Patent attributes
A power amplifier according to the present invention includes: an apparatus housing (10) having a hole (11) for maintenance formed therein; a transmission line unit (12) disposed in a location covered by the apparatus housing (10), a transmission line length of the transmission line unit being adjusted depending on a frequency band of an input signal; and an element (13) that requires no adjustment of a transmission line even when an adjustment of the transmission line unit (12) is required along with a change in the frequency band of the input signal. The transmission line unit (12) is disposed near a surface of an apparatus that is accessible from outside through the hole (11) for maintenance, and the element (13) that requires no adjustment of the transmission line is buried in a location within the apparatus housing that is inaccessible through the hole for maintenance (11).
