Abstract
In this paper, the gap waveguide technology is examined for packaging liquid crystal (LC) in tunable microwave devices. For this purpose, a line based passive phase shifter is designed and implemented in a ridge gap waveguide (RGW) topology and filled with LC serving as functional material. The inherent direct current (DC) decoupling property of gap waveguides is used to utilize the waveguide surroundings as biasing electrodes for tuning the LC. The bed of nails structure of the RGW exhibits an E-field suppression of 76 dB in simulation, forming a completely shielded device. The phase shifter shows a maximum figure of merit (FoM) of 70 °/dB from 20 GHz to 30 GHz with a differential phase shift of 387° at 25 GHz. The insertion loss ranges from 3.5 dB to 5.5 dB depending on the applied biasing voltage of 0 V to 60 V.
Highlights
Nowadays, the development in communication is already driven by mobility/portability and data rate, which will be emphasized even more by future applications such as IoT, industrial digitization, 5G or autonomous driving
In this paper, the gap waveguide technology is examined for packaging liquid crystal (LC) in tunable microwave devices
A line based passive phase shifter is designed and implemented in a ridge gap waveguide (RGW) topology and filled with LC serving as functional material
Summary
The development in communication is already driven by mobility/portability and data rate, which will be emphasized even more by future applications such as IoT, industrial digitization, 5G or autonomous driving. For concepts like cognitive radio or high data rate wireless communication, flexible filtering in the frequency or spatial domain is required. This poses additional challenges for the radio frequency (RF) frontend design. Varactors and phase shifters are a key component to realize tunable filters and beamsteering antennas. This work focuses on a line-based passive phase shifter, utilizing a functional material. These kind of phase shifters are appealing due to their ease of design: They consist only
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