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what are the deployment conditions of long range HiTag?

May I know how to fulfill the long range solution? are there requirements or special designs on reader side? such as pwr or the size/diameter of antenna?

my company is looking for a solution of livestock management, the demend includes: 1.long range: the distance between the Tag implanted and the reader is over 35cm. 2. the size(diameter is about 5cm) & weight of reader is small & light.  

Online authenticationRe: what are the deployment conditions of long range HiTag?

Hello @kevin9611 

Regarding your requirement of a reading distance >35 cm with a compact reader (~5 cm diameter):
Low-frequency (LF, 125/134 kHz, e.g., HITAG / ISO11784/11785) technology is based on inductive coupling. Due to fundamental physical limitations, it is generally not feasible to achieve such a long reading distance, especially with a small antenna size.
In practice, LF implantable tags typically operate at short ranges (a few centimeters up to ~20–30 cm under optimized conditions with large antennas). Therefore, your requirement (>35 cm with a ~5 cm reader) cannot be met with LF technology.
To achieve longer reading distances, we recommend considering UHF RFID (860–960 MHz), which can easily support reading distances of several meters even with compact reader antennas.
However, it is important to note that:

UHF RFID is not suitable for implantable applications, due to strong signal attenuation in animal tissue.
UHF solutions are typically used with ear tags or collars, rather than implanted transponders.

Conclusion:

If implantable tags are mandatory → LF technology (HITAG / ISO11784/85) must be used, but the reader design needs to be large (e.g., stick reader or gate antenna), not compact.
If long reading distance and compact reader size are mandatory → only UHF ear-tag-based solutions are feasible.