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In present-day microwave communication systems and radar systems, it is important to be able to precisely and accurately control the phase of the transmitted waveform of the electromagnetic spectrum.
For example, in such systems it is usually necessary to transmit a waveform in a specific relationship with respect to a reference signal. For example, in a radars system it is usually necessary that the transmit and receive antenna phases be precisely matched at the beginning of the transmission to avoid serious error terms in the received signal.
The exact phase control of antenna phases is the basis for microwave beam forming and is particularly important in radar systems.
There are two primary ways of accomplishing the precise phase control of transmit antennas in a microwave system. The first is to precisely position the antenna by physically moving it in space. The second is to position the antenna to control the phase.
Both techniques have their advantages and disadvantages. The first technique, as known, is usually quite costly, bulky, and difficult to integrate with the microwave system. The second technique is usually better integrated with the microwave system and thus much less costly.
In the method of phase control the antenna phase is usually controlled by varying either the phase of the emitted signal or the phase of the reflected signal, or both, in the same RF field. These phases, which are typically differing by one quarter of a RF period, can be varied at the same time in the same RF field by so-called phase-shifting using active circuits.
Optimal performance is obtained when the reflected antenna phase is equal and opposite to the emitted signal phase.
Methods of phase control, which have been used heretofore, are largely based on the concept of modulating the amplitude of the RF signal. This technique is at best an approximation to phase-shifting and is usually poor.
It is an object of the present invention to control the antenna phase with a highly accurate, much more precise, and easily implemented phase-shifting technique.
It is a further object of the present invention to control the antenna phase by a process of continuous phase modulation using a phase-shifting technique.
It is a still further object of the present invention to provide a phase-shifting technique which is an alternative to the phase modulation used heretofore in the art.1. Field of the Invention
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How to add 6 hours to the current date in php
How to add 6 hours to the current date in php using below code:
$t = date(“Y-m-d”). $code. ” 23:59″;
If there is an interval of time between 23:59 and 06:00, then that time should be added to the current date.
Your $t variable is a string. If you want to concatenate strings, you need to use.=:
$t = date(“Y-m-d”). $code. ” 23:59″;
$t = $t.’06:00′;
The use of’means the string gets interpreted as a number.
The use of.= means the string gets appended.
Try this –
The reemergence of the middle class has changed the way we live our lives. Now Americans are enjoying a rise in living standards that most of them haven’t seen in a long time.
The average American has never been wealthier. But the mid-2000s were a different story. The share of Americans living in poverty — defined as having an income below $22,314 for a family of four — had jumped to a 35-year high of 15 percent, according to government data. It has fallen to 11.9 percent.
Not only has the portion of Americans living in poverty declined, but the number has also fallen as a percentage of the entire population — from 16.7 percent to 12.7 percent.
The decline has had a major impact on the housing market and real estate in general.
Consider, for instance, that home prices in mid-2007 peaked at about $203,000. By the end of 2008, prices had already started to drop. But it wasn’t until the middle of last year — when prices