# Antenna Booster Element for Multiband Operation

## TL;DR

This paper presents a compact antenna booster element designed to enable multiband operation for IoT devices, covering both low and high-frequency ranges.

## Contribution

The novelty lies in the design of a PCB-integrated antenna booster element with a band-reject filter for multiband performance.

## Key findings

- The proposed antenna covers LFR (698-960 MHz) and HFR (1710-2690 MHz) frequencies.
- A prototype was built to validate the theoretical analysis and bandwidth optimization.
- The design achieves multiband operation within a compact physical footprint.

## Abstract

The escalating demand for versatile wireless devices has fostered the need to reduce the antenna footprint to support the integration of multiple new functionalities. This poses a significant challenge for the Internet of things (IoT) antenna designers tasked with creating antennas capable of supporting multiband operation within physical constraints. This work aims to address this challenge by focusing on the optimization of an antenna booster element to achieve multiband performance, accomplished through the design of a band-reject filter. This proposal entails a printed circuit board (PCB) measuring 142 mm × 60 mm, with a clearance area of 12 mm × 40 mm, incorporating an antenna booster element of 30 mm × 3 mm × 1 mm (0.07 λ). This configuration covers frequencies in the LFR (low-frequency range) from 698 MHz to 960 MHz and the HFR (high-frequency range) from 1710 MHz to 2690 MHz. A theoretical analysis is conducted to optimize bandwidth in both frequency regions. Finally, a prototype validates the analytic results.