7/2/2023 0 Comments Antenna tuner simulatorBut this may not be the true in Antenna case. Ii) When we think about Gain, the higher the gain is, the higher the total amount of energy coming out of the device is. Most of Antenna is 'passive device' which does not amplify anything. I) When we hear the term 'Gain', we usually think 'this device would amplify a signal to make it bigger energy'. Personally I think the 'Antenna Gain' is a misleading term because So in many case, we cut through the 3D pattern along a specific 2D plane as shown in (c) and (d). However, it is not always easy to represent the propagation patterns in 3D and sometimes it is even harder to estimate the energy propagation quantatively when it is plotted in 3D. In reality, the signal radiate into 3 Dimensional Direction as illustrated (b) in the following figure. The goal of antenna design is to make it so that it transmit the energy in the pattern that I want without any energy loss during the conversion from electrical energy to electromagnetic engergy. In reality, you can think about almost infinite number of different pattern. (For more practical example of Radiation Pattern, refer to )įollowing is only some example of possible radiation pattern. This kind of engergy transmission pattern is called 'Radiation Pattern'. In some direction, the antenna transmit very strong energy and in some direction it transmit small amount of energy and in some direction it transmit the medium range of energy etc. In the air in which electromagnetic wave propagate varies. Depending on how we design the antenna, the direction Electrical energy flows through a predefined path in most case built in a copper cable or copper trace on PCB, but once the energy is converted into electromagnetic wave, it propagate into the air almost in every direction. The first step to understand/evaluate the performance of an antenna is to check the radiation pattern of the antenna. There are several indicators to represent the performance of an antenna as follows. Ii) I should be able to transmit the converted electromatic engergy as much as possible only to the direction that I want. I) I should convert Electrical Engergy into Electromagnetic Energy with as little loss as possible. There are two major criteria to evaluate Antenna Performance as follows. More technologies (e.g, cellular technology with various band/radio access technology, bluetooth, WiFi etc) within a device, it is getting tougher and tougher to design multiple antenna and put them into a smal space). As a mobile device (e.g, smart phone) gets more In most of the mobile devices you see these days, the antenna is embedded within the case or right on the PCB as shown below. In a relatively older type of mobile phone, you might have seen the antenna shown at the left side of the picture (whip antenna). Now in most of mobile communication devices, antenna are embedded in a small space. Just check how many of these you are familiar with. These are only some examples and there are a lot of other types as well. There are various types of antenna out there, some of the examples are shown below. Effective Isotropic Radiated Power/Equivalent Isotropic Radiated Power (EIRP)Īs you know, Antenna is a device which convert Electrical Engergy (Electrical Signal) into Electromagnetic Wave which is transmitted into space.Antenna is a pretty huge topic and it would be difficult to describe every aspects of Antenna in a single page, but I would try to give some big pictures of various aspects of antenna mainly for cellular application.
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