How about trying first mode rectangular squre patch, \lambda /2\times \lambda /2in affect my final project is about design dualband microstrip antenna at 144Mhz/430 MHz , for ground station nano satellite. but firstly i want design one by one this antenna.
i decide use microstrip coz from my lecture want it,.
do have any advise else for my design?
i have tried this one,but for freq 144Mhz has large size and my design must be less than 50 x 40 cm. but my UHF (430Mhz) has small size and has size less than 50x40 cm.and I am having trouble how to make dual band microstrip antenna with dimensions specification.How about trying first mode rectangular squre patch, \lambda /2\times \lambda /2
i don't have, but the material of the substrate is not too expensivehi
do u have limitation about the substrate material?
yes i has read this paper,but why pict of design doesn't appear? but this paper use full for my referencehi
see this paper it may be useful but i suggest u ,dont use microstrip
hi
i design an antenna with size 220*450mm and attach its S11 for u
in affect my final project is about design dualband microstrip antenna at 144Mhz/430 MHz , for ground station nano satellite. but firstly i want design one by one this antenna.
i decide use microstrip coz from my lecture want it,.
do have any advise else for my design?
yes thax u,i've got yours... it's very use full for my final project.... but may i ask again?? if i change the "feed" method to coax-probe, any suggestion where i should put this probe?hi
i will send it for i simulated with hfss 11 i hope it useful for u
Hello,
Do you need linear or circular polarisation? What radiation pattern do you want?
If linear, you can use "meandering" or "meander line" to reduce the physical length. Don't try to make this antenna on FR4 (with ground under it). The distance between the patch element and ground will be too small to get reasonable antenna efficiency. Meandering can be used for circular polarisation also, but you require more space and seperate feeds to create good circularity
You can make the antenna on FR4 PCB, but the PCB (single layer) should be elevated, so there will be lots of air between the PCB and the ground plane. Of course you can use rigid foam between the bottom side of the PCB and the metal ground plane for rigidity.
Other thing is you can make a structure that has good S11 at both 144 and 430 MHz, but this does not mean you have the correct radiation pattern for the 430 MHz part.
Some people use PIFA to reduce the size w.r.t. a regular patch (half wave resonating structure). However, the vertical part of the PIFA does change the radiation pattern significantly.
Hello,
PIFA gives other radiation pattern, so check whether this is accaptable. A half wave resonating patch with mostly air as dielectric has its main lobe in Z direction (when ground plane is in XY plane).
It is no problem to use FR4, as long as there is sufficient air between the PCB and the groundplane (so there is no ground plane on the PCB)
You can make a circular antenna with only one probe feed, but you may consider two orthogonal feeds that you derive from a (wilkinson) divider with a 90 degrees phase shift in one of the paths. The divider you can make on FR4 that is directly on the ground plane. From that PCB you can go vertically upwards to the radiating resonator (that is elevated).
Regarding dual-band. I would go for two seperate antennas in one case where you use some filtering to seperate (diplex filter function) 430 from 144 MHz. This enables you to design the antennas without significant interaction between the 430 and 144 MHz antenna.
Do you need to cover the full amateur bands (144..146, 430-440 MHz) or just a part. If you just need a single frequency in each band, the antenna can be small, but production tolerance becomes more important.
I would recommend you to discuss the options with you teacher.
hi riyadhe
i could reduce the frequencies of patch which i send u before many technique can be use for miniaturization of microstrip antenna
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