Dual-Band Compact Wilkinson Power Divider Using Common Inductor and Complex Load

Abstract

A 1.8/2.4-GHz dual-band compact Wilkinson power divider was designed and implemented using an integrated passive device process. The design used a common inductor to match impedance in the even mode. The common inductor replaced two shunt inductors in the circuit so the circuit size was reduced. An additional complex load was then used for matching impedance in the odd mode. The circuit measurements showed reflection at all ports better than-11.9 dB, isolation at the output ports better than-14 dB and transmission coefficient better than-4.3 dB, at both operating frequencies. The circuit occupied only 0.036λ o ×0.018λ o at the higher operating frequency. INDEX TERMS Common inductor, dual band, integrated passive device, lumped transmission line, Wilkinson power divider.

Development and Thorough Investigation of Dual-Band Wilkinson Power Divider for Arbitrary Impedance Environment

“…Importantly, these reports are limited to equal impedances at all the ports. There is one recent report on dual-band PD which utilizes the complex load for the matching purposes [25]. However, the ports are terminated to only equal and real impedances.…”

Theory and Design of a Flexible Two-Stage Wideband Wilkinson Power Divider

“…Nonetheless, there have been extensive advancements in the WPD design techniques to meet the requirements of multi-standard communication systems. A majority of the research focus in the last decade has largely been on multi-band [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] and broadband WPDs .…”

“…A survey of the literature related to recent reports on WPD design reveals that the emphasis has been on enhancing the number of bands and isolation bandwidth [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. There are number of techniques to increase the number of bands in the operating frequency range.…”

“…There are number of techniques to increase the number of bands in the operating frequency range. Originally, the dual-band WPDs [6][7][8][9][10][11][12][13][14][15][16][17][18] evolved, later followed by tri-/quad-band WPDs [19][20][21][22]. However, the increase in the number of bands lead to increased circuit size along with circuit complexity.…”

“…However, the increase in the number of bands lead to increased circuit size along with circuit complexity. The dual-band WPDs in the literature include WPD without reactive elements namely by attaching two central transmission line stubs in the conventional structure [6], unequal WPD operating at arbitrary dual-frequencies [7], WPD with composite left-/right-handed transmission lines [8], WPD with high power division operating at two bands by cascading dual-band T-section structures [9], with reactive elements including two-transmission lines and reactive lumped elements [10], WPD without stubs and additional lumped elements [11], WPD with common inductor with complex load [12], coupled-line based WPD and including four lumped elements [13], multi-band WPD utilizing multi-section LC-ladder circuits [14], with extended frequency ratios including two-section two resistor WPD with design able frequency ratio from 1 to ∞ [15], coupled lines and open stubs based to provide compensation [16], an enhanced frequency ratio coupled-line dual-band WPD with different ratios [17], theory of different frequency ratio is presented by selecting different physical lengths ratio [18] and many more. Few tri-band WPDs includes, WPD operating at three bands with open-short circuit stubs at the input and output port [19], WPD operating at three frequencies utilizing λ/4 open stubs with less frequency bandwidth in the operating bands [20], tri-band WPD utilizing coupled-lines [21], and quad-band WPD using generalized negative-refractive-index transmission-line unit cells [22] etc.…”