Layer microstrip antenna patch is not the underlying motivation must be smaller than the upper radiating patch it? In order to get a better port match when I read a lot of papers and books are like this, but my simulation time, only the underlying motivation is greater than the upper layer of the patch radiating patch, what was done it? Seek to explain? ? ?
Layer microstrip patch antenna can increase the bandwidth. The gain will be a corresponding increase, the distance between the two patches more critical. As for size, I'm not a big difference in the simulation had about 1/2 wavelength. I have seen many top product placement generally smaller than the lower patch, there are individual to the contrary. Overall, the equivalent of the upper patch Yagi's director.
Microstrip patch antenna parasitic What is the role?
1, Document said parasitic patch may be formed in the antenna resonance circuit, two resonance points is equivalent to occur, when the resonance frequency of the antenna resonant circuit and the resonant frequency close to itself, can be considered to broaden the bandwidth of the antenna impedance . Further, a plurality of parasitic patches may be increased so as to broaden its Zhuo recursive impedance bandwidth. 2, I saw a document, it is a dual-band, parasitic patch can increase without affecting the high-frequency, low frequency to the left. 3, a master say is probably because the parasitic patch introduces a high-order mode, thereby increasing bandwidth. Reason by analogy from the waveguide that, if a single model, the cutoff frequency is relatively low, the introduction of multi-mode can increase bandwidth.
Seeking to increase bandwidth microstrip antenna array method?
1: a thick, low dielectric constant of the dielectric plate;
2: using electromagnetic coupling feed form;
3: loading the U-shaped slot and the like;
4: Add splitters, impedance conversion function;
5: formulation of micro impedance band transmission feed line.
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