Novel dual-band hybrid coupler using improved simplified CRLH transmission line stubs

2010 ◽  
Vol 52 (11) ◽  
pp. 2473-2476 ◽  
Author(s):  
Jian-Qiang Gong ◽  
Chang-Hong Liang ◽  
Bian Wu
Keyword(s):  
Transmission Line ◽  
Dual Band ◽  
Hybrid Coupler

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.

SIMPLIFIED EXTENDED COMPOSITE RIGHT/LEFT-HANDED TRANSMISSION LINE STRUCTURE FOR DUAL-BAND APPLICATIONS

2010 ◽  
Vol 15 ◽  
pp. 137-144 ◽  
Author(s):  
Li Qiang ◽  
Hongmin Lu ◽  
Wei Zhao ◽  
Ji-Kang Wang ◽  
Bing Liu
Keyword(s):  
Transmission Line ◽  
Dual Band ◽  
Line Structure ◽  
Left Handed

High Layer Count in LTCC Dual Band Antenna for Galileo GNSS

2008 ◽  
Vol 5 (4) ◽  
pp. 156-160 ◽  
Author(s):  
Peter Uhlig ◽  
Dirk Manteuffel ◽  
Stefan Malkmus
Keyword(s):  
Electrical Properties ◽  
Low Temperature ◽  
Patch Antenna ◽  
Process Variations ◽  
Dual Band ◽  
Electrical Performance ◽  
Dual Band Antenna ◽  
Number Of Layers ◽  
High Layer ◽  
Hybrid Coupler

The adaptation of the LTCC (Low Temperature Cofired Ceramics) process for an unusually high number of layers (up to 50) will be described and explained in this paper. Special attention will be paid to lamination, debindering, and cofiring of the LTCC stack. The influence of necessary process variations on electrical properties such as permittivity will be studied. Very often the number of layers is determined by the complexity of the circuit. Here a minimum substrate height is required for the electrical performance of a patch antenna, particularly in terms of bandwidth. A dual band antenna for two Galileo bands at 1.58 GHz and 1.18 GHz was realized as a combination of two coupled patches. Circular polarization was attained by separately feeding each patch with a hybrid coupler. These features add further layers to an already considerable substrate height.

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