A Dual-Band Coupled-Line Coupler With an Arbitrary Coupling Coefficient

2012 ◽  
Vol 60 (4) ◽  
pp. 945-951 ◽  
Author(s):  
Xi Wang ◽  
Wen-Yan Yin ◽  
Ke-Li Wu
Keyword(s):  
Coupling Coefficient ◽  
Dual Band ◽  
Coupled Line ◽  
Arbitrary Coupling

scholarly journals GENERALIZED IMPEDANCE-TRANSFORMING DUAL-BAND BRANCH-LINE COUPLERS FOR ARBITRARY COUPLING LEVELS

2013 ◽  
Vol 53 ◽  
pp. 399-415 ◽  
Author(s):  
Qiang Liu ◽  
Yuanan Liu ◽  
Yongle Wu ◽  
Jun-Yu Shen ◽  
Shulan Li ◽  
...  
Keyword(s):  
Dual Band ◽  
Branch Line ◽  
Arbitrary Coupling

Novel rat-race coupler design of arbitrary coupling coefficient using substrate integrated waveguide cavity

2018 ◽  
Vol 10 (8) ◽  
pp. 861-869 ◽  
Author(s):  
Min-Hua Ho ◽  
Yi-Hao Hong ◽  
Jen-Chih Li
Keyword(s):  
Transmission Lines ◽  
Coupling Coefficient ◽  
Substrate Integrated Waveguide ◽  
Cavity Field ◽  
Arbitrary Coupling ◽  
Degenerate Mode ◽  
Quarter Wavelength ◽  
Small Phase ◽  
Hybrid Coupler ◽  
Degenerate Modes

AbstractThe contribution of this paper is to propose a novel rat-race hybrid coupler of arbitrary coupling coefficient. Traditionally, the rat-race hybrid couplers are built by various loop-alike transmission-lines of multiple quarter-wavelength, and in this paper, we approach the coupler design by using a circular substrate integrated waveguide (SIW) cavity (SIWC). The employed SIWC supports two mutually orthogonal degenerate modes, and cavity field is formed by the two modes in an arbitrary weighting ratio which defines the proposed rat-race coupler's coupling coefficient. The cavity is excited by a microstrip combined coupling slot with the microstrip along a specifically chosen direction. The energy of each degenerate mode can be solely extracted by an associated subminiature version A (SMA) whose position is carefully determined. The isolation between the coupling slots is assured by their perpendicular layout, and the isolation between the SMA probes is obtained by the orthogonality of the two degenerate modes. Experiments are conducted on the 3- and 10-dB coupling coefficient samples to verify this novel rat-race coupler design. The measurements agree well with the simulations, and circuit's good performance is observed in terms of coupling precision, isolations, and small phase imbalances.

A Dual-Band Coupled-Line Balun Filter

2007 ◽  
Vol 55 (11) ◽  
pp. 2406-2411 ◽  
Author(s):  
Lap Kun Yeung ◽  
Ke-Li Wu
Keyword(s):  
Dual Band ◽  
Coupled Line

Design of dual-band coupled-line balun

2011 ◽  
Author(s):  
Hualiang Zhang ◽  
Jin Shao ◽  
Song Tan ◽  
Kevin J. Chen
Keyword(s):  
Dual Band ◽  
Coupled Line

scholarly journals Beamwidth-Enhanced Low-Profile Dual-Band Circular Polarized Patch Antenna for CNSS Applications

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Hongmei Liu ◽  
Chenhui Xun ◽  
Shaojun Fang ◽  
Zhongbao Wang
Keyword(s):  
Patch Antenna ◽  
Ground Plane ◽  
Axial Ratio ◽  
Dual Band ◽  
Impedance Bandwidth ◽  
Coupled Line ◽  
Low Profile ◽  
Feed Network ◽  
Single Input ◽  
Half Power

A low-profile dual-band circular polarized (CP) patch antenna with wide half-power beamwidths (HPBWs) is presented for CNSS applications. Simple stacked circular patches are used to achieve dual-band radiation. To enhance the HPBW for the two operation bands, a dual annular parasitic metal strip (D-APMS) combined with reduced ground plane (R-GP) is presented. A single-input feed network based on the coupled line transdirectional (CL-TRD) coupler is also proposed to provide two orthogonal modes at the two frequency bands simultaneously. Experimental results show that the 10 dB impedance bandwidth is 32.7%. The 3 dB axial ratio (AR) bandwidths for the lower and upper bands are 4.1% and 6.5%, respectively. At 1.207 GHz, the antenna has the HPBW of 123° and 103° in the xoz and yoz planes, separately. And the values are 127° and 113° at 1.561 GHz.

A COMPACT DUAL-BAND COUPLED-LINE BALUN WITH TAPPED OPEN-ENDED STUBS

2011 ◽  
Vol 22 ◽  
pp. 109-122 ◽  
Author(s):  
Jin Shao ◽  
Hualiang (Bruce) Zhang ◽  
Chang Chen ◽  
Song Tan ◽  
Kevin J. Chen
Keyword(s):  
Dual Band ◽  
Coupled Line
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