Miniature Dipole Antenna for Active Near-Field Sensor

Integrated active miniature sensors for electro-magnetic near field measurement

“…Fig. I shows a 100 11m square loop with 5 11m trace width [4] and a dipole with 100 11m arm length [5]. Using the back-side metal and via-hole option, also a vertical loop as shown in fig.…”

“…For 50 n loaded condition, the planar dipole and loop deliver about 0.8 11 V and I I1V at 5 GHz. More data for the planar loop, vertical loop and planar dipole can be found in[4,5,9].III. BROAD BAND AMPLIFIERS AND ACTIVE SENSORSThree stage differential broad band amplifiers comprising dc coupling via source follower buffers are developed for later integration.…”

A Novel Tangential Electric-Field Sensor Based on Electric Dipole and Integrated Balun for the Near-Field Measurement Covering GPS Band

“…An electrically small loop, used as the sensing part for the magnetic-field sensor, can respond positively to the magnetic-field component oriented normally to the surface of the loop [9,10,11]. An open-ended monopole can be employed to pick up the normal electric field [12,13,14,15], while the electrically small electric dipole is utilized to detect the tangential electric field [16,17,18] over a surface above the planar circuit. The electromagnetic sensors can effectively sense electromagnetic fields so that there has been increasing attention given to developing high-performance electric-/magnetic-field sensors, such as extending the bandwidth [19,20,21], improving the spatial resolution [22,23,24] and enhancing the sensitivity [25,26,27,28].…”

Toroidal resonances in terahertz metamaterials

“…For instance, broad resonance that scatters strongly is used as antenna or for signal enhancement in MRI. 50,51 Alternatively, narrower linewidth resonance could be used as dielectric sensor or as a probe to explore resonant light-matter interaction in coupled system. 52 Further, to investigate the radiative loss channel electromagnetic excitation could be understood in terms of multipole analysis.…”