A dual-band crossover using cross-shaped microstrip line for small and large band ratios

Abstract

A novel design of planar dual-band microstrip crossover operating at small and large frequency ratios is presented. These features of the proposed dual-band crossover are achieved by a cross-shaped transmission line. To obtain the dual-band characteristics, the required closed form design formulas are computed using the ABCD matrix method. Based on the design formulas, the realizable small and large band ratios are calculated as 1.65–2.14 and 4.1–8.76, respectively. To validate the computed band ratios, three examples of dual-band crossovers are presented. Finally, two prototypes of dual-band crossover working at smaller and larger frequency ratios are fabricated and tested. The fabricated dual-band crossovers exhibit good return loss and isolation of over 20 dB with minimal insertion loss.

Control of the Magnon-Photon Level Attraction in a Planar Cavity

“…Note added. After the paper was written, we found in the last week a preprint also studying the level attraction effect in planar cavity, but with a different cavity design, see Inspired by the well known performance of interferometric techniques, which can operate over a large frequency range and have excellent signal-to-noise ratio (SNR) in magnetic resonance experiments [47,48], we used microstrip cross junction to fabricate a Michelson-like interferometer. The microstrip cross junction topology is depicted in Fig.…”

Design of Frequency-Reconfigurable Branch-Line Crossover Using Rectangular Dielectric Channels

“…Table 5 shows a comparative study to demonstrate the superiority of the proposed reconfigurable crossover over the previously reported crossovers. Compared to [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] and [38][39], the proposed crossover exhibits minimal insertion loss throughout the tuning range. When compared to [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] and [38][39], the proposed crossover achieves excellent fractional bandwidth, isolation, and return loss.…”

“…These designs exhibited high return loss in the passband in addition to fabrication problems. To address these issues, branch line structures have been proposed to realize planar crossovers with smaller footprint areas, wideband, and multi-band responses [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

“…To support multiple standards in current wireless technology, several configurations have been developed to implement multi-band crossovers [15][16][17][18][19][20][21][22]. In [15], a dualband crossover has been designed by employing right/lefthanded transmission lines.…”

“…In [20], a triple-band planar crossover has been realized based on the multi-band transmission lines. In [21], a cross-shaped line has been employed for the design of a dual-band crossover.…”