Design of a composite right/left-handed transmission line unit-cell for a U-shaped mushroom ZOR antenna based on left-handed metamaterials

2012 ◽  
Vol 61 (10) ◽  
pp. 1633-1635 ◽  
Author(s):  
Cherl-Hee Lee ◽  
Jonghun Lee ◽  
Dong-Sik Woo ◽  
Kang-Wook Kim
Keyword(s):  
Transmission Line ◽  
Unit Cell ◽  
Left Handed

Liquid crystal-based tunable CRLH-transmission line for leaky wave antenna applications at Ka-Band

2014 ◽  
Vol 6 (3-4) ◽  
pp. 325-330 ◽  
Author(s):  
María Roig ◽  
Matthias Maasch ◽  
Christian Damm ◽  
Rolf Jakoby
Keyword(s):  
Liquid Crystal ◽  
Transmission Line ◽  
Unit Cell ◽  
Leaky Wave ◽  
Ka Band ◽  
Left Handed ◽  
Leaky Wave Antenna ◽  
Wave Antenna ◽  
Operation Frequency

In this work, a liquid crystal based tunable composite right/left-handed transmission line for future leaky wave antennas working at the Ka-band is presented. The tuning of the liquid crystal is achieved by means of magnetic and electric biasing. For this purpose, different prototypes are fabricated for each biasing technique and their dispersive characteristics compared. Electric tunability is achieved by implementing highly resistive bias lines in the unit cell layout. Both techniques yield similar tuning capabilities at the operation frequency of 27GHz whereas the electric one has the advantage of being easily integratable in the layout.

scholarly journals Design of composite right/left-handed transmission line for phase shifter of multi-band base station antenna

2018 ◽  
Vol 5 ◽  
pp. 12
Author(s):  
Naobumi Michishita ◽  
Yoshihide Yamada ◽  
Keizo Cho
Keyword(s):  
Phase Shift ◽  
Transmission Line ◽  
Phase Shifter ◽  
Vertical Plane ◽  
Equivalent Circuit Model ◽  
Base Station ◽  
Unit Cell ◽  
Operating Frequency ◽  
Left Handed ◽  
Multi Band

In multi-band base station antennas, interference toward neighboring cells at low operating frequency in-creases since tilting angle is frequency-independent and beamwidth in the vertical plane increases as de-creasing the operating frequency. In this paper, the realization of the different phase shifts at each frequency is proposed by using the dispersion relation of the composite right/left-handed transmission line. The feasi-bility of the phase shift is clarified by using equivalent circuit model of the unit cell. Next, the dispersion and Bloch impedance of the actual configuration of the unit cell are designed. The inverse phase shift at each frequency is verified experimentally.

Novel dual band patch antenna With Gap coupled composite right/left-handed transmission line

2018 ◽  
Vol 11 (1) ◽  
pp. 87-93
Author(s):  
Z. Ahmed ◽  
M. M. Ahmed ◽  
M. B. Ihsan ◽  
A. A. Chaudhary ◽  
J. K. Arif
Keyword(s):  
Transmission Line ◽  
Patch Antenna ◽  
Frequency Ratio ◽  
Unit Cell ◽  
Dual Band ◽  
Rectangular Patch ◽  
Left Handed ◽  
At Resonance ◽  
Low Profile ◽  
Resonance Frequencies

AbstractA novel low profile dual band patch antenna is presented. It consists of a composite right/left-handed transmission line (CRLH TL) unit cell gap coupled with the radiating edge of a rectangular patch antenna. The dual band behavior is achieved by coupling the zeroth order resonance mode of CRLH TL and TM10mode of the patch antenna. It is shown that frequency ratio can be changed by varying the gap between the patch and CRLH TL unit cell. The proposed configuration enables frequency reconfigurability by changing the CRLH TL unit cell using a switch. A prototype of the antenna having frequency ratiof2/f1= 1.08 is designed and fabricated. The proposed antenna shows measuredS11≤ −10 dB bandwidth of 100 and 50 MHz at resonance frequencies off1= 4.84 andf2= 5.22 GHz, respectively. A 2 × 2 dual band CRLH TL coupled patch array is also presented, showing more than 12.7 dBi gain at both resonance frequencies.

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