Silicon Laboratories Inc.

Tuomas Hänninen

Pasi Rahikkala

Attila Zolomy

Attila Zólomy

Sebastien Cerdan

A dual band antenna structure is disclosed. The dual band antenna structure utilizes features from loop ground edge radiating antennas and inverted-F antennas to create an antenna that has two resonance frequencies. The dual band antenna structure includes a loop ground edge radiating antenna, which has a first resonance frequency. A monopole branch is also located at the end of the feeding trace to provide a second resonance frequency. The dual band antenna structure is useful for network devices that operate at multiple frequencies, such as those using the WiFi/BLE/IEEE802.15.4 protocols.

Dual band loop and inverted-F ground edge radiating antenna structure

A method for operating a wireless communications device having a low energy mode of operation and a second mode of operation includes providing a first clock signal and a second clock signal in the second mode of operation. The first clock signal has a first frequency within a first frequency offset range. The second clock signal has a second frequency within a second frequency offset range. The first frequency is lower than the second frequency, and the first frequency offset range is greater than the second frequency offset range. The method includes generating a calibrated version of the first clock signal in the second mode of operation using a measurement of the first clock signal measured using a timer controlled by the second clock signal. The method includes using the calibrated version of the first clock signal in the low energy mode while the second clock signal is disabled.

Calibration of a low frequency oscillator using a high frequency oscillator as a reference clock

An apparatus includes a module. The module includes an antenna structure. The antenna structure includes a printed monopole antenna. The antenna structure further includes first and second inductive-capacitive (LC) resonant networks that are coupled to the printed monopole antenna. The antenna structure further includes a double slotted loop coupled to the first and second LC resonant networks.

Antenna structure with double-slotted loop and associated methods

An apparatus includes a module comprising an antenna having at least one antenna component. The apparatus further includes at least one tuning component coupled to the at least one antenna component. The at least one tuning component is external to the module.

Apparatus for antenna optimization and associated methods

An apparatus includes a module. The module includes a radio frequency (RF) circuit to transmit or receive RF signals, and a loop antenna to transmit or receive the RF signals. The module further comprises an impedance matching circuit coupled to the RF circuit and to the loop antenna. The impedance matching circuit comprises lumped reactive components.

Apparatus with partitioned radio frequency antenna and matching network and associated methods

A loop type ground radiating antenna having dual resonance is disclosed. The antenna including a feeding path that traverses the ground clearance, creating a first portion and a second portion. One or more first capacitors are disposed along a first conductive path between the ground clearance and the edge of the ground layer, proximate the first portion, while one or more second capacitors are disposed along a second conductive path between the ground clearance and the edge of the ground layer, proximate the second portion. An input capacitor is used to feed the feeding path. The values of the input capacitor and the first capacitors determine a resonant frequency of the first feeding loop, while the values of the input capacitor and the second capacitors determine a resonant frequency of the second feeding loop. By proper selection of the capacitor values, a wide bandwidth may be created.

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Helsinki, Finland

Tuomas Hänninen