Turkish Journal of Electrical Engineering and Computer Sciences
DOI
10.3906/elk-1701-93
Abstract
This paper introduces a new scheme for effective output port isolation and return loss in RF-filtering divider design. The proposed design incorporates an extended transmission line and a conventional resistor as isolation elements. The technique has a simpler microstrip circuit implementation when it comes to the integration of a single-band band-pass filter with a Wilkinson power divider to achieve simultaneous filtering-dividing action. It is established that if a band-pass filter with a certain fractional-bandwidth is matched to 70.7 $\Omega $, a transmission line section and isolation resistor are sufficient for achieving reasonable output port return loss and isolation in the resulting filtering divider. In experimental validation, two single-band band-pass filters, namely a coupled-line filter and an open-loop coupled resonator triangular filter with center frequencies of 3 GHz and 1 GHz, respectively, effectively replace the conventional quarter-wavelength transformers for equal division of power. The proposed filtering divider structures were fabricated and a reasonable agreement was observed between respective simulated and measured S-parameter responses. The experimental results for a coupled-line filtering power divider and an open-loop triangular filtering power divider were as follows: 1 dB fractional-bandwidths of 15.3% and 12%, port isolations better than 31 dB and 20 dB, and good out-of-band performances up to 2.67f$_{0}$ and 2.85f$_{0}$, respectively.
Keywords
Coupled line filter, open loop coupled triangular filter, band-pass filter, filtering divider, equal split
First Page
4854
Last Page
4866
Recommended Citation
KHAN, ZAFAR BEDAR and ZHAO, HUILING
(2017)
"On the design of equal division single-band filtering dividers with an extended transmission line and resistor as isolation elements,"
Turkish Journal of Electrical Engineering and Computer Sciences: Vol. 25:
No.
6, Article 34.
https://doi.org/10.3906/elk-1701-93
Available at:
https://journals.tubitak.gov.tr/elektrik/vol25/iss6/34
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