Abstract
In this paper, a balanced phase shifter using cascaded three microstirp lines and two coupled lines is proposed. The reference line is fixed without center delay line. With such configuration, wideband differential-mode (DM) phase shift can be achieved. The coupled line and half-wavelength microstrip line provide the out-of-band and in-band common-mode (CM) suppression, respectively. Compared with the state-of-the-art balanced phase shifters, the proposed balanced phase shifter has the advantages of wideband CM suppression and compact size with simple structure and fixed reference line. Theoretic analysis, parametric study and design procedure are carried out completely. To verify the theoretic prediction, two prototypes covering the frequency of 1.8 GHz are designed with the relative operating bandwidth for 45° ± 2.1° (90° ± 3.7°) phase shifter of 50% (53%), with the minimum return loss better than 14.7 dB, and the relative CM suppression bandwidth better than 150%.
Highlights
Phase shifter plays an important role in wireless communication system such as phased arrays, beamforming networks, and antenna feed networks
Compared with the balanced phase shifters [22], [23], the proposed design shows the advantages of wideband CM suppression, compact size with simple structure and fixed reference line
The feature of wide bandwidth is achieved with the advantages of wideband CM suppression and compact size with simple structure and fixed reference line
Summary
Phase shifter plays an important role in wireless communication system such as phased arrays, beamforming networks, and antenna feed networks. Some single-ended phase shifters utilizing stub-loaded lines [3]–[5] or multimode resonators [6]–[8] achieve narrow band or wideband phase shift but with large circuit size. In [20], CM and DM operations of the loaded-line balanced phase shifter are both for different phase shifts so that CM suppression cannot be achieved. Y. Nie et al.: Compact Balanced Phase Shifter With Wideband Common-Mode Suppression ports, but this symmetric feature is the reason for the large circuit size. Compact size can be achieved in both system level and single circuit because the reference line is fixed for different phase shifts and the circuit has no requirement of two circuit parts to be symmetric to the center line of the balanced ports. S-parameters and ABCD parameters [25] of Part 1 and the ABCD matrix of Part 1 can be given by
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