THESIS
2023
1 online resource (x, 53 pages) : illustrations (some color)
Abstract
The wireless body area network (WBAN) has gained significant attention over the past few
decades due to its ability to offer seamless and real-time healthcare and fitness monitoring,
allowing patients to go about their daily activities without any constraints.
Designing high radiation efficiency antennas for wearable devices presents a challenge due to
the close proximity to the human body, which causes loading effects due to the lossy nature of
body tissues. Additionally, the demand for lightweight, low-cost, maintenance-free, and easy-to-install antennas further complicates the design process.
Firstly, a compact QMSIW antenna with a proposed bandwidth enhancement technique is
presented, and this technique broaden the bandwidth by 108% as compared to conventional
SIW structure. The mea...[
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The wireless body area network (WBAN) has gained significant attention over the past few
decades due to its ability to offer seamless and real-time healthcare and fitness monitoring,
allowing patients to go about their daily activities without any constraints.
Designing high radiation efficiency antennas for wearable devices presents a challenge due to
the close proximity to the human body, which causes loading effects due to the lossy nature of
body tissues. Additionally, the demand for lightweight, low-cost, maintenance-free, and easy-to-install antennas further complicates the design process.
Firstly, a compact QMSIW antenna with a proposed bandwidth enhancement technique is
presented, and this technique broaden the bandwidth by 108% as compared to conventional
SIW structure. The measured on/off-body channel with the designed antenna provides usable
experimental data for link budget estimation in transceiver system design.
Secondly, a new zero-IF PTRX that incorporates a passive four-stage cascading double
balanced sub-harmonic mixer for phase detection is proposed. This architecture can effectively
address the phase-pulling issue resulting from interference and on-chip coupling, and
meanwhile minimize the power consumption of the VCO. Additionally, a 4-stage differential
ring oscillator with 8 phases for sub-harmonic operation and a low-power inductor-less low
noise amplifier (LNA) are incorporated to minimize the active die area.
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