A novel analog 360° phase shifter design in Ku and Ka bands

Abstract

radiation patterns of the proposed antenna in the two orthogonal planes at the two design frequencies of 0.9 and 1.8 GHz. The measured antenna gains are 2.65 and 4.1 dBi at the lower and upper resonant frequencies, respectively. As shown in the XZplane patterns, the proposed monopole with the ground shorted inset sleeve has omni-directional radiation patterns at both design frequencies. Figure 4 shows the measured return losses of the proposed monopole antenna with resonant frequency tunability. It can be seen that the PISMA has dual resonant modes with increasing inset sleeve length. In the case of all diodes off, the measured 10 dB impedance bandwidth at the lower resonant mode is 30 MHz (0.63-0.66 GHz), which is about 4.65% with respect to the center frequency of 0.645 GHz. At the upper band, the impedance bandwidth is 480 MHz (1.43-1.91 GHz), which is about 28.7% centered at 1.67 GHz. The measured radiation patterns in the two orthogonal planes at both design frequencies of 0.65 and 1.75 GHz are plotted in Figures 5(a) and 5(b), respectively. From Figure 5, it can be seen that the omnidirectional radiation patterns in the XZ-plane are similar to those of the conventional monopole and the model shown in Figure 1(a). The measured peak gains at the lower and upper frequencies are 2.1 and 1.8 dBi, respectively. CONCLUSIONSThe CPW-fed PISMA with dual-band tunability is proposed in the letter. It uses the ground shorted inset sleeve of which the length is controlled by the PIN diode. Because the ground shorted inset sleeve leads to both the resonant mode by the virtual feed and the additional resonant mode in the upper band, dual-band operation can be easily achieved without any additional metal strips. Also, the proposed monopole antenna can produce the omni-directional radiation pattern at the two design frequencies.ABSTRACT: This article presents a new reflection-type 360 phase shifter, for Ku-and Ka-bands applications. At 12 GHz, the measured prototype has more than 360 phase shift with insertion loss of 3.3 6 0.5 dB. For the Ka-band circuit, the lowest insertion loss is obtained at 30.3 GHz (3.6 dB 6 1.8 dB) and the phase shift is 315 .ABSTRACT: This article presents the design of a novel unequal Wilkinson power divider for dual-band operation. The proposed power divider can operate at arbitrary two frequencies without reactive components. The design parameters of the dual-band power divider are presented in explicit closed form. The validity of this analysis is confirmed through the design, simulation, and experimental results with a power divider for 1 and 2.5 GHz. The experimental results show that the designed unequal power divider fulfills all the features of a conventional Wilkinson power divider.

Beamforming Phased Array Antenna toward Indoor Positioning Applications

“…Reflection type phase shifter comprises a 3-dB hybrid couple and two tunable loads, as shown in Figure 9d. By selecting the appropriate load, this type can shift more than 360°continuously and has low insertion loss, like in [24][25][26]. From requirement of phase shifter, it is obvious that reflection type phase shifter with full 360°and continuous phase shift is the most appropriate choice for this phased array antenna system.…”

“…Types of phase shifter: (a) switched line; (b) switched network; (c) loaded line; (d) reflection type[24][25][26].…”

A low-cost wideband phase shifter for two-way mm-wave phased array antenna system

“…The analog MEMS phase shifters are large and show a low figure of merit (FOM) [4–7]. Passive-type monolithic microwave-integrated circuit phase shifters suffer from high insertion loss, limited resolution, and limited operating bandwidth [8–12]. An alternative approach is to use tunable dielectric-based phase shifters such as ferroelectrics [13–16], and liquid crystal (LC) [17–19].…”

Design of electrically tunable phase shifter for antenna arrays operating in Ku-band

“…To achieve switched beam antenna, numerous researches propose a feed network for phased arrays which integrates functions of power divider and phase shifter into one structure. Its feeding circuit consists of a branch-line coupler phase shifter using varactor diodes to independently control the output phases [5][6][7][8].…”