Configurable filter for asymmetrical radio frequency communication

A mobile device comprising:

• an antenna configured to transmit and receive radio frequency signals;
• and
• a front end system coupled to the antenna and including a first filter configured to band-pass frequencies for a first transmit sub-band of a first communication band, a second filter configured to band-pass frequencies for a second transmit sub-band of the first communication band, a third filter configured to band-pass frequencies for a receive band of the first communication band, an antenna terminal, and at least one antenna switch module configured to connect the third filter and one of the first and second filters to the antenna terminal.

A radio frequency module comprising:

• a front end including a first filter configured to band-pass frequencies for a first transmit sub-band of a first communication band, a second filter configured to band-pass frequencies for a second transmit sub-band of the first communication band, a third filter configured to band-pass frequencies for a receive band of the first communication band, an antenna terminal, and at least one antenna switch module configured to connect the third filter and one of the first and second filters to the antenna terminal;
• and
• an antenna coupled to the antenna terminal, the front end and the antenna being enclosed within a common package.