![]() The antenna's radiation is also limited by its physical size, resulting in minimal antenna gain. Increasing Q-factors limits the ESA to narrowband operations that distort or reflect larger bandwidth transmission. Performance of ESAs are constrained by the rapid increase in the antennas’ Quality factor (Q-factor) which is inversely proportional to the product of the propagation constant, k, and the radius, a that minimally circumscribes the antenna structure. Limitations imposed by the physical size of platforms that are significantly smaller than the wavelength of operation are restricted to electrically small antennas (ESAs). The authors’ theoretical analysis agrees with our simulations and far-field measurements which show the FSK DAM antenna topology is capable of transmit powers up to −1 dBm given a 42 dBm of input RF power. The symmetry assists in removing coupling among transistor ports to effectively switch the transistors OFF and ON without regard to the input RF power. A frequency shift keyed (FSK) DAM antenna topology is proposed, which is capable of high-power transmission through a geometrically symmetrical switching circuitry integrating pairs of complementary GaN transistors. DAM utilises switching circuitry to directly modulate the antenna at its corresponding peak energy moments all while being synchronised to the input signal, yet previous iterations were susceptible to low transmit powers due to limitations in the switching network's power handling capability and tremendous coupling between transistor ports that results in an ambiguous switching signal at the gate. To overcome these limitations, a technique called direct antenna modulation (DAM), is incorporated with electrically small antennas to enable transmission of high-bandwidth signals through narrowband antennas. IET Generation, Transmission & DistributionĪntennas constrained to platforms that require miniaturisation, significantly smaller than the wavelength of the desired frequency, are inefficient radiators and limited to narrowband operations.IET Electrical Systems in Transportation.IET Cyber-Physical Systems: Theory & Applications.IET Collaborative Intelligent Manufacturing.CAAI Transactions on Intelligence Technology.Is there some reason why I cannot just hook the antenna output up to the antenna line, like splice it in, or would that affect the signal in an adverse way?I'm good at electronics, but I have not been to college yet, so i'm just lacking the knowledge that some of you guys have. If I buy the adapters, it will disable the diversity fuction of the radio, which I would prefer to keep, even though I probably would never notice the difference.Now - for the electrical engineers out there - what can I do about this?I guess my real question was that what does the modulator do to the signal. The radio constantly looks at both antennas and uses the one with the best reception.The problem is this: To hook up the FM modulator, the antenna connection actually goes through the modulatior itself. There are actually two separate antenna lines that go into the radio. I have a 97' Maxima with the Bose sound system.After a good bit of research and calling crutchfield, I found out that I will need a couple of adapters for the FM modulator to hook it into the antenna line.My car has two antennas, one regular one that sticks up on the outside, and another one in the rear window that looks like the defroster lines. I have read some posts here, and there seem to be some users that are real good at eletronics stuff.I just ordered an FM modulator to replace the tape adapter that I have playing music from my MP3 CD player (Rio SP250) to the car. I'm new here, I regular anandtech,, and forums.
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