Am designing basestation antenna (GSM ~ 890 - 915 : 25 MHz bandwidth).
As of now, i finished the simulation of single patch, half wave resonating antenna. Got just 3 MHz impedence bandwidth at -10 dB return loss..
Gone through various techniques to increase B.W ( especially compact and broadband antennas book) and chosen the Microstrip line fed shorted patch geometry ( among techniques like aperture coupled, proximity coupled, adding chip resistor, stacked shorted patch, bowtie etc ), where height and width of the shorting plates affects the characteristics. I chosen this geometry to proceed with, as it looks simple than others ( correct me if it not so).
I have an idea of the how radiation occurs in simple patch antenna and how its equation derived ( w.r.to Antennas by balanis).
Now got stuck with the design of the Microstrip line fed shorted patch geometry, as it requires the design equations ( I think even with other geometry no design equations available)..
NOTE : I never thought to proceed with dual frequency antennas/ multiple patches, as it may increase the complexity for a beginner..
We can find the details of the Microstrip line fed shorted patch geometry from 'compact and broadband antennas' book, Page no :50..