Investigation into paradigm junction capacitance and inductance of dumbbell-shaped slotted ground structures

Five novel slotted ground microstrip structures have been studied to prove that the gap and the cross junction capacitances and the associated inductance have significant influence on the attenuation poles and passband characteristics. A quasi-static analytical approach based on the concentration of the surface current on the slotted ground plane structure is adopted. Theory is validated against simulation results by commercial Electromagnetic (EM) solver CST Microwave Design Studio™ and measurement by an Agilent performance network analyzer (PNA) E8361A. Robust agreements between theoretical, simulation, and calculated results support the hypothesis. It has been proved that though both the gap and junction capacitances play significant role in determining the attenuation pole, the gap capacitance favorably reduce the location of the attenuation pole with moderately high selectivity of the stopband. © 2008 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2008.

[1]  Nemai Chandra Karmakar,et al.  Dumbbell‐shaped defected ground structure , 2007 .

[2]  Young-Taek Lee,et al.  A novel phase noise reduction technique in oscillators using defected ground structure , 2002, IEEE Microwave and Wireless Components Letters.

[3]  Randy Rhea,et al.  Recent trends in oscillator design , 2004 .

[4]  P. Silvester,et al.  Equivalent Capacitances of Microstrip Open Circuits , 1972 .

[5]  Nemai Chandra Karmakar,et al.  Fractal PBG assisted co‐planar waveguides , 2005 .

[6]  I. Balbin,et al.  Quasi-static modeling of defected ground structure , 2006, IEEE Transactions on Microwave Theory and Techniques.

[7]  Sangwook Nam,et al.  A 4.1 unequal Wilkinson power divider , 2001 .

[8]  Y. Qian,et al.  A design of the low-pass filter using the novel microstrip defected ground structure , 2001 .

[9]  Anand Gopinath,et al.  Calculation of Microstrip Discontinuity Inductances , 1975 .

[10]  Nemai Chandra Karmakar,et al.  Development of phased array antenna by controlling the filling factor of periodic structure , 2007 .

[11]  Y. Kim,et al.  Size reduction and harmonic suppression of rat-race hybrid coupler using defected ground structure , 2004, IEEE Microwave and Wireless Components Letters.

[12]  Jae-Bong Lim,et al.  A novel 1-D periodic defected ground structure for planar circuits , 2000 .

[13]  Jong-Sik Lim,et al.  A power amplifier with efficiency improved using defected ground structure , 2001 .

[14]  Nemai Chandra Karmakar,et al.  Planar electromagnetic bandgap structures , 2006 .

[15]  Nemai Chandra Karmakar,et al.  Potential applications of PBG engineered structures in microwave engineering: Part I , 2004 .

[16]  Dal Ahn,et al.  A design of the novel coupled-line bandpass filter using defected ground structure with wide stopband performance , 2002 .

[17]  Charles E. Smith,et al.  Microstrip Transmission Line with Finite-Width Dielectric and Ground Plane (Short Paper) , 1985 .

[18]  Nemai Chandra Karmakar,et al.  Investigation of novel tapered hybrid defected ground structure (DGS) , 2005 .

[19]  Peter P. Silvester,et al.  Calculation of Inductance of Finite-Length Strips and Its Variation with Frequency , 1973 .