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This paper presents a new application field of a giant magneto-impedance (GMI) sensor. It shows valuable findings for the GMI sensor on the possibility of a new receiving element in magnetic field communication. The proposed GMI sensors serve as antennas and mixers in receiver systems. They have the advantage of being easily implemented and in terms of mass production and manufacturing processes due to the manufacture base on a printed circuit board (PCB). Their smaller size, lower cost, and higher sensitivity have more advantages than conventional magnetic sensors, such as the magneto-inductive, anisotropic magneto-resistive, and giant magneto-resistive sensors. Two types of PCB-based GMI sensors are proposed. The first type of GMI sensor is directly wound around the solenoid-shaped pickup coil onto an alumina insulation tube inserted with an amorphous microwire. The second type of GMI sensor has a patterned pickup coil that does not require the winding of the coil, similar to the patterned pickup coil of a micro electro-mechanical system-based GMI sensor. This GMI sensor provides a new geometry that can be easily manufactured with two PCB substrates. The proposed GMI sensors achieve the equivalent magnetic noise spectral density to the high-sensitivity characteristics of the pT/√Hz level. The equivalent magnetic noise spectral density of 1.5 pT/√Hz at 20.03 MHz is obtained for the first type of GMI sensor, and 3 pT/√Hz at 3.03 MHz is achieved the second type. The analyzed results of the bandwidth and the channel capacity for the two types of GMI sensors are acceptable. This first analysis confirms the possibility of the implementation of GMI sensors in magnetic field communication. The results of this experiment confirm the high performance of the proposed GMI sensors and their applicability in magnetic field communication. The detailed experimental results of the proposed GMI sensors are presented and discussed. INDEX TERMS Amorphous microwire, giant magneto-impedance (GMI), high sensitivity, magnetic field communication, magnetic sensor.

A new single waveguide cell for EMC testing, the uniform area of which is 0.216 × 0.296 m, is presented. It is possible to change easily the polarisation of standard EM fields, such as the TTEM cell. The field uniformitiy of the proposed waveguide cell is compared to that of the TTEM cell. It is shown that it provides the standard EM fields with high field uniformity in dual polarisations simultaneously. Introduction: Many kinds of transverse electromagnetic (TEM) cells have been developed recently. The presented cells can be divided into two kinds, a single waveguide (SW) cell and a double waveguide (DW) cell. The DW cell has input and output ports in double sides of cells, such as the symmetric TEM cell [1], coupled transmission line (CTL) cell [2] and three dimension TEM cell [3]. These models are restricted in frequency range up to the first resonant frequency. However, the SW cell, such as the gigaherze transverse electromagnetic (GTEM) cell [4] and triple-TEM (TTEM) cell [5], has wideband characteristics. In the SW cells, the TTEM cell is able to provide an additional electric field polarisation in the transverse section compared with the GTEM cell. The TTEM cell has poor field uniformity in the transverse section because it has only two separate perpendicular septums. Therefore, a new SW cell to provide the standard EM fields with high field uniformity and double polarisations is presented in this Letter. As shown in Fig.1a, the proposed SW cell has the mixed type of CTL cell and GTEM cell. It consists of a rectangular outer conductor (C 4 ) tapered like the GTEM cell and three inner conductors (C 1 , C 2 , C 3 ) located inside the cell. We can change the polarisation with the choice of the feeding conductors (C 2 and C 3 out of phase [2] for vertical polarisation; C 1 for horizontal polarisation). The other conductors are terminated with 50 V.

This study presents a broadband double‐ridged horn antenna for millimeter‐wave applications. The proposed broadband antenna has a bandwidth of 12.1–63.2 GHz and peak radiation gain of 12.1–19.8 dBi. The performance of this antenna is verified by the measured results and is in good agreement with the simulated results. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2165–2167, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21884