Miniaturized Power Divider With Triple-Band Filtering Response Using Coupled Line

Abstract

This proposed work describes a miniaturized and simple power divider that uses coupled lines for triple-band filtering. The intended setup included an isolation resistor connecting the output feed lines through Structure-3 and coupled line-based microstrip resonators connected to the input feed line. The presented power divider achieves three passbands with a filtering response. The first and second passbands are achieved by the coupled line that includes Resonator-1 and Resonator-2 of the proposed structure. The third passband is realized due to Resonator-3. Furthermore, by varying the structural parameter of the designed triple-band filtering power divider, the resonance frequencies of all three passbands can be controlled because of changes in their equivalent lumped parameters. The resonance frequency mainly depends on its equivalent inductance and capacitance value. For validation of the simulation result, the filtering power divider structure has been fabricated and tested. The experimental results denote that the prototype has a fractional bandwidth (|S21|<-3 dB) of about 20.0 % (1.1 GHz to 1.35 GHz), 37.0 % (2.0 GHz to 2.9 GHz), and 15.0 % (3.25 GHz to 3.8 GHz) respectively for first, second and third pass-bands. This arrangement shows isolation above 18 dB for all three bands with a downsized of 0.1λg × 0.12λg (25 mm × 30 mm) according to the operating frequency of the first frequency passband. The triple band performance of the developed component shows a good input reflection coefficient. The operating frequencies, which are suitable for the application of L-band, WLAN, sub-6 GHz band of 5G, which include 1.23 GHz, 2.41 GHz, and 3.55 GHz

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A Lumped-Element Directional Coupler for Bandwidth Enhancement, Impedance Matching, and Harmonic Suppressions

“…There have been extensive researches on multifunctional multiport components in recent literatures [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. This is because cascading multiple microwave components can lead to increased circuit area, fabrication complexity, and insertion loss in the radio frequency front end.…”

“…This is because cascading multiple microwave components can lead to increased circuit area, fabrication complexity, and insertion loss in the radio frequency front end. These components have been studied for various applications such as dual/multiband performance [8][9][10][11][12][13], wideband filtering performance [14,15], and arbitrary impedance matching [16][17][18]. However, the couplers proposed in [8][9][10][11][12][13][14][15][16], which are based on microstrip-line structures, are limited by their large circuit sizes.…”

“…These components have been studied for various applications such as dual/multiband performance [8][9][10][11][12][13], wideband filtering performance [14,15], and arbitrary impedance matching [16][17][18]. However, the couplers proposed in [8][9][10][11][12][13][14][15][16], which are based on microstrip-line structures, are limited by their large circuit sizes. On the other hand, in [17,18], lumped-element couplers with real/complex impedance matching are only suitable for narrow bands due to their low fractional bandwidths.…”

Improved Empirical Formula Modeling Method Using Neuro-Space Mapping for Coupled Microstrip Lines

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