΡΡΠΎΠ²: ΠΏΡΠΈΠ²ΡΠ·ΠΊΠ° Π°Π³ΡΠ΅Π³Π°ΡΠ½ΠΎ ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½Π½ΡΡ
Π½Π΅ΠΏΠΎΠ΄Π²ΠΈΠΆΠ½ΠΎΠ³ΠΎ Π³ΠΈΠ΄ΡΠΎΠ³ΡΠΎΡ
ΠΎΡΠ° ΠΠΠ-4,2 ΠΈ ΠΏΠΎΠ΄Π²ΠΈΠΆΠ½ΠΎΠ³ΠΎ Π³ΡΠΎΡ
ΠΎΡΠ° ΠΠΠ‘Π’-72, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ ΠΊΠΎΠΌΠ±ΠΈΠ½ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ Π³ΠΈΠ΄ΡΠΎΠ²ΠΈΠ±ΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΎΠ΄Π° ΡΠ°Π·Π΄Π΅Π»Π΅Π½ΠΈΡ ΡΠ°ΡΡΠΈΡ Π½Π° ΠΏΠΎΠ΄Π²ΠΈΠΆΠ½ΠΎΠΉ ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠΈ.
ΠΡΠΈΠ²Π΅Π΄Π΅Π½ΠΎ ΠΎΠΏΠΈΡΠ°Π½ΠΈΠ΅ ΠΈ ΠΏΡΠ΅ΠΈΠΌΡΡΠ΅ΡΡΠ²Π° Π½ΠΎΠ²ΡΡ
ΡΠ΅Ρ
Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ΅ΡΠ΅Π½ΠΈΠΉ ΠΏΠΎ ΡΠΎΠ²Π΅ΡΡΠ΅Π½ΡΡΠ²ΠΎΠ²Π°Π½ΠΈΡ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΠΈ ΠΏΠΎΠ΄Π³ΠΎΡΠΎΠ²ΠΊΠΈ ΠΌΠ°ΡΠΈΠ½Π½ΡΡ
ΠΊΠ»Π°ΡΡΠΎΠ² Π½Π° Π¦ΠΠ€ "Π§Π΅ΡΠ²ΠΎΠ½ΠΎΠ³ΡΠ°Π΄ΡΠΊΠ°Ρ"
Axial ratio correction for GNSS antennas in asymetrically coupled environments
The paper demonstrates a technique to correct the axial ratio of dual-fed circularly-polarized antennas in the presence of strong coupling with surrounding components or asymmetrically reduced ground plane. It demonstrated - based on a standard GPS L1 patch antenna - that for certain situations a phase shift of up to 135Β° may be beneficial compared to the routinely used 90Β°, allowing for AR improvement from 7.8 dB (for 90Β°) to 2.1 dB (135Β°)
Electrically small antenna with switchless pattern reconfiguration
An electrically small pattern reconfigurable antenna is proposed. It allows adjustment of the radiation pattern by applying a phase shift between its two ports. The structure is a cylinder with Ξ»/5 diameter. Simulated results show good operation at 2.44 GHz and three different radiation patterns are demonstrated by applying three different phase shifts. The antenna\u27s principles of operation and limitations are explained based on the theory of spherical modes
ΠΠ²ΡΡ ΠΌΠ΅ΡΠ½ΠΎΠ΅ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠ½ΠΎΠ΅ ΠΏΠΎΠ»Π΅ Π² ΠΎΠ²Π°Π»ΡΠ½ΠΎΠΌ ΠΈΠ»ΠΈ ΡΡΠ°ΠΏΠ΅ΡΠ΅ΠΈΠ΄Π°Π»ΡΠ½ΠΎΠΌ ΠΏΠ°Π·Ρ ΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΌΠ°ΡΠΈΠ½Ρ
Π¨ΠΈΡΠΎΠΊΠΎΠΏΠΎΠ»ΠΎΡΠ½ΡΠΉ Π³Π΅Π½Π΅ΡΠ°ΡΠΎΡ ΡΠΈΠ½ΡΡΠΎΠΈΠ΄Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠΈΠ³Π½Π°Π»Π° Π΄Π»Ρ ΡΠΏΠ΅ΠΊΡΡΠΎΡΠΊΠΎΠΏΠΈΠΈ ΡΠ»Π΅ΠΊΡΡΠΎΡ ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈΠΌΠΏΠ΅Π΄Π°Π½ΡΠ°
ΠΠΎΠΊΠ°Π·Π°Π½Π° Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡ ΡΠ΅Π°Π»ΠΈΠ·Π°ΡΠΈΠΈ ΡΠΈΡΠΎΠΊΠΎΠΏΠΎΠ»ΠΎΡΠ½ΠΎΠ³ΠΎ Π³Π΅Π½Π΅ΡΠ°ΡΠΎΡΠ° ΡΠΈΠ½ΡΡΠΎΠΈΠ΄Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠΈΠ³Π½Π°Π»Π° ΠΏΠΎΡΡΠ΅Π΄ΡΡΠ²ΠΎΠΌ ΡΠΎΠ²ΠΌΠ΅ΡΠ΅Π½ΠΈΡ ΡΠΈΡΡΠΎΠ²ΠΎΠ³ΠΎ Π²ΡΡΠΈΡΠ»ΠΈΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠΈΠ½ΡΠ΅Π·Π°ΡΠΎΡΠ° ΠΈ ΡΠΈΡΡΠΎ-Π°Π½Π°Π»ΠΎΠ³ΠΎΠ²ΠΎΠ³ΠΎ ΠΏΡΠ΅ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°ΡΠ΅Π»Ρ
Lightweight and cost efficient spaceborn patch antenna
