FREQUENCY-TUNABLE DUAL-BAND PRINTED ANTENNA EQUIPPED WITH COAXIALSPLIT BALANCING UNIT

2019 ◽  
pp. 60-64
Author(s):  
S. A. Alekseytsev ◽  
A. P. Gorbachev
Keyword(s):  
High Frequency ◽  
Low Frequency ◽  
Dipole Antenna ◽  
Dual Band ◽  
Radiation Characteristics ◽  
High Frequency Response ◽  
Maximum Value ◽  
Linear Behavior ◽  
Lumped Elements ◽  
Frequency Tunable

In this paper, we present initial design of dual-band dipole antenna which able to perform when shifting high frequency band by inserting of inductive element between high-, and low-frequency dipole arms. Responses of high frequency and bandwidth at –10 dB level on the inductivity are presented in the paper. The maximum value of inductivity to be inserted is about hundreds of nH, hence, it can be implemented by microstrip lines. It is also possible to use lumped elements. Approximations of such responses with polynomials power two and lower are presented in the paper. It is shown, that the bandwidth of the S11 below –10 dB high frequency response has approximately linear behavior, so that can be used when carrying out experimental verifying of the numerical simulations. When simulating radiation characteristics the Russian standard FAF‑4D substrate was used, which can operate at frequencies up to 8–10 GHz.

Dual-band low-profile planar antenna for mobile communication application

2015 ◽  
Vol 9 (2) ◽  
pp. 447-452 ◽  
Author(s):  
Xi-Wang Dai ◽  
Tao Zhou ◽  
Bo-Ran Guan
Keyword(s):  
Frequency Band ◽  
Mobile Communication ◽  
High Frequency ◽  
Microstrip Line ◽  
Low Frequency ◽  
Dual Band ◽  
Planar Antenna ◽  
Frequency Resonance ◽  
Low Profile ◽  
High Frequency Resonance

A novel dual-band planar antenna with a low profile for mobile communication system is proposed in this paper. The antenna is composed of one shorted patch with two radiating notches for low frequency resonance and one square patch for high frequency resonance. The low profile is achieved via the shorting patch, which introduces the parallel electrical field between the reflector and antenna. A step-impedance microstrip line is used to feed the antenna. The coupling between the square patch and microstrip line cancels out the inductance of shorting probe, which increases the working bandwidth of proposed antenna. A prototype with a low profile of 0.0286λ is fabricated and measured. The antenna achieves dual impedance bandwidths of 1.6% for the low frequency band and 60% for the high frequency band, covering the frequency range 851–865 MHz and 1.97–3.65 GHz, respectively. The measured results show good agreements with the simulated ones.

scholarly journals Dual-band Dipole Antenna for 2.45 GHz and 5.8 GHz RFID Tag Application

2015 ◽  
Vol 4 (1) ◽  
pp. 31 ◽  
Author(s):  
Y. Yu ◽  
J. Ni ◽  
Z. Xu
Keyword(s):  
Radio Frequency ◽  
Radio Frequency Identification ◽  
Input Impedance ◽  
Return Loss ◽  
Dipole Antenna ◽  
Dual Band ◽  
Radiation Characteristics ◽  
Rfid Tag ◽  
Microstrip Patch ◽  
Frequency Identification

In this paper, a dual-band dipole antenna for passive radio frequency identification (RFID) tag application at 2.45 GHz and 5.8 GHz is designed and optimized using HFSS 13. The proposed antenna is composed of a bent microstrip patch and a coupled rectangular microstrip patch. The optimal results of this antenna are obtained by sweeping antenna parameters. Its return losses reach to -18.7732 dB and -18.2514 dB at 2.45 GHz and 5.8 GHz, respectively. The bandwidths (Return loss <=-10 dB) are 2.42~2.50 GHz and 5.77~5.82 GHz. And the relative bandwidths are 3.3% and 0.9%. It shows good impedance, gain, and radiation characteristics for both bands of interest. Besides, the input impedance of the proposed antenna may be tuned flexibly to conjugate-match to that of the IC chip.

