Abstract
The co-existence of millimeter-wave (mm-wave) and sub-6GHz antennas in a smartphone presents many performance-limiting aspects. When both antennas are attached to the metal frame, the feed lines of the mm-wave antennas might short-circuit the sub-6GHz antennas, and thus, may significantly affect their performance. This paper presents a method to design feed lines that function as transmission lines at mm-wave frequencies but correspond to open circuits at sub-6GHz. This study determines, in theory, the smallest achievable capacitive loading with different line types and experimentally validates the approach. The capacitive loading due to the feed line is small enough to maintain the sub-6GHz performance. At the mm-wave band, the insertion loss of the line is 1dB with a measured reflection coefficient below −10dB. The introduced common-mode capacitive load of the feed line on the sub-6GHz antennas corresponds to 0.19pF capacitance.
Highlights
The connected world has developed significantly in the past decades but within the last few years
This paper presented a dual-polarized slot antenna array that supports dualband communications
This paper presented a theoretical model and a practical realization of a mm-wave feed line that does not short the sub-6 GHz antennas
Summary
The connected world has developed significantly in the past decades but within the last few years. The world is going through the Fourth Industrial Revolution, which includes the efficient combination of hardware and software with network technologies and connectivity. Typical examples of such applications are machine-to-machine (M2M) communications, autonomous vehicles, and the Internet of Things (IoT). 3. The first mobile phone antenna design, in which the LTE and mm-wave antennas are combined in a shared volume [IV]–[V]. 4. A feed line concept and design method that improves the integration of mm-wave and sub-6 GHz antennas in metal-framed handsets [VI]. To emphasize the scientific contribution of this thesis, only the most important content from the publications is included in the overview. The publications at the end contain more details about the presented designs and results
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