High frequency switch module and multi-layer substrate for high frequency switch module

A high frequency switch module comprising:

• an antenna port connected to an antenna;
• a plurality of transmission signal ports for receiving transmission signals at each of a plurality of frequency bands;
• a plurality of reception signal ports for outputting reception signals at each of a plurality of frequency bands;
• a high frequency switch including a semiconductor switch element and selectively connecting one signal port among the transmission signal ports and the reception signal ports to the antenna port;
• a plurality of low-pass filters each provided between the high frequency switch and each of the transmission signal ports and allowing a transmission signal inputted to each of the transmission signal ports to pass therethrough and intercepting a harmonic resulting from the transmission signal;
• and
• a plurality of phase adjusting lines for connecting the high frequency switch to the respective low-pass filters, wherein
• each of the phase adjusting lines adjusts a phase difference between a progressive wave of a harmonic of at least one frequency resulting from the transmission signal and produced at the high frequency switch and a reflected wave resulting from reflection of the progressive wave from one of the low-pass filters such that the phase difference falls within a range of 160 to 200 degrees inclusive at a point of the high frequency switch.

A multi-layer substrate used for a high frequency switch module, the high frequency switch module comprising:

• an antenna port connected to an antenna;
• a plurality of transmission signal ports for receiving transmission signals at each of a plurality of frequency bands;
• a plurality of reception signal ports for outputting reception signals at each of a plurality of frequency bands;
• a high frequency switch including a semiconductor switch element and selectively connecting one signal port among the transmission signal ports and the reception signal ports to the antenna port;
• a plurality of low-pass filters each provided between the high frequency switch and each of the transmission signal ports and allowing a transmission signal inputted to each of the transmission signal ports to pass therethrough and intercepting a harmonic resulting from the transmission signal;
• and
• a plurality of phase adjusting lines for connecting the high frequency switch to the respective low-pass filters, wherein:
• each of the phase adjusting lines adjusts a phase difference between a progressive wave of a harmonic of at least one frequency resulting from the transmission signal and produced at the high frequency switch and a reflected wave resulting from reflection of the progressive wave from one of the low-pass filters such that, at a point of the high frequency switch, a composite wave made up of the progressive wave and the reflected wave has power lower by at least 10 dB as compared to a case where the phase difference between the progressive wave and the reflected wave is zero;
• and
• the multi-layer substrate includes the antenna port, the transmission signal ports, the reception signal ports, the low-pass filters and the phase adjusting lines, and is used to complete the high frequency switch module by mounting the high frequency switch thereon.

A multi-layer substrate used for a high frequency switch module, the high frequency switch module comprising:

• an antenna port connected to an antenna;
• a plurality of transmission signal ports for receiving transmission signals at each of a plurality of frequency bands;
• a plurality of reception signal ports for outputting reception signals at each of a plurality of frequency bands;
• a high frequency switch including a semiconductor switch element and selectively connecting one signal port among the transmission signal ports and the reception signal ports to the antenna port;
• a plurality of low-pass filters each provided between the high frequency switch and each of the transmission signal ports and allowing a transmission signal inputted to each of the transmission signal ports to pass therethrough and intercepting a harmonic resulting from the transmission signal;
• and
• a plurality of phase adjusting lines for connecting the high frequency switch to the respective low-pass filters, wherein:
• each of the phase adjusting lines adjusts a phase difference between a progressive wave of a harmonic of at least one frequency resulting from the transmission signal and produced at the high frequency switch and a reflected wave resulting from reflection of the progressive wave from one of the low-pass filters such that the phase difference falls within a range of 160 to 200 degrees inclusive at a point of the high frequency switch;
• and
• the multi-layer substrate includes the antenna port, the transmission signal ports, the reception signal ports, the low-pass filters and the phase adjusting lines, and is used to complete the high frequency switch module by mounting the high frequency switch thereon.