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Recently, the S-parameter method, which is the measurement method of the input impedance of the balanced antenna, has been proposed. However, when the measured frequency rises, measurement accuracy decreases because the influence of the jig cannot be disregarded. To eliminate an influence of the measurement jig, we have proposed the modified open correction using the ABCD-matrix. In this report, to...
Recently, the S-parameter method using a vector network analyzer was proposed whereby the differential input impedance of a balanced-fed antenna was obtained. To improve measurement accuracy of the S-parameter method, the dependence on the thickness of the semi-rigid cable used for the measurement jig is obtained from the results of calculations using the FDTD method. Three types of jigs each made...
Recently, 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 ground slots. In this paper, we calculated electromagnetic coupling between microstrip lines on different layers in 3 layers printed circuit board with a narrow ground slot. To calculate electromagnetic coupling between...
Recently, electric circuits may be become small, and also high-density electrical technologies have advanced. In order to place many elements on the small printed circuit board (PCB), a high-density multi-layered PCB may be used. Many vias are used in such multi-layered PCB to connect lines on each layer. If many vias are placed in narrow area, they make ground slots. If a ground slot exists near...
By advance of miniaturization of electronic devices, grounds of a printed circuit board are tend to be small and complicated and may have some defects, such as connectors or clearance halls of vias. In this paper, we analyzed the electromagnetic coupling between a microstrip line and a slot in a ground on a PCB using the multi-conductor transmission lines method to examine the signal integrity of...
Recently, the S-parameter method using a vector network analyzer and a measurement jig instead of a balun was proposed whereby the differential input impedance of a balanced-fed antenna were obtained. As no balun is used, measuring impedance over a wide frequency bandwidth is now possible. To improve measurement accuracy of the S-parameter method, the dependence on thickness of the semi-rigid cable...
Recently, the S-parameter method using a vector network analyzer was proposed whereby the differential input impedance of a balanced-fed antenna were obtained. To improve measurement accuracy of the S-parameter method, the dependence on thickness of the semi-rigid cable used for the measurement jig is obtained from the results of calculations using the FDTD method. Three types of jigs each made from...
Recently, the S-parameter method using a vector network analyzer and a measurement jig instead of a balun was proposed whereby the differential input impedance of a balanced-fed antenna were obtained. As no balun is used, measuring impedance over a wide frequency bandwidth is now possible. To improve the measurement accuracy of the S-parameter method, the dependence on direction of SMA connectors...
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 voltage of a ground slot placed nearby two microstrip lines using the MTL method to examine an effect of the coupling of the slot in the ground. To calculate...
Recently, S-parameter method that is the measurement method of the input impedance of the balanced antenna is proposed. It is a problem of this method that the jig influences measured value when the measurement frequency increases. To remove the influence of the jig, we have examined compensating method using the ABCD-matrix. In this report, to verify the accuracy of the S-parameter method compensated...
We present the use of radio markers for a lane-keeping support system. This system allows safe driving even in blizzards or thick fog. In this system, we use the 429MHz band and 1.2GHz band specified low power radio devices to reduce power consumptions. We measured the packet error rate and receive signal level under snowy conditions, and we obtained packet error rate of 0% and 100m transmission range...
Recently, S-parameter method that is the measuring method of the input impedance of the balanced antenna with a vector network analyzer is proposed. The method requires a jig composed of two unbalanced feed lines such as microstrip lines. The jig must be calibrated to achieve accurate results especially at high frequencies. To remove the influence of the jig, we have proposed the open correction and...
Recently, S-parameter method that is the measurement method of the input impedance of the balanced antenna is proposed. It is a problem of this method that the jig influences measured value when the measurement frequency increases. To remove the influence of the jig, we have examined compensating method using the ABCD-matrix. In this report, to remove the influence of the jig, we propose a novel open...
Recently, S-parameter method that is the measuring method of the input impedance of the balanced antenna with a vector network analyzer is proposed. It is a problem of this method that the jig influences measured value when the measuring frequency in-creases. To remove the influence of the jig, we have examined compensating method using the ABCD-matrix. In this report, we examine the effect of the...
By advance of miniaturization of electronic devices, a ground plane of a printed circuit board is tend to be small and complicated and the ground plane may have some defects, such as connectors or clearance halls of vias. In this paper, we analyzed 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 crosstalk between microstrip lines placed closely on a printed circuit board is an important problem. Recently, a slot which is formed in a ground plane induces undesired influence to the crosstalk between lines. Accordingly, understanding the influence of the slot is important. In this paper, the authors have analyzed the influence for the crosstalk between microstrip lines by changing widths...
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 crosstalk between microstrip lines on a PCB with a ground slot along lines using the MTL method to examine an effect of the crosstalk for the slot in the ground...
This paper presents a linearity improvement of an envelope tracking (ET) power amplifier by controlling not only the drain voltage but also the gate voltage. These voltages are dynamically controlled according to the input envelope. It has already reported that the linearity characteristics of the microwave amplifiers change depending on the operating gate voltage. We adopted this gate voltage control...
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...
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