An Improved Broadband Siw Phase Shifter With Embedded Air Strips

Abstract

Abstract-In this paper, an improved broadband substrate integrated waveguide (SIW) phase shifter with embedded air strips is presented. Phase shifter can be generated based on the variable widths of SIW, variable lengths of microstrip line and a row of embedded air strips. The simulated and measured results both show that this kind of SIW phase shifter has excellent performance for a wider bandwidth. Measured results indicate that the proposed SIW phase shifters for the 45 • and 90 • versions have achieved the fractional bandwidths of 59.6% from 10.2 to 18.85 GHz with the accuracy of 2.5 • , and of 62.3% from 9.5 to 18.1 GHz with the accuracy of 5 • , respectively. The return losses are better than 15.8 dB and 14.5 dB for 45 • and 90 • modules, respectively. In addition, the insertion losses are both found to be better than 1.6 dB in the considered band.

A Compact Phase Shifter With Wide Phase Range Using Loaded Transmission Line

“…We can see that a broadband phase shifter is obtained. Compared with phase shifters designed in [1,5,13], the bandwidth of the proposed structure is greatly broadened. Compared with [3,9], the proposed structure has low profile.…”

“…In order to ensure the accurate phase shift at the center frequency Δφ and good match, S 11 = 0 and S 21 = 1 are chosen. We plug Equation (3) into Equations (4), (5), and (6), respectively. θ m0 = π can be calculated.…”

“…It plays an important role in microwave beam formers found in phase-array antenna systems, phase modulation communication systems, and emerging intelligent antenna systems for broadband wireless mobile communications [1,2]. With the increasing application of phase shifters, various structures have been designed [3][4][5][6]. In order to achieve a broad bandwidth, an extremely tight coupling is required, thus resulting in narrow microstrip lines and very narrow coupling gaps.…”

Millimetre‐wave beam‐steering array antenna by emphasising on improvement of Butler matrix features

“…It's clear that the dispersion of phase coefficient will be repressed considerably.. A similar procedure can be utilised to analyse a Δ f < 0 state (the backward type) [15][16]. Fig.…”

“…Due to high atmospheric debilitation in mm-wave band antennas, there is a serious issue that communication range is reduced. To conquer the problem, use of beam-steering technique is offered [13][14][15][16][17][18]. However, the mentioned designing antennas at mm-wave frequency have some complexity, as it is too difficult to design and fabricate them because of their small size in complex structures.…”