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Professor Michael Bank E-mail: bankmichael1@gmail.com

www.OFDMA-manfred.com and www.SLEINT.com

Two faces Janus The Israel Museum,

Jerusalem

One face is betterMuseum visitor

One-Way Electric LineHigh Frequency

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High-Frequency One-Wire Line

On high frequencies the A-line is long line submitting to telegraph equitation.Let us show that B-line idea is correct for the high frequency too.

If so then we can the long line fragment change by one wire line.

Previous simulations where current by ADS program. This program allows simulating different elements but not electrical lines. For electrical lines simulations was used delay line.On height frequencies one can implement CST program. This program allows simulating different elements including electrical lines. We can implement one wire line instead of two wires matching lines

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Inverter Inverter

Instead of using two or more channels

We can use one channel in high frequency systems also

+/- +/-

+/-

+/-

+/- +/-

-/+ -/+

-/+ -/+

30 mm

300 mmRin = 300 Ohms Rout = 300 Ohms

1 V 0 V

Model 1

Let us as a prototype (model 1) two wires long line with characteristic impedance ≈ 300 Ohm

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On frequencies more than one GHz is better to use inverter by Strip Line. This Strip Line was used on following simulations.

Model 2

S11

S21

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The matching line is infinitely wide band pass. This is an advantage, but also disadvantages.Advantages because you can pass on a long line of multiple signals with different frequencies.However, in a real system there is always some noise. Even if he is weak, but in an infinitely wide band will be infinitely large noise (of course, if the noise is white). Due to Shannon's theory on such a channel can not transmit information.Of course, you can apply a filter at the input of the receiver. But this is often problematic. The filter introduces loss and increases the noise factor.The proposed single-wire system (B-Line) is a selective system

The disadvantage of B-Line is a need to change the delay line in case of change of frequency.

B-Line is compatible with the source and load, and in this sense no different from the usual long line. It is selective, but rather broadband. It has no requirements of symmetry, which is often a problem when using long line inside the apparatus.

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MB antenna is the equivalent full dipole, and not half-wave, as is usually applied. In the case of a monopole or dipole at the end emitters current is equal to zero, and this dramatically reduces the efficiency of the antennas. At low frequencies to compensate for this effect is used umbrella antenna, T-shaped antenna, antenna with top power, multi-antenna and so on. In contrast to the known solutions the equivalent of half-wave (or rather the wave) MB antenna you can see on Fig.At point A the current is not terminated, it continues to flow to the source.Lines AB and CD equipotential, and they can be combined. Generator “sees” both ends of the system and gives maximal power. The delay line is small and shielded so that it does not radiate.That is, the MBA allows to implement a PCB radiator of height /2, rather than /4, i.e. the MBA is equivalent to a full dipole. This result is verified by simulations.

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PCB

Strip Line

Vgout = 1V, Rout = 15 Ohm, Distance 1 m. E = 9.872 V/m ! This is much more than give a monopole or dipole

Let us note some important advantages of high frequency B-line.

• The line is not so critical to the matching with the load resistance.

• It is difficult to achieve ideal symmetrical two wires long line inside of small device. Non symmetrical can lead to intersymbol interferences For one wire long line the symmetrical is not a problem.

• Long B-line has a resonance properties. This can help to achieving good interference immunity. At the same time the line is broadband enough.

• One of useful antennas is dipole, where the presence of the two beams interfere with the use of dipole as a small device antenna. B-line idea by

MB antenna* can help to solve this problem.

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* M. Bank, M. Haridim, V. Tsingouz, Z. Ibragimov, “Highly effective handset antenna”, Int’l. J. of Communications, 6(2), 2012 (80-87),