IPhone 4 will not find my home network

I bought an iPhone 4 two weeks ago and I still cannot get it to detect my wireless home network.
I use a Time Capsule as my router, which is plugged directly into my modem via ethernet.
My Macbook can find my network/TC fine, and has done since I bought it.
My wireless settings are 802.11n only (5GHz) with wireless security set to WPA2 Personal.
I tried changing my settings and found that the only one that worked at connecting my iPhone was 802.11n(802.11b/g compatible), but it caused serious problems.
The connection between my TC and Macbook was severely reduced, and it could not detect my TC in Airport Utility, so it would not run the Time Machine back-up, and I was unable to get access to the settings to change them back.
I had to do a full reset on my TC(power down, hold reset button in and power on again) about six times before I could get it all working properly again and get access to the settings.
If I try to manually search for my network on my iPhone, it still will not find it.
It will find other peoples networks, but not mine.
And my current settings are the only ones that work perfectly with my Macbook and Time Capsule.
Any help?

My wireless settings are 802.11n only (5GHz) with wireless security set to WPA2 Personal.
Therein lies your problem.
Copied from this link.
http://www.apple.com/iphone/specs.html
+Cellular and wireless+
+UMTS/HSDPA/HSUPA (850, 900, 1900, 2100 MHz)+
+GSM/EDGE (850, 900, 1800, 1900 MHz)+
+*802.11b/g/n Wi-Fi (802.11n _2.4GHz only_)*+
+Bluetooth 2.1 + EDR wireless technology+
I also have a TC which supports simultaneous dual band. I have two bands or networks - one 5GHz for my MBP, Time Machine Backup, and Apple TV, and another set to 2.4 GHz for my iPhone. The name for one of the networks includes 5GHz with the name and the other doesn't, which is the one I connect my iPhone with.

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Open a web browser:
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192.168.1.1 (Mainly used for Asus, Linksys, etc) or 192.168.0.1 (D-link,Belkin)
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Hold down the windows key, then press R. This brings up the run box. In that box type "cmd" (without the quotes) and press enter. In the black box that pops up, type "ipconfig" (without quotes) then hit enter. Your default gateway is the IP address for your router. It will start with 192.168.....
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