Abstract
In today’s mobile device market, there is a strong need for efficient antenna miniaturization. Tunable antennas are a very promising way to reduce antenna volume while enlarging its operating bandwidth. MEMS tunable capacitors are state-of-the-art in terms of insertion loss. Their characteristics are used in this investigation. This paper uses field simulations to highlight the trade-offs between the design of the tuner and the design of the antenna, especially the impact of the location of the tuner and the degree of miniaturization. Codesigning the tuner and the antenna is essential to optimize radiated performance.
Highlights
With their increasing functionality, mobile phones are embedding better screens, better cameras, larger batteries, and more antennas, among others
Chipset miniaturization has seen a large success over the last years [1]; antenna volume is ruled by fundamental laws [2] that relate size, efficiency, and bandwidth
To support the latest mobile communication standards, long-term evolution (LTE), and LTE-advanced (LTE-A), the antennas need to operate in frequency bands ranging from 698 MHz to 2.690 GHz
Summary
Mobile phones are embedding better screens, better cameras, larger batteries, and more antennas, among others. To support the latest mobile communication standards, long-term evolution (LTE), and LTE-advanced (LTE-A), the antennas need to operate in frequency bands ranging from 698 MHz to 2.690 GHz. In order to maintain good performance throughout such a large bandwidth with a conventional design, the antenna volume must be increased. The most common types of antenna designs for mobile phones are classified into two categories: selfresonating elements and nonresonating elements ( known as capacitive coupling elements). Literature reports a coverage up to 9 simultaneous bands. These antennas are space consuming as the antenna volume increases nearly linearly with the number of bands supported
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