Broadband Phase Shifter Using Loaded Transmission Line
ABSTRACT This letter presents a novel loaded transmission line, which has a constant phase shift over a wide bandwidth, referenced to a uniform transmission line. Compared with the conventional coupled line phase shifter, the configuration shows good performance with simplicity in both design and fabrication. The optimal design parameters for different phase shift values up to 120° are also presented to allow for a quick design process. To verify the configuration, a 90° phase shifter using a T shaped open stub loaded transmission line is designed, fabricated and measured. Excellent performance is achieved with small insertion loss and phase deviation over a bandwidth of 82%.
- [Show abstract] [Hide abstract]
ABSTRACT: Surface mount unit cells for phase leading bandpass networks are developed for easy integration with microstrip lines on PCB for the phase shifter implementation. With the suitable design of layout and fabricated in low temperature cofired ceramic (LTCC), the bandpass network and its parasitic components are controlled to ensure the broadband operation. These unit cells of phase leading bandpass networks are mounted with phase lag microstrip lines on PCB for the design of broadband phase shifters. Unit cells can be cascaded in a single branch of power divider to create large phase shift or placed at different branch to give small phase shift while keeping sufficient return loss bandwidth. Four phase shfiters with phase shift of 22.5°, 45°, 90° and 135° are fabricated and measured using three different unit cells. Measured results of all four phase shifters show about 100% phase shift bandwidth, better than 10 dB return loss and less than 1.4 dB imbalance from 2.6 to 7.7 GHz.Microwave Conference (EuMC), 2012 42nd European; 01/2012
- [Show abstract] [Hide abstract]
ABSTRACT: For the first time, a differential phase shifter with harmonic suppression is proposed. Not only does the proposed structure provide a constant differential phase shift over a wide bandwidth, but it also has good harmonic rejection. Compared to the existing coupled-line phase shifters, the proposed stub-loaded transmission line configurations show good performance, with simplicity in both design and fabrication. Design formulas for the structure are derived using an analytical technique. Optimal design parameters for typical differential phase shifts which are independent of substrate used and operating frequency are provided to allow for a quick design procedure. To illustrate the principles, a broadband 45 ° phase shifter with harmonic suppression is designed, fabricated, and measured. It achieved excellent performance with small insertion loss, small phase deviation within the desired bandwidth, and good out-of-band rejection.IEEE Transactions on Industrial Electronics 01/2014; 61(6):2891-2899. · 6.50 Impact Factor
Conference Paper: Hybrid type of broad-band microwave phase shifter using schiffman lines[Show abstract] [Hide abstract]
ABSTRACT: This paper presents a new hybrid type of phase shifter that employs basic Schiffman lines. Compared with conventional coupled line and Schiffman line phase shifters the new hybrid design shows advantage of optimally very small phase shift error of (±5°) over an entire band of 2.85-17.15 GHz (143% bandwidth). To validate the method, a 90° phase shifter is designed and simulated.Applied Sciences and Technology (IBCAST), 2013 10th International Bhurban Conference on; 01/2013