Characteristics of Cavity Slot Antenna for Body-Area Networks

2009 ◽  
Vol 57 (4) ◽  
pp. 837-843 ◽  
Author(s):  
Nozomi Haga ◽  
Kazuyuki Saito ◽  
Masaharu Takahashi ◽  
Koichi Ito
Keyword(s):  
Body Area Networks ◽  
Slot Antenna ◽  
Body Area

scholarly journals Active Compact Wearable Body Area Networks for Wireless Communication, Medical and IoT Applications

2018 ◽  
Vol 1 (4) ◽  
pp. 46 ◽  
Author(s):  
Albert Sabban
Keyword(s):  
Resonant Frequency ◽  
Bias Voltage ◽  
Body Area Networks ◽  
Electrical Performance ◽  
Slot Antenna ◽  
Antenna Gain ◽  
Body Area ◽  
Wearable Antennas ◽  
Dual Polarized ◽  
Dual Polarized Antenna

The development of compact wearable antennas and transceivers for communication, IoT (Internet of Things), and biomedical systems will be presented in this paper. Development of Compact efficient wearable antennas is one of the major challenges in development of wearable communication, IoT, and medical systems. The main goal of wireless body area networks (BANs), WBANs, is to provide continuously medical data to the physician. Body area network (BAN) antennas should be flexible, lightweight, compact, and have low production cost. However, low efficiency is the major disadvantage of small printed antennas. Microstrip antennas resonant frequency is altered, due to environment conditions, different antenna locations, and different system operation modes. These disadvantages may be solved by using compact active and tunable antennas. A new class of wideband active wearable antennas for medical applications is presented in this paper. Amplifiers may be connected to the wearable antenna feed line to increase the system dynamic range. Small lightweight batteries supply the bias voltage to the active components. An active dual polarized antenna is presented in this paper. The active dual polarized antenna gain is 14 ± 3 dB for frequencies ranging from 380 to 600 MHz. The active transmitting dual polarized antenna output power is around 18 dBm. A voltage-controlled diode, varactor, may be used to control the antenna electrical performance at different environments. For example, an antenna located in patient stomach area has VSWR (Voltage Standing Wave Ratio) better than 2:1 at 434 MHz. However, if the antenna will be placed on the patient back, it may resonate at 420 MHz. By varying the varactor bias voltage, the antenna resonant frequency may be shifted from 420 to 434 MHz. An ultra-wideband passive and active printed slot antenna may be employed in wideband wearable communication systems. The active slot antenna gain is 13 ± 2 dB for frequencies from 800 MHz to 3 GHz.

Body Area Networks

2009 ◽  
Author(s):  
Sandeep K. S. Gupta ◽  
Tridib Mukherjee ◽  
Krishna Kumar Venkatasubramanian
Keyword(s):  
Body Area Networks ◽  
Body Area
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