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Recently, a measurement technique called S-parameter method using a vector network analyzer has been proposed whereby the differential impedance can be found. In this paper, three compensating methods using ABCD-matrix are adopted to reduce the influence of a jig for the S-parameter method. The results of our proposed methods are presented and compared with a calculated result using the method of...
In recent years, many wireless telecommunication services have spread over the world. It is known that the characteristics of conventional antennas, such as monopole antennas, change considerably when the body of the handset is touched by the hand. This is caused by the variation of the current on the surface of the conducting box used for the handset due to human body influence. To decrease the influence...
The crosstalk between microstrip lines placed closely on a printed circuit board is an important issue. Recently, a lack (a slot) formed in a ground plane may be serious problem for the crosstalk or EMI, because of miniaturization of electronic equipment and printed boards, and high-density of circuits. In this paper, we analyzed the influence of crosstalk between two microstrip lines by placing the...
By advance of miniaturization of electronic devices, a ground of a printed circuit board is tend to be small and complicated and the ground may have some defects, such as connectors or clearance halls of vias. In this paper, we analyze the coupling between a microstrip line and a slot in a ground on a PCB using the MTL method to examine an effect of the signal integrity for the slot in the ground...
By advance of miniaturization of electronic devices, a ground of a printed circuit board is tend to be small and complicated and the ground may have some defects, such as connectors or clearance halls of vias. In this paper, we analyze the coupling between a microstrip line and a slot in a ground on a PCB using the MTL method to examine an effect of the signal integrity for the slot in the ground...
A new device structure based on microstrip line (MSL) is proposed to realize the MMW liquid crystal phase shifter. Fundamental characteristics for various device structures are evaluated by using FDTD Method. Here, we investigate in detail about the influence of "through hole" to the MMW propagation, which is the key component of the new device.
A balanced fed antenna for the portable radio terminal is received increasing attention due to reduction of the human influence. Recently, a technique called S-parameter method using a standard network analyzer has been proposed whereby the differential impedance can be found. In this paper, four compensating methods using cascade matrices are adopted to reduce the influence of a jig for the S-parameter...
In this paper, in order to clarify the influence of the human body on the radio wave propagation of the wearable device for on-body wireless communications, we have derived transmission coefficient analytically, and have evaluated the digital communication using the ISM band of 915 MHz and the UWB band in terms of BER. Due to the propagation characteristic of the wearable device attached to an arm,...
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