Electrodynamics of dual-band end-fed wire dipole radiators

Journal of «Almaz – Antey» Air and Defence Corporation ◽

10.38013/2542-0542-2021-3-31-39 ◽

2021 ◽

pp. 31-39

Author(s):

S. A. Alekseytsev ◽

Yu. N. Parshin

Keyword(s):

Surface Current ◽

Amplitude Distribution ◽

Current Amplitude ◽

Dual Band ◽

Paper Briefly ◽

Direct Excitation ◽

Yagi Antenna

This paper briefly describes an analysis of main electrodynamic characteristics required in design of dual-band Yagi antenna exciters consisting of two electrically thick conductors. The study of end-fed excitation of the said system of conductors allows to predetermine the design of conceptually new circuits of classic dipole radiators, avoiding closely-spaced arrangement of feeding strips that ensure direct excitation of dipole arms and, therefore, reducing their electromagnetic spurious coupling. The latter prevents asymmetry in surface current amplitude distribution on dipole arms and allows to improve its directivity and matching with a power feeder.

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MODIFIED HANSEN–WOODYARD CONDITION

Canadian Journal of Physics ◽

10.1139/p64-221 ◽

1964 ◽

Vol 42 (12) ◽

pp. 2429-2442

Author(s):

Kiyoshi Nagai

Keyword(s):

Phase Velocity ◽

Amplitude Distribution ◽

Current Amplitude ◽

Experimental Results ◽

Constant Current ◽

Maximum Gain ◽

Theoretical Maximum ◽

Yagi Antenna

Modified Hansen–Woodyard conditions for a continuous end-fire array of small dipoles are derived for two cases: (a) constant current amplitude distribution along the array; (b) a superposition of constant and attenuating current amplitudes along the array. The optimum phase velocity along the array for maximum gain in the end-fire direction is determined for these cases. In case (a) the directivity may be used to determine a theoretical maximum gain for a long end-fire array such as a long Yagi antenna, while the directivity in case (b) may be used to explain the experimental results obtained by Ehrenspeck and Poehler.

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Single-peak-regulation and wide-angle dual-band metamaterial absorber based on hollow-cross and solid-cross resonators

The European Physical Journal Applied Physics ◽

10.1051/epjap/2020200145 ◽

2020 ◽

Vol 91 (3) ◽

pp. 30901

Author(s):

Yibo Tang ◽

Longhui He ◽

Jianming Xu ◽

Hailang He ◽

Yuhan Li ◽

...

Keyword(s):

Transverse Electric ◽

Surface Current ◽

Dielectric Substrate ◽

Transverse Magnetic ◽

Metamaterial Absorber ◽

Absorption Peak ◽

Dual Band ◽

Single Peak ◽

Wide Angle ◽

Surface Current Density

A dual-band microwave metamaterial absorber with single-peak regulation and wide-angle absorption has been proposed and illustrated. The designed metamaterial absorber is consisted of hollow-cross resonators, solid-cross resonators, dielectric substrate and metallic background plane. Strong absorption peak coefficients of 99.92% and 99.55% are achieved at 8.42 and 11.31 GHz, respectively, which is basically consistent with the experimental results. Surface current density and changing material properties are employed to illustrate the absorptive mechanism. More importantly, the proposed dual-band metamaterial absorber has the adjustable property of single absorption peak and could operate well at wide incidence angles for both transverse electric (TE) and transverse magnetic (TM) waves. Research results could provide and enrich instructive guidances for realizing a single-peak-regulation and wide-angle dual-band metamaterial absorber.

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Dual Band Notch, Compact, Low profile, Hybrid Ultra Wideband RDRA

International Journal of Engineering and Advanced Technology - Regular Issue ◽

10.35940/ijeat.a1765.1010120 ◽

2020 ◽

Vol 10 (1) ◽

pp. 166-169

Keyword(s):

Radiation Pattern ◽

Dielectric Resonator ◽

Surface Current ◽

Wide Band ◽

Ultra Wideband ◽

Dual Band ◽

Ultra Wide Band ◽

Impedance Bandwidth ◽

Dielectric Resonator Antenna ◽

Ground Structure

This paper presents a novel, compact Ultra Wide Band , Asymmetric Ring Rectangular Dielectric Resonator Antenna (ARRDRA), which is a unique combination of Thin Dielectric Resonator (DR), Fork shape patch and defective ground structure. The base of the proposed antenna is its Hybrid structure, which generates fundamental TM, TE and higher order modes that yields an impedance bandwidth of 119%. Proposed antenna provides a frequency range from 4.2 to 16.6 GHz with a stable radiation pattern and low cross polarization levels. Peak gain of 5.5 dB and average efficiency of 90% is obtained by the design. Antenna is elongated on a FR4 substrate of dimension 20 x 24x 2.168 mm3 and is particularly suitable for C band INSAT, Radio Altimeter, WLAN, Wi-Fi for high frequencies. Ease in fabrication due to simplicity, compactness, stable radiation pattern throughout the entire bandwidth are the key features of the presented design. Inclusion of Defective ground structure and asymmetric ring not only increases the bandwidth but also stabilize the gain and efficiency due to less surface current. Presented design launch an Ultra Wide Band antenna with sufficient band rejection at 4.48-5.34 and 5.64-8.33 GHz with stable radiation pattern and high gain.

