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Three-line coupled structure (TLCS) is employed in the design of the filtering power divider (FPD) to achieve a broad fractional bandwidth and good frequency selectivity in this paper. A detailed theoretical analysis of the proposed FPD is presented by using the calculated method of impedance matrix deduction. To validate the design concept, the proposed initial FPD prototype is electromagnetically simulated, whose performance shows good consistency with that of the proposed theoretical calculation. In addition, a simple quasi-lumped impedance transformer is introduced near the input port to further improve the matching status of the FPD. These two above-mentioned FPDs are both designed with center frequencies of 2.42 GHz and 3-dB fractional bandwidths of over 82.6%, the latter one of which is fabricated and tested. Comparisons between the simulated and measured results are presented with good agreement to verify the calculated predictions. [ABSTRACT FROM AUTHOR]

A wideband filtering power divider (FPD) with multiple transmission zeros (TZs) is presented in this article. By introducing four pairs of coupled lines and two half‐wavelength stubs to the power divider, a flat passband with two controllable TZs and four fixed ones is achieved. A resistor is then arranged in the structures to obtain good isolation between output ports. For demonstration, a FPD centred at 2.6 GHz with 3‐dB fractional bandwidth of 22% is designed, fabricated, and measured. The measured minimum in‐band insertion loss is 0.34 dB, and the isolation is over 20 dB within the passband. Good agreement between the simulated and measured results can be observed. [ABSTRACT FROM AUTHOR]

Abstract: A novel controllable wideband filtering power divider (FPD) with sharp roll‐off skirt and good isolation is presented in this article. By introducing a pair of coupled lines and several uniformed quarter‐wavelength microstrip lines to the power divider, a wide flat passband with good selectivity is achieved. A resistor is then arranged between the 2 coupled line structures to obtain good isolation. Even‐mode and odd‐mode approach is applied to deduce the design equations of the proposed FPD. The center frequency can be adjusted flexibly by simply controlling the length of the coupled lines and the other microstrip lines. Eventually, the proposed power divider centered at 2.3 GHz with a fractional bandwidth of 75% is fabricated and measured for verification. The measured minimum in‐band insertion loss is 0.3 dB, while the isolation is better than 20 dB. Good agreement is shown between the simulated and measured results. [ABSTRACT FROM AUTHOR]