In order to achieve lightweight yet low cost antennas for use in a geostationary space environment, the GeReLEO-SMART project develops a substrate-based, multilayer antenna structure which can replace traditional horn antennas as feeds for reflector antennas. To verify a design, an example mission is developed, consisting of a 2Γ2 patch antenna array with an integrated stripline bandpass filter. The operation frequency is 25.935 GHz. This multilayer antenna will be tested on board of the German technology demonstration mission βHeinrich-Hertzβ (H2SAT). The design passed all tests for space qualification without decrease in performance
ΠΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΈΡΠΊΡΡΡΡΠ²Π΅Π½Π½ΠΎΠΉ Π½Π΅ΠΉΡΠΎΠ½Π½ΠΎΠΉ ΡΠ΅ΡΠΈ Π΄Π»Ρ ΠΊΠ»Π°ΡΡΠΈΡΠΈΠΊΠ°ΡΠΈΠΈ ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΠΉ Π² Π»Π΅Π³ΠΊΠΈΡ ΡΠ΅Π»ΠΎΠ²Π΅ΠΊΠ° Π½Π° ΡΠ½ΠΈΠΌΠΊΠ°Ρ ΠΊΠΎΠΌΠΏΡΡΡΠ΅ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΠΌΠΎΠ³ΡΠ°ΡΠ°
Easy-to-deploy LC-loaded dipole and monopole antennas for cubesat
This paper proposes a new approach to reduce weight and complexity of VHF/UHF cubesat antennas by utilizing a dual band antenna, rather than standard two-antenna system routinely implemented in cubesats. Three systems are compared: A standard system with separate transmit/receive dipoles, a dual-band dipole for both transmit and receive and a dual-band monopole, which uses the body of 1U cubesat (10 Γ 10 Γ 10cm) as a βgroundplaneβ. Additionally it is demonstrated that with appropriate feed the dipole might be used in monopole configuration in case of deployment system malfunction
ΠΠ΄Π°ΠΏΡΠΈΠ²Π½Π°Ρ ΠΈΠ΄Π΅Π½ΡΠΈΡΠΈΠΊΠ°ΡΠΈΡ ΠΈ ΠΈΠ½ΡΠ΅ΡΠΏΡΠ΅ΡΠ°ΡΠΈΡ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠ² Π³Π°Π·ΠΎΠ³ΠΈΠ΄ΡΠΎΠ΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΈΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ ΡΠΊΠ²Π°ΠΆΠΈΠ½
ΠΠ°ΡΡΠΎΡΡΠ°Ρ Π½Π°ΡΡΠ½ΠΎ-ΠΊΠ²Π°Π»ΠΈΡΠΈΠΊΠ°ΡΠΈΠΎΠ½Π½Π°Ρ ΡΠ°Π±ΠΎΡΠ° ΠΏΠΎΡΠ²ΡΡΠ΅Π½Π° Π°ΠΊΡΡΠ°Π»ΡΠ½ΠΎΠΉ Π·Π°Π΄Π°ΡΠ΅ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠΈ ΠΈ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ Π½ΠΎΠ²ΡΡ
ΠΌΠΎΠ΄Π΅Π»Π΅ΠΉ ΠΈ Π°Π»Π³ΠΎΡΠΈΡΠΌΠΎΠ² Π°Π΄Π°ΠΏΡΠΈΠ²Π½ΠΎΠΉ ΠΈΠ΄Π΅Π½ΡΠΈΡΠΈΠΊΠ°ΡΠΈΠΈ Π³Π°Π·ΠΎΠ³ΠΈΠ΄ΡΠΎΠ΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΎΠ², ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡΠΈΡ
Π² ΠΏΡΠΎΡΠ΅ΡΡΠ΅ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΈΡ Π³Π°Π·ΠΎΠ³ΠΈΠ΄ΡΠΎΠ΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ ΡΠΊΠ²Π°ΠΆΠΈΠ½
(ΠΠΠΠΠ‘) Π² ΠΏΡΠΎΠΌΡΡΠ»ΠΎΠ²ΡΡ
ΡΡΠ»ΠΎΠ²ΠΈΡΡ
ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΡΡ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΡ Π³Π°Π·ΠΎΠ²ΡΡ
ΠΏΠ»Π°ΡΡΠΎΠ² ΠΈ Π²ΡΠ΅ΠΌΡ Π·Π°Π²Π΅ΡΡΠ΅Π½ΠΈΡ ΠΈΡΠΏΡΡΠ°Π½ΠΈΠΉ ΡΠΊΠ²Π°ΠΆΠΈΠ½.This scientific and qualification work is devoted to the urgent task of developing and researching new models and algorithms for the adaptive identification of gas-hydrodynamic parameters that allow
the process of conducting gas hydrodynamic studies of wells (GGDIS) in field conditions to determine the parameters of gas reservoirs and the time for completion of well tests
- β¦