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Design of a Dual-Band, Compact Yagi Antenna Over an EBG Ground Plane

IEEE Antennas and Wireless Propagation Letters ◽

10.1109/lawp.2008.2011502 ◽

2009 ◽

Vol 8 ◽

pp. 88-91 ◽

Cited By ~ 8

Author(s):

Sungkyun Lim ◽

M.F. Iskander

Keyword(s):

Ground Plane ◽

Dual Band ◽

Yagi Antenna

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A Miniaturized Dual-Band FSS with Closely Spaced Resonances Using 2.5-Dimension Structure

Frequenz ◽

10.1515/freq-2017-0267 ◽

2018 ◽

Vol 72 (11-12) ◽

pp. 511-515 ◽

Cited By ~ 1

Author(s):

Weiyang Yin ◽

Hou Zhang ◽

Tao Zhong ◽

Xueliang Min

Keyword(s):

Resonant Frequency ◽

Free Space ◽

Frequency Ratio ◽

Surface Current ◽

Dual Band ◽

Operating Mechanism ◽

Special Design ◽

Measurement Results ◽

Simulation Results ◽

The Operating Mechanism

Abstract Using 2.5-dimension structure, a novel miniaturized dual-band FSS with closely spaced resonances is proposed in the paper. The special design of the geometry contributes to two closely spaced resonances at 1.69 GHz and 2.16 GHz respectively and the frequency ratio of upper to the lower resonant frequency is 1.27. Besides, the two bands can be controlled individually by varying corresponding parameters. The size of the proposed FSS is only 0.057λ0, where the λ0 represents free space wavelength at lower resonant band. Furthermore, the simulation results show the proposed FSS exhibits stable response with different incident angles and polarizations. To understand the design better, the distribution of surface current is analyzed to explain the operating mechanism of the proposed FSS. Finally, the proposed FSS is fabricated and the measurement results are in accordance with the simulation results.

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A Hybrid of T-Dipole and Quasi-Yagi Antenna for Dual-band WLAN Access Point

REV Journal on Electronics and Communications ◽

10.21553/rev-jec.37 ◽

2012 ◽

Vol 2 (1-2) ◽

Cited By ~ 1

Author(s):

Son Xuat Ta ◽

Ikmo Park ◽

Chien Dao-Ngoc

Keyword(s):

Microstrip Line ◽

Wireless Local Area Network ◽

Local Area Network ◽

Access Point ◽

Local Area ◽

Antenna Design ◽

Dual Band ◽

Area Network ◽

Yagi Antenna ◽

Peak Gain

In this paper, a hybrid of T-dipole and quasi-Yagi antenna is presented for using in dual-band Wireless Local Area Network (WLAN) access point. The antenna is made up of combination of T-dipole and quasi-Yagi antenna structures, which are distinctly designed to operate at 2.4 and 5.5 GHz frequency bands. A simply integrated balun that consists of a curved microstrip line and a circular slot to allow broadband characteristic is used to feed the antenna. The final antenna design presents measured bandwidths (RL ≤ − 10 dB) of 2.35 – 2.55 GHz and 4.30 – 6.56 GHz which cover completely the two bands of WLAN. Simulated and measured results of peak gain and radiation patterns in both E- and H-plane validate potential of the design.

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Dual-band crossed-Yagi antenna for RF-based power transmitters with polarization and harmonic detection functions

2017 IEEE Wireless Power Transfer Conference (WPTC) ◽

10.1109/wpt.2017.7953856 ◽

2017 ◽

Author(s):

Sheng-Fan Yang ◽

An-Ching Huang ◽

Chun-Jung Peng ◽

Tzuen-Hsi Huang ◽

Fang-Ming Wu ◽

...

Keyword(s):

Dual Band ◽

Harmonic Detection ◽

Yagi Antenna

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A Novel Dual-Band Circularly Polarized Rectangular Slot Antenna

International Journal of Antennas and Propagation ◽

10.1155/2016/9071610 ◽

2016 ◽

Vol 2016 ◽

pp. 1-8 ◽

Cited By ~ 4

Author(s):

Biao Li ◽

Yang Ding ◽

Ying-Zeng Yin

Keyword(s):

Return Loss ◽

Coplanar Waveguide ◽

Surface Current ◽

Axial Ratio ◽

Dual Band ◽

Slot Antenna ◽

Surface Current Density ◽

Circularly Polarized ◽

Rectangular Slot ◽

Metal Frame

A coplanar waveguide fed dual-band circularly polarized rectangular slot antenna is presented. The proposed antenna consists of a rectangular metal frame acting as a ground and an S-shaped monopole as a radiator. The spatial distribution of the surface current density is employed to demonstrate that the circular polarization is generated by the S-shaped monopole which controls the path of the surface currents. An antenna prototype, having overall dimension 37 × 37 × 1 mm3, has been fabricated on FR4 substrate with dielectric constant 4.4. The proposed antenna achieves 10 dB return loss bandwidths and 3 dB axial ratio (AR) in the frequency bands 2.39–2.81 GHz and 5.42–5.92 GHz, respectively. Both these characteristics are suitable for WLAN and WiMAX applications.

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