Novel Filtering Power Divider Using Multiple Internal Resistors

Abstract

Abstract-In this paper, we present a novel 3rd filtering power divider with high in-band isolation. The proposed device employs six quarter-wavelength resonators and six internal isolation resistors symmetrically arranged to require the power division and filtering function. Based on the circuit topology, the multiple resistors can be integrated to obtain a good isolation and port impedance matching. Compared to the conventional power divider with bandpass response, the new device is easy to realize a high-order design with a good isolation. For demonstration, a prototype operating at 1.5 GHz with more than 20 dB in-band isolation is implemented. Simulated and experimental results agree well, validating the proposed methodologies.

Filtering Power Divider Based on Lumped Elements

“…Step 1: According to the given operating frequency f 0 and lower transmission zero f Z1 , the parameter C 2 and L 2 can be determined by (14) and (15).…”

“…In [11], interdigital coupling sections are utilized to substitute quarter-wavelength transmission lines to achieve filtering power divider response. Besides interdigital coupling sections, bandpass filters are also used to replace the quarter-wavelength transmission lines in Wilkinson power dividers, resulting in single passband responses [12][13][14]. Unfortunately, they occupy large size.…”

“…Thus, it is necessary to integrate the two functions into one device for miniaturization. In the past, some integrated designs were proposed [9][10][11][12][13][14][15][16][17][18][19][20]. In [9], the filtering structure is cascaded with the T-junction, resulting in dual functions of power dividing and filtering.…”