Use RFID coil antennas use?

RFID coil antennas suitable for a variety of applications. Products include 5.4GHz SMD reeled PCB mounting wideband antennas, Micro RWD MF modules for interface to antenna coils and antenna products for interfacing and two-way communications with low-frequency 134.2kHz Texas Instruments transponders and tags.

RFID reader. The reader is really cheap, and fits my porpoise, its recognized as a USB keyboard.

My Idea is to build a new antenna that can be fitted into a PVC tube and have a usb "reading rod". Basically I want to make a new coil with copper cable which area is a rectangle instead of a square.

The antenna coil and passive components form the tuned RLC circuit, which is designed to resonate at the 13.56 MHz carrier frequency and have a Q factor of 35-40. For the 125 kHz family of MicroRWD modules, the low Q antenna (700uH) has a relatively wide tolerance of inductance so the capacitor components are fixed and mounted on the RWD module itself pins AN1 and AN2 connect to an external antenna coil directly. For the 13.56 MHz MicroRWD modules, the antenna Q is higher and the inductance tolerance is narrow. For this reason the capacitor components are external to the module to allow fine-tuning and adjustment of the LC circuit as shown below. The external resistors are used to limit the antenna current and correct the antenna Q to 35-40 range.

N&R is a leading supplier of smart cards and RFDI tags for global system integrators and distributors. We offer a wide range of RFID tags with contact chip or contactless chip (LF, HF, UHF) ,such as ISO CR80 card, wristband, key fob, disc tag, laundry tag, tire tag ect. They are widely applied in different kinds of applications. For examples: access control, smart payment, loyalty system, assets tracking, identifications, time and attendance management.

http://www.nfcandrfid.com/products_info/ISO15693-RFID-coil-antenna-319941.html