Compact Ultra-Wideband Phase Inverter Using Microstrip-CPW-Slotline Transitions

Abstract

A planar ultra-wideband phase inverter, which consists of a series of transitions between microstrip, coplanar waveguide, and slotline, is designed and implemented. This compact-sized phase inverter can be used to generate wideband 180° phase differential signals, especially at high microwave frequencies up to millimeter-waves. The design is based on the impedance matching and smooth field transformation between the transitional stages. The fabricated transition has dimensions of 7.36 mm × 5.08 mm, and provides ultra-wide frequency bandwidth from 13 GHz to 38 GHz with low insertion loss of better than 2 dB within ±5° phase deviation and with return loss of greater than 10 dB.

Phase inverter design using substrate‐integrated coaxial line with wideband performance

“…Unlike TL-based phase inversion, PIs are less frequency sensitive and occupy much less space. As a result, PIs are vital components in constructing compact rat-race hybrid couplers and magic-T's [1][2][3][4][5][6][7] that aim to maintain wideband performance. Previous PI designs have been implemented using various transmission-line technologies, including coplanar waveguides [1][2][3]5 , coplanar striplines 2,5 , microstrips 4,6 , and a combination of multiple line transitions 7 .…”

“…As a result, PIs are vital components in constructing compact rat-race hybrid couplers and magic-T's [1][2][3][4][5][6][7] that aim to maintain wideband performance. Previous PI designs have been implemented using various transmission-line technologies, including coplanar waveguides [1][2][3]5 , coplanar striplines 2,5 , microstrips 4,6 , and a combination of multiple line transitions 7 . Except for microstrip PIs, most PI structures share a typical configuration: the uniplanar structure in which the signal strip and the ground are on the same plane.…”

Tri-Band Bandpass Filter Using Mixed Short/Open Circuited Stubs and Q-Factor With Controllable Bandwidth for Was, Ism, and 5g Applications

“…Designers' innovative ideas allowed several filters' shapes such as square [36,37], T-shapes, L-shapes, and U-shapes [6,37]. The technology process of fabrication can be in coplanar [38] or microstrip [37,39] configuration. The use of transmission-lines in the microwave domain for planar circuits can be terminated by open-circuit [40], short-circuit, or mixing configurations [41,42].…”