Nonlinear behaviour of the Mack mode in a hypersonic boundary layer

2019 ◽  
Vol 872 ◽  
pp. 74-99 ◽  
Author(s):  
Stuart A. Craig ◽  
Raymond A. Humble ◽  
Jerrod W. Hofferth ◽  
William S. Saric
Keyword(s):  
Boundary Layer ◽  
High Frequency ◽  
Low Frequency ◽  
Nonlinear Behaviour ◽  
Hypersonic Boundary Layer ◽  
Bispectral Analysis ◽  
Frequency Wave ◽  
Number Range ◽  
High Frequency Response ◽  
Quadratic Phase

Mack-mode waves are measured in a hypersonic boundary layer using high-frequency focusing schlieren deflectometry. Experiments are performed using a $5^{\circ }$ flared cone at $0^{\circ }$ angle of attack in the low-disturbance Mach 6 Quiet Tunnel at Texas A&M University across a free-stream unit Reynolds number range of $7.8\times 10^{6}~\text{m}^{-1}\leqslant \mathit{Re}^{\prime }\leqslant 11.0\times 10^{6}~\text{m}^{-1}$. The high-frequency response of the measurement system allows harmonics and other nonlinear behaviour to be measured. Mack-mode waves and several harmonics are clearly observed at a frequency of $f_{0}\approx 250~\text{kHz}$. Bispectral analysis is used to show that these waves undergo several quadratic phase-coupled sum and difference interactions with themselves to produce harmonics, as well interact with a relatively low-frequency wave that results in amplitude modulation. Bispectral analysis is used to highlight these interactions.

scholarly journals A Fully-Printed CRLH Dual-Band Dipole Antenna Fed by a Compact CRLH Dual-Band Balun

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4991
Author(s):  
Muhammad Kamran Khattak ◽  
Changhyeong Lee ◽  
Heejun Park ◽  
Sungtek Kahng
Keyword(s):  
Transmission Line ◽  
Mobile Applications ◽  
Phase Shifter ◽  
Design Method ◽  
Dipole Antenna ◽  
Dual Band ◽  
Dispersion Diagram ◽  
Left Handed ◽  
Lumped Elements ◽  
Hybrid Coupler

In this paper, a new design method is proposed for a planar and compact dual-band dipole antenna. The dipole antenna has arms as a hybrid CRLH (Composite right- and left-handed) transmission-line comprising distributed and lumped elements for the dual-band function. The two arms are fed by the outputs of a compact and printed CRLH dual-band balun which consists of a CRLH hybrid coupler and an additional CRLH phase-shifter. Its operational frequencies are 2.4 and 5.2 GHz as popular mobile applications. Verifying the method, the circuit approach, EM (Electromagnetics) simulation and measurement are conducted and their results turn out to agree well with each other. Additionally, the CRLH property is shown with the dispersion diagram and the effective size-reduction is mentioned.

A hybrid method for broadband vibroacoustic simulations

2021 ◽  
Vol 263 (4) ◽  
pp. 2812-2821
Author(s):  
Jared Miller ◽  
Scott D. Sommerfeldt ◽  
Jonathan D. Blotter ◽  
David C. Copley
Keyword(s):  
Hybrid Method ◽  
High Frequency ◽  
Low Frequency ◽  
Energy Response ◽  
High Frequency Response ◽  
Modal Response ◽  
Listening Tests ◽  
Limited Frequency ◽  
Acoustic Responses ◽  
Vibrating Systems

Many methods for simulating acoustic responses of vibrating systems are only suitable for limited frequency ranges, providing either an accurate low frequency or high frequency response. A hybrid method is presented to combine a low frequency modal response and a high frequency statistical energy response to obtain a unified broadband response. The method is designed to produce an auralizable response. An experimental setup is used to validate the method. Listening tests are conducted to assess the realism of the auralizations compared to measurements. The listening tests confirm that the method is able to produce realistic auralizations, subject to a few limitations